fix: inline attachment detection and account-scoped export

- Treat MIME parts with Content-ID but no Content-Disposition as inline
  - Add account_ids filter to CLI export search to avoid pulling all accounts
  - Skip failed emails during export instead of aborting the entire batch

.gitignore

@@ -1,4 +1,6 @@
 /target
 .vscode
 .idea
-config.toml
+config.toml
+node_modules
+dedup_report.txt

Cargo.lock

@@ -293,7 +293,7 @@ checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
 
 [[package]]
 name = "bichon-admin"
-version = "1.2.0"
+version = "1.4.2"
 dependencies = [
  "bichon-core",
  "console",
@@ -301,7 +301,6 @@ dependencies = [
  "indicatif",
  "itertools",
  "memdb",
- "mimalloc",
  "native_db",
  "native_model",
  "serde",
@@ -312,7 +311,7 @@ dependencies = [
 
 [[package]]
 name = "bichon-cli"
-version = "1.2.0"
+version = "1.4.2"
 dependencies = [
  "base64 0.22.1",
  "bichon-core",
@@ -338,7 +337,7 @@ dependencies = [
 
 [[package]]
 name = "bichon-core"
-version = "1.2.0"
+version = "1.4.2"
 dependencies = [
  "async-imap",
  "base64 0.22.1",
@@ -346,6 +345,7 @@ dependencies = [
  "bytes 1.11.1",
  "chrono",
  "clap",
+ "cron",
  "dashmap",
  "deunicode",
  "email_address",
@@ -396,7 +396,7 @@ dependencies = [
 
 [[package]]
 name = "bichon-server"
-version = "1.2.0"
+version = "1.4.2"
 dependencies = [
  "bichon-core",
  "bichon-smtp",
@@ -404,7 +404,6 @@ dependencies = [
  "email_address",
  "governor",
  "http",
- "mimalloc",
  "poem",
  "poem-derive",
  "poem-openapi",
@@ -421,7 +420,7 @@ dependencies = [
 
 [[package]]
 name = "bichon-smtp"
-version = "1.2.0"
+version = "1.4.2"
 dependencies = [
  "base64 0.22.1",
  "bichon-core",
@@ -875,6 +874,17 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
 
+[[package]]
+name = "cron"
+version = "0.15.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5877d3fbf742507b66bc2a1945106bd30dd8504019d596901ddd012a4dd01740"
+dependencies = [
+ "chrono",
+ "once_cell",
+ "winnow 0.6.26",
+]
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.15"
@@ -1779,9 +1789,9 @@ checksum = "e9025058dae765dee5070ec375f591e2ba14638c63feff74f13805a72e523163"
 
 [[package]]
 name = "http"
-version = "1.4.0"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e3ba2a386d7f85a81f119ad7498ebe444d2e22c2af0b86b069416ace48b3311a"
+checksum = "8be7462df143984c4598a256ef469b251d7d7f9e271135073e78fc535414f3d0"
 dependencies = [
  "bytes 1.11.1",
  "itoa",
@@ -2252,15 +2262,6 @@ version = "0.2.185"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "52ff2c0fe9bc6cb6b14a0592c2ff4fa9ceb83eea9db979b0487cd054946a2b8f"
 
-[[package]]
-name = "libmimalloc-sys"
-version = "0.1.48"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2892ae4ea6fa2cb7acb0e236a6880d39523239cd9089de71d220910ccc806790"
-dependencies = [
- "cc",
-]
-
 [[package]]
 name = "linux-raw-sys"
 version = "0.12.1"
@@ -2465,15 +2466,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "mimalloc"
-version = "0.1.51"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ebca48a43116bc25f18a61360f1be98412f50cc218f5e52c823086b999a4a21a"
-dependencies = [
- "libmimalloc-sys",
-]
-
 [[package]]
 name = "mime"
 version = "0.3.17"
@@ -3931,9 +3923,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.149"
+version = "1.0.150"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "83fc039473c5595ace860d8c4fafa220ff474b3fc6bfdb4293327f1a37e94d86"
+checksum = "e8014e44b4736ed0538adeecded0fce2a272f22dc9578a7eb6b2d9993c74cfb9"
 dependencies = [
  "itoa",
  "memchr",
@@ -5611,6 +5603,15 @@ version = "0.53.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
 
+[[package]]
+name = "winnow"
+version = "0.6.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e90edd2ac1aa278a5c4599b1d89cf03074b610800f866d4026dc199d7929a28"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "winnow"
 version = "0.7.15"

Cargo.toml

@@ -6,23 +6,23 @@ members = [
     "crates/server",
     "crates/cli",
     "crates/admin",
+    "crates/smtp",
 ]
 
 resolver = "2"
 
 [workspace.package]
-version = "1.2.0"
+version = "1.4.2"
 edition = "2021"
 
 [workspace.dependencies]
 chrono = "0.4.44"
 clap = { version = "4.6.1", features = ["derive", "env"] }
-mimalloc = "0.1.51"
 memdb = { path = "crates/memdb" }
 itertools = "0.14.0"
 ring = { version = "0.17.14", features = ["std"] }
 serde = { version = "1.0.228", features = ["derive"] }
-serde_json = "1.0.149"
+serde_json = "1.0.150"
 tokio = { version = "1.52.3", features = ["full"] }
 tracing = "0.1.44"
 tracing-appender = "0.2.3"
@@ -38,7 +38,7 @@ reqwest = { version = "0.12.24", default-features = false, features = [
     "socks",
 ] }
 tokio-socks = "0.5.2"
-http = "1.4.0"
+http = "1.4.1"
 regex = "1.12.3"
 email_address = "0.2.9"
 futures = "0.3.32"

README.md

@@ -106,6 +106,10 @@
 - **Admin Tooling**: Password reset for locked-out admins. Non-destructive v0.3.7 to v1.0 data migration.
 - **API Token Management**: Create, list, and revoke long-lived API tokens for programmatic access.
 - **SOCKS5 Proxy Management**: Configure and manage proxy profiles for routing IMAP traffic per account.
+- **Scheduled Download**: Configure per-account download schedules using cron expressions. Run syncs at specific times or intervals — for example, nightly-only or business-hours-only archiving.
+- **Remote Content Blocking**: External images and tracking pixels embedded in emails are blocked by default. Users can selectively allow remote content to load on a per-message basis from the WebUI.
+- **Async Index Deduplication**: Duplicate detection in the search index is performed asynchronously, reducing write latency during high-throughput ingestion.
+
 
 ## Quick Start
 
@@ -445,7 +449,7 @@ Storage Layer         │
   └──────────────┘  └──────────────┘  └──────────────┘
 ```
 
-- **memdb**: Key-value metadata store. Houses accounts, users, roles, OAuth2 configs, proxy settings, and system configuration. All operations wrapped in `tokio::spawn_blocking`.
+- **memdb**: Key-value metadata store. Houses accounts, users, roles, OAuth2 configs, proxy settings, and system configuration. 
 - **Tantivy**: Full-text search indices with Zstd compression support. Two separate indices: envelope (email metadata + body text) and attachment (file metadata + extracted text). Batch-committed every 1,000 documents or 60 seconds.
 - **Fjall**: LZ4-compressed LSM tree key-value store. Two keyspaces — `email_keyspace` and `attachments_keyspace`. Content-hash addressed (BLAKE3) with insert-time deduplication. Values larger than 1 KB stored as separate files (KV separation).
 
@@ -481,6 +485,79 @@ Tantivy Fjall memdb
 - Manual sync via `POST /api/v1/accounts/:id/start-download`; cancel with `cancel-download`
 - Busy-check prevents overlapping manual and automatic syncs on the same account
 
+### Content Deduplication & Attachment Storage
+
+```
+                     ┌──────────────────────────────────────────┐
+                     │              Raw EML bytes               │
+                     └────────────────┬─────────────────────────┘
+                                      │
+                                      ▼
+                     ┌──────────────────────────────────────────┐
+                     │         BLAKE3 → email_content_hash      │
+                     └────────────────┬─────────────────────────┘
+                                      │
+                                      ▼
+                     ┌──────────────────────────────────────────┐
+                     │          MIME parse → Message            │
+                     └───────┬──────────────────┬──────────────┘
+                             │                  │
+                             │     ┌────────────┘
+                             │     │  detach attachments
+                             │     │
+                             ▼     ▼
+               ┌─────────────────┐   ┌──────────────────────────────┐
+               │  EMAIL BODY     │   │  EACH ATTACHMENT             │
+               │                 │   │                              │
+               │  Replace raw    │   │  BLAKE3(decoded content)     │
+               │  attachment     │   │  → attachment_content_hash   │
+               │  bytes with     │   │                              │
+               │  placeholder:   │   │  Store raw undecoded bytes   │
+               │                 │   │  in Fjall attachments_ks     │
+               │  <<BICHON_      │   │  (skip if hash exists)       │
+               │   DETACH_HASH:  │   │                              │
+               │   xxx>>         │   │  Extract text for indexing   │
+               │                 │   │  (PDF, DOCX, etc.)           │
+               └───────┬─────────┘   └──────────────┬───────────────┘
+                       │                            │
+                       ▼                            │
+               ┌──────────────────────────────┐     │
+               │  Stripped EML stored in      │     │
+               │  Fjall email_keyspace        │     │
+               │  keyed by email_content_hash │     │
+               │  (skip if hash exists)       │     │
+               └──────────────┬───────────────┘     │
+                              │                     │
+                              ▼                     ▼
+               ┌─────────────────────────────────────────────────┐
+               │           Tantivy full-text index               │
+               │  envelope index · attachment index              │
+               └─────────────────────────────────────────────────┘
+
+   ═══════════════════════════════════════════════════════════════
+
+   Dedup layers
+   ┌─────────────────────────────────────────────────────────────────┐
+   │ Fjall (insert-time)                                             │
+   │   contains_key(hash)? → skip : store with LZ4 compression       │
+   │                                                                 │
+   │ Tantivy (periodic, every 12 h)                                  │
+   │   Group by (account, mailbox, content_hash)                     │
+   │   Keep latest ingest_at → soft-delete older copies              │
+   │   Cascade-delete orphaned attachment index entries              │
+   └─────────────────────────────────────────────────────────────────┘
+
+   Reconstruction
+   ┌─────────────────────────────────────────────────────────────────┐
+   │ Fetch stripped EML by content_hash from Fjall                  │
+   │ Find <<BICHON_DETACH_HASH:xxx>> placeholders                    │
+   │ Replace each with raw attachment blob from Fjall                │
+   │ Result → byte-identical original EML                            │
+   └─────────────────────────────────────────────────────────────────┘
+```
+
+Every ingested email is hashed with BLAKE3. Attachments are detached from the MIME tree, hashed independently (decoded content), and stored as raw undecoded bytes in Fjall's `attachments_keyspace`. The email body is patched with hash-based placeholders and stored in `email_keyspace`. Both keyspaces check for existing hashes before writing — identical content is never stored twice, regardless of which account or folder it arrives in. A periodic index dedup task (every 12 hours) scans Tantivy for duplicate `(account, mailbox, content_hash)` tuples, keeps the most recently ingested copy, and cascade-deletes orphaned attachment entries so UID-based incremental sync remains accurate. The original EML reconstructs byte-for-byte by swapping placeholders back with their attachment blobs.
+
 ## Storage & Backup
 
 ### Data Directory Layout
@@ -528,21 +605,21 @@ The WebUI is available in **18 languages**:
 
 Language preference and UI theme are saved to your user profile and can be changed anytime from the WebUI settings.
 
-## Data Migration (v0.3.7 → v1.0)
+## Data Migration (v0.3.7 → v1.x)
 
-Bichon v1.0 introduced a redesigned storage architecture:
+Bichon v1.x introduced a redesigned storage architecture:
 
-| Layer | v0.3.7 (Legacy) | v1.0 |
-|-------|---------------|------|
-| **Index** | Tantivy (shared) | Tantivy (separate envelope + attachment indices) |
-| **Raw data** | Tantivy (inline) | Fjall (LZ4-compressed key-value store) |
-| **Metadata** | Tantivy (shared) | memdb (dedicated embedded DB) |
+| Layer | v0.3.7 (Legacy) | v1.x |
+| :--- | :--- | :--- |
+| **Index** | Tantivy (shared instance, no full attachments) | Tantivy (separate envelope + attachment indices) |
+| **Raw data** | Tantivy (inline, stored in another Tantivy instance) | Fjall (LZ4-compressed LSM-tree key-value store) |
+| **Metadata** | Native_DB (shared, disk-based DB powered by redb) | memdb (dedicated, in-house in-memory DB) |
 
-If you ran Bichon prior to v1.0, migrate your data:
+If you ran Bichon prior to v1.x, migrate your data:
 
 ```bash
 ./bichon-admin
-# Select "Migrate Legacy v0.3.7 Storage to v1.0"
+# Select "Migrate Legacy v0.3.7 Storage to v1.x"
 ```
 
 > [!NOTE]
@@ -580,8 +657,8 @@ No. Bichon is an **archiver**, not an email client. The optional SMTP server **r
 
 ### What hardware does Bichon need?
 
-- **Minimal:** 1 CPU core, 512 MB RAM
-- **Recommended (100+ accounts, 200+ GB):** 4+ cores, 2+ GB RAM
+- **Recommended:** 4+ CPU cores, 2+ GB RAM (sufficient for 10+ accounts and 200+ GB of archived data)
+- Filesystem: use a mainstream Linux filesystem such as **ext4** or **XFS**; avoid network / virtual filesystems (NFS, VirtIO-FS) for all data directories
 - Indices benefit from SSD storage; blob storage can use HDD
 
 ### How do I reset the admin password?
@@ -652,7 +729,6 @@ Feel free to open an [Issue](https://github.com/rustmailer/bichon/issues) or joi
 | **Frontend** | React 18, TypeScript, Vite 6, ShadCN UI, TanStack Router/Query/Table |
 | **Charts** | Recharts |
 | **i18n** | i18next (18 languages) |
-| **Allocator** | mimalloc |
 | **Container** | Ubuntu 24.04, Docker |
 
 ## License

config.toml

@@ -1,2 +1,2 @@
 base_url = "http://localhost:15630"
-api_token = "WuqNC0g8yNle7CVnxcvjUwjN"
+api_token = "eErI7WN3PtKeLwWAbIfSXCP6"

crates/admin/Cargo.toml

@@ -17,5 +17,4 @@ serde_json.workspace = true
 
 itertools.workspace = true
 snafu.workspace = true
-memdb.workspace = true
-mimalloc = "0.1.50"
+memdb.workspace = true

crates/admin/src/main.rs

@@ -18,7 +18,6 @@
 
 use console::style;
 use dialoguer::{theme::ColorfulTheme, Select};
-use mimalloc::MiMalloc;
 
 use crate::{migrate::handle_migration, reset::handle_reset_password};
 
@@ -26,8 +25,6 @@ pub mod meta;
 pub mod migrate;
 pub mod reset;
 
-#[global_allocator]
-static GLOBAL: MiMalloc = MiMalloc;
 
 fn main() {
     run_interactive();

crates/admin/src/meta.rs

@@ -246,7 +246,6 @@ impl From<AccountV3> for AccountModel {
             capabilities: value.capabilities,
             date_since: value.date_since,
             date_before: value.date_before,
-            folder_limit: value.folder_limit,
             download_folders: value.sync_folders,
             account_type: value.account_type,
             download_interval_min: value.sync_interval_min,
@@ -261,6 +260,7 @@ impl From<AccountV3> for AccountModel {
             imap_quota_window: None,
             imap_quota_bytes: None,
             auto_download_new_mailboxes: None,
+            download_schedule: None,
         }
     }
 }
@@ -660,6 +660,7 @@ impl From<MailBox> for bichon_core::cache::imap::mailbox::MailBox {
             unseen: value.unseen,
             uid_next: value.uid_next,
             uid_validity: value.uid_validity,
+            highest_uid: None,
         }
     }
 }

crates/cli/src/api/search.rs

@@ -10,13 +10,17 @@ use crate::BichonCliConfig;
 pub async fn search_messages(
     client: &Client,
     config: &BichonCliConfig,
+    account_ids: Option<std::collections::HashSet<u64>>,
     page: u64,
     page_size: u64,
 ) -> Option<DataPage<Envelope>> {
     let url = format!("{}/api/v1/search-messages", config.base_url);
 
     let payload = EmailSearchRequest {
-        filter: EmailSearchFilter::default(),
+        filter: EmailSearchFilter {
+            account_ids,
+            ..Default::default()
+        },
         page,
         page_size,
         sort_by: Some(SortBy::DATE),

crates/cli/src/export/mod.rs

@@ -146,20 +146,23 @@ pub async fn handle_account_export(
         let mut total_pages;
 
         loop {
-            if let Some(batch) = search_messages(&client, config, current_page, page_size).await {
+            let account_ids = Some(std::collections::HashSet::from([account.id]));
+            if let Some(batch) = search_messages(&client, config, account_ids, current_page, page_size).await {
                 total_pages = batch.total_pages.unwrap();
 
                 pb.set_message(format!("Page {}/{}", current_page, total_pages));
 
                 for envelope in batch.items {
                     let success =
-                        download_and_export_with_json_header(&client, config, envelope, &mut file)
+                        download_and_export_with_json_header(&client, config, envelope.clone(), &mut file)
                             .await;
 
                     if !success {
-                        pb.finish_with_message("Failed");
-                        eprintln!(" ✘ Failed to export an email. Aborting process...");
-                        return;
+                        eprintln!(
+                            " ✘ Failed to export email {}, skipping...",
+                            envelope.id
+                        );
+                        continue;
                     }
                     pb.inc(1);
                 }

crates/core/Cargo.toml

@@ -69,5 +69,6 @@ tokio-util.workspace = true
 whichlang = "0.1.1"
 deunicode = "1.6.2"
 scopeguard = "1.2.0"
+cron = "0.15"
 quick-xml = { version = "0.40.0", features = ["serialize"] }
 hickory-resolver = "0.26.0-alpha.1"

crates/core/src/account/migration.rs

@@ -80,7 +80,6 @@ pub struct Account {
     pub capabilities: Option<Vec<String>>,
     pub date_since: Option<DateSince>,
     pub date_before: Option<RelativeDate>,
-    pub folder_limit: Option<u32>,
     pub download_folders: Option<Vec<String>>,
     pub account_type: AccountType,
     pub download_interval_min: Option<i64>,
@@ -95,6 +94,7 @@ pub struct Account {
     pub imap_quota_bytes: Option<u64>,
     pub imap_quota_window: Option<QuotaWindow>,
     pub auto_download_new_mailboxes: Option<bool>,
+    pub download_schedule: Option<String>,
 }
 
 impl MemDbModel for Account {
@@ -124,7 +124,6 @@ impl Account {
             created_at: utc_now!(),
             updated_at: utc_now!(),
             use_proxy: request.use_proxy,
-            folder_limit: request.folder_limit,
             use_dangerous: request.use_dangerous,
             pgp_key: request.pgp_key,
             created_by: user_id,
@@ -133,6 +132,7 @@ impl Account {
             auto_download_new_mailboxes: request.auto_download_new_mailboxes,
             imap_quota_bytes: request.imap_quota_bytes,
             imap_quota_window: request.imap_quota_window,
+            download_schedule: request.download_schedule,
         })
     }
 
@@ -365,20 +365,10 @@ impl Account {
             }
         }
 
-        if let Some(folder_limit) = request.folder_limit {
-            new.folder_limit = Some(folder_limit);
-        }
-
         if let Some(account_name) = request.account_name {
             new.account_name = Some(account_name);
         }
 
-        if let Some(clear_folder_limit) = request.clear_folder_limit {
-            if clear_folder_limit {
-                new.folder_limit = None;
-            }
-        }
-
         if matches!(old.account_type, AccountType::IMAP) {
             if let Some(imap) = &request.imap {
                 if let Some(current_imap) = &mut new.imap {
@@ -439,6 +429,12 @@ impl Account {
         if let Some(auto_download_new_mailboxes) = request.auto_download_new_mailboxes {
             new.auto_download_new_mailboxes = Some(auto_download_new_mailboxes);
         }
+        if let Some(download_schedule) = request.download_schedule {
+            new.download_schedule = Some(download_schedule);
+        }
+        if request.clear_download_schedule == Some(true) {
+            new.download_schedule = None;
+        }
         new.updated_at = utc_now!();
         Ok(new)
     }

crates/core/src/account/payload.rs

@@ -16,6 +16,8 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::str::FromStr;
+
 use crate::account::entity::ImapConfig;
 use crate::account::migration::{AccountModel, AccountType, QuotaWindow};
 use crate::account::since::{DateSince, RelativeDate};
@@ -39,8 +41,6 @@ pub struct AccountCreateRequest {
     pub date_since: Option<DateSince>,
     pub date_before: Option<RelativeDate>,
     pub account_type: AccountType,
-    #[cfg_attr(feature = "web-api", oai(validator(minimum(value = "100"))))]
-    pub folder_limit: Option<u32>,
     #[cfg_attr(feature = "web-api", oai(validator(minimum(value = "10"))))]
     pub download_interval_min: Option<i64>,
     #[cfg_attr(
@@ -54,6 +54,7 @@ pub struct AccountCreateRequest {
     pub imap_quota_bytes: Option<u64>,
     pub imap_quota_window: Option<QuotaWindow>,
     pub auto_download_new_mailboxes: Option<bool>,
+    pub download_schedule: Option<String>,
 }
 
 impl AccountCreateRequest {
@@ -92,12 +93,15 @@ impl AccountCreateRequest {
                         ))
                     }
                 }
-                if self.download_interval_min.is_none() {
+                if self.download_interval_min.is_none() && self.download_schedule.is_none() {
                     return Err(raise_error!(
-                        "`sync_interval_min` is required for IMAP account type".into(),
+                        "`sync_interval_min` or `download_schedule` is required for IMAP account type".into(),
                         ErrorCode::InvalidParameter
                     ));
                 }
+                if let Some(ref schedule) = self.download_schedule {
+                    validate_cron_expression(schedule)?;
+                }
             }
             AccountType::NoSync => {}
         }
@@ -139,12 +143,6 @@ pub struct AccountUpdateRequest {
     pub date_since: Option<DateSince>,
     pub date_before: Option<RelativeDate>,
     pub clear_date_range: Option<bool>,
-    /// Max emails to sync for this folder.  
-    /// If not set, sync all emails.  
-    /// otherwise sync up to `n` most recent emails (min 10).
-    #[cfg_attr(feature = "web-api", oai(validator(minimum(value = "100"))))]
-    pub folder_limit: Option<u32>,
-    pub clear_folder_limit: Option<bool>,
     /// Configuration for selective folder (mailbox/label) synchronization
     ///
     /// - For IMAP/SMTP accounts:
@@ -178,6 +176,8 @@ pub struct AccountUpdateRequest {
     pub imap_quota_bytes: Option<u64>,
     pub imap_quota_window: Option<QuotaWindow>,
     pub auto_download_new_mailboxes: Option<bool>,
+    pub download_schedule: Option<String>,
+    pub clear_download_schedule: Option<bool>,
 }
 
 impl AccountUpdateRequest {
@@ -197,13 +197,6 @@ impl AccountUpdateRequest {
             ));
         }
 
-        if self.clear_folder_limit == Some(true) && self.folder_limit.is_some() {
-            return Err(raise_error!(
-                "clear_folder_limit cannot be combined with folder_limit".into(),
-                ErrorCode::InvalidParameter
-            ));
-        }
-
         if self.clear_date_range == Some(true)
             && (self.date_since.is_some() || self.date_before.is_some())
         {
@@ -230,11 +223,36 @@ impl AccountUpdateRequest {
                 ));
                 }
             }
+            if self.clear_download_schedule == Some(true) && self.download_schedule.is_some() {
+                return Err(raise_error!(
+                    "clear_download_schedule cannot be combined with download_schedule".into(),
+                    ErrorCode::InvalidParameter
+                ));
+            }
+            if let Some(ref schedule) = self.download_schedule {
+                validate_cron_expression(schedule)?;
+            }
         }
         Ok(())
     }
 }
 
+fn validate_cron_expression(expr: &str) -> BichonResult<()> {
+    if expr.trim().is_empty() {
+        return Err(raise_error!(
+            "download_schedule must not be empty".into(),
+            ErrorCode::InvalidParameter
+        ));
+    }
+    cron::Schedule::from_str(expr).map_err(|e| {
+        raise_error!(
+            format!("Invalid cron expression '{}': {}", expr, e),
+            ErrorCode::InvalidParameter
+        )
+    })?;
+    Ok(())
+}
+
 #[derive(Clone, Debug, Default, Eq, PartialEq, Deserialize, Serialize)]
 #[cfg_attr(feature = "web-api", derive(poem_openapi::Object))]
 
@@ -253,3 +271,34 @@ pub fn filter_accessible_accounts<'a>(
         .cloned()
         .collect()
 }
+
+#[cfg(test)]
+mod test {
+    use super::validate_cron_expression;
+
+    #[test]
+    fn valid_cron_expressions() {
+        assert!(validate_cron_expression("0 0 0 * * *").is_ok()); // daily at midnight
+        assert!(validate_cron_expression("0 */5 * * * *").is_ok()); // every 5 minutes
+        assert!(validate_cron_expression("0 0 12 * * 1-5").is_ok()); // weekdays at noon
+        assert!(validate_cron_expression("0 30 4 1 * *").is_ok()); // 1st of month at 04:30
+        assert!(validate_cron_expression("0 0 * * * *").is_ok()); // every hour
+    }
+
+    #[test]
+    fn invalid_cron_expression_too_few_fields() {
+        assert!(validate_cron_expression("0 0 * *").is_err());
+        assert!(validate_cron_expression("* * * * *").is_err()); // 5 fields, needs seconds
+    }
+
+    #[test]
+    fn invalid_cron_expression_empty() {
+        assert!(validate_cron_expression("").is_err());
+        assert!(validate_cron_expression("   ").is_err());
+    }
+
+    #[test]
+    fn invalid_cron_expression_garbage() {
+        assert!(validate_cron_expression("not a cron").is_err());
+    }
+}

crates/core/src/account/since.rs

@@ -364,4 +364,43 @@ mod test {
         };
         assert!(e.validate().is_err());
     }
+
+    // ── Sliding window tests ──────────────────────────────────────
+
+    #[test]
+    fn relative_date_calculate_returns_valid_format() {
+        let r = RelativeDate {
+            unit: Unit::Years,
+            value: 1,
+        };
+        let date_str = r.calculate_date().unwrap();
+        // Expect format like "26-May-2025"
+        assert!(date_str.len() > 5);
+        assert!(date_str.contains('-'));
+    }
+
+    #[test]
+    fn relative_date_one_year_ago_is_before_now() {
+        let r = RelativeDate {
+            unit: Unit::Years,
+            value: 1,
+        };
+        let date_str = r.calculate_date().unwrap();
+        let parsed = chrono::NaiveDate::parse_from_str(&date_str, "%d-%b-%Y").unwrap();
+        let today = chrono::Local::now().date_naive();
+        assert!(parsed < today, "1 year ago ({parsed}) should be before today ({today})");
+    }
+
+    #[test]
+    fn relative_date_one_day_ago_is_yesterday() {
+        let r = RelativeDate {
+            unit: Unit::Days,
+            value: 1,
+        };
+        let date_str = r.calculate_date().unwrap();
+        let parsed = chrono::NaiveDate::parse_from_str(&date_str, "%d-%b-%Y").unwrap();
+        let today = chrono::Local::now().date_naive();
+        let yesterday = today - chrono::Duration::days(1);
+        assert_eq!(parsed, yesterday, "1 day ago should be yesterday");
+    }
 }

crates/core/src/account/view.rs

@@ -40,7 +40,6 @@ pub struct AccountResp {
     pub capabilities: Option<Vec<String>>,
     pub date_since: Option<DateSince>,
     pub date_before: Option<RelativeDate>,
-    pub folder_limit: Option<u32>,
     pub download_folders: Option<Vec<String>>,
     pub account_type: AccountType,
     pub download_interval_min: Option<i64>,
@@ -57,6 +56,7 @@ pub struct AccountResp {
     pub imap_quota_bytes: Option<u64>,
     pub imap_quota_window: Option<QuotaWindow>,
     pub auto_download_new_mailboxes: Option<bool>,
+    pub download_schedule: Option<String>,
 }
 
 impl AccountResp {
@@ -72,7 +72,6 @@ impl AccountResp {
             capabilities: account.capabilities,
             date_since: account.date_since,
             date_before: account.date_before,
-            folder_limit: account.folder_limit,
             download_folders: account.download_folders,
             account_type: account.account_type,
             download_interval_min: account.download_interval_min,
@@ -93,6 +92,7 @@ impl AccountResp {
             imap_quota_bytes: account.imap_quota_bytes,
             imap_quota_window: account.imap_quota_window,
             auto_download_new_mailboxes: account.auto_download_new_mailboxes,
+            download_schedule: account.download_schedule,
         }
     }
 }

crates/core/src/autoconfig/client.rs

@@ -45,6 +45,10 @@ pub struct IncomingServer {
     #[serde(rename = "socketType")]
     pub socket_type: String,
     pub username: String,
+    /// Authentication method from the XML, e.g. "OAuth2", "password-cleartext",
+    /// "password-encrypted", "GSSAPI", "NTLM".  Absent in DNS SRV fallback.
+    #[serde(default)]
+    pub authentication: String,
 }
 
 #[derive(Debug, Clone, Default, PartialEq, Eq, Deserialize)]
@@ -137,6 +141,7 @@ async fn lookup_srv(domain: &str) -> Option<MailConfig> {
             port: imap_port,
             socket_type: "SSL".to_string(),
             username: "%EMAILADDRESS%".to_string(),
+            authentication: String::new(),
         }],
         outgoing: vec![OutgoingServer {
             protocol: "smtp".to_string(),
@@ -153,30 +158,37 @@ async fn lookup_srv(domain: &str) -> Option<MailConfig> {
 // ---------------------------------------------------------------------------
 
 /// Discover mail server configuration for a domain using the Thunderbird
-/// autoconfig protocol (ISPDB) and DNS SRV fallback.
+/// autoconfig protocol (ISPDB), DNS SRV, MX fallback, and finally guessing.
 ///
 /// Probe order:
 /// 1. `https://autoconfig.{domain}/mail/config-v1.1.xml`
-/// 2. `https://{domain}/.well-known/autoconfig/mail/config-v1.1.xml`
-/// 3. DNS SRV records (`_imaps._tcp` / `_submission._tcp`)
-/// 4. Thunderbird central ISPDB (`https://autoconfig.thunderbird.net/v1.1/{domain}`)
+/// 2. `http://autoconfig.{domain}/mail/config-v1.1.xml`
+/// 3. `https://{domain}/.well-known/autoconfig/mail/config-v1.1.xml`
+/// 4. `http://{domain}/.well-known/autoconfig/mail/config-v1.1.xml`
+/// 5. DNS SRV records (`_imaps._tcp` / `_submission._tcp`)
+/// 6. Thunderbird central ISPDB (`https://autoconfig.thunderbird.net/v1.1/{domain}`)
+/// 7. MX lookup → ISPDB for MX domain
+/// 8. MX lookup → ISP autoconfig for MX domain
+/// 9. GuessConfig — probe common hostnames + ports
 pub async fn fetch(domain: &str) -> BichonResult<MailConfig> {
     let client = Client::builder()
         .timeout(std::time::Duration::from_secs(10))
         .build()
         .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::InternalError))?;
 
-    // 1. Try autoconfig subdomain
-    if let Some(config) = fetch_xml(
-        &client,
-        &format!("https://autoconfig.{domain}/mail/config-v1.1.xml"),
-    )
-    .await
+    // ── ISP autoconfig (HTTPS, then HTTP) ──────────────────────────
+    if let Some(config) =
+        fetch_xml(&client, &format!("https://autoconfig.{domain}/mail/config-v1.1.xml")).await
+    {
+        return Ok(config);
+    }
+    if let Some(config) =
+        fetch_xml(&client, &format!("http://autoconfig.{domain}/mail/config-v1.1.xml")).await
     {
         return Ok(config);
     }
 
-    // 2. Try well-known path
+    // ── Well-known path (HTTPS, then HTTP) ─────────────────────────
     if let Some(config) = fetch_xml(
         &client,
         &format!("https://{domain}/.well-known/autoconfig/mail/config-v1.1.xml"),
@@ -185,28 +197,100 @@ pub async fn fetch(domain: &str) -> BichonResult<MailConfig> {
     {
         return Ok(config);
     }
+    if let Some(config) = fetch_xml(
+        &client,
+        &format!("http://{domain}/.well-known/autoconfig/mail/config-v1.1.xml"),
+    )
+    .await
+    {
+        return Ok(config);
+    }
 
-    // 3. Try DNS SRV records
+    // ── DNS SRV records ────────────────────────────────────────────
     if let Some(config) = lookup_srv(domain).await {
         return Ok(config);
     }
 
-    // 4. Fall back to Thunderbird central database
-    if let Some(config) = fetch_xml(
-        &client,
-        &format!("https://autoconfig.thunderbird.net/v1.1/{domain}"),
-    )
-    .await
+    // ── Thunderbird central ISPDB ──────────────────────────────────
+    if let Some(config) =
+        fetch_xml(&client, &format!("https://autoconfig.thunderbird.net/v1.1/{domain}")).await
     {
         return Ok(config);
     }
 
+    // ── MX fallback ────────────────────────────────────────────────
+    if let Some(config) = fetch_for_mx(&client, domain).await {
+        return Ok(config);
+    }
+
+    // ── GuessConfig ────────────────────────────────────────────────
+    if let Some(config) = crate::autoconfig::guess::guess_config(domain).await {
+        return Ok(config);
+    }
+
     Err(raise_error!(
         format!("No autoconfig found for domain: {domain}"),
         ErrorCode::InternalError
     ))
 }
 
+/// DNS MX lookup → retry ISPDB and ISP autoconfig for the MX domain.
+///
+/// Many self-hosted domains have their MX pointed at Google, Microsoft, etc.
+/// The MX domain's ISPDB entry covers the original domain.
+async fn fetch_for_mx(client: &Client, domain: &str) -> Option<MailConfig> {
+    let mx_domain = lookup_mx_domain(domain).await?;
+    if mx_domain == domain.to_ascii_lowercase() {
+        return None; // same domain, already tried above
+    }
+
+    // Try ISPDB for the MX domain
+    if let Some(config) =
+        fetch_xml(client, &format!("https://autoconfig.thunderbird.net/v1.1/{mx_domain}")).await
+    {
+        return Some(config);
+    }
+
+    // Try ISP autoconfig for the MX domain (HTTPS then HTTP)
+    if let Some(config) =
+        fetch_xml(client, &format!("https://autoconfig.{mx_domain}/mail/config-v1.1.xml")).await
+    {
+        return Some(config);
+    }
+    if let Some(config) =
+        fetch_xml(client, &format!("http://autoconfig.{mx_domain}/mail/config-v1.1.xml")).await
+    {
+        return Some(config);
+    }
+
+    None
+}
+
+/// DNS MX lookup → extract the second-level domain of the first MX hostname.
+async fn lookup_mx_domain(domain: &str) -> Option<String> {
+    let resolver = TokioResolver::builder(TokioConnectionProvider::default())
+        .ok()?
+        .build();
+    let lookup = resolver.mx_lookup(domain).await.ok()?;
+    let record = lookup.iter().next()?;
+    let mx_host = record.to_string().trim_end_matches('.').to_string();
+
+    // Extract a reasonable base domain from the MX hostname.
+    // E.g., "aspmx.l.google.com" → "google.com"
+    //       "company.mail.protection.outlook.com" → "outlook.com"
+    extract_base_domain(&mx_host)
+}
+
+/// Extract the top two labels from a hostname as a rough base domain.
+fn extract_base_domain(host: &str) -> Option<String> {
+    let parts: Vec<&str> = host.split('.').collect();
+    if parts.len() >= 2 {
+        Some(parts[parts.len() - 2..].join("."))
+    } else {
+        None
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

crates/core/src/autoconfig/guess.rs

@@ -0,0 +1,105 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+use crate::account::entity::Encryption;
+use crate::autoconfig::client::{IncomingServer, MailConfig};
+use crate::imap::client::Client;
+use tracing::{debug, info};
+
+/// A single host:port:encryption combination to probe.
+struct Guess {
+    hostname: String,
+    port: u16,
+    encryption: Encryption,
+    socket_type: &'static str,
+}
+
+/// Generate candidates in the same order Thunderbird uses:
+/// 1. imap.{domain}          — most common
+/// 2. mail.{domain}          — fallback
+/// 3. {domain}               — bare domain (rare)
+fn make_guesses(domain: &str) -> Vec<Guess> {
+    let hosts = [
+        format!("imap.{domain}"),
+        format!("mail.{domain}"),
+        domain.to_string(),
+    ];
+
+    let mut guesses = Vec::with_capacity(hosts.len() * 2);
+    for host in &hosts {
+        guesses.push(Guess {
+            hostname: host.clone(),
+            port: 993,
+            encryption: Encryption::Ssl,
+            socket_type: "SSL",
+        });
+        guesses.push(Guess {
+            hostname: host.clone(),
+            port: 143,
+            encryption: Encryption::StartTls,
+            socket_type: "STARTTLS",
+        });
+    }
+    guesses
+}
+
+/// Try to open a connection, read the IMAP banner, and close.
+/// Returns `true` if the server responds with an IMAP greeting.
+async fn probe(hostname: &str, port: u16, encryption: &Encryption) -> bool {
+    match Client::connection(hostname, encryption, port, None, true).await {
+        Ok(_) => {
+            debug!("GuessConfig probe succeeded: {hostname}:{port} ({encryption:?})");
+            true
+        }
+        Err(e) => {
+            debug!("GuessConfig probe failed for {hostname}:{port}: {e:?}");
+            false
+        }
+    }
+}
+
+/// Thunderbird-style guessing: try common hostnames and ports, probing
+/// each with a real TCP connection.
+///
+/// Returns the first working `MailConfig`, or `None` if nothing works.
+pub async fn guess_config(domain: &str) -> Option<MailConfig> {
+    let guesses = make_guesses(domain);
+    info!("GuessConfig: trying {} candidates for {domain}", guesses.len());
+
+    for g in &guesses {
+        if probe(&g.hostname, g.port, &g.encryption).await {
+            info!(
+                "GuessConfig: found working IMAP at {}:{} ({})",
+                g.hostname, g.port, g.socket_type
+            );
+            return Some(MailConfig {
+                incoming: vec![IncomingServer {
+                    protocol: "imap".to_string(),
+                    hostname: g.hostname.clone(),
+                    port: g.port,
+                    socket_type: g.socket_type.to_string(),
+                    username: "%EMAILADDRESS%".to_string(),
+                    authentication: String::new(),
+                }],
+                outgoing: vec![],
+            });
+        }
+    }
+
+    None
+}

crates/core/src/autoconfig/load.rs

@@ -19,6 +19,7 @@
 use crate::account::entity::Encryption;
 use crate::autoconfig::client::{self, MailConfig};
 use crate::autoconfig::entity::{MailServerConfig, ServerConfig};
+use crate::autoconfig::oauth2_providers::lookup_oauth2;
 use crate::autoconfig::CachedMailSettings;
 use crate::error::code::ErrorCode;
 use crate::error::BichonResult;
@@ -54,9 +55,17 @@ pub(crate) fn mail_config_to_server_config(config: &MailConfig) -> Option<MailSe
         }
     };
 
+    // Detect OAuth2 support: the XML <authentication> field and a known
+    // hostname → issuer mapping determine whether the provider supports OAuth2.
+    let oauth2 = if imap.authentication.eq_ignore_ascii_case("OAuth2") {
+        lookup_oauth2(&imap.hostname)
+    } else {
+        None
+    };
+
     Some(MailServerConfig {
         imap: ServerConfig::new(imap.hostname.clone(), port, encryption),
-        oauth2: None,
+        oauth2,
     })
 }
 

crates/core/src/autoconfig/mod.rs

@@ -24,7 +24,9 @@ use serde::{Deserialize, Serialize};
 
 pub mod client;
 pub mod entity;
+pub mod guess;
 pub mod load;
+mod oauth2_providers;
 #[cfg(test)]
 mod tests;
 

crates/core/src/autoconfig/oauth2_providers.rs

@@ -0,0 +1,151 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+use crate::autoconfig::entity::OAuth2Config;
+
+/// Per-provider OAuth2 metadata, mirroring Thunderbird's `OAuth2Providers.sys.mjs`.
+///
+/// Each entry maps one or more IMAP hostname suffixes to a well-known OIDC issuer
+/// and the IMAP-specific OAuth2 scopes.
+struct Provider {
+    /// Suffixes matched case-insensitively against the end of the IMAP hostname.
+    host_suffixes: &'static [&'static str],
+    /// The OIDC issuer URL used by the provider.
+    issuer: &'static str,
+    /// OAuth2 scope(s) required for IMAP access.
+    scopes: &'static [&'static str],
+}
+
+const PROVIDERS: &[Provider] = &[
+    // Google
+    Provider {
+        host_suffixes: &["imap.gmail.com", ".gmail.com", ".googlemail.com"],
+        issuer: "https://accounts.google.com",
+        scopes: &["https://mail.google.com/"],
+    },
+    // Microsoft (Outlook / Office 365 / Hotmail / Live)
+    Provider {
+        host_suffixes: &[
+            "outlook.office365.com",
+            ".outlook.com",
+            ".hotmail.com",
+            ".live.com",
+            ".office365.com",
+        ],
+        issuer: "https://login.microsoftonline.com/common/v2.0",
+        scopes: &[
+            "https://outlook.office365.com/IMAP.AccessAsUser.All",
+            "offline_access",
+        ],
+    },
+    // Yahoo / AOL / ATT / Verizon
+    Provider {
+        host_suffixes: &[
+            "imap.mail.yahoo.com",
+            ".yahoo.com",
+            ".yahoodns.net",
+            ".aol.com",
+            "imap.aol.com",
+        ],
+        issuer: "https://login.yahoo.com",
+        scopes: &["mail-w"],
+    },
+    // Yandex
+    Provider {
+        host_suffixes: &["imap.yandex.ru", "imap.yandex.com", ".yandex.ru"],
+        issuer: "https://oauth.yandex.com",
+        scopes: &["imap:all"],
+    },
+    // Mail.ru
+    Provider {
+        host_suffixes: &["imap.mail.ru", ".mail.ru", ".bk.ru", ".list.ru", ".inbox.ru"],
+        issuer: "https://o2.mail.ru",
+        scopes: &["imap"],
+    },
+    // Fastmail
+    Provider {
+        host_suffixes: &["imap.fastmail.com", ".fastmail.com"],
+        issuer: "https://www.fastmail.com",
+        scopes: &[
+            "https://www.fastmail.com/dev/imap",
+            "offline_access",
+        ],
+    },
+    // Comcast
+    Provider {
+        host_suffixes: &["imap.comcast.net", ".comcast.net"],
+        issuer: "https://oauth.xfinity.com",
+        scopes: &["https://email.comcast.net/"],
+    },
+];
+
+/// Try to find an OAuth2 provider that matches the given IMAP hostname.
+///
+/// Matching is case-insensitive and done by suffix: a hostname "imap.gmail.com"
+/// matches the suffix ".gmail.com".
+pub fn lookup_oauth2(hostname: &str) -> Option<OAuth2Config> {
+    let host = hostname.to_ascii_lowercase();
+    for provider in PROVIDERS {
+        if provider
+            .host_suffixes
+            .iter()
+            .any(|suffix| host.ends_with(&suffix.to_ascii_lowercase()))
+        {
+            return Some(OAuth2Config {
+                issuer: provider.issuer.to_string(),
+                scope: provider.scopes.iter().map(|s| s.to_string()).collect(),
+                auth_url: String::new(),
+                token_url: String::new(),
+            });
+        }
+    }
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_known_providers() {
+        let cases = [
+            ("imap.gmail.com", Some("https://accounts.google.com")),
+            ("imap.gmail.com", Some("https://accounts.google.com")),
+            ("outlook.office365.com", Some("https://login.microsoftonline.com/common/v2.0")),
+            ("imap.mail.yahoo.com", Some("https://login.yahoo.com")),
+            ("imap.aol.com", Some("https://login.yahoo.com")),
+            ("imap.yandex.ru", Some("https://oauth.yandex.com")),
+            ("imap.mail.ru", Some("https://o2.mail.ru")),
+            ("imap.fastmail.com", Some("https://www.fastmail.com")),
+            ("imap.comcast.net", Some("https://oauth.xfinity.com")),
+        ];
+        for (hostname, expected_issuer) in &cases {
+            let result = lookup_oauth2(hostname);
+            assert_eq!(
+                result.map(|c| c.issuer),
+                expected_issuer.map(|s| s.to_string()),
+                "failed for hostname: {hostname}"
+            );
+        }
+    }
+
+    #[test]
+    fn test_unknown_provider() {
+        assert!(lookup_oauth2("mail.my-company.example").is_none());
+    }
+}

crates/core/src/autoconfig/tests.rs

@@ -195,6 +195,7 @@ fn make_imap_server(host: &str, port: u16, socket_type: &str) -> IncomingServer
         port,
         socket_type: socket_type.to_string(),
         username: "%EMAILADDRESS%".to_string(),
+        authentication: String::new(),
     }
 }
 
@@ -241,6 +242,7 @@ fn convert_no_imap_only_pop3() {
             port: 995,
             socket_type: "SSL".to_string(),
             username: "%EMAILADDRESS%".to_string(),
+            authentication: String::new(),
         }],
         outgoing: vec![],
     };
@@ -266,6 +268,7 @@ fn convert_picks_imap_over_pop3() {
                 port: 995,
                 socket_type: "SSL".to_string(),
                 username: "%EMAILADDRESS%".to_string(),
+                authentication: String::new(),
             },
             make_imap_server("imap.example.com", 993, "SSL"),
         ],
@@ -284,6 +287,7 @@ fn convert_imaps_protocol_variant() {
             port: 993,
             socket_type: "SSL".to_string(),
             username: "%EMAILADDRESS%".to_string(),
+            authentication: String::new(),
         }],
         outgoing: vec![],
     };
@@ -300,9 +304,65 @@ fn convert_case_insensitive_protocol() {
             port: 143,
             socket_type: "STARTTLS".to_string(),
             username: "%EMAILADDRESS%".to_string(),
+            authentication: String::new(),
         }],
         outgoing: vec![],
     };
     let result = mail_config_to_server_config(&config).expect("should recognize 'IMAP'");
     assert_eq!(result.imap.host, "imap.example.com");
 }
+
+#[test]
+fn convert_gmail_oauth2() {
+    let config = MailConfig {
+        incoming: vec![IncomingServer {
+            protocol: "imap".to_string(),
+            hostname: "imap.gmail.com".to_string(),
+            port: 993,
+            socket_type: "SSL".to_string(),
+            username: "%EMAILADDRESS%".to_string(),
+            authentication: "OAuth2".to_string(),
+        }],
+        outgoing: vec![],
+    };
+    let result = mail_config_to_server_config(&config).expect("should convert");
+    let oauth2 = result.oauth2.expect("Gmail should have OAuth2");
+    assert_eq!(oauth2.issuer, "https://accounts.google.com");
+    assert!(oauth2.scope.contains(&"https://mail.google.com/".to_string()));
+}
+
+#[test]
+fn convert_outlook_oauth2() {
+    let config = MailConfig {
+        incoming: vec![IncomingServer {
+            protocol: "imap".to_string(),
+            hostname: "outlook.office365.com".to_string(),
+            port: 993,
+            socket_type: "SSL".to_string(),
+            username: "%EMAILADDRESS%".to_string(),
+            authentication: "OAuth2".to_string(),
+        }],
+        outgoing: vec![],
+    };
+    let result = mail_config_to_server_config(&config).expect("should convert");
+    let oauth2 = result.oauth2.expect("Outlook should have OAuth2");
+    assert!(oauth2.issuer.contains("microsoftonline"));
+}
+
+#[test]
+fn convert_unknown_host_no_oauth2() {
+    // OAuth2 auth flag on an unknown hostname → no OAuth2 returned
+    let config = MailConfig {
+        incoming: vec![IncomingServer {
+            protocol: "imap".to_string(),
+            hostname: "mail.random-isp.example".to_string(),
+            port: 993,
+            socket_type: "SSL".to_string(),
+            username: "%EMAILADDRESS%".to_string(),
+            authentication: "OAuth2".to_string(),
+        }],
+        outgoing: vec![],
+    };
+    let result = mail_config_to_server_config(&config).expect("should convert");
+    assert!(result.oauth2.is_none(), "unknown hostname → no OAuth2 mapping");
+}

crates/core/src/cache/imap/download/download_type.rs

@@ -16,6 +16,11 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::str::FromStr;
+
+use chrono::{DateTime, Local, TimeZone, Utc};
+use cron::Schedule;
+
 use crate::{
     utc_now,
     {
@@ -48,11 +53,20 @@ pub async fn decide_next_download_task(
 
     let should_start = match trigger_type {
         TriggerType::Manual => true,
-        TriggerType::Scheduled => should_trigger_next_download(
-            state.last_trigger_at,
-            state.last_finished_at.unwrap_or(0),
-            account.download_interval_min.unwrap_or(60),
-        ),
+        TriggerType::Scheduled => {
+            let now = utc_now!();
+            let cooldown_ok = now - state.last_finished_at.unwrap_or(0) > 60 * 1000;
+            if !cooldown_ok {
+                false
+            } else if let Some(ref schedule) = account.download_schedule {
+                should_trigger_scheduled(schedule, state.last_trigger_at)
+            } else {
+                should_trigger_next_download(
+                    state.last_trigger_at,
+                    account.download_interval_min.unwrap_or(60),
+                )
+            }
+        }
     };
 
     if should_start {
@@ -63,11 +77,80 @@ pub async fn decide_next_download_task(
     }
 }
 
-fn should_trigger_next_download(
-    last_trigger_at: i64,
-    last_finished_at: i64,
-    sync_interval_min: i64,
-) -> bool {
+fn should_trigger_next_download(last_trigger_at: i64, sync_interval_min: i64) -> bool {
     let now = utc_now!();
-    now - last_trigger_at > (sync_interval_min * 60 * 1000) && now - last_finished_at > 60 * 1000
+    now - last_trigger_at > (sync_interval_min * 60 * 1000)
+}
+
+fn should_trigger_scheduled(schedule_str: &str, last_trigger_at: i64) -> bool {
+    let schedule = match Schedule::from_str(schedule_str) {
+        Ok(s) => s,
+        Err(e) => {
+            tracing::warn!(
+                "Invalid cron expression '{}', falling back to no trigger: {}",
+                schedule_str,
+                e
+            );
+            return false;
+        }
+    };
+    // last_trigger_at is a UTC millis timestamp; convert to server local time
+    let last_utc = match Utc.timestamp_millis_opt(last_trigger_at) {
+        chrono::LocalResult::Single(dt) => dt,
+        _ => {
+            tracing::warn!("Invalid last_trigger_at timestamp: {}", last_trigger_at);
+            return false;
+        }
+    };
+    let last_dt: DateTime<Local> = last_utc.with_timezone(&Local);
+    let now = Local::now();
+    schedule
+        .after(&last_dt)
+        .next()
+        .map_or(false, |next| next <= now)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn cron_every_minute_triggers_after_60s() {
+        // "0 * * * * *" = every minute at second 0. last_trigger 90s ago → should trigger
+        let now = Local::now();
+        let last_trigger = now.timestamp_millis() - 90_000;
+        assert!(should_trigger_scheduled("0 * * * * *", last_trigger));
+    }
+
+    #[test]
+    fn cron_daily_midnight_triggers_when_missed() {
+        // "0 0 0 * * *" = daily at midnight
+        // last_trigger was 25 hours ago → should trigger (we missed midnight)
+        let now = Local::now();
+        let last_trigger = now.timestamp_millis() - 25 * 60 * 60 * 1000;
+        assert!(should_trigger_scheduled("0 0 0 * * *", last_trigger));
+    }
+
+    #[test]
+    fn cron_daily_midnight_no_trigger_if_already_fired() {
+        // "0 0 0 * * *" = daily at midnight
+        // last_trigger was 1 minute ago → should NOT trigger
+        let now = Local::now();
+        let last_trigger = now.timestamp_millis() - 60_000;
+        assert!(!should_trigger_scheduled("0 0 0 * * *", last_trigger));
+    }
+
+    #[test]
+    fn invalid_cron_returns_false() {
+        assert!(!should_trigger_scheduled("invalid cron expression", 0));
+    }
+
+    #[test]
+    fn cron_every_hour_triggers() {
+        // "0 0 * * * *" = every hour at minute 0, second 0
+        // last_trigger was 61 minutes ago → should trigger
+        let now = Local::now();
+        let last_trigger = now.timestamp_millis() - 61 * 60 * 1000;
+        assert!(should_trigger_scheduled("0 0 * * * *", last_trigger));
+    }
 }

crates/core/src/cache/imap/download/flow.rs

@@ -32,7 +32,9 @@ use crate::{
             SEMAPHORE,
         },
         error::{code::ErrorCode, BichonResult},
-        imap::executor::ImapExecutor,
+        imap::executor::{
+            generate_uid_sequence_hashset, ImapExecutor, DEFAULT_BATCH_SIZE,
+        },
         store::tantivy::envelope::ENVELOPE_MANAGER,
     },
 };
@@ -40,7 +42,6 @@ use std::time::Instant;
 use tokio_util::sync::CancellationToken;
 use tracing::{debug, error, info, warn};
 
-pub const DEFAULT_BATCH_SIZE: u32 = 30;
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub enum FetchDirection {
@@ -54,7 +55,7 @@ pub async fn fetch_and_save_by_date(
     mailbox: &MailBox,
     direction: FetchDirection,
     token: CancellationToken,
-) -> BichonResult<()> {
+) -> BichonResult<Option<u32>> {
     let account_id = account.id;
     let mut session = match ImapExecutor::create_connection(account_id).await {
         Ok(session) => session,
@@ -108,32 +109,18 @@ pub async fn fetch_and_save_by_date(
             FolderStatus::Success,
             None,
         )?;
-        return Ok(());
+        return Ok(None);
     }
 
-    let folder_limit = account.folder_limit;
     // sort small -> bigger
     let mut uid_vec: Vec<u32> = uid_list.into_iter().collect();
     uid_vec.sort();
 
-    if let Some(limit) = folder_limit {
-        let limit = limit.max(100) as usize;
-        if len > limit {
-            uid_vec = match direction {
-                FetchDirection::Since => uid_vec.split_off(len - limit),
-                FetchDirection::Before => {
-                    uid_vec.truncate(limit);
-                    uid_vec
-                }
-            };
-        }
-    }
-
+    let max_uid = uid_vec.last().copied();
     let planned = uid_vec.len() as u64;
     let uid_batches = generate_uid_sequence_hashset(
         uid_vec,
         account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE) as usize,
-        false,
     );
     DownloadState::update_folder_progress(
         account_id,
@@ -212,14 +199,16 @@ pub async fn fetch_and_save_by_date(
         )?;
     }
     session.logout().await.ok();
-    Ok(())
+    Ok(max_uid)
 }
 
+/// Fetches all messages from a mailbox.
+/// Returns `Ok(Some(max_uid))` with the highest UID stored, or `Ok(None)` if empty.
 pub async fn fetch_and_save_full_mailbox(
     account: &AccountModel,
     mailbox: &MailBox,
     token: CancellationToken,
-) -> BichonResult<()> {
+) -> BichonResult<Option<u32>> {
     let mailbox_id = mailbox.id;
     let account_id = account.id;
 
@@ -262,33 +251,17 @@ pub async fn fetch_and_save_full_mailbox(
         }
     };
 
-    let folder_limit = account.folder_limit;
-    let total_to_fetch = match folder_limit {
-        Some(limit) if (limit as u64) < total => {
-            let limit64 = limit as u64;
-            total.min(limit64.max(100))
-        }
-        _ => total,
-    };
-
-    let page_size = if let Some(limit) = folder_limit {
-        limit
-            .max(100)
-            .min(account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE))
-    } else {
-        account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE)
-    };
-
-    let total_batches = total_to_fetch.div_ceil(page_size as u64);
-    let desc = folder_limit.is_some();
+    let page_size = account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE);
+    let total_batches = total.div_ceil(page_size as u64);
 
     info!(
-        "Starting full mailbox download for '{}', total={}, limit={:?}, batches={}, desc={}",
-        mailbox.name, total, folder_limit, total_batches, desc
+        "Starting full mailbox download for '{}', total={}, batches={}",
+        mailbox.name, total, total_batches
     );
 
     let mut current_processed = 0u64;
     let mut has_error_or_cancel = false;
+    let mut max_uid: Option<u32> = None;
 
     for page in 1..=total_batches {
         if token.is_cancelled() {
@@ -300,7 +273,7 @@ pub async fn fetch_and_save_full_mailbox(
             DownloadState::update_folder_progress(
                 account_id,
                 mailbox.name.clone(),
-                total_to_fetch,
+                total,
                 current_processed,
                 FolderStatus::Cancelled,
                 None,
@@ -313,12 +286,12 @@ pub async fn fetch_and_save_full_mailbox(
             &mut session,
             account_id,
             mailbox_id,
-            total_to_fetch,
+            total,
             page as u64,
             page_size as u64,
             &mailbox.encoded_name(),
-            desc,
             token.clone(),
+            &mut max_uid,
         )
         .await
         {
@@ -327,7 +300,7 @@ pub async fn fetch_and_save_full_mailbox(
                 DownloadState::update_folder_progress(
                     account_id,
                     mailbox.name.clone(),
-                    total_to_fetch,
+                    total,
                     current_processed,
                     FolderStatus::Downloading,
                     None,
@@ -339,7 +312,7 @@ pub async fn fetch_and_save_full_mailbox(
                 DownloadState::update_folder_progress(
                     account_id,
                     mailbox.name.clone(),
-                    total_to_fetch,
+                    total,
                     current_processed,
                     FolderStatus::Failed,
                     Some(err_msg),
@@ -354,71 +327,14 @@ pub async fn fetch_and_save_full_mailbox(
         DownloadState::update_folder_progress(
             account_id,
             mailbox.name.clone(),
-            total_to_fetch,
+            total,
             current_processed,
             FolderStatus::Success,
             None,
         )?;
     }
     session.logout().await.ok();
-    Ok(())
-}
-
-pub fn generate_uid_sequence_hashset(
-    unique_nums: Vec<u32>,
-    chunk_size: usize,
-    desc: bool,
-) -> Vec<(String, u64)> {
-    assert!(!unique_nums.is_empty());
-    let mut nums = unique_nums;
-    if desc {
-        nums.reverse();
-    }
-
-    let mut result = Vec::new();
-
-    for chunk in nums.chunks(chunk_size) {
-        let size = chunk.len() as u64;
-        let compressed = compress_uid_list(chunk.to_vec());
-        result.push((compressed, size));
-    }
-
-    result
-}
-
-pub fn compress_uid_list(nums: Vec<u32>) -> String {
-    if nums.is_empty() {
-        return String::new();
-    }
-
-    let mut sorted_nums = nums;
-    sorted_nums.sort();
-
-    let mut result = Vec::new();
-    let mut current_range_start = sorted_nums[0];
-    let mut current_range_end = sorted_nums[0];
-
-    for &n in sorted_nums.iter().skip(1) {
-        if n == current_range_end + 1 {
-            current_range_end = n;
-        } else {
-            if current_range_start == current_range_end {
-                result.push(current_range_start.to_string());
-            } else {
-                result.push(format!("{}:{}", current_range_start, current_range_end));
-            }
-            current_range_start = n;
-            current_range_end = n;
-        }
-    }
-
-    if current_range_start == current_range_end {
-        result.push(current_range_start.to_string());
-    } else {
-        result.push(format!("{}:{}", current_range_start, current_range_end));
-    }
-
-    result.join(",")
+    Ok(max_uid)
 }
 
 pub async fn reconcile_mailboxes(
@@ -448,7 +364,7 @@ pub async fn reconcile_mailboxes(
                 break;
             }
 
-            if local_mailbox.uid_validity != remote_mailbox.uid_validity {
+            let new_highest_uid = if local_mailbox.uid_validity != remote_mailbox.uid_validity {
                 if remote_mailbox.uid_validity.is_none() {
                     let err_msg = format!(
                         "Mailbox '{}' logic error: Server did not provide UIDVALIDITY.",
@@ -493,7 +409,7 @@ pub async fn reconcile_mailboxes(
                             FetchDirection::Since,
                             token.clone(),
                         )
-                        .await?;
+                        .await?
                     }
                     None => match &account.date_before {
                         Some(r) => {
@@ -505,7 +421,7 @@ pub async fn reconcile_mailboxes(
                                 FetchDirection::Before,
                                 token.clone(),
                             )
-                            .await?;
+                            .await?
                         }
                         None => {
                             rebuild_mailbox_cache(
@@ -520,10 +436,12 @@ pub async fn reconcile_mailboxes(
                 }
             } else {
                 perform_incremental_sync(account, local_mailbox, remote_mailbox, token.clone())
-                    .await?;
-            }
+                    .await?
+            };
 
-            mailboxes_to_update.push(remote_mailbox.clone());
+            let mut updated = remote_mailbox.clone();
+            updated.highest_uid = new_highest_uid;
+            mailboxes_to_update.push(updated);
         }
         //The metadata of this mailbox must only be updated after a successful synchronization;
         //otherwise, it may cause synchronization errors and result in missing emails in the local sync results.
@@ -598,7 +516,11 @@ pub async fn reconcile_mailboxes(
                 };
 
                 match result {
-                    Ok(_) => {}
+                    Ok(new_highest_uid) => {
+                        let mut updated = mailbox.clone();
+                        updated.highest_uid = new_highest_uid;
+                        MailBox::batch_upsert(&[updated])?;
+                    }
                     Err(err) => {
                         has_error = true;
                         tracing::error!("Folder sync task failed: {:#?}", err);
@@ -622,57 +544,102 @@ pub async fn reconcile_mailboxes(
 }
 
 //only check new emails and sync
+/// Incrementally syncs a mailbox.
+/// Returns the new highest UID after sync, or `None` if nothing changed.
 async fn perform_incremental_sync(
     account: &AccountModel,
     local_mailbox: &MailBox,
     remote_mailbox: &MailBox,
     token: CancellationToken,
-) -> BichonResult<()> {
+) -> BichonResult<Option<u32>> {
     if remote_mailbox.exists > 0 {
-        let local_max_uid = ENVELOPE_MANAGER.get_max_uid(account.id, local_mailbox.id)?;
-        match local_max_uid {
-            Some(max_uid) => {
-                let mut session = ImapExecutor::create_connection(account.id).await?;
-                let before_date = account
-                    .date_before
-                    .as_ref()
-                    .map(|r| r.calculate_date())
-                    .transpose()?;
-
-                ImapExecutor::fetch_new_mail(
-                    &mut session,
-                    account,
-                    local_mailbox,
-                    max_uid + 1,
-                    before_date.as_deref(),
-                    token,
-                )
-                .await?;
-                session.logout().await.ok();
+        // Use stored highest_uid if available; otherwise fall back to Tantivy
+        // query once (backward compatibility with pre-existing databases).
+        let start_uid = match local_mailbox.highest_uid {
+            Some(uid) => {
+                tracing::info!(
+                    "[account {}][mailbox {}] perform_incremental_sync: stored highest_uid={}, remote.exists={}",
+                    account.id,
+                    local_mailbox.name,
+                    uid,
+                    remote_mailbox.exists
+                );
+                uid as u64 + 1
             }
             None => {
-                info!(
-                    "No maximum UID found in index for mailbox, assuming local cache is missing."
+                let local_max_uid =
+                    ENVELOPE_MANAGER.get_max_uid(account.id, local_mailbox.id)?;
+                tracing::info!(
+                    "[account {}][mailbox {}] perform_incremental_sync: highest_uid unset, Tantivy max_uid={:?}, remote.exists={}",
+                    account.id,
+                    local_mailbox.name,
+                    local_max_uid,
+                    remote_mailbox.exists
                 );
-
-                match &account.date_since {
-                    Some(date_since) => {
-                        fetch_and_save_by_date(
-                            account,
-                            date_since.since_date()?.as_str(),
-                            remote_mailbox,
-                            FetchDirection::Since,
-                            token,
-                        )
-                        .await?;
-                    }
+                match local_max_uid {
+                    Some(uid) => uid + 1,
                     None => {
-                        fetch_and_save_full_mailbox(account, remote_mailbox, token).await?;
+                        info!(
+                            "No maximum UID found in index for mailbox, assuming local storage is missing."
+                        );
+
+                        let result = match &account.date_since {
+                            Some(date_since) => {
+                                fetch_and_save_by_date(
+                                    account,
+                                    date_since.since_date()?.as_str(),
+                                    remote_mailbox,
+                                    FetchDirection::Since,
+                                    token,
+                                )
+                                .await?
+                            }
+                            None => match &account.date_before {
+                                Some(r) => {
+                                    fetch_and_save_by_date(
+                                        account,
+                                        &r.calculate_date()?,
+                                        remote_mailbox,
+                                        FetchDirection::Before,
+                                        token,
+                                    )
+                                    .await?
+                                }
+                                None => {
+                                    fetch_and_save_full_mailbox(
+                                        account, remote_mailbox, token,
+                                    )
+                                    .await?
+                                }
+                            },
+                        };
+                        return Ok(result);
                     }
                 }
             }
-        }
-    }
+        };
 
-    Ok(())
+        let mut session = ImapExecutor::create_connection(account.id).await?;
+        let before_date = account
+            .date_before
+            .as_ref()
+            .map(|r| r.calculate_date())
+            .transpose()?;
+
+        let new_max_uid = ImapExecutor::fetch_new_mail(
+            &mut session,
+            account,
+            local_mailbox,
+            start_uid,
+            before_date.as_deref(),
+            token,
+        )
+        .await?;
+        session.logout().await.ok();
+
+        // Keep existing highest_uid if no new mail was fetched.
+        Ok(new_max_uid.or(local_mailbox.highest_uid))
+    } else {
+        Ok(local_mailbox.highest_uid)
+    }
 }

crates/core/src/cache/imap/download/rebuild.rs

@@ -89,7 +89,11 @@ pub async fn rebuild_cache(
         };
 
         match fetch_and_save_full_mailbox(&account, &mailbox, token.clone()).await {
-            Ok(_) => {}
+            Ok(new_highest_uid) => {
+                let mut updated = mailbox.clone();
+                updated.highest_uid = new_highest_uid;
+                MailBox::batch_upsert(&[updated])?;
+            }
             Err(err) => {
                 has_error = true;
                 tracing::error!("Folder sync task failed: {:#?}", err);
@@ -169,7 +173,11 @@ pub async fn rebuild_cache_by_date(
         match fetch_and_save_by_date(&account, date.as_str(), &mailbox, direction, token.clone())
             .await
         {
-            Ok(_) => {}
+            Ok(new_highest_uid) => {
+                let mut updated = mailbox.clone();
+                updated.highest_uid = new_highest_uid;
+                MailBox::batch_upsert(&[updated])?;
+            }
             Err(err) => {
                 has_error = true;
                 tracing::error!("Folder sync task failed: {:#?}", err);
@@ -196,7 +204,7 @@ pub async fn rebuild_mailbox_cache(
     local_mailbox: &MailBox,
     remote_mailbox: &MailBox,
     token: CancellationToken,
-) -> BichonResult<()> {
+) -> BichonResult<Option<u32>> {
     ENVELOPE_MANAGER
         .delete_mailbox_envelopes(account.id, vec![local_mailbox.id])
         .await?;
@@ -217,11 +225,11 @@ pub async fn rebuild_mailbox_cache(
             FolderStatus::Success,
             None,
         )?;
-        return Ok(());
+        return Ok(None);
     }
 
-    fetch_and_save_full_mailbox(account, remote_mailbox, token).await?;
-    Ok(())
+    let result = fetch_and_save_full_mailbox(account, remote_mailbox, token).await?;
+    Ok(result)
 }
 
 pub async fn rebuild_mailbox_cache_by_date(
@@ -231,7 +239,7 @@ pub async fn rebuild_mailbox_cache_by_date(
     remote: &MailBox,
     direction: FetchDirection,
     token: CancellationToken,
-) -> BichonResult<()> {
+) -> BichonResult<Option<u32>> {
     ENVELOPE_MANAGER
         .delete_mailbox_envelopes(account.id, vec![local_mailbox_id])
         .await?;
@@ -252,9 +260,9 @@ pub async fn rebuild_mailbox_cache_by_date(
             FolderStatus::Success,
             None,
         )?;
-        return Ok(());
+        return Ok(None);
     }
 
-    fetch_and_save_by_date(account, date, remote, direction, token).await?;
-    Ok(())
+    let result = fetch_and_save_by_date(account, date, remote, direction, token).await?;
+    Ok(result)
 }

crates/core/src/cache/imap/mailbox.rs

@@ -56,6 +56,10 @@ pub struct MailBox {
     /// The validity identifier for UIDs in this mailbox, used to ensure UID consistency across sessions.
     /// If `None`, the IMAP server has not provided this information.
     pub uid_validity: Option<u32>,
+    /// The highest UID that has been successfully downloaded and stored locally.
+    /// Used for incremental sync: next fetch starts from `highest_uid + 1`.
+    /// If `None`, a fallback query against the Tantivy index will be performed once.
+    pub highest_uid: Option<u32>,
 }
 
 impl MemDbModel for MailBox {

crates/core/src/database/manager.rs

@@ -32,12 +32,16 @@ impl DatabaseManager {
         let db_path = &DATA_DIR_MANAGER.memdb_dir;
         std::fs::create_dir_all(db_path).expect("Failed to create memdb data directory");
 
-        let db = MemDb::open_with(db_path, Durability::Full)
+        let db = MemDb::open_with(db_path, Durability::Batch { max_ops: 100 })
             .expect("Failed to open memdb database");
 
         // Start periodic snapshot worker (every 5 minutes)
         db.start_snapshot_worker(Duration::from_secs(300));
 
+        // Start periodic flush worker (every 10 seconds) so buffered writes
+        // are flushed regularly and not only at the batch threshold.
+        db.start_flush_worker(Duration::from_secs(10));
+
         DatabaseManager { db }
     }
 
@@ -45,4 +49,12 @@ impl DatabaseManager {
     pub fn db(&self) -> &MemDb {
         &self.db
     }
+
+    /// Flush any buffered WAL entries to disk. Must be called before shutdown
+    /// to avoid losing writes that haven't hit the batch threshold yet.
+    pub fn flush(&self) {
+        if let Err(e) = self.db.flush() {
+            eprintln!("[memdb] flush error on shutdown: {e}");
+        }
+    }
 }

crates/core/src/envelope/extractor.rs

@@ -197,33 +197,37 @@ async fn extract_envelope_core(
     let attachment_docs: Vec<TantivyDocument> = attachments
         .iter()
         .filter(|a| !a.inline || a.content_id.is_none())
-        .map(|a| AttachmentModel {
-            id: Uuid::new_v4().to_string(),
-            envelope_id: envelope_id.clone(),
-            account_id,
-            account_email: None,
-            mailbox_id,
-            mailbox_name: None,
-            subject: subject.clone(),
-            content_hash: a.content_hash.clone(),
-            from: from.clone(),
-            date,
-            ingest_at: now,
-            size: a.size as u64,
-            ext: a.get_extension(),
-            category: a.get_category().to_string(),
-            content_type: a.file_type.clone(),
-            shard_id: 0,
-            text: None,
-            has_text: false,
-            is_ocr: false,
-            page_count: None,
-            is_indexed: false,
-            is_message: a.is_message,
-            name: a.filename.clone(),
-            tags: None,
-            auto_tags: None,
-        }).map(|a|a.into_document())
+        .map(|a| {
+            let has_text = a.extracted_text.is_some();
+            AttachmentModel {
+                id: Uuid::new_v4().to_string(),
+                envelope_id: envelope_id.clone(),
+                account_id,
+                account_email: None,
+                mailbox_id,
+                mailbox_name: None,
+                subject: subject.clone(),
+                content_hash: a.content_hash.clone(),
+                from: from.clone(),
+                date,
+                ingest_at: now,
+                size: a.size as u64,
+                ext: a.get_extension(),
+                category: a.get_category().to_string(),
+                content_type: a.file_type.clone(),
+                shard_id: 0,
+                text: a.extracted_text.clone(),
+                has_text,
+                is_ocr: a.extracted_is_ocr,
+                page_count: a.extracted_page_count.map(|n| n as u64),
+                is_indexed: has_text,
+                is_message: a.is_message,
+                name: a.filename.clone(),
+                tags: None,
+                auto_tags: None,
+            }
+        })
+        .map(|a| a.into_document())
         .collect();
 
     let envelope = Envelope {
@@ -256,6 +260,14 @@ async fn extract_envelope_core(
         attachments: Some(attachments),
     };
     let doc = ea.to_document(&body_text, 0)?;
+    tracing::debug!(
+        "[account {}][mailbox {}] extract: uid={} msg_id={} content_hash={}",
+        account_id,
+        mailbox_id,
+        uid,
+        &ea.envelope.message_id,
+        &ea.envelope.content_hash,
+    );
     ENVELOPE_MANAGER.queue(doc).await;
     for doc in attachment_docs {
         ATTACHMENT_MANAGER.queue(doc).await;
@@ -389,44 +401,125 @@ pub async fn detach_and_store_attachments(
 
     ranges.sort_by(|a, b| b.0.cmp(&a.0));
     let mut attachments = Vec::with_capacity(ranges.len());
+
+    // Collect candidates for text extraction (non-inline, known document types).
+    struct TextCandidate {
+        content_hash: String,
+        file_type: String,
+        ext: String,
+        bytes: Vec<u8>,
+    }
+    let mut text_candidates: Vec<TextCandidate> = Vec::new();
+
     for (raw_start, raw_end, att) in ranges {
-        // Step 2: Extract raw bytes and store them as standalone documents
-        let raw_bytes = &original_body[raw_start..raw_end];
-        //This is the content hash of the decoded attachment, not the undecoded one.
+        // mail-parser may report attachment offsets past the body end for
+        // malformed messages; clamp the range to avoid a slice panic.
+        let body_len = original_body.len();
+        let raw_start = raw_start.min(body_len);
+        let raw_end = raw_end.min(body_len);
+        let range_valid = raw_start < raw_end;
+
+        // content hash is computed from the decoded attachment contents,
+        // which is always available regardless of raw offset validity.
         let content_hash = compute_content_hash(att.contents());
 
-        //"The actual content stored in the blob is the raw undecoded data, to avoid the reconstructed EML differing from the original due to decoding and re-encoding.
-        attachments.push((content_hash.clone(), Bytes::copy_from_slice(raw_bytes)));//
+        if range_valid {
+            let raw_bytes = &original_body[raw_start..raw_end];
+            // The actual content stored in the blob is the raw undecoded data.
+            attachments.push((content_hash.clone(), Bytes::copy_from_slice(raw_bytes)));
 
-        // Step 3: Replace raw attachment content with a hash-based placeholder
-        let placeholder = format!("<<BICHON_DETACH_HASH:{}>>", &content_hash);
-        let p_bytes = placeholder.as_bytes();
-        stripped_eml.splice(raw_start..raw_end, p_bytes.iter().cloned());
+            // Replace raw attachment content with a hash-based placeholder
+            let placeholder = format!("<<BICHON_DETACH_HASH:{}>>", &content_hash);
+            stripped_eml.splice(raw_start..raw_end, placeholder.as_bytes().iter().cloned());
+        } else {
+            // Invalid range: store a zero-length blob so the consistency
+            // check passes; reattachment will log a warning for the missing
+            // blob data but won't panic.
+            attachments.push((content_hash.clone(), Bytes::new()));
+        }
+
+        let inline = att
+            .content_disposition()
+            .map(|d| d.is_inline())
+            .unwrap_or_else(|| att.content_id().is_some());
+        let file_type = att
+            .content_type()
+            .map(|ct| {
+                format!(
+                    "{}/{}",
+                    ct.c_type.as_ref(),
+                    ct.c_subtype.as_deref().unwrap_or("")
+                )
+            })
+            .unwrap_or_else(|| "application/octet-stream".to_string());
+        let has_cid = att.content_id().is_some();
+        let ext = att
+            .attachment_name()
+            .and_then(|n| {
+                std::path::Path::new(&n)
+                    .extension()
+                    .and_then(|e| e.to_str())
+                    .map(|s| s.to_ascii_lowercase())
+            })
+            .unwrap_or_default();
+
+        if !inline || !has_cid {
+            let decoded_len = att.contents().len();
+            if decoded_len <= crate::ext::text_extractor::MAX_EXTRACT_BYTES
+                && crate::ext::text_extractor::should_try_extract(&file_type, &ext)
+            {
+                text_candidates.push(TextCandidate {
+                    content_hash: content_hash.clone(),
+                    file_type: file_type.clone(),
+                    ext: ext.clone(),
+                    bytes: att.contents().to_vec(),
+                });
+            }
+        }
 
         let info = AttachmentInfo {
             filename: att.attachment_name().map(|n| n.to_string()),
             size: att.contents().len(),
-            inline: att
-                .content_disposition()
-                .map(|d| d.is_inline())
-                .unwrap_or(false),
-            file_type: att
-                .content_type()
-                .map(|ct| {
-                    format!(
-                        "{}/{}",
-                        ct.c_type.as_ref(),
-                        ct.c_subtype.as_deref().unwrap_or("")
-                    )
-                })
-                .unwrap_or_else(|| "application/octet-stream".to_string()),
+            inline,
+            file_type,
             content_id: att.content_id().map(|id| id.to_string()),
             content_hash: content_hash.clone(),
             is_message: att.is_message(),
+            extracted_text: None,
+            extracted_page_count: None,
+            extracted_is_ocr: false,
         };
 
         attachment_infos.push(info);
     }
+
+    // Run text extraction in a single spawn_blocking batch.
+    if !text_candidates.is_empty() {
+        if let Ok(mut extracted_map) = tokio::task::spawn_blocking(move || {
+            let mut map: std::collections::HashMap<
+                String,
+                (String, Option<u32>, bool),
+            > = std::collections::HashMap::new();
+            for c in text_candidates {
+                if let Some(r) =
+                    crate::ext::text_extractor::extract_text(&c.file_type, &c.ext, &c.bytes)
+                {
+                    map.insert(c.content_hash, (r.text, r.page_count, r.is_ocr));
+                }
+            }
+            map
+        })
+        .await
+        {
+            for info in &mut attachment_infos {
+                if let Some((text, pages, is_ocr)) = extracted_map.remove(&info.content_hash) {
+                    info.extracted_text = Some(text);
+                    info.extracted_page_count = pages;
+                    info.extracted_is_ocr = is_ocr;
+                }
+            }
+        }
+    }
     // Step 4: Store the final stripped EML content
     BLOB_MANAGER
         .queue(DetachedEmail {
@@ -675,4 +768,56 @@ mod test {
             }
         }
     }
+
+    /// Verifies that [`super::detach_and_store_attachments`] does not panic
+    /// when mail-parser reports attachment offsets past the raw body length.
+    ///
+    /// Regression test for: "range end index X out of range for slice of
+    /// length Y" panic caused by a malformed email whose attachment
+    /// `raw_end_offset` exceeded the actual body size.
+    #[tokio::test]
+    async fn detach_attachments_bounds_check() {
+        let raw = concat!(
+            "From: sender@example.com\r\n",
+            "To: recipient@example.com\r\n",
+            "Subject: Test\r\n",
+            "MIME-Version: 1.0\r\n",
+            "Content-Type: multipart/mixed; boundary=\"bnd\"\r\n",
+            "\r\n",
+            "--bnd\r\n",
+            "Content-Type: text/plain\r\n",
+            "\r\n",
+            "Hello\r\n",
+            "--bnd\r\n",
+            "Content-Type: application/octet-stream\r\n",
+            "Content-Disposition: attachment; filename=\"test.bin\"\r\n",
+            "\r\n",
+            "AAAAABBBBBCCCCCDDDDDEEEEEAAAAABBBBBCCCCCDDDDDEEEEE\r\n",
+            "--bnd--\r\n",
+        )
+        .as_bytes()
+        .to_vec();
+
+        let message = mail_parser::MessageParser::new()
+            .parse(&raw)
+            .expect("parse valid MIME message");
+        assert_eq!(message.attachment_count(), 1);
+
+        // Truncate the raw body so the attachment's raw_end_offset lies
+        // past the body end — exactly the scenario reported by users.
+        let truncated = &raw[..raw.len() - 20];
+        assert!(truncated.len() < raw.len());
+
+        // Must not panic.
+        let infos = super::detach_and_store_attachments(
+            truncated,
+            &message,
+            "test_content_hash",
+        )
+        .await;
+
+        // The attachment count must still match so the consistency check
+        // in reattach_eml_content doesn't fail later.
+        assert_eq!(infos.len(), 1);
+    }
 }

crates/core/src/ext/event_bus.rs

@@ -0,0 +1,86 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Event bus extension point.
+//
+// Community edition: NoopEventBus — all events are discarded.
+// Pro edition: AuditEventBus — events are persisted to audit database.
+// Enterprise edition: adds SIEM webhook to the same trait impl.
+//
+// The open-source server emits events at key points (login, view, delete, search).
+// It never reads from the event bus — events are fire-and-forget.
+
+use std::net::IpAddr;
+use std::sync::{LazyLock, RwLock};
+
+#[derive(Debug, Clone)]
+pub enum Event {
+    EmailViewed {
+        email_id: String,
+        user: String,
+        ip: IpAddr,
+    },
+    EmailDeleted {
+        email_id: String,
+        user: String,
+    },
+    UserLoggedIn {
+        user: String,
+        ip: IpAddr,
+    },
+    UserCreated {
+        created_by: String,
+        new_user: String,
+    },
+    SearchPerformed {
+        query: String,
+        user: String,
+    },
+    SettingsChanged {
+        key: String,
+        user: String,
+    },
+    AttachmentDownloaded {
+        email_id: String,
+        content_hash: String,
+        user: String,
+    },
+}
+
+pub trait EventBus: Send + Sync {
+    fn emit(&self, event: Event);
+}
+
+/// Default — all events are discarded.
+struct NoopEventBus;
+impl EventBus for NoopEventBus {
+    fn emit(&self, _event: Event) {}
+}
+
+static EVENT_BUS: LazyLock<RwLock<Box<dyn EventBus>>> =
+    LazyLock::new(|| RwLock::new(Box::new(NoopEventBus)));
+
+/// Called by Pro/Enterprise at startup to replace the noop default.
+pub fn set_event_bus(bus: Box<dyn EventBus>) {
+    *EVENT_BUS.write().unwrap() = bus;
+}
+
+/// Fire-and-forget. Called by the server at key points.
+pub fn emit(event: Event) {
+    EVENT_BUS.read().unwrap().emit(event);
+}

crates/core/src/ext/mod.rs

@@ -0,0 +1,29 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Event bus extension point.
+//
+// Community edition: NoopEventBus — all events are discarded.
+// Pro edition: AuditEventBus — events are persisted to audit database.
+// Enterprise edition: adds SIEM webhook to the same trait impl.
+//
+// The open-source server emits events at key points (login, view, delete, search).
+// It never reads from the event bus — events are fire-and-forget.
+
+pub mod event_bus;
+pub mod text_extractor;

crates/core/src/ext/text_extractor.rs

@@ -0,0 +1,75 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// Attachment text extraction extension point.
+//
+// Community edition: NoopExtractor — no attachments are text-indexed.
+// Pro edition: PdfExtractor — extracts text from PDF, Word, etc.
+//
+// Used in: crates/core/src/envelope/extractor.rs
+
+use std::sync::{LazyLock, RwLock};
+
+pub struct ExtractedText {
+    pub text: String,
+    pub page_count: Option<u32>,
+    pub is_ocr: bool,
+}
+
+pub trait AttachmentTextExtractor: Send + Sync {
+    /// Returns None if this extractor doesn't handle the file type.
+    /// Returns Some(ExtractedText) if text was successfully extracted.
+    fn extract(&self, content_type: &str, ext: &str, bytes: &[u8]) -> Option<ExtractedText>;
+}
+
+/// Default — all attachments are skipped.
+struct NoopExtractor;
+impl AttachmentTextExtractor for NoopExtractor {
+    fn extract(&self, _ct: &str, _ext: &str, _bytes: &[u8]) -> Option<ExtractedText> {
+        None
+    }
+}
+
+static EXTRACTOR: LazyLock<RwLock<Box<dyn AttachmentTextExtractor>>> =
+    LazyLock::new(|| RwLock::new(Box::new(NoopExtractor)));
+
+/// Called by Pro/Enterprise at startup to replace the noop default.
+pub fn set_extractor(extractor: Box<dyn AttachmentTextExtractor>) {
+    *EXTRACTOR.write().unwrap() = extractor;
+}
+
+/// Attachments larger than this are skipped (10 MiB). Avoids excessive memory
+/// and CPU cost for huge files whose text is rarely useful for search.
+pub const MAX_EXTRACT_BYTES: usize = 10 * 1024 * 1024;
+
+/// Quick pre-filter: returns true for file types where text extraction may
+/// produce useful results. Avoids cloning attachment bytes for images, videos,
+/// archives, etc. when no registered extractor would handle them.
+pub fn should_try_extract(content_type: &str, ext: &str) -> bool {
+    matches!(
+        ext,
+        "pdf" | "doc" | "docx" | "xls" | "xlsx" | "ppt" | "pptx"
+            | "txt" | "rtf" | "odt" | "ods" | "odp"
+    ) || content_type.starts_with("text/")
+}
+
+/// Called by the attachment pipeline during IMAP sync.
+/// The caller should wrap this in spawn_blocking for CPU-bound extraction.
+pub fn extract_text(content_type: &str, ext: &str, bytes: &[u8]) -> Option<ExtractedText> {
+    EXTRACTOR.read().unwrap().extract(content_type, ext, bytes)
+}

crates/core/src/imap/executor.rs

@@ -17,8 +17,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 use crate::account::migration::AccountModel;
-use crate::account::state::{DownloadState, FolderStatus};
-use crate::cache::imap::download::flow::{generate_uid_sequence_hashset, DEFAULT_BATCH_SIZE};
+use crate::account::state::{DownloadState, DownloadStatus, FolderStatus};
 use crate::cache::imap::mailbox::MailBox;
 use crate::envelope::extractor::extract_envelope_and_store_it;
 use crate::error::code::ErrorCode;
@@ -80,6 +79,15 @@ impl ImapExecutor {
             .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed))
     }
 
+    /// Fetches new mail for a mailbox.
+    ///
+    /// When `before` is `Some(date)`, a two-step approach is used:
+    /// `UID SEARCH` to find matching UIDs (standard IMAP), then batch `UID FETCH`
+    /// for the specific UIDs. When `before` is `None`, a direct ranged
+    /// `UID FETCH {start}:*` is issued and results are streamed.
+    ///
+    /// Returns `Ok(Some(max_uid))` with the highest UID fetched, or `Ok(None)`
+    /// if no new mail was found.
     pub async fn fetch_new_mail(
         session: &mut Session<Box<dyn SessionStream>>,
         account: &AccountModel,
@@ -87,114 +95,197 @@ impl ImapExecutor {
         start_uid: u64,
         before: Option<&str>,
         token: CancellationToken,
-    ) -> BichonResult<()> {
+    ) -> BichonResult<Option<u32>> {
         assert!(start_uid > 0, "start_uid must be greater than 0");
 
-        let query = match before {
-            Some(date) => format!("UID {start_uid}:* BEFORE {date}"),
-            None => format!("UID {start_uid}:*"),
-        };
+        session
+            .examine(&mailbox.encoded_name())
+            .await
+            .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed))?;
 
-        let uid_list = match Self::uid_search(session, &mailbox.encoded_name(), &query).await {
-            Ok(uid_list) => uid_list,
-            Err(e) => {
-                let err_msg = format!("UID search failed in [{}]: {:#?}", mailbox.name, e);
-                DownloadState::update_folder_progress(
-                    account.id,
-                    mailbox.name.clone(),
-                    0,
-                    0,
-                    FolderStatus::Failed,
-                    Some(err_msg.clone()),
-                )?;
-                DownloadState::append_session_error(account.id, err_msg)?;
-                return Err(e);
+        match before {
+            Some(date) => {
+                Self::fetch_new_mail_with_before(session, account, mailbox, start_uid, date, token)
+                    .await
             }
-        };
+            None => Self::fetch_new_mail_range(session, account, mailbox, start_uid, token).await,
+        }
+    }
 
-        let len = uid_list.len();
-        if len == 0 {
-            let msg = match before {
-                Some(date) => format!("No emails found before {}.", date),
-                None => "No new emails found.".into(),
-            };
+    /// Two-step approach for date-filtered incremental fetch: UID SEARCH first,
+    /// then batch UID FETCH for matching UIDs. Uses standard IMAP syntax that
+    /// works across all compliant servers.
+    async fn fetch_new_mail_with_before(
+        session: &mut Session<Box<dyn SessionStream>>,
+        account: &AccountModel,
+        mailbox: &MailBox,
+        start_uid: u64,
+        date: &str,
+        token: CancellationToken,
+    ) -> BichonResult<Option<u32>> {
+        let query = format!("UID {start_uid}:* BEFORE {date}");
+        info!(
+            "[account {}][mailbox {}] fetch_new_mail: UID SEARCH {}",
+            account.id, mailbox.name, query
+        );
+        let results = session.uid_search(&query).await.map_err(|e| {
+            let err_msg = format!("UID SEARCH failed in [{}]: {:#?}", mailbox.name, e);
+            let _ = DownloadState::append_session_error(account.id, err_msg);
+            raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed)
+        })?;
+
+        if results.is_empty() {
             DownloadState::update_folder_progress(
                 account.id,
                 mailbox.name.clone(),
                 0,
                 0,
                 FolderStatus::Success,
-                Some(msg),
+                Some("No new emails found.".into()),
             )?;
-            return Ok(());
+            return Ok(None);
         }
-        info!(
-            "[account {}][mailbox {}] {} envelopes need to be fetched",
-            account.id, mailbox.name, len
-        );
 
-        let mut uid_vec: Vec<u32> = uid_list.into_iter().collect();
+        let mut uid_vec: Vec<u32> = results.into_iter().collect();
         uid_vec.sort();
-        let uid_batches = generate_uid_sequence_hashset(
-            uid_vec,
-            account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE) as usize,
-            false,
-        );
-        let mut current_processed = 0u64;
-        let mut has_error_or_cancel = false;
-        for (index, batch) in uid_batches.into_iter().enumerate() {
+        let max_uid = uid_vec.last().copied();
+        let planned = uid_vec.len() as u64;
+        let batch_size = account.download_batch_size.unwrap_or(DEFAULT_BATCH_SIZE) as usize;
+        let uid_batches = generate_uid_sequence_hashset(uid_vec, batch_size);
+
+        DownloadState::update_folder_progress(
+            account.id,
+            mailbox.name.clone(),
+            planned,
+            0,
+            FolderStatus::Pending,
+            None,
+        )?;
+
+        let mut count = 0u64;
+        for batch in uid_batches {
             if token.is_cancelled() {
-                break;
+                DownloadState::update_session_status(
+                    account.id,
+                    DownloadStatus::Cancelled,
+                    Some("User stopped or system shutdown".to_string()),
+                )?;
+                DownloadState::update_folder_progress(
+                    account.id,
+                    mailbox.name.clone(),
+                    planned,
+                    count,
+                    FolderStatus::Cancelled,
+                    None,
+                )?;
+                return Err(raise_error!(
+                    "Stream cancelled".into(),
+                    ErrorCode::InternalError
+                ));
             }
-            match Self::uid_batch_retrieve_emails(
+            Self::uid_batch_retrieve_emails(
                 session,
                 account.id,
                 mailbox.id,
                 &batch.0,
                 token.clone(),
             )
-            .await
-            {
-                Ok(_) => {
-                    current_processed += batch.1;
-                    DownloadState::update_folder_progress(
-                        account.id,
-                        mailbox.name.clone(),
-                        len as u64,
-                        current_processed,
-                        FolderStatus::Downloading,
-                        None,
-                    )?;
-                }
-                Err(e) => {
-                    let err_msg = format!("Batch {} failed: {:#?}", index, e);
-                    DownloadState::append_session_error(account.id, err_msg.clone())?;
-                    DownloadState::update_folder_progress(
-                        account.id,
-                        mailbox.name.clone(),
-                        len as u64,
-                        current_processed,
-                        FolderStatus::Failed,
-                        Some(err_msg),
-                    )?;
-                    has_error_or_cancel = true;
-                    break;
-                }
-            }
-        }
-
-        if !has_error_or_cancel {
+            .await?;
+            count += batch.1;
             DownloadState::update_folder_progress(
                 account.id,
                 mailbox.name.clone(),
-                len as u64,
-                current_processed,
+                planned,
+                count,
+                FolderStatus::Downloading,
+                None,
+            )?;
+        }
+
+        DownloadState::update_folder_progress(
+            account.id,
+            mailbox.name.clone(),
+            count,
+            count,
+            FolderStatus::Success,
+            None,
+        )?;
+
+        Ok(max_uid)
+    }
+
+    /// Direct ranged UID FETCH without date filtering. Streams results from
+    /// the server in a single IMAP round-trip.
+    async fn fetch_new_mail_range(
+        session: &mut Session<Box<dyn SessionStream>>,
+        account: &AccountModel,
+        mailbox: &MailBox,
+        start_uid: u64,
+        token: CancellationToken,
+    ) -> BichonResult<Option<u32>> {
+        let uid_range = format!("{start_uid}:*");
+        info!(
+            "[account {}][mailbox {}] fetch_new_mail: direct UID FETCH {}",
+            account.id, mailbox.name, uid_range
+        );
+
+        let mut stream = session
+            .uid_fetch(&uid_range, BODY_FETCH_COMMAND)
+            .await
+            .map_err(|e| {
+                let err_msg = format!("UID FETCH failed in [{}]: {:#?}", mailbox.name, e);
+                let _ = DownloadState::append_session_error(account.id, err_msg);
+                raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed)
+            })?;
+
+        let mut count = 0u64;
+        let mut max_uid: Option<u32> = None;
+        while let Some(fetch) = stream
+            .try_next()
+            .await
+            .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed))?
+        {
+            if token.is_cancelled() {
+                tracing::info!("Account {}: fetch_new_mail stream interrupted.", account.id);
+                DownloadState::update_session_status(
+                    account.id,
+                    DownloadStatus::Cancelled,
+                    Some("User stopped or system shutdown".to_string()),
+                )?;
+                return Err(raise_error!(
+                    "Stream cancelled".into(),
+                    ErrorCode::InternalError
+                ));
+            }
+
+            if let Some(uid) = fetch.uid {
+                max_uid = Some(max_uid.unwrap_or(0).max(uid));
+            }
+            extract_envelope_and_store_it(fetch, account.id, mailbox.id).await?;
+            count += 1;
+        }
+
+        if count == 0 {
+            DownloadState::update_folder_progress(
+                account.id,
+                mailbox.name.clone(),
+                0,
+                0,
+                FolderStatus::Success,
+                Some("No new emails found.".into()),
+            )?;
+        } else {
+            DownloadState::update_folder_progress(
+                account.id,
+                mailbox.name.clone(),
+                count,
+                count,
                 FolderStatus::Success,
                 None,
             )?;
         }
 
-        Ok(())
+        Ok(max_uid)
     }
 
     pub async fn batch_retrieve_emails(
@@ -205,36 +296,23 @@ impl ImapExecutor {
         page: u64,
         page_size: u64,
         encoded_mailbox_name: &str,
-        desc: bool,
         token: CancellationToken,
+        max_uid: &mut Option<u32>,
     ) -> BichonResult<usize> {
         assert!(page > 0, "Page number must be greater than 0");
         assert!(page_size > 0, "Page size must be greater than 0");
 
-        let (start, end) = if desc {
-            // Fetch messages starting from the newest (descending order)
-            let end = total.saturating_sub((page - 1) * page_size);
-            if end == 0 {
-                return Ok(0);
-            }
-            // Calculate start as end - page_size + 1 to avoid off-by-one errors
-            let start = end.saturating_sub(page_size - 1).max(1);
-            (start, end)
-        } else {
-            // Fetch messages starting from the oldest (ascending order)
-            let start = (page - 1) * page_size + 1;
-            if start > total {
-                return Ok(0);
-            }
-            // Calculate end, capped by the total number of messages
-            let end = (start + page_size - 1).min(total);
-            (start, end)
-        };
+        // Fetch messages starting from the oldest (ascending order).
+        let start = (page - 1) * page_size + 1;
+        if start > total {
+            return Ok(0);
+        }
+        let end = (start + page_size - 1).min(total);
 
         let sequence_set = format!("{}:{}", start, end);
         info!(
-            "Fetching mailbox '{}' messages: sequence {} (page {}, page_size {}, desc={})",
-            encoded_mailbox_name, sequence_set, page, page_size, desc
+            "Fetching mailbox '{}' messages: sequence {} (page {}, page_size {})",
+            encoded_mailbox_name, sequence_set, page, page_size
         );
 
         let mut stream = session
@@ -255,6 +333,9 @@ impl ImapExecutor {
                     ErrorCode::InternalError
                 ));
             }
+            if let Some(uid) = fetch.uid {
+                *max_uid = Some((*max_uid).unwrap_or(0).max(uid));
+            }
             extract_envelope_and_store_it(fetch, account_id, mailbox_id).await?;
             count += 1;
         }
@@ -347,3 +428,120 @@ impl ImapExecutor {
         ImapConnectionManager::build(account_id).await
     }
 }
+
+pub const DEFAULT_BATCH_SIZE: u32 = 30;
+
+/// Compresses a sorted list of UIDs into an IMAP sequence-set string.
+/// Consecutive UIDs become ranges (e.g. `1:5`), non-consecutive are
+/// comma-separated (e.g. `1:5,10,12:15`).
+pub fn compress_uid_list(nums: Vec<u32>) -> String {
+    if nums.is_empty() {
+        return String::new();
+    }
+
+    let mut sorted_nums = nums;
+    sorted_nums.sort();
+
+    let mut result = Vec::new();
+    let mut current_range_start = sorted_nums[0];
+    let mut current_range_end = sorted_nums[0];
+
+    for &n in sorted_nums.iter().skip(1) {
+        if n == current_range_end + 1 {
+            current_range_end = n;
+        } else {
+            if current_range_start == current_range_end {
+                result.push(current_range_start.to_string());
+            } else {
+                result.push(format!("{}:{}", current_range_start, current_range_end));
+            }
+            current_range_start = n;
+            current_range_end = n;
+        }
+    }
+
+    if current_range_start == current_range_end {
+        result.push(current_range_start.to_string());
+    } else {
+        result.push(format!("{}:{}", current_range_start, current_range_end));
+    }
+
+    result.join(",")
+}
+
+/// Splits a sorted list of unique UIDs into compressed sequence-set batches.
+/// Returns `Vec<(sequence_set_string, batch_count)>`.
+pub fn generate_uid_sequence_hashset(
+    unique_nums: Vec<u32>,
+    chunk_size: usize,
+) -> Vec<(String, u64)> {
+    assert!(!unique_nums.is_empty());
+
+    let mut result = Vec::new();
+    let nums = unique_nums;
+
+    for chunk in nums.chunks(chunk_size) {
+        let size = chunk.len() as u64;
+        let compressed = compress_uid_list(chunk.to_vec());
+        result.push((compressed, size));
+    }
+
+    result
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    // ── compress_uid_list ──────────────────────────────────────────
+
+    #[test]
+    fn compress_empty() {
+        assert_eq!(compress_uid_list(vec![]), "");
+    }
+
+    #[test]
+    fn compress_single_uid() {
+        assert_eq!(compress_uid_list(vec![42]), "42");
+    }
+
+    #[test]
+    fn compress_consecutive_range() {
+        assert_eq!(compress_uid_list(vec![1, 2, 3, 4, 5]), "1:5");
+    }
+
+    #[test]
+    fn compress_mixed_ranges() {
+        assert_eq!(
+            compress_uid_list(vec![1, 2, 3, 5, 7, 8, 9, 10]),
+            "1:3,5,7:10"
+        );
+    }
+
+    #[test]
+    fn compress_gap_at_boundary() {
+        assert_eq!(compress_uid_list(vec![1, 2, 4, 5]), "1:2,4:5");
+    }
+
+    // ── generate_uid_sequence_hashset ──────────────────────────────
+
+    #[test]
+    fn batch_single_chunk() {
+        let batches = generate_uid_sequence_hashset(vec![1, 2, 3], 10);
+        assert_eq!(batches.len(), 1);
+        assert_eq!(batches[0].0, "1:3");
+        assert_eq!(batches[0].1, 3);
+    }
+
+    #[test]
+    fn batch_multiple_chunks() {
+        let batches = generate_uid_sequence_hashset(vec![1, 2, 3, 4, 5], 2);
+        assert_eq!(batches.len(), 3);
+        assert_eq!(batches[0].0, "1:2");
+        assert_eq!(batches[0].1, 2);
+        assert_eq!(batches[1].0, "3:4");
+        assert_eq!(batches[1].1, 2);
+        assert_eq!(batches[2].0, "5");
+        assert_eq!(batches[2].1, 1);
+    }
+}

crates/core/src/import/mod.rs

@@ -105,6 +105,7 @@ impl ImportEmls {
                     unseen: None,
                     uid_next: None,
                     uid_validity: None,
+                    highest_uid: None,
                 };
                 let mailbox_id = mailbox.id;
                 // Upsert the mailbox, creating it if it doesn't exist

crates/core/src/lib.rs

@@ -1,4 +1,5 @@
 pub mod account;
+pub mod ext;
 pub mod admin;
 pub mod autoconfig;
 pub mod cache;

crates/core/src/mailbox/list.rs

@@ -157,8 +157,13 @@ async fn fetch_remote_with_progress(account_id: u64) -> BichonResult<Vec<MailBox
 
         mailbox.account_id = account_id;
         mailbox.id = create_hash(account_id, &mailbox.name);
+        // Use STATUS instead of EXAMINE: gets MESSAGES/UNSEEN/UIDNEXT/UIDVALIDITY
+        // without selecting the mailbox, avoiding context switches.
         let mx = session
-            .examine(mailbox_name.as_str())
+            .status(
+                mailbox_name.as_str(),
+                "(MESSAGES UNSEEN UIDNEXT UIDVALIDITY)",
+            )
             .await
             .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed))?;
         mailbox.exists = mx.exists;
@@ -205,8 +210,13 @@ pub async fn convert_names_to_mailboxes(
 
         mailbox.account_id = account_id;
         mailbox.id = create_hash(account_id, &mailbox.name);
+        // Use STATUS instead of EXAMINE: gets MESSAGES/UNSEEN/UIDNEXT/UIDVALIDITY
+        // without selecting the mailbox, avoiding context switches.
         let mx = session
-            .examine(mailbox_name.as_str())
+            .status(
+                mailbox_name.as_str(),
+                "(MESSAGES UNSEEN UIDNEXT UIDVALIDITY)",
+            )
             .await
             .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::ImapCommandFailed))?;
         mailbox.exists = mx.exists;

crates/core/src/message/content.rs

@@ -47,6 +47,14 @@ pub struct AttachmentInfo {
     /// Hash of the content.
     pub content_hash: String,
     pub is_message: bool,
+    /// Text extracted from the attachment body (Pro/Enterprise feature).
+    /// Populated during IMAP sync; None for inline attachments and unsupported file types.
+    pub extracted_text: Option<String>,
+    /// Page count reported by the extractor, if any.
+    pub extracted_page_count: Option<u32>,
+    /// Whether the extracted text came from OCR.
+    #[serde(default)]
+    pub extracted_is_ocr: bool,
 }
 
 impl AttachmentInfo {
@@ -198,7 +206,9 @@ pub fn retrieve_email_content(
             content_type.c_subtype.as_deref().unwrap_or("")
         );
 
-        let inline = disposition.map(|d| d.is_inline()).unwrap_or(false);
+        let inline = disposition
+            .map(|d| d.is_inline())
+            .unwrap_or_else(|| attachment.content_id().is_some());
 
         if inline {
             if let Some(html1) = html.as_deref() {
@@ -222,13 +232,16 @@ pub fn retrieve_email_content(
         let is_message = attachment.is_message();
         let content_hash = compute_content_hash(attachment.contents());
         attachments.push(AttachmentInfo {
-            filename: filename.or(Some(content_hash.clone())), //  Fallback to content_hash as the default filename if it is not provided.
+            filename: filename.or(Some(content_hash.clone())),
             size: attachment.contents().len(),
             inline,
             file_type,
             is_message,
             content_hash,
             content_id: attachment.content_id().map(Into::into),
+            extracted_text: None,
+            extracted_page_count: None,
+            extracted_is_ocr: false,
         });
     }
     let mut has_remote_content = false;
@@ -291,7 +304,9 @@ pub fn retrieve_nested_eml_content(
     for attachment in nested_message.attachments() {
         let cid = attachment.content_id();
         let disposition = attachment.content_disposition();
-        let is_inline = disposition.map(|d| d.is_inline()).unwrap_or(false);
+        let is_inline = disposition
+            .map(|d| d.is_inline())
+            .unwrap_or_else(|| cid.is_some());
 
         if has_html && is_inline && cid.is_some() {
             let content_id = cid.unwrap();
@@ -320,13 +335,16 @@ pub fn retrieve_nested_eml_content(
             filename: attachment
                 .attachment_name()
                 .map(|n| n.to_string())
-                .or(Some(content_hash.clone())), // Fallback to content_hash as the default filename if it is not provided.
+                .or(Some(content_hash.clone())),
             size: attachment.contents().len(),
             inline: is_inline,
             file_type,
             content_hash,
             is_message: attachment.is_message(),
             content_id: cid.map(Into::into),
+            extracted_text: None,
+            extracted_page_count: None,
+            extracted_is_ocr: false,
         });
     }
 
@@ -348,3 +366,102 @@ pub fn retrieve_nested_eml_content(
         has_remote_content,
     })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Simulates JSON written by a version before `extracted_text`, `extracted_page_count`,
+    /// and `extracted_is_ocr` were added to [`AttachmentInfo`]. Deserialization must
+    /// succeed and fill the missing fields with their defaults.
+    #[test]
+    fn attachment_info_backward_compat_no_extracted_fields() {
+        let old_json = r#"[
+            {
+                "file_type": "application/pdf",
+                "inline": false,
+                "filename": "report.pdf",
+                "size": 12345,
+                "content_id": null,
+                "content_hash": "abc123",
+                "is_message": false
+            },
+            {
+                "file_type": "image/png",
+                "inline": true,
+                "filename": "logo.png",
+                "size": 6789,
+                "content_id": "cid:logo@example.com",
+                "content_hash": "def456",
+                "is_message": false
+            }
+        ]"#;
+
+        let attachments: Vec<AttachmentInfo> =
+            serde_json::from_str(old_json).expect("should deserialize legacy JSON");
+
+        assert_eq!(attachments.len(), 2);
+
+        // First attachment (regular file)
+        assert_eq!(attachments[0].file_type, "application/pdf");
+        assert!(!attachments[0].inline);
+        assert_eq!(attachments[0].filename.as_deref(), Some("report.pdf"));
+        assert_eq!(attachments[0].size, 12345);
+        assert_eq!(attachments[0].content_id, None);
+        assert_eq!(attachments[0].content_hash, "abc123");
+        assert!(!attachments[0].is_message);
+        // Fields added after the legacy format — must default correctly
+        assert_eq!(attachments[0].extracted_text, None);
+        assert_eq!(attachments[0].extracted_page_count, None);
+        assert!(!attachments[0].extracted_is_ocr);
+
+        // Second attachment (inline image with content-id)
+        assert_eq!(attachments[1].file_type, "image/png");
+        assert!(attachments[1].inline);
+        assert_eq!(attachments[1].filename.as_deref(), Some("logo.png"));
+        assert_eq!(attachments[1].size, 6789);
+        assert_eq!(attachments[1].content_id.as_deref(), Some("cid:logo@example.com"));
+        assert_eq!(attachments[1].content_hash, "def456");
+        assert!(!attachments[1].is_message);
+        assert_eq!(attachments[1].extracted_text, None);
+        assert_eq!(attachments[1].extracted_page_count, None);
+        assert!(!attachments[1].extracted_is_ocr);
+    }
+
+    /// Current struct must round-trip through serde_json without data loss.
+    #[test]
+    fn attachment_info_round_trip() {
+        let attachments = vec![
+            AttachmentInfo {
+                file_type: "text/html".into(),
+                inline: false,
+                filename: Some("page.html".into()),
+                size: 42,
+                content_id: None,
+                content_hash: "hash1".into(),
+                is_message: true,
+                extracted_text: Some("hello world".into()),
+                extracted_page_count: Some(1),
+                extracted_is_ocr: false,
+            },
+            AttachmentInfo {
+                file_type: "application/zip".into(),
+                inline: false,
+                filename: Some("archive.zip".into()),
+                size: 99999,
+                content_id: None,
+                content_hash: "hash2".into(),
+                is_message: false,
+                extracted_text: None,
+                extracted_page_count: None,
+                extracted_is_ocr: true,
+            },
+        ];
+
+        let json = serde_json::to_string(&attachments).expect("serialize");
+        let round_tripped: Vec<AttachmentInfo> =
+            serde_json::from_str(&json).expect("deserialize");
+
+        assert_eq!(attachments, round_tripped);
+    }
+}

crates/core/src/migrate/store.rs

@@ -86,13 +86,22 @@ pub fn detach_attachments_standalone(
 
     for (raw_start, raw_end, att) in ranges {
         let content_hash = compute_content_hash(att.contents());
-        blobs.push((
-            content_hash.clone(),
-            Bytes::copy_from_slice(&original_body[raw_start..raw_end]),
-        ));
+        let body_len = original_body.len();
+        let raw_start = raw_start.min(body_len);
+        let raw_end = raw_end.min(body_len);
+        let range_valid = raw_start < raw_end;
 
-        let placeholder = format!("<<BICHON_DETACH_HASH:{}>>", &content_hash);
-        stripped_eml.splice(raw_start..raw_end, placeholder.as_bytes().iter().cloned());
+        if range_valid {
+            blobs.push((
+                content_hash.clone(),
+                Bytes::copy_from_slice(&original_body[raw_start..raw_end]),
+            ));
+        }
+
+        if range_valid {
+            let placeholder = format!("<<BICHON_DETACH_HASH:{}>>", &content_hash);
+            stripped_eml.splice(raw_start..raw_end, placeholder.as_bytes().iter().cloned());
+        }
 
         infos.push(AttachmentInfo {
             filename: att.attachment_name().map(|n| n.to_string()),
@@ -100,7 +109,7 @@ pub fn detach_attachments_standalone(
             inline: att
                 .content_disposition()
                 .map(|d| d.is_inline())
-                .unwrap_or(false),
+                .unwrap_or_else(|| att.content_id().is_some()),
             file_type: att
                 .content_type()
                 .map(|ct| {
@@ -114,6 +123,9 @@ pub fn detach_attachments_standalone(
             content_id: att.content_id().map(|id| id.to_string()),
             content_hash,
             is_message: att.is_message(),
+            extracted_text: None,
+            extracted_page_count: None,
+            extracted_is_ocr: false,
         });
     }
 

crates/core/src/store/blob.rs

@@ -149,9 +149,18 @@ impl BlobManager {
                     res = receiver.recv() => {
                         match res {
                             Some(eml) => {
-                                Self::process_detached_email(eml, &email_ks, &attach_ks);
+                                let mut batch = vec![eml];
                                 while let Ok(next_eml) = receiver.try_recv() {
-                                    Self::process_detached_email(next_eml, &email_ks, &attach_ks);
+                                    batch.push(next_eml);
+                                }
+                                let email_ks = email_ks.clone();
+                                let attach_ks = attach_ks.clone();
+                                if let Err(e) = tokio::task::spawn_blocking(move || {
+                                    for eml in batch {
+                                        Self::process_detached_email(eml, &email_ks, &attach_ks);
+                                    }
+                                }).await {
+                                    tracing::error!("BlobManager: spawn_blocking join error: {:#?}", e);
                                 }
                             }
                             None => {
@@ -162,16 +171,25 @@ impl BlobManager {
                     }
                     _ = shutdown.recv() => {
                         receiver.close();
-                        let remaining = receiver.len();
+                        let mut remaining = Vec::new();
+                        while let Some(eml) = receiver.recv().await {
+                            remaining.push(eml);
+                        }
                         tracing::info!(
                             "BlobManager: Shutdown signal received. Processing {} remaining tasks...",
-                            remaining
+                            remaining.len()
                         );
-
-                        while let Some(eml) = receiver.recv().await {
-                            Self::process_detached_email(eml, &email_ks, &attach_ks);
+                        if !remaining.is_empty() {
+                            let email_ks = email_ks.clone();
+                            let attach_ks = attach_ks.clone();
+                            if let Err(e) = tokio::task::spawn_blocking(move || {
+                                for eml in remaining {
+                                    Self::process_detached_email(eml, &email_ks, &attach_ks);
+                                }
+                            }).await {
+                                tracing::error!("BlobManager: shutdown spawn_blocking join error: {:#?}", e);
+                            }
                         }
-
                         tracing::info!("BlobManager: All remaining tasks processed. Closing Fjall.");
                         break;
                     }

crates/core/src/store/tantivy/attachment.rs

@@ -154,7 +154,11 @@ impl IndexManager {
                                         "Tantivy: Reached threshold ({} docs), committing...",
                                         pending_count
                                     );
-                                    fatal_commit(&mut writer);
+                                    tokio::task::block_in_place(|| fatal_commit(&mut writer));
+                                    tracing::debug!(
+                                        "Tantivy attach: committed {} docs, pending reset to 0",
+                                        pending_count
+                                    );
                                     pending_count = 0;
                                     commit_interval.reset();
                                 }
@@ -163,7 +167,7 @@ impl IndexManager {
                                 tracing::info!("Tantivy: Receiver closed. Finalizing...");
                                 if pending_count > 0 {
                                     let mut writer = writer.lock().await;
-                                    fatal_commit(&mut writer);
+                                    tokio::task::block_in_place(|| fatal_commit(&mut writer));
                                 }
                                 break;
                             },
@@ -172,16 +176,19 @@ impl IndexManager {
                     _ = commit_interval.tick() => {
                         if pending_count > 0 {
                             let mut writer = writer.lock().await;
-                            fatal_commit(&mut writer);
+                            tracing::debug!(
+                                "Tantivy attach: periodic commit ({} docs pending)",
+                                pending_count
+                            );
+                            tokio::task::block_in_place(|| fatal_commit(&mut writer));
                             pending_count = 0;
-                            tracing::debug!("Tantivy: Periodic commit finished.");
                         }
                     }
                     _ = shutdown.recv() => {
                         tracing::info!("Tantivy: Shutdown signal received. Performing final commit...");
                         if pending_count > 0 {
                             let mut writer = writer.lock().await;
-                            fatal_commit(&mut writer);
+                            tokio::task::block_in_place(|| fatal_commit(&mut writer));
                         }
                         tracing::info!("Tantivy: Shutdown cleanup complete.");
                         break;

crates/core/src/store/tantivy/dedup.rs

@@ -255,11 +255,22 @@ fn dedup_account(
         // uidvalidity, which is required for correct incremental sync.
         entries.sort_by_key(|e| std::cmp::Reverse(e.ingest_at));
 
-        eprintln!(
-            "DEBUG Phase2: key={_key:?} kept={} deleting={}",
-            entries[0].email_id,
+        tracing::debug!(
+            "dedup: account={} mailbox={} hash={}: {} copies, keeping eid={} ingest_at={}, deleting {}",
+            account_id,
+            _key.0,
+            &_key.1,
+            entries.len(),
+            &entries[0].email_id,
+            entries[0].ingest_at,
             entries.len() - 1
         );
+
+        // eprintln!(
+        //     "DEBUG Phase2: key={_key:?} kept={} deleting={}",
+        //     entries[0].email_id,
+        //     entries.len() - 1
+        // );
         // Keep entries[0], soft-delete everything else via term query on f_id
         for entry in &entries[1..] {
             eprintln!(

crates/core/src/store/tantivy/envelope.rs

@@ -169,7 +169,11 @@ impl IndexManager {
                                         "Tantivy: Reached threshold ({} docs), committing...",
                                         pending_count
                                     );
-                                    fatal_commit(&mut writer);
+                                    tokio::task::block_in_place(|| fatal_commit(&mut writer));
+                                    tracing::debug!(
+                                        "Tantivy: committed {} docs, pending reset to 0",
+                                        pending_count
+                                    );
                                     pending_count = 0;
                                     commit_interval.reset();
                                 }
@@ -178,7 +182,7 @@ impl IndexManager {
                                 tracing::info!("Tantivy: Receiver closed. Finalizing...");
                                 if pending_count > 0 {
                                     let mut writer = writer.lock().await;
-                                    fatal_commit(&mut writer);
+                                    tokio::task::block_in_place(|| fatal_commit(&mut writer));
                                 }
                                 break;
                             },
@@ -187,16 +191,19 @@ impl IndexManager {
                     _ = commit_interval.tick() => {
                         if pending_count > 0 {
                             let mut writer = writer.lock().await;
-                            fatal_commit(&mut writer);
+                            tracing::debug!(
+                                "Tantivy: periodic commit ({} docs pending)",
+                                pending_count
+                            );
+                            tokio::task::block_in_place(|| fatal_commit(&mut writer));
                             pending_count = 0;
-                            tracing::debug!("Tantivy: Periodic commit finished.");
                         }
                     }
                     _ = shutdown.recv() => {
                         tracing::info!("Tantivy: Shutdown signal received. Performing final commit...");
                         if pending_count > 0 {
                             let mut writer = writer.lock().await;
-                            fatal_commit(&mut writer);
+                            tokio::task::block_in_place(|| fatal_commit(&mut writer));
                         }
                         tracing::info!("Tantivy: Shutdown cleanup complete.");
                         break;
@@ -690,7 +697,15 @@ impl IndexManager {
         let agg_res = searcher
             .search(query.as_ref(), &collector)
             .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::InternalError))?;
-        Ok(Self::extract_max_uid(&agg_res))
+        let result = Self::extract_max_uid(&agg_res);
+        tracing::debug!(
+            "[account {}][mailbox {}] get_max_uid = {:?} (num_docs in searcher = {})",
+            account_id,
+            mailbox_id,
+            result,
+            searcher.num_docs()
+        );
+        Ok(result)
     }
 
     pub fn get_account_stats(&self, account_id: u64) -> BichonResult<AccountStats> {

crates/server/Cargo.toml

@@ -3,6 +3,10 @@ name = "bichon-server"
 version.workspace = true
 edition.workspace = true
 
+[features]
+default = ["embed-web"]
+embed-web = ["dep:rust-embed"]
+
 
 [dependencies]
 bichon-core = { path = "../core", features = ["web-api"] }
@@ -17,7 +21,7 @@ poem-openapi = { version = "5.1.16", features = [
     "swagger-ui",
     "email",
 ] }
-rust-embed = "8.11.0"
+rust-embed = { version = "8.11.0", optional = true }
 email_address.workspace = true
 serde.workspace = true
 serde_json.workspace = true
@@ -29,7 +33,6 @@ tracing.workspace = true
 tokio.workspace = true
 http.workspace = true
 urlencoding.workspace = true
-mimalloc.workspace = true
 
 [dev-dependencies]
 poem = { version = "3.1.12", features = ["test"] }

crates/server/src/lib.rs

@@ -0,0 +1,135 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+pub mod common;
+pub mod error;
+pub mod rest;
+
+use std::sync::LazyLock;
+
+use bichon_core::{
+    bichon_version,
+    cache::imap::task::SYNC_TASKS,
+    common::{rustls::BichonTls, signal::SignalManager},
+    context::{executors::BichonContext, Initialize},
+    database::manager::DB_MANAGER,
+    error::{code::ErrorCode, BichonResult},
+    logger,
+    migrate::check_data_status,
+    raise_error,
+    settings::{cli::SETTINGS, dir::DataDirManager},
+    store::{
+        blob::BLOB_MANAGER,
+        tantivy::{attachment::ATTACHMENT_MANAGER, envelope::ENVELOPE_MANAGER},
+    },
+    tasks::PeriodicTasks,
+    users::manager::UserManager,
+};
+use bichon_smtp::server::{start_smtp_server, SmtpServer};
+use tracing::{error, info};
+
+pub async fn run() -> BichonResult<()> {
+    logger::initialize_logging();
+    info!(
+        r#"
+     _      _        _
+    | |    (_)      | |
+    | |__   _   ___ | |__    ___   _ __
+    | '_ \ | | / __|| '_ \  / _ \ | '_ \
+    | |_) || || (__ | | | || (_) || | | |
+    |_.__/ |_| \___||_| |_| \___/ |_| |_|
+
+    "#
+    );
+    info!("Starting bichon-server");
+    info!("Version:  {}", bichon_version!());
+    info!("Git:      [{}]", env!("GIT_HASH"));
+    info!("GitHub:   https://github.com/rustmailer/bichon");
+
+    match check_data_status() {
+        Ok(false) => {
+            error!("Incompatible data format detected.");
+            error!("Your data was created by an older version of Bichon and must be migrated before use.");
+            error!("Please stop the Bichon v0.3.7 service before migration.");
+            error!("Please run: bichon-admin");
+            error!("Documentation: https://github.com/rustmailer/bichon/wiki/Bichon-Data-Migration:-v0.3.7-%E2%86%92-v1.0");
+            return Err(raise_error!(
+                "Legacy data layout detected".into(),
+                ErrorCode::InternalError
+            ));
+        }
+        Err(e) => {
+            error!("Failed to check data layout: {:#?}", e);
+            return Err(raise_error!(format!("{:#?}", e), ErrorCode::InternalError));
+        }
+        Ok(true) => {}
+    }
+
+    if let Err(error) = initialize().await {
+        eprintln!("{:?}", error);
+        return Err(error);
+    }
+
+    let periodic_tasks = PeriodicTasks::setup();
+    let mut smtp_service: Option<SmtpServer> = None;
+    if SETTINGS.bichon_enable_smtp {
+        info!("SMTP service is enabled, starting...");
+        match start_smtp_server().await {
+            Ok(server) => {
+                info!("SMTP server listening on: {}", server.smtp_addr);
+                smtp_service = Some(server);
+            }
+            Err(e) => {
+                error!("Failed to start SMTP server: {}", e);
+                return Err(raise_error!(format!("{:#?}", e), ErrorCode::InternalError));
+            }
+        }
+    } else {
+        info!("SMTP service is disabled by configuration.");
+    }
+
+    rest::start_http_server().await?;
+    periodic_tasks.shutdown().await;
+
+    if let Some(server) = smtp_service {
+        info!("Shutting down SMTP server...");
+        server.stop().await;
+        info!("SMTP server stopped.");
+    }
+
+    SYNC_TASKS.shutdown().await;
+    ENVELOPE_MANAGER.shutdown().await;
+    ATTACHMENT_MANAGER.shutdown().await;
+    BLOB_MANAGER.shutdown().await;
+    DB_MANAGER.flush();
+    info!("Bichon server stopped.");
+    Ok(())
+}
+
+async fn initialize() -> BichonResult<()> {
+    SignalManager::initialize().await?;
+    DataDirManager::initialize().await?;
+    UserManager::initialize().await?;
+    BichonTls::initialize().await?;
+    BichonContext::initialize().await?;
+    LazyLock::force(&BLOB_MANAGER);
+    LazyLock::force(&ENVELOPE_MANAGER);
+    LazyLock::force(&ATTACHMENT_MANAGER);
+    Ok(())
+}

crates/server/src/main.rs

@@ -16,205 +16,9 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-use std::sync::LazyLock;
+use bichon_core::error::BichonResult;
 
-use bichon_core::{
-    bichon_version,
-    cache::imap::task::SYNC_TASKS,
-    common::rustls::BichonTls,
-    context::{executors::BichonContext, Initialize},
-    error::{code::ErrorCode, BichonResult},
-    logger,
-    migrate::check_data_status,
-    raise_error,
-    settings::cli::SETTINGS,
-    store::{
-        blob::BLOB_MANAGER,
-        tantivy::{attachment::ATTACHMENT_MANAGER, envelope::ENVELOPE_MANAGER},
-    },
-    tasks::PeriodicTasks,
-};
-use bichon_smtp::server::{start_smtp_server, SmtpServer};
-use mimalloc::MiMalloc;
-use tracing::{error, info};
-
-use bichon_core::{
-    common::signal::SignalManager, settings::dir::DataDirManager, users::manager::UserManager,
-};
-
-use crate::rest::start_http_server;
-
-pub mod common;
-pub mod error;
-pub mod rest;
-
-#[global_allocator]
-static GLOBAL: MiMalloc = MiMalloc;
-
-static LOGO: &str = r#"
- _      _        _                   
-| |    (_)      | |                  
-| |__   _   ___ | |__    ___   _ __  
-| '_ \ | | / __|| '_ \  / _ \ | '_ \ 
-| |_) || || (__ | | | || (_) || | | |
-|_.__/ |_| \___||_| |_| \___/ |_| |_|
-                                     
-"#;
 #[tokio::main]
 async fn main() -> BichonResult<()> {
-    logger::initialize_logging();
-    info!("{}", LOGO);
-    info!("Starting bichon-server");
-    info!("Version:  {}", bichon_version!());
-    info!("Git:      [{}]", env!("GIT_HASH"));
-    info!("GitHub:   https://github.com/rustmailer/bichon");
-
-    match check_data_status() {
-        Ok(false) => {
-            error!("Incompatible data format detected.");
-            error!("Your data was created by an older version of Bichon and must be migrated before use.");
-            error!("Please stop the Bichon v0.3.7 service before migration.");
-            error!("Please run: bichon-admin");
-            error!("Documentation: https://github.com/rustmailer/bichon/wiki/Bichon-Data-Migration:-v0.3.7-%E2%86%92-v1.0");
-            return Err(raise_error!(
-                "Legacy data layout detected".into(),
-                ErrorCode::InternalError
-            ));
-        }
-        Err(e) => {
-            error!("Failed to check data layout: {:#?}", e);
-            return Err(raise_error!(format!("{:#?}", e), ErrorCode::InternalError));
-        }
-        Ok(true) => {}
-    }
-
-    if let Err(error) = initialize().await {
-        eprintln!("{:?}", error);
-        return Err(error);
-    }
-
-    let periodic_tasks = PeriodicTasks::setup();
-    let mut smtp_service: Option<SmtpServer> = None;
-    if SETTINGS.bichon_enable_smtp {
-        info!("SMTP service is enabled, starting...");
-        match start_smtp_server().await {
-            Ok(server) => {
-                info!("SMTP server listening on: {}", server.smtp_addr);
-                smtp_service = Some(server);
-            }
-            Err(e) => {
-                error!("Failed to start SMTP server: {}", e);
-                return Err(raise_error!(format!("{:#?}", e), ErrorCode::InternalError));
-            }
-        }
-    } else {
-        info!("SMTP service is disabled by configuration.");
-    }
-
-    start_http_server().await?;
-    periodic_tasks.shutdown().await;
-
-    if let Some(server) = smtp_service {
-        info!("Shutting down SMTP server...");
-        server.stop().await;
-        info!("SMTP server stopped.");
-    }
-
-    SYNC_TASKS.shutdown().await;
-    ENVELOPE_MANAGER.shutdown().await;
-    ATTACHMENT_MANAGER.shutdown().await;
-    BLOB_MANAGER.shutdown().await;
-    info!("Bichon server stopped.");
-    Ok(())
-}
-
-/// Initialize the system by validating settings and starting necessary tasks.
-async fn initialize() -> BichonResult<()> {
-    SignalManager::initialize().await?;
-    DataDirManager::initialize().await?;
-    UserManager::initialize().await?;
-    BichonTls::initialize().await?;
-    BichonContext::initialize().await?;
-    LazyLock::force(&BLOB_MANAGER);
-    LazyLock::force(&ENVELOPE_MANAGER);
-    LazyLock::force(&ATTACHMENT_MANAGER);
-    Ok(())
-}
-
-#[cfg(test)]
-mod tests;
-
-#[cfg(test)]
-mod api_tests {
-    use super::rest::api::create_openapi_service;
-    use poem::test::TestClient;
-
-    #[tokio::test]
-    async fn openapi_spec_json_is_served() {
-        let api_service = create_openapi_service();
-        let spec_endpoint = api_service.spec_endpoint();
-        let cli = TestClient::new(spec_endpoint);
-
-        let resp = cli.get("/").send().await;
-        resp.assert_status_is_ok();
-
-        let body = resp.json().await;
-        let obj = body.value().object();
-        assert!(obj.get_opt("openapi").is_some(), "missing openapi version");
-        assert!(obj.get_opt("info").is_some(), "missing info section");
-        assert!(obj.get_opt("paths").is_some(), "missing paths section");
-    }
-
-    #[tokio::test]
-    async fn openapi_spec_yaml_is_served() {
-        let api_service = create_openapi_service();
-        let spec_endpoint = api_service.spec_endpoint_yaml();
-        let cli = TestClient::new(spec_endpoint);
-
-        let resp = cli.get("/").send().await;
-        resp.assert_status_is_ok();
-    }
-
-    #[tokio::test]
-    async fn swagger_ui_is_served() {
-        let api_service = create_openapi_service();
-        let swagger = api_service.swagger_ui();
-        let cli = TestClient::new(swagger);
-
-        let resp = cli.get("/").send().await;
-        resp.assert_status_is_ok();
-    }
-
-    #[tokio::test]
-    async fn openapi_spec_lists_all_tag_groups() {
-        let api_service = create_openapi_service();
-        let spec_endpoint = api_service.spec_endpoint();
-        let cli = TestClient::new(spec_endpoint);
-
-        let resp = cli.get("/").send().await;
-        let body = resp.json().await;
-        let value = body.value();
-
-        let tag_names: Vec<&str> = value
-            .object()
-            .get("tags")
-            .array()
-            .iter()
-            .map(|v| v.object().get("name").string())
-            .collect();
-
-        assert!(
-            tag_names.contains(&"AccessToken"),
-            "missing AccessToken tag"
-        );
-        assert!(tag_names.contains(&"Attachment"), "missing Attachment tag");
-        assert!(tag_names.contains(&"AutoConfig"), "missing AutoConfig tag");
-        assert!(tag_names.contains(&"Account"), "missing Account tag");
-        assert!(tag_names.contains(&"System"), "missing System tag");
-        assert!(tag_names.contains(&"Mailbox"), "missing Mailbox tag");
-        assert!(tag_names.contains(&"OAuth2"), "missing OAuth2 tag");
-        assert!(tag_names.contains(&"Message"), "missing Message tag");
-        assert!(tag_names.contains(&"Import"), "missing Import tag");
-        assert!(tag_names.contains(&"Users"), "missing Users tag");
-    }
+    bichon_server::run().await
 }

crates/server/src/rest/assets.rs

@@ -1,24 +1,11 @@
-//
-// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
-//
-// This file is part of the Bichon Email Archiving Project
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Affero General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU Affero General Public License for more details.
-//
-// You should have received a copy of the GNU Affero General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#[cfg(feature = "embed-web")]
+mod inner {
+    use rust_embed::RustEmbed;
 
+    #[derive(RustEmbed)]
+    #[folder = "../../web/dist/"]
+    pub struct FrontEndAssets;
+}
 
-use rust_embed::RustEmbed;
-
-#[derive(RustEmbed)]
-#[folder = "../../web/dist/"]
-pub struct FrontEndAssets;
+#[cfg(feature = "embed-web")]
+pub use inner::FrontEndAssets;

crates/server/src/rest/mod.rs

@@ -16,51 +16,49 @@
 // You should have received a copy of the GNU Affero General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+use crate::common::auth::ApiGuard;
 use crate::common::error::ErrorCapture;
 use crate::common::log::Tracing;
 use crate::common::tls::rustls_config;
+use crate::common::timeout::{Timeout, TIMEOUT_HEADER};
 use crate::error::handler::error_handler;
+use crate::rest::public::features::get_features;
 use crate::rest::public::login::login;
 use crate::rest::public::status::get_status;
 use bichon_core::common::signal::SIGNAL_MANAGER;
 use bichon_core::error::code::ErrorCode;
 use bichon_core::error::BichonResult;
+use bichon_core::raise_error;
 use bichon_core::settings::cli::SETTINGS;
 
-use super::error::ApiErrorResponse;
-use crate::common::auth::ApiGuard;
-use crate::common::timeout::{Timeout, TIMEOUT_HEADER};
 use api::create_openapi_service;
-use assets::FrontEndAssets;
-use bichon_core::raise_error;
-use http::{HeaderValue, Method};
-use poem::endpoint::EmbeddedFilesEndpoint;
+use http::Method;
 use poem::listener::{Listener, TcpListener};
-use poem::middleware::{CatchPanic, Compression, SetHeader};
-use poem::{get, handler, post, IntoResponse};
-use poem::{middleware::Cors, EndpointExt, Route, Server};
+use poem::middleware::{CatchPanic, Compression, Cors};
+use poem::{get, post, Endpoint, EndpointExt, Route, Server};
 use public::oauth2::oauth2_callback;
 use std::collections::HashSet;
 use std::time::Duration;
 
+#[cfg(feature = "embed-web")]
+use {
+    assets::FrontEndAssets,
+    http::HeaderValue,
+    poem::{handler, endpoint::EmbeddedFilesEndpoint, IntoResponse},
+    poem::middleware::SetHeader,
+};
+
 pub mod api;
 pub mod assets;
 pub mod public;
 
 pub type ApiResult<T, E = ApiErrorResponse> = std::result::Result<T, E>;
 
-pub async fn start_http_server() -> BichonResult<()> {
-    let listener = TcpListener::bind((
-        SETTINGS.bichon_bind_ip.clone().unwrap_or("0.0.0.0".into()),
-        SETTINGS.bichon_http_port as u16,
-    ));
-
-    let listener = if SETTINGS.bichon_enable_rest_https {
-        listener.rustls(rustls_config()?).boxed()
-    } else {
-        listener.boxed()
-    };
+use super::error::ApiErrorResponse;
 
+/// Build the community route tree. Pro/Enterprise servers can call this
+/// and then add their own routes before passing the tree to the server.
+pub fn build_routes() -> impl Endpoint {
     let api_service = create_openapi_service()
         .summary("A lightweight, high-performance Rust email archiver with WebUI");
 
@@ -79,7 +77,6 @@ pub async fn start_http_server() -> BichonResult<()> {
         .with(Tracing);
 
     let cors_origins: Option<HashSet<String>> = SETTINGS.bichon_cors_origins.clone();
-
     let cors_origins: Vec<String> = cors_origins.unwrap_or_default().into_iter().collect();
 
     let cors = Cors::new()
@@ -92,7 +89,6 @@ pub async fn start_http_server() -> BichonResult<()> {
             }
             cors_origins.iter().any(|o| o == origin)
         })
-        //.allow_origins(cors_origins)
         .allow_credentials(true)
         .allow_methods(&[
             Method::GET,
@@ -107,13 +103,6 @@ pub async fn start_http_server() -> BichonResult<()> {
         .expose_headers(vec!["Accept"])
         .max_age(SETTINGS.bichon_cors_max_age);
 
-    let cache_static = || {
-        SetHeader::new().overriding(
-            http::header::CACHE_CONTROL,
-            HeaderValue::from_static("max-age=86400"),
-        )
-    };
-
     let app_logic = Route::new()
         .nest("/api-docs/swagger", swagger)
         .nest("/api-docs/redoc", redoc)
@@ -122,42 +111,43 @@ pub async fn start_http_server() -> BichonResult<()> {
         .nest("/api-docs/spec.json", spec_json)
         .nest("/api-docs/spec.yaml", spec_yaml)
         .nest("/oauth2/callback", get(oauth2_callback))
+        .nest("/api/v1/features", get(get_features))
         .nest("/api/status", get(get_status))
         .nest("/api/login", post(login))
-        .nest_no_strip("/api/v1", open_api_route)
+        .nest_no_strip("/api/v1", open_api_route);
+
+    let app_logic = add_web_assets(app_logic);
+
+    Route::new()
+        .nest(&SETTINGS.bichon_base_url, app_logic)
+        .with(cors)
+        .with_if(SETTINGS.bichon_http_compression_enabled, Compression::new())
+        .with(CatchPanic::new())
+}
+
+#[cfg(feature = "embed-web")]
+fn add_web_assets(route: Route) -> impl Endpoint {
+    let cache_static = || {
+        SetHeader::new().overriding(
+            http::header::CACHE_CONTROL,
+            HeaderValue::from_static("max-age=86400"),
+        )
+    };
+
+    route
         .nest_no_strip(
             "/assets",
             EmbeddedFilesEndpoint::<FrontEndAssets>::new().with(cache_static()),
         )
-        .at("/*", serve_index_with_base);
-
-    let route = Route::new()
-        .nest(&SETTINGS.bichon_base_url, app_logic)
-        .with(cors)
-        .with_if(SETTINGS.bichon_http_compression_enabled, Compression::new())
-        .with(CatchPanic::new());
-
-    let mut rx = SIGNAL_MANAGER.subscribe();
-    let shutdown_fut = async move {
-        let _ = rx.recv().await;
-    };
-    let server = Server::new(listener)
-        .name("Bichon Service")
-        .idle_timeout(Duration::from_secs(60))
-        .run_with_graceful_shutdown(
-            route.catch_all_error(error_handler),
-            shutdown_fut,
-            Some(Duration::from_secs(5)),
-        );
-    println!(
-        "Bichon Service is now running on port {}.",
-        SETTINGS.bichon_http_port
-    );
-    server
-        .await
-        .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::InternalError))
+        .at("/*", serve_index_with_base)
 }
 
+#[cfg(not(feature = "embed-web"))]
+fn add_web_assets(route: Route) -> Route {
+    route
+}
+
+#[cfg(feature = "embed-web")]
 #[handler]
 async fn serve_index_with_base() -> impl IntoResponse {
     let mut html =
@@ -180,3 +170,38 @@ async fn serve_index_with_base() -> impl IntoResponse {
         .content_type("text/html; charset=utf-8")
         .body(html)
 }
+
+pub async fn start_http_server() -> BichonResult<()> {
+    let listener = TcpListener::bind((
+        SETTINGS.bichon_bind_ip.clone().unwrap_or("0.0.0.0".into()),
+        SETTINGS.bichon_http_port as u16,
+    ));
+
+    let listener = if SETTINGS.bichon_enable_rest_https {
+        listener.rustls(rustls_config()?).boxed()
+    } else {
+        listener.boxed()
+    };
+
+    let route = build_routes();
+
+    let mut rx = SIGNAL_MANAGER.subscribe();
+    let shutdown_fut = async move {
+        let _ = rx.recv().await;
+    };
+    let server = Server::new(listener)
+        .name("Bichon Service")
+        .idle_timeout(Duration::from_secs(60))
+        .run_with_graceful_shutdown(
+            route.catch_all_error(error_handler),
+            shutdown_fut,
+            Some(Duration::from_secs(5)),
+        );
+    println!(
+        "Bichon Service is now running on port {}.",
+        SETTINGS.bichon_http_port
+    );
+    server
+        .await
+        .map_err(|e| raise_error!(format!("{:#?}", e), ErrorCode::InternalError))
+}

crates/server/src/rest/public/features.rs

@@ -0,0 +1,36 @@
+//
+// Copyright (c) 2025-2026 rustmailer.com (https://rustmailer.com)
+//
+// This file is part of the Bichon Email Archiving Project
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+use poem::{handler, web::Json, IntoResponse};
+use serde::Serialize;
+
+#[derive(Serialize)]
+struct FeaturesResponse {
+    features: Vec<String>,
+    edition: &'static str,
+    version: String,
+}
+
+#[handler]
+pub async fn get_features() -> impl IntoResponse {
+    Json(FeaturesResponse {
+        features: vec![],
+        edition: "community",
+        version: env!("CARGO_PKG_VERSION").to_string(),
+    })
+}

crates/server/src/rest/public/mod.rs

@@ -17,6 +17,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+pub mod features;
 pub mod login;
 pub mod oauth2;
 pub mod status;

crates/smtp/src/server.rs

@@ -628,6 +628,7 @@ async fn parse_email(data: &[u8], session: &Session) -> BichonResult<()> {
         unseen: None,
         uid_next: None,
         uid_validity: None,
+        highest_uid: None,
     };
     let mailbox_id = mailbox.id;
 

web/src/api/account/api.ts

@@ -128,7 +128,6 @@ export interface AccountModel {
     capabilities?: string[];
     date_since?: DateSelection;
     date_before?: RelativeDate;
-    folder_limit?: number,
     download_folders: string[];
     download_interval_min?: number;
     download_batch_size?: number;
@@ -143,6 +142,7 @@ export interface AccountModel {
     imap_quota_window?: QuotaWindow;
     imap_quota_bytes?: number;
     auto_download_new_mailboxes?: boolean;
+    download_schedule?: string;
 }
 
 export const download_state = async (account_id: number) => {

web/src/features/accounts/components/__tests__/schema.test.ts

@@ -213,37 +213,6 @@ describe('Account Form Schema', () => {
     })
   })
 
-  describe('folder_limit field', () => {
-    it('accepts undefined folder_limit', () => {
-      const result = getAccountSchema(false, t).safeParse(validAccountData)
-      expect(result.success).toBe(true)
-    })
-
-    it('accepts null folder_limit', () => {
-      const result = getAccountSchema(false, t).safeParse({
-        ...validAccountData,
-        folder_limit: null,
-      })
-      expect(result.success).toBe(true)
-    })
-
-    it('rejects folder_limit less than 100', () => {
-      const result = getAccountSchema(false, t).safeParse({
-        ...validAccountData,
-        folder_limit: 50,
-      })
-      expect(result.success).toBe(false)
-    })
-
-    it('accepts folder_limit of exactly 100', () => {
-      const result = getAccountSchema(false, t).safeParse({
-        ...validAccountData,
-        folder_limit: 100,
-      })
-      expect(result.success).toBe(true)
-    })
-  })
-
   describe('account_name and login_name fields', () => {
     it('accepts undefined account_name and login_name', () => {
       const result = getAccountSchema(false, t).safeParse(validAccountData)
@@ -266,6 +235,45 @@ describe('Account Form Schema', () => {
       expect(result.success).toBe(true)
     })
   })
+
+  describe('download_schedule field', () => {
+    it('accepts undefined download_schedule', () => {
+      const result = getAccountSchema(false, t).safeParse(validAccountData)
+      expect(result.success).toBe(true)
+    })
+
+    it('accepts valid 6-field cron expression', () => {
+      const result = getAccountSchema(false, t).safeParse({
+        ...validAccountData,
+        download_schedule: '0 0 0 * * *',
+      })
+      expect(result.success).toBe(true)
+    })
+
+    it('accepts cron with */step syntax', () => {
+      const result = getAccountSchema(false, t).safeParse({
+        ...validAccountData,
+        download_schedule: '0 */30 8-17 * * 1-5',
+      })
+      expect(result.success).toBe(true)
+    })
+
+    it('rejects cron with too few fields', () => {
+      const result = getAccountSchema(false, t).safeParse({
+        ...validAccountData,
+        download_schedule: '0 0 *',
+      })
+      expect(result.success).toBe(false)
+    })
+
+    it('accepts empty string cron (treated as not set)', () => {
+      const result = getAccountSchema(false, t).safeParse({
+        ...validAccountData,
+        download_schedule: '',
+      })
+      expect(result.success).toBe(true)
+    })
+  })
 })
 
 describe('Auth Config Schema (password validation)', () => {

web/src/features/accounts/components/account-detail.tsx

@@ -133,8 +133,8 @@ export function AccountDetailDrawer({ open, onOpenChange, currentRow }: Props) {
                         )}
                       </div>
                       <div className="flex flex-wrap items-center gap-2">
-                        <span className="text-muted-foreground">{t('accounts.folderLimit')}:</span>
-                        <span>{currentRow.folder_limit ? currentRow.folder_limit : t('accounts.notAvailable')}</span>
+                        <span className="text-muted-foreground">{t('accounts.downloadSchedule')}:</span>
+                        <span>{currentRow.download_schedule || t('accounts.notAvailable')}</span>
                       </div>
                     </div>
                   </CardContent>

web/src/features/accounts/components/action-dialog.tsx

@@ -49,7 +49,7 @@ export type Steps = [...Step[]];
 const getSteps = (t: (key: string) => string): Steps => [
   { id: "step-1", name: t('accounts.steps.emailAddress'), fields: ["email", "account_name"] },
   { id: "step-2", name: t('accounts.steps.imap'), fields: ["imap", "use_dangerous", "login_name"] },
-  { id: "step-3", name: t('accounts.steps.syncPreferences'), fields: ["enabled", "date_since", "date_before", "folder_limit", "download_interval_min", "download_batch_size", "auto_download_new_mailboxes"] },
+  { id: "step-3", name: t('accounts.steps.syncPreferences'), fields: ["enabled", "date_since", "date_before", "download_interval_min", "download_batch_size", "auto_download_new_mailboxes", "download_schedule"] },
   { id: "step-4", name: t('accounts.steps.summary'), fields: [] },
 ];
 
@@ -79,10 +79,10 @@ const defaultValues: Account = {
   use_dangerous: false,
   date_since: undefined,
   date_before: undefined,
-  folder_limit: undefined,
   download_interval_min: 60,
   download_batch_size: 30,
   auto_download_new_mailboxes: true,
+  download_schedule: undefined,
 };
 
 const emptyImap: ImapConfig = {
@@ -109,10 +109,10 @@ const mapCurrentRowToFormValues = (currentRow: AccountModel): Account => {
     use_dangerous: currentRow.use_dangerous,
     date_since: currentRow.date_since ?? undefined,
     date_before: currentRow.date_before ?? undefined,
-    folder_limit: currentRow.folder_limit ?? undefined,
     download_interval_min: currentRow.download_interval_min ?? 60,
     download_batch_size: currentRow.download_batch_size ?? 30,
     auto_download_new_mailboxes: currentRow.auto_download_new_mailboxes ?? true,
+    download_schedule: currentRow.download_schedule ?? undefined,
   };
 };
 
@@ -191,18 +191,18 @@ export function AccountActionDialog({ currentRow, open, onOpenChange }: Props) {
         use_dangerous: data.use_dangerous,
         date_since: data.date_since,
         date_before: data.date_before,
-        folder_limit: data.folder_limit,
         download_interval_min: data.download_interval_min,
         download_batch_size: data.download_batch_size,
         auto_download_new_mailboxes: data.auto_download_new_mailboxes,
+        download_schedule: data.download_schedule || null,
       };
       if (isEdit) {
         const isAllMode = !data.date_since && !data.date_before;
-        const clear_folder_limit = !data.folder_limit;
+        const clear_download_schedule = !data.download_schedule && currentRow?.download_schedule;
         updateMutation.mutate({
           ...commonData,
           ...(isAllMode ? { clear_date_range: true } : {}),
-          ...(clear_folder_limit ? { clear_folder_limit: true } : {})
+          ...(clear_download_schedule ? { clear_download_schedule: true } : {})
         });
       } else {
         createMutation.mutate({ ...commonData, account_type: "IMAP" });

web/src/features/accounts/components/columns.tsx

@@ -106,9 +106,12 @@ export function useColumns(): ColumnDef<AccountModel>[] {
         if (account_type === "NoSync") {
           return <LongText className="text-center">n/a</LongText>
         }
+        if (row.original.download_schedule) {
+          return <LongText className="text-center">{row.original.download_schedule}</LongText>
+        }
         return <LongText className="text-center">{row.original.download_interval_min} min</LongText>
       },
-      meta: { className: 'text-center max-w-[120px]' },
+      meta: { className: 'text-center max-w-[160px]' },
       enableHiding: false,
     },
     {

web/src/features/accounts/components/data-table-row-actions.tsx

@@ -98,26 +98,6 @@ export function DataTableRowActions({ row }: DataTableRowActionsProps) {
           </Button>
         </DropdownMenuTrigger>
         <DropdownMenuContent align='end' className='w-[220px]'>
-
-          {showDownload && (
-            <DropdownMenuItem onClick={handleStartDownload}>
-              {t('accounts.startDownload')}
-              <DropdownMenuShortcut>
-                <IconPlayerPlay size={16} />
-              </DropdownMenuShortcut>
-            </DropdownMenuItem>
-          )}
-
-
-          {showDownload && (
-            <DropdownMenuItem onClick={handleCancelDownload}>
-              {t('accounts.cancelDownload')}
-              <DropdownMenuShortcut>
-                <IconPlayerStop size={16} />
-              </DropdownMenuShortcut>
-            </DropdownMenuItem>
-          )}
-          {showDownload && <DropdownMenuSeparator />}
           {hasPermission && <DropdownMenuItem
             onClick={() => {
               setCurrentRow(row.original)
@@ -169,6 +149,27 @@ export function DataTableRowActions({ row }: DataTableRowActionsProps) {
             </DropdownMenuShortcut>
           </DropdownMenuItem>}
           {hasPermission && <DropdownMenuSeparator />}
+
+          {showDownload && (
+            <DropdownMenuItem onClick={handleStartDownload}>
+              {t('accounts.startDownload')}
+              <DropdownMenuShortcut>
+                <IconPlayerPlay size={16} />
+              </DropdownMenuShortcut>
+            </DropdownMenuItem>
+          )}
+
+
+          {showDownload && (
+            <DropdownMenuItem onClick={handleCancelDownload}>
+              {t('accounts.cancelDownload')}
+              <DropdownMenuShortcut>
+                <IconPlayerStop size={16} />
+              </DropdownMenuShortcut>
+            </DropdownMenuItem>
+          )}
+          {showDownload && <DropdownMenuSeparator />}
+
           {hasPermission && <DropdownMenuItem
             onClick={() => {
               setCurrentRow(row.original)

web/src/features/accounts/components/schema.ts

@@ -79,12 +79,6 @@ export const getAccountSchema = (isEdit: boolean, t: (key: string) => string) =>
     use_dangerous: z.boolean(),
     date_since: dateSelectionSchema(t).optional(),
     date_before: relativeDateSchema(t).optional(),
-    folder_limit: z
-      .number({ invalid_type_error: t('validation.folderLimitMustBeNumber') })
-      .int()
-      .min(100, { message: t('validation.folderLimitMustBeAtLeast100') })
-      .nullable()
-      .optional(),
     download_interval_min: z
       .number({
         invalid_type_error: t('validation.incrementalSyncMustBeNumber'),
@@ -107,6 +101,18 @@ export const getAccountSchema = (isEdit: boolean, t: (key: string) => string) =>
         message: t('validation.singleRequestBatchSizeTooLarge'),
       }),
     auto_download_new_mailboxes: z.boolean(),
+    download_schedule: z
+      .string()
+      .optional()
+      .refine(
+        (val) => {
+          if (!val || val.trim() === '') return true;
+          const fields = val.trim().split(/\s+/);
+          if (fields.length < 6) return false;
+          return true;
+        },
+        { message: t('validation.invalidCronExpression') }
+      ),
   })
 
 export type AccountFormValues = z.infer<

web/src/features/accounts/components/step3.tsx

@@ -48,6 +48,72 @@ import i18n from "@/i18n";
 
 
 type SyncMode = 'all' | 'since_fixed' | 'since_relative' | 'before_relative';
+type ScheduleMode = 'interval' | 'cron';
+type CronMode = 'simple' | 'advanced';
+type CronFrequency = 'daily' | 'weekly' | 'monthly';
+
+interface CronSimpleState {
+    frequency: CronFrequency;
+    hour: number;
+    minute: number;
+    dayOfWeek: number;
+    dayOfMonth: number;
+}
+
+const DEFAULT_CRON_SIMPLE: CronSimpleState = {
+    frequency: 'daily',
+    hour: 0,
+    minute: 0,
+    dayOfWeek: 1,
+    dayOfMonth: 1,
+};
+
+function buildCronFromSimple(s: CronSimpleState): string {
+    switch (s.frequency) {
+        case 'daily':
+            return `0 ${s.minute} ${s.hour} * * *`;
+        case 'weekly':
+            return `0 ${s.minute} ${s.hour} * * ${s.dayOfWeek}`;
+        case 'monthly':
+            return `0 ${s.minute} ${s.hour} ${s.dayOfMonth} * *`;
+    }
+}
+
+function tryParseCronToSimple(cron: string): CronSimpleState | null {
+    const fields = cron.trim().split(/\s+/);
+    if (fields.length < 6) return null;
+
+    const sec = fields[0];
+    const min = fields[1];
+    const hour = fields[2];
+    const dom = fields[3];
+    const month = fields[4];
+    const dow = fields[5];
+
+    if (sec !== '0') return null;
+    if (month !== '*') return null;
+
+    const minuteVal = parseInt(min, 10);
+    const hourVal = parseInt(hour, 10);
+    if (isNaN(minuteVal) || isNaN(hourVal)) return null;
+
+    if (dom === '*' && dow === '*') {
+        return { frequency: 'daily', hour: hourVal, minute: minuteVal, dayOfWeek: 1, dayOfMonth: 1 };
+    }
+    if (dom === '*') {
+        const dowVal = parseInt(dow, 10);
+        if (!isNaN(dowVal)) {
+            return { frequency: 'weekly', hour: hourVal, minute: minuteVal, dayOfWeek: dowVal, dayOfMonth: 1 };
+        }
+    }
+    if (dow === '*') {
+        const domVal = parseInt(dom, 10);
+        if (!isNaN(domVal)) {
+            return { frequency: 'monthly', hour: hourVal, minute: minuteVal, dayOfWeek: 1, dayOfMonth: domVal };
+        }
+    }
+    return null;
+}
 
 export default function Step3() {
     const { t } = useTranslation();
@@ -61,6 +127,31 @@ export default function Step3() {
         return 'all';
     });
 
+    const [scheduleMode, setScheduleMode] = useState<ScheduleMode>(() => {
+        if (current.download_schedule) return 'cron';
+        return 'interval';
+    });
+
+    const [cronMode, setCronMode] = useState<CronMode>(() => {
+        if (current.download_schedule && tryParseCronToSimple(current.download_schedule)) {
+            return 'simple';
+        }
+        if (current.download_schedule) return 'advanced';
+        return 'simple';
+    });
+
+    const [cronSimple, setCronSimple] = useState<CronSimpleState>(() => {
+        if (current.download_schedule) {
+            return tryParseCronToSimple(current.download_schedule) ?? DEFAULT_CRON_SIMPLE;
+        }
+        return DEFAULT_CRON_SIMPLE;
+    });
+
+    const updateCronFromSimple = (partial: Partial<CronSimpleState>) => {
+        const next = { ...cronSimple, ...partial };
+        setCronSimple(next);
+        setValue('download_schedule', buildCronFromSimple(next));
+    };
 
     const handleModeChange = (mode: SyncMode) => {
         setSyncMode(mode);
@@ -77,41 +168,231 @@ export default function Step3() {
         }
     };
 
+    const handleScheduleModeChange = (mode: ScheduleMode) => {
+        setScheduleMode(mode);
+        if (mode === 'interval') {
+            setValue("download_schedule", undefined);
+        } else {
+            setValue("download_interval_min", 60);
+            if (cronMode === 'simple') {
+                updateCronFromSimple(cronSimple);
+            }
+        }
+    };
+
     return (
         <div className="space-y-8">
-            <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
-                <FormField
-                    control={control}
-                    name="download_interval_min"
-                    render={({ field }) => (
-                        <FormItem>
-                            <FormLabel>{t('accounts.downloadInterval')}</FormLabel>
-                            <FormControl>
-                                <Input type="number" {...field} onChange={(e) => field.onChange(parseInt(e.target.value, 10))} />
-                            </FormControl>
-                            <FormMessage />
-                            <FormDescription>
-                                {t('accounts.downloadIntervalPlaceholder')}
-                            </FormDescription>
-                        </FormItem>
+            <div className="space-y-4">
+                <FormItem>
+                    <FormLabel className="text-base font-semibold">{t('accounts.scheduleMode')}</FormLabel>
+                    <FormDescription>
+                        {t('accounts.scheduleModeDescription')}
+                    </FormDescription>
+                    <Select value={scheduleMode} onValueChange={(v) => handleScheduleModeChange(v as ScheduleMode)}>
+                        <SelectTrigger className="w-full">
+                            <SelectValue />
+                        </SelectTrigger>
+                        <SelectContent>
+                            <SelectItem value="interval">{t('accounts.scheduleModeInterval')}</SelectItem>
+                            <SelectItem value="cron">{t('accounts.scheduleModeCron')}</SelectItem>
+                        </SelectContent>
+                    </Select>
+                </FormItem>
+                <div className="grid grid-cols-1 md:grid-cols-2 gap-6">
+                    {scheduleMode === 'interval' ? (
+                        <FormField
+                            control={control}
+                            name="download_interval_min"
+                            render={({ field }) => (
+                                <FormItem>
+                                    <FormLabel>{t('accounts.downloadInterval')}</FormLabel>
+                                    <FormControl>
+                                        <Input type="number" {...field} onChange={(e) => field.onChange(parseInt(e.target.value, 10))} />
+                                    </FormControl>
+                                    <FormMessage />
+                                    <FormDescription>
+                                        {t('accounts.downloadIntervalPlaceholder')}
+                                    </FormDescription>
+                                </FormItem>
+                            )}
+                        />
+                    ) : (
+                        <div className="space-y-3">
+                            <div className="flex items-center gap-2">
+                                {/* <FormLabel className="text-sm font-medium">{t('accounts.downloadSchedule')}</FormLabel> */}
+                                <div className="flex items-center rounded-md border text-xs">
+                                    <button
+                                        type="button"
+                                        className={`px-2 py-1 rounded-l-md ${cronMode === 'simple' ? 'bg-primary text-primary-foreground' : 'text-muted-foreground hover:text-foreground'}`}
+                                        onClick={() => setCronMode('simple')}
+                                    >
+                                        {t('accounts.cronSimple')}
+                                    </button>
+                                    <button
+                                        type="button"
+                                        className={`px-2 py-1 rounded-r-md ${cronMode === 'advanced' ? 'bg-primary text-primary-foreground' : 'text-muted-foreground hover:text-foreground'}`}
+                                        onClick={() => setCronMode('advanced')}
+                                    >
+                                        {t('accounts.cronAdvanced')}
+                                    </button>
+                                </div>
+                            </div>
+
+                            {cronMode === 'simple' ? (
+                                <div className="flex flex-wrap items-end gap-3">
+                                    <FormItem className="w-[140px]">
+                                        <FormLabel className="text-xs">{t('accounts.cronFrequency')}</FormLabel>
+                                        <Select
+                                            value={cronSimple.frequency}
+                                            onValueChange={(v) => updateCronFromSimple({ frequency: v as CronFrequency })}
+                                        >
+                                            <SelectTrigger>
+                                                <SelectValue />
+                                            </SelectTrigger>
+                                            <SelectContent>
+                                                <SelectItem value="daily">{t('accounts.cronDaily')}</SelectItem>
+                                                <SelectItem value="weekly">{t('accounts.cronWeekly')}</SelectItem>
+                                                <SelectItem value="monthly">{t('accounts.cronMonthly')}</SelectItem>
+                                            </SelectContent>
+                                        </Select>
+                                    </FormItem>
+
+                                    <FormItem className="w-[80px]">
+                                        <FormLabel className="text-xs">{t('accounts.cronHour')}</FormLabel>
+                                        <Select
+                                            value={String(cronSimple.hour)}
+                                            onValueChange={(v) => updateCronFromSimple({ hour: parseInt(v, 10) })}
+                                        >
+                                            <SelectTrigger>
+                                                <SelectValue />
+                                            </SelectTrigger>
+                                            <SelectContent>
+                                                {Array.from({ length: 24 }, (_, i) => (
+                                                    <SelectItem key={i} value={String(i)}>
+                                                        {String(i).padStart(2, '0')}
+                                                    </SelectItem>
+                                                ))}
+                                            </SelectContent>
+                                        </Select>
+                                    </FormItem>
+
+                                    <span className="text-muted-foreground pb-2">:</span>
+
+                                    <FormItem className="w-[80px]">
+                                        <FormLabel className="text-xs">{t('accounts.cronMinute')}</FormLabel>
+                                        <Select
+                                            value={String(cronSimple.minute)}
+                                            onValueChange={(v) => updateCronFromSimple({ minute: parseInt(v, 10) })}
+                                        >
+                                            <SelectTrigger>
+                                                <SelectValue />
+                                            </SelectTrigger>
+                                            <SelectContent>
+                                                {[0, 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55].map((m) => (
+                                                    <SelectItem key={m} value={String(m)}>
+                                                        {String(m).padStart(2, '0')}
+                                                    </SelectItem>
+                                                ))}
+                                            </SelectContent>
+                                        </Select>
+                                    </FormItem>
+
+                                    {cronSimple.frequency === 'weekly' && (
+                                        <FormItem className="w-[140px]">
+                                            <FormLabel className="text-xs">{t('accounts.cronDayOfWeek')}</FormLabel>
+                                            <Select
+                                                value={String(cronSimple.dayOfWeek)}
+                                                onValueChange={(v) => updateCronFromSimple({ dayOfWeek: parseInt(v, 10) })}
+                                            >
+                                                <SelectTrigger>
+                                                    <SelectValue />
+                                                </SelectTrigger>
+                                                <SelectContent>
+                                                    <SelectItem value="1">{t('accounts.cronMonday')}</SelectItem>
+                                                    <SelectItem value="2">{t('accounts.cronTuesday')}</SelectItem>
+                                                    <SelectItem value="3">{t('accounts.cronWednesday')}</SelectItem>
+                                                    <SelectItem value="4">{t('accounts.cronThursday')}</SelectItem>
+                                                    <SelectItem value="5">{t('accounts.cronFriday')}</SelectItem>
+                                                    <SelectItem value="6">{t('accounts.cronSaturday')}</SelectItem>
+                                                    <SelectItem value="0">{t('accounts.cronSunday')}</SelectItem>
+                                                </SelectContent>
+                                            </Select>
+                                        </FormItem>
+                                    )}
+
+                                    {cronSimple.frequency === 'monthly' && (
+                                        <FormItem className="w-[90px]">
+                                            <FormLabel className="text-xs">{t('accounts.cronDayOfMonth')}</FormLabel>
+                                            <Select
+                                                value={String(cronSimple.dayOfMonth)}
+                                                onValueChange={(v) => updateCronFromSimple({ dayOfMonth: parseInt(v, 10) })}
+                                            >
+                                                <SelectTrigger>
+                                                    <SelectValue />
+                                                </SelectTrigger>
+                                                <SelectContent className="max-h-[200px]">
+                                                    {Array.from({ length: 28 }, (_, i) => i + 1).map((d) => (
+                                                        <SelectItem key={d} value={String(d)}>
+                                                            {d}
+                                                        </SelectItem>
+                                                    ))}
+                                                </SelectContent>
+                                            </Select>
+                                        </FormItem>
+                                    )}
+
+                                    <div className="text-xs text-muted-foreground pb-2 font-mono">
+                                        = {buildCronFromSimple(cronSimple)}
+                                    </div>
+                                </div>
+                            ) : (
+                                <FormField
+                                    control={control}
+                                    name="download_schedule"
+                                    render={({ field }) => (
+                                        <FormItem>
+                                            <FormControl>
+                                                <Input
+                                                    {...field}
+                                                    value={field.value ?? ''}
+                                                    placeholder={t('accounts.downloadSchedulePlaceholder')}
+                                                />
+                                            </FormControl>
+                                            <FormDescription>
+                                                {t('accounts.downloadScheduleDescription')}
+                                            </FormDescription>
+                                            <FormMessage />
+                                        </FormItem>
+                                    )}
+                                />
+                            )}
+
+                            {cronMode === 'simple' && (
+                                <FormDescription>{t('accounts.downloadScheduleDescription')}</FormDescription>
+                            )}
+
+                            <div className="text-xs text-muted-foreground mt-1 flex items-center gap-1">
+                                <span>{t('accounts.cronTimezoneNote')}</span>
+                            </div>
+                        </div>
                     )}
-                />
-                <FormField
-                    control={control}
-                    name="download_batch_size"
-                    render={({ field }) => (
-                        <FormItem>
-                            <FormLabel>{t('accounts.downloadBatchSize')}</FormLabel>
-                            <FormControl>
-                                <Input type="number" {...field} onChange={(e) => field.onChange(parseInt(e.target.value, 10))} />
-                            </FormControl>
-                            <FormMessage />
-                            <FormDescription>
-                                {t('accounts.downloadBatchSizeDescription')}
-                            </FormDescription>
-                        </FormItem>
-                    )}
-                />
+                    <FormField
+                        control={control}
+                        name="download_batch_size"
+                        render={({ field }) => (
+                            <FormItem>
+                                <FormLabel>{t('accounts.downloadBatchSize')}</FormLabel>
+                                <FormControl>
+                                    <Input type="number" {...field} onChange={(e) => field.onChange(parseInt(e.target.value, 10))} />
+                                </FormControl>
+                                <FormMessage />
+                                <FormDescription>
+                                    {t('accounts.downloadBatchSizeDescription')}
+                                </FormDescription>
+                            </FormItem>
+                        )}
+                    />
+                </div>
             </div>
 
             <FormField
@@ -249,29 +530,6 @@ export default function Step3() {
             />
 
             <hr className="my-4" />
-
-            <FormField
-                control={control}
-                name="folder_limit"
-                render={({ field }) => (
-                    <FormItem>
-                        <FormLabel>{t('accounts.folderLimit')}</FormLabel>
-                        <FormDescription>{t('accounts.folderLimitDescription')}</FormDescription>
-                        <FormControl>
-                            <Input
-                                type="number"
-                                placeholder={t('accounts.folderLimitPlaceholder')}
-                                value={field.value ?? ''}
-                                onChange={(e) => {
-                                    const value = e.target.value;
-                                    field.onChange(value === '' ? null : Number(value));
-                                }}
-                            />
-                        </FormControl>
-                        <FormMessage />
-                    </FormItem>
-                )}
-            />
         </div>
     );
 }

web/src/features/accounts/components/step4.tsx

@@ -50,7 +50,7 @@ export default function Step4() {
 
     return (
         <div className="rounded-xl">
-            <Accordion type="multiple" defaultValue={['email', 'account_name', 'login_name', 'imap', 'date_since', 'folder_limit', 'sync_interval', 'sync_scope', 'sync_batch_size']}>
+            <Accordion type="multiple" defaultValue={['email', 'account_name', 'login_name', 'imap', 'date_since', 'sync_interval', 'sync_scope', 'sync_batch_size', 'download_schedule']}>
                 <AccordionItem key="email" value="email">
                     <AccordionTrigger className="font-medium capitalize text-gray-600">{t('accounts.email')}:</AccordionTrigger>
                     <AccordionContent>{summaryData.email}</AccordionContent>
@@ -154,11 +154,6 @@ export default function Step4() {
                 </AccordionItem>
 
 
-                <AccordionItem key="folder_limit" value="folder_limit">
-                    <AccordionTrigger className="font-medium capitalize text-gray-600">{t('accounts.folderLimit')}:</AccordionTrigger>
-                    <AccordionContent>{summaryData.folder_limit ?? t('accounts.notAvailable')}</AccordionContent>
-                </AccordionItem>
-
                 <AccordionItem key="sync_interval" value="sync_interval">
                     <AccordionTrigger className="font-medium capitalize text-gray-600">{t('accounts.downloadInterval')}:</AccordionTrigger>
                     <AccordionContent>{summaryData.download_interval_min} {t('accounts.minutes')}</AccordionContent>
@@ -169,6 +164,11 @@ export default function Step4() {
                     <AccordionContent>{summaryData.download_batch_size}</AccordionContent>
                 </AccordionItem>
 
+                <AccordionItem key="download_schedule" value="download_schedule">
+                    <AccordionTrigger className="font-medium capitalize text-gray-600">{t('accounts.downloadSchedule')}:</AccordionTrigger>
+                    <AccordionContent>{summaryData.download_schedule || t('accounts.notAvailable')}</AccordionContent>
+                </AccordionItem>
+
                 <AccordionItem key="auto_download_new_mailboxes" value="auto_download_new_mailboxes">
                     <AccordionTrigger className="font-medium capitalize text-gray-600">{t('accounts.autoDownloadNewMailboxes')}:</AccordionTrigger>
                     <AccordionContent>{summaryData.auto_download_new_mailboxes ? t('common.yes') : t('common.no')}</AccordionContent>

web/src/locales/ar.json

@@ -115,6 +115,24 @@
     "continue": "متابعة",
     "createdAt": "تاريخ الإنشاء",
     "creationFailed": "فشل الإنشاء، يرجى المحاولة مرة أخرى لاحقًا",
+    "cronAdvanced": "تعبير متقدم",
+    "cronDaily": "يومياً",
+    "cronDayOfMonth": "اليوم من الأسبوع",
+    "cronDayOfWeek": "اليوم من الأسبوع",
+    "cronFrequency": "التكرار",
+    "cronFriday": "الجمعة",
+    "cronHour": "الساعة",
+    "cronMinute": "الدقيقة",
+    "cronMonday": "الإثنين",
+    "cronMonthly": "شهرياً",
+    "cronSaturday": "السبت",
+    "cronSimple": "تعبير بسيط",
+    "cronSunday": "الأحد",
+    "cronThursday": "الخميس",
+    "cronTimezoneNote": "جميع الأوقات بالتوقيت المحلي للخادم.",
+    "cronTuesday": "الثلاثاء",
+    "cronWednesday": "الأربعاء",
+    "cronWeekly": "أسبوعياً",
     "dateSelection": "تحديد التاريخ",
     "dateSince": "التاريخ منذ",
     "days": "أيام",
@@ -133,6 +151,9 @@
     "downloadFailed": "فشل بدء مهمة التنزيل",
     "downloadInterval": "دورة التنزيل (بالدقائق)",
     "downloadIntervalPlaceholder": "أدخل الدقائق",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "كرون من 6 حقول (ثانية-دقائق-ساعات-يوم-شهر-أسبوع) بتوقيت الخادم. يتجاوز الفاصل الزمني.",
+    "downloadSchedulePlaceholder": "مثال: 0 0 * * *",
     "downloadScope": "استراتيجية التنزيل",
     "downloadScopeDescription": "اختر رسائل البريد الإلكتروني التي يجب فهرستها وتنزيلها.",
     "downloadStarted": "بدأت مهمة التنزيل",
@@ -156,9 +177,6 @@
     "everyMinutes": "كل {{minutes}} دقيقة",
     "field": "الحقل",
     "fixed": "ثابت",
-    "folderLimit": "حد المجلد",
-    "folderLimitDescription": "حدد عدد رسائل البريد الإلكتروني للمزامنة لكل مجلد (الحد الأدنى 100). اتركه فارغًا بلا حدود.",
-    "folderLimitPlaceholder": "مثال: 1000",
     "folderSync": {
       "autoSelectDescendants": "تحديد العناصر الفرعية تلقائيًا",
       "autoSelectParents": "تحديد العناصر الأصلية تلقائيًا",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "حفظ التغييرات",
+    "scheduleMode": "جدولة التنزيل",
+    "scheduleModeCron": "تعبير Cron",
+    "scheduleModeDescription": "تعيين التنزيل بفواصل زمنية ثابتة أو عبر Cron.",
+    "scheduleModeInterval": "فواصل زمنية ثابتة",
     "selectAccountType": "اختر نوع الحساب",
     "selectAtLeastOneFolder": "يرجى تحديد مجلد واحد على الأقل",
     "selectAuthMethod": "اختر طريقة مصادقة",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "البريد الإلكتروني مطلوب",
-    "folderLimitMustBeAtLeast100": "يجب أن يكون حد المجلد 100 على الأقل",
-    "folderLimitMustBeNumber": "يجب أن يكون حد المجلد رقمًا",
     "imapHostCannotBeEmpty": "لا يمكن أن يكون مُضيف IMAP فارغًا",
     "imapHostRequired": "مُضيف IMAP مطلوب",
     "imapPortMustBeLessThan65536": "يجب أن يكون منفذ IMAP أقل من 65536",
     "imapPortMustBePositive": "يجب أن يكون منفذ IMAP عددًا صحيحًا موجبًا",
     "incrementalSyncMustBeAtLeast10": "يجب أن يكون فاصل المزامنة التزايدية 10 دقائق على الأقل",
     "incrementalSyncMustBeNumber": "يجب أن يكون فاصل المزامنة التزايدية رقمًا",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "عنوان بريد إلكتروني غير صالح",
     "invalidUrl": "عنوان URL غير صالح",
     "passwordMinLength": "يجب أن تتكون كلمة المرور من {{min}} أحرف على الأقل",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "يجب أن يكون حجم الدُفعة على الأكثر 200",
     "singleRequestBatchSizeTooSmall": "يجب أن يكون حجم الدُفعة على الأقل 10"
   }
-}
+}

web/src/locales/da.json

@@ -115,6 +115,24 @@
     "continue": "Fortsæt",
     "createdAt": "Oprettet",
     "creationFailed": "Oprettelse mislykkedes, prøv venligst igen senere",
+    "cronAdvanced": "Avanceret udtryk",
+    "cronDaily": "Dagligt",
+    "cronDayOfMonth": "Ugedag",
+    "cronDayOfWeek": "Ugedag",
+    "cronFrequency": "Frekvens",
+    "cronFriday": "Fredag",
+    "cronHour": "Time",
+    "cronMinute": "Minut",
+    "cronMonday": "Mandag",
+    "cronMonthly": "Månedligt",
+    "cronSaturday": "Lørdag",
+    "cronSimple": "Simpelt udtryk",
+    "cronSunday": "Søndag",
+    "cronThursday": "Torsdag",
+    "cronTimezoneNote": "Alle tider er serverens lokale tid.",
+    "cronTuesday": "Tirsdag",
+    "cronWednesday": "Onsdag",
+    "cronWeekly": "Ugentligt",
     "dateSelection": "Datovalg",
     "dateSince": "Dato fra",
     "days": "Dage",
@@ -133,6 +151,9 @@
     "downloadFailed": "Kunne ikke starte download-opgave",
     "downloadInterval": "Downloadinterval (minutter)",
     "downloadIntervalPlaceholder": "Indtast minutter",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-felters Cron (sek min time dag mdr ugedag) i servertid. Tilsidesætter interval.",
+    "downloadSchedulePlaceholder": "F.eks.: 0 0 * * *",
     "downloadScope": "Downloadstrategi",
     "downloadScopeDescription": "Vælg hvilke e-mails der skal indekseres og downloades.",
     "downloadStarted": "Download-opgave startet",
@@ -156,9 +177,6 @@
     "everyMinutes": "hvert {{minutes}} minut",
     "field": "Felt",
     "fixed": "Fast",
-    "folderLimit": "Mappegrænse",
-    "folderLimitDescription": "Begræns antallet af e-mails, der skal synkroniseres pr. mappe (minimum 100). Lad stå tomt for ingen grænse.",
-    "folderLimitPlaceholder": "f.eks. 1000",
     "folderSync": {
       "autoSelectDescendants": "Vælg efterkommere automatisk",
       "autoSelectParents": "Vælg forældre automatisk",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Gem ændringer",
+    "scheduleMode": "Planlægning af download",
+    "scheduleModeCron": "Cron-udtryk",
+    "scheduleModeDescription": "Download via faste intervaller eller Cron.",
+    "scheduleModeInterval": "Fast interval",
     "selectAccountType": "Vælg kontotype",
     "selectAtLeastOneFolder": "Vælg venligst mindst én mappe",
     "selectAuthMethod": "Vælg en godkendelsesmetode",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "E-mail er påkrævet",
-    "folderLimitMustBeAtLeast100": "Mappegrænse skal være mindst 100",
-    "folderLimitMustBeNumber": "Mappegrænse skal være et tal",
     "imapHostCannotBeEmpty": "IMAP-vært kan ikke være tom",
     "imapHostRequired": "IMAP-vært er påkrævet",
     "imapPortMustBeLessThan65536": "IMAP-port skal være mindre end 65536",
     "imapPortMustBePositive": "IMAP-port skal være et positivt heltal",
     "incrementalSyncMustBeAtLeast10": "Inkrementelt synkroniseringsinterval skal være mindst 10 minutter",
     "incrementalSyncMustBeNumber": "Inkrementelt synkroniseringsinterval skal være et tal",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Ugyldig e-mailadresse",
     "invalidUrl": "Ugyldig URL",
     "passwordMinLength": "Adgangskoden skal være mindst {{min}} tegn lang",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Batch‑størrelse skal være højst 200",
     "singleRequestBatchSizeTooSmall": "Batch‑størrelse skal være mindst 10"
   }
-}
+}

web/src/locales/de.json

@@ -115,6 +115,24 @@
     "continue": "Weiter",
     "createdAt": "Erstellt am",
     "creationFailed": "Erstellung fehlgeschlagen, bitte versuchen Sie es später erneut",
+    "cronAdvanced": "Erweiterter Ausdruck",
+    "cronDaily": "Täglich",
+    "cronDayOfMonth": "Wochentag",
+    "cronDayOfWeek": "Wochentag",
+    "cronFrequency": "Häufigkeit",
+    "cronFriday": "Freitag",
+    "cronHour": "Stunde",
+    "cronMinute": "Minute",
+    "cronMonday": "Montag",
+    "cronMonthly": "Monatlich",
+    "cronSaturday": "Samstag",
+    "cronSimple": "Einfacher Ausdruck",
+    "cronSunday": "Sonntag",
+    "cronThursday": "Donnerstag",
+    "cronTimezoneNote": "Alle Zeiten nutzen Server-Ortszeit.",
+    "cronTuesday": "Dienstag",
+    "cronWednesday": "Mittwoch",
+    "cronWeekly": "Wöchentlich",
     "dateSelection": "Datumsauswahl",
     "dateSince": "Datum seit",
     "days": "Tage",
@@ -133,6 +151,9 @@
     "downloadFailed": "Download-Aufgabe konnte nicht gestartet werden",
     "downloadInterval": "Download-Intervall (Minuten)",
     "downloadIntervalPlaceholder": "Minuten eingeben",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-Felder-Cron (Sek Min Std Tag Mon Wochentag) in Serverzeit. Ersetzt Intervall.",
+    "downloadSchedulePlaceholder": "Z. B.: 0 0 * * *",
     "downloadScope": "Download-Strategie",
     "downloadScopeDescription": "Wählen Sie aus, welche E-Mails indiziert und heruntergeladen werden sollen.",
     "downloadStarted": "Download-Aufgabe gestartet",
@@ -156,9 +177,6 @@
     "everyMinutes": "alle {{minutes}} Minuten",
     "field": "Feld",
     "fixed": "Fest",
-    "folderLimit": "Ordnerlimit",
-    "folderLimitDescription": "Begrenzen Sie die Anzahl der pro Ordner zu synchronisierenden E-Mails (mindestens 100). Lassen Sie das Feld leer für keine Begrenzung.",
-    "folderLimitPlaceholder": "z.B. 1000",
     "folderSync": {
       "autoSelectDescendants": "Unterelemente automatisch auswählen",
       "autoSelectParents": "Elternelemente automatisch auswählen",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Änderungen speichern",
+    "scheduleMode": "Download-Zeitplan",
+    "scheduleModeCron": "Cron-Ausdruck",
+    "scheduleModeDescription": "Download nach festem Intervall oder Cron-Ausdruck.",
+    "scheduleModeInterval": "Festes Intervall",
     "selectAccountType": "Kontotyp auswählen",
     "selectAtLeastOneFolder": "Wählen Sie mindestens einen Ordner aus",
     "selectAuthMethod": "Authentifizierungsmethode auswählen",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "E-Mail ist erforderlich",
-    "folderLimitMustBeAtLeast100": "Das Ordnerlimit muss mindestens 100 betragen",
-    "folderLimitMustBeNumber": "Das Ordnerlimit muss eine Zahl sein",
     "imapHostCannotBeEmpty": "IMAP-Host darf nicht leer sein",
     "imapHostRequired": "IMAP-Host ist erforderlich",
     "imapPortMustBeLessThan65536": "Der IMAP-Port muss kleiner als 65536 sein",
     "imapPortMustBePositive": "Der IMAP-Port muss eine positive ganze Zahl sein",
     "incrementalSyncMustBeAtLeast10": "Das inkrementelle Synchronisierungsintervall muss mindestens 10 Minuten betragen",
     "incrementalSyncMustBeNumber": "Das inkrementelle Synchronisierungsintervall muss eine Zahl sein",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Ungültige E-Mail-Adresse",
     "invalidUrl": "Ungültige URL",
     "passwordMinLength": "Das Passwort muss mindestens {{min}} Zeichen lang sein",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Die Stapelgröße darf höchstens 200 sein",
     "singleRequestBatchSizeTooSmall": "Die Stapelgröße muss mindestens 10 sein"
   }
-}
+}

web/src/locales/en.json

@@ -115,6 +115,24 @@
     "continue": "Continue",
     "createdAt": "Created At",
     "creationFailed": "Creation failed, please try again later",
+    "cronAdvanced": "Advanced Expression",
+    "cronDaily": "Daily",
+    "cronDayOfMonth": "Day of Week",
+    "cronDayOfWeek": "Day of Week",
+    "cronFrequency": "Frequency",
+    "cronFriday": "Friday",
+    "cronHour": "Hour",
+    "cronMinute": "Minute",
+    "cronMonday": "Monday",
+    "cronMonthly": "Monthly",
+    "cronSaturday": "Saturday",
+    "cronSimple": "Simple Expression",
+    "cronSunday": "Sunday",
+    "cronThursday": "Thursday",
+    "cronTimezoneNote": "All times use server local timezone.",
+    "cronTuesday": "Tuesday",
+    "cronWednesday": "Wednesday",
+    "cronWeekly": "Weekly",
     "dateSelection": "Date Selection",
     "dateSince": "Date Since",
     "days": "Days",
@@ -133,6 +151,9 @@
     "downloadFailed": "Failed to start download task",
     "downloadInterval": "Download Interval (minutes)",
     "downloadIntervalPlaceholder": "Enter minutes",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-field Cron (sec min hour day month dow) in server time. Overrides interval.",
+    "downloadSchedulePlaceholder": "e.g., 0 0 * * *",
     "downloadScope": "Download Strategy",
     "downloadScopeDescription": "Choose which emails should be indexed and downloaded.",
     "downloadStarted": "Download task started",
@@ -156,9 +177,6 @@
     "everyMinutes": "every {{minutes}} minutes",
     "field": "Field",
     "fixed": "Fixed",
-    "folderLimit": "Folder Limit",
-    "folderLimitDescription": "Limit the number of emails to sync per folder (minimum 100). Leave empty for no limit.",
-    "folderLimitPlaceholder": "e.g. 1000",
     "folderSync": {
       "autoSelectDescendants": "Auto select descendants",
       "autoSelectParents": "Auto select parents",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Save changes",
+    "scheduleMode": "Download Schedule",
+    "scheduleModeCron": "Cron Expression",
+    "scheduleModeDescription": "Download via fixed intervals or Cron expressions.",
+    "scheduleModeInterval": "Fixed Interval",
     "selectAccountType": "Select account type",
     "selectAtLeastOneFolder": "Please select at least one folder",
     "selectAuthMethod": "Select an authentication method",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "Email is required",
-    "folderLimitMustBeAtLeast100": "Folder limit must be at least 100",
-    "folderLimitMustBeNumber": "Folder limit must be a number",
     "imapHostCannotBeEmpty": "IMAP host cannot be empty",
     "imapHostRequired": "IMAP host is required",
     "imapPortMustBeLessThan65536": "IMAP port must be less than 65536",
     "imapPortMustBePositive": "IMAP port must be a positive integer",
     "incrementalSyncMustBeAtLeast10": "Incremental sync interval must be at least 10 minutes",
     "incrementalSyncMustBeNumber": "Incremental sync interval must be a number",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Invalid email address",
     "invalidUrl": "Invalid URL",
     "passwordMinLength": "Password must be at least {{min}} characters long",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Batch size must be at most 200",
     "singleRequestBatchSizeTooSmall": "Batch size must be at least 10"
   }
-}
+}

web/src/locales/es.json

@@ -115,6 +115,24 @@
     "continue": "Continuar",
     "createdAt": "Creado el",
     "creationFailed": "Error al crear, por favor, inténtalo de nuevo más tarde",
+    "cronAdvanced": "Expresión avanzada",
+    "cronDaily": "Diario",
+    "cronDayOfMonth": "Día de la semana",
+    "cronDayOfWeek": "Día de la semana",
+    "cronFrequency": "Frecuencia",
+    "cronFriday": "Viernes",
+    "cronHour": "Hora",
+    "cronMinute": "Minuto",
+    "cronMonday": "Lunes",
+    "cronMonthly": "Mensual",
+    "cronSaturday": "Sábado",
+    "cronSimple": "Expresión simple",
+    "cronSunday": "Domingo",
+    "cronThursday": "Jueves",
+    "cronTimezoneNote": "Horas en zona horaria del servidor.",
+    "cronTuesday": "Martes",
+    "cronWednesday": "Miércoles",
+    "cronWeekly": "Semanal",
     "dateSelection": "Selección de fecha",
     "dateSince": "Fecha desde",
     "days": "Días",
@@ -133,6 +151,9 @@
     "downloadFailed": "Error al iniciar la tarea de descarga",
     "downloadInterval": "Intervalo de descarga (minutos)",
     "downloadIntervalPlaceholder": "Ingresa los minutos",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "Cron de 6 campos (seg min hora día mes día-sem) en hora del servidor. Anula intervalo.",
+    "downloadSchedulePlaceholder": "ej., 0 0 * * *",
     "downloadScope": "Estrategia de descarga",
     "downloadScopeDescription": "Elija qué correos electrónicos deben indexarse y descargarse.",
     "downloadStarted": "Tarea de descarga iniciada",
@@ -156,9 +177,6 @@
     "everyMinutes": "cada {{minutes}} minutos",
     "field": "Campo",
     "fixed": "Fija",
-    "folderLimit": "Límite de carpetas",
-    "folderLimitDescription": "Limita el número de correos a sincronizar por carpeta (mínimo 100). Deja vacío para no tener límite.",
-    "folderLimitPlaceholder": "ej. 1000",
     "folderSync": {
       "autoSelectDescendants": "Seleccionar automáticamente los descendientes",
       "autoSelectParents": "Seleccionar automáticamente los padres",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Guardar cambios",
+    "scheduleMode": "Programación de descarga",
+    "scheduleModeCron": "Expresión Cron",
+    "scheduleModeDescription": "Descarga por intervalos fijos o expresiones Cron.",
+    "scheduleModeInterval": "Intervalo fijo",
     "selectAccountType": "Seleccionar tipo de cuenta",
     "selectAtLeastOneFolder": "Selecciona al menos una carpeta",
     "selectAuthMethod": "Selecciona el método de autenticación",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "El correo electrónico es obligatorio",
-    "folderLimitMustBeAtLeast100": "El límite de carpetas debe ser de al menos 100",
-    "folderLimitMustBeNumber": "El límite de carpetas debe ser un número",
     "imapHostCannotBeEmpty": "El host IMAP no puede estar vacío",
     "imapHostRequired": "El host IMAP es obligatorio",
     "imapPortMustBeLessThan65536": "El puerto IMAP debe ser menor que 65536",
     "imapPortMustBePositive": "El puerto IMAP debe ser un número entero positivo",
     "incrementalSyncMustBeAtLeast10": "El intervalo de sincronización incremental debe ser de al menos 10 minutos",
     "incrementalSyncMustBeNumber": "El intervalo de sincronización incremental debe ser un número",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Dirección de correo electrónico inválida",
     "invalidUrl": "URL inválida",
     "passwordMinLength": "La contraseña debe tener al menos {{min}} caracteres",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "El tamaño del lote debe ser como máximo 200",
     "singleRequestBatchSizeTooSmall": "El tamaño del lote debe ser al menos 10"
   }
-}
+}

web/src/locales/fi.json

@@ -115,6 +115,24 @@
     "continue": "Jatka",
     "createdAt": "Luotu",
     "creationFailed": "Luominen epäonnistui, yritä myöhemmin uudelleen",
+    "cronAdvanced": "Edistynyt lauseke",
+    "cronDaily": "Päivittäin",
+    "cronDayOfMonth": "Viikonpäivä",
+    "cronDayOfWeek": "Viikonpäivä",
+    "cronFrequency": "Tiheys",
+    "cronFriday": "Perjantai",
+    "cronHour": "Tunti",
+    "cronMinute": "Minuutti",
+    "cronMonday": "Maanantai",
+    "cronMonthly": "Kuukausittain",
+    "cronSaturday": "Lauantai",
+    "cronSimple": "Yksinkertainen lauseke",
+    "cronSunday": "Sunnuntai",
+    "cronThursday": "Torstai",
+    "cronTimezoneNote": "Kaikki ajat palvelimen paikallista aikaa.",
+    "cronTuesday": "Tiistai",
+    "cronWednesday": "Keskiviikko",
+    "cronWeekly": "Viikoittain",
     "dateSelection": "Päivämäärän valinta",
     "dateSince": "Päivämäärä alkaen",
     "days": "Päivää",
@@ -133,6 +151,9 @@
     "downloadFailed": "Lataustehtävän aloittaminen epäonnistui",
     "downloadInterval": "Latausväli (minuuttia)",
     "downloadIntervalPlaceholder": "Syötä minuutit",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-kenttäinen Cron (sek min tun pv kk vkpv) palvelimen ajassa. Korvaa aikavälin.",
+    "downloadSchedulePlaceholder": "esim. 0 0 * * *",
     "downloadScope": "Latausstrategia",
     "downloadScopeDescription": "Valitse, mitkä sähköpostit indeksoidaan ja ladataan.",
     "downloadStarted": "Lataustehtävä aloitettu",
@@ -156,9 +177,6 @@
     "everyMinutes": "joka {{minutes}} minuutti",
     "field": "Kenttä",
     "fixed": "Kiinteä",
-    "folderLimit": "Kansioraja",
-    "folderLimitDescription": "Rajoittaa synkronoitavien sähköpostien määrän kansiota kohden (vähintään 100). Jätä tyhjäksi ilman rajoitusta.",
-    "folderLimitPlaceholder": "esim. 1000",
     "folderSync": {
       "autoSelectDescendants": "Valitse alisolmut automaattisesti",
       "autoSelectParents": "Valitse yläsolmut automaattisesti",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Tallenna muutokset",
+    "scheduleMode": "Latauksen ajoitus",
+    "scheduleModeCron": "Cron-lauseke",
+    "scheduleModeDescription": "Lataa säännöllisin väliajoin tai Cron-lausekkeella.",
+    "scheduleModeInterval": "Säännöllinen väliaika",
     "selectAccountType": "Valitse tilityyppi",
     "selectAtLeastOneFolder": "Valitse vähintään yksi kansio",
     "selectAuthMethod": "Valitse todennusmenetelmä",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "Sähköposti on pakollinen",
-    "folderLimitMustBeAtLeast100": "Kansiorajan on oltava vähintään 100",
-    "folderLimitMustBeNumber": "Kansiorajan on oltava numero",
     "imapHostCannotBeEmpty": "IMAP-isäntä ei voi olla tyhjä",
     "imapHostRequired": "IMAP-isäntä on pakollinen",
     "imapPortMustBeLessThan65536": "IMAP-portin on oltava pienempi kuin 65536",
     "imapPortMustBePositive": "IMAP-portin on oltava positiivinen kokonaisluku",
     "incrementalSyncMustBeAtLeast10": "Lisäävän synkronoinnin välin on oltava vähintään 10 minuuttia",
     "incrementalSyncMustBeNumber": "Lisäävän synkronoinnin välin on oltava numero",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Virheellinen sähköpostiosoite",
     "invalidUrl": "Virheellinen URL-osoite",
     "passwordMinLength": "Salasanan on oltava vähintään {{min}} merkkiä pitkä",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Eräkoko tulee olla enintään 200",
     "singleRequestBatchSizeTooSmall": "Eräkoko tulee olla vähintään 10"
   }
-}
+}

web/src/locales/fr.json

@@ -115,6 +115,24 @@
     "continue": "Continuer",
     "createdAt": "Créé le",
     "creationFailed": "La création a échoué, veuillez réessayer plus tard",
+    "cronAdvanced": "Expression avancée",
+    "cronDaily": "Chaque jour",
+    "cronDayOfMonth": "Jour de la semaine",
+    "cronDayOfWeek": "Jour de la semaine",
+    "cronFrequency": "Fréquence",
+    "cronFriday": "Vendredi",
+    "cronHour": "Heure",
+    "cronMinute": "Minute",
+    "cronMonday": "Lundi",
+    "cronMonthly": "Chaque mois",
+    "cronSaturday": "Samedi",
+    "cronSimple": "Expression simple",
+    "cronSunday": "Dimanche",
+    "cronThursday": "Jeudi",
+    "cronTimezoneNote": "Heures au fuseau horaire du serveur.",
+    "cronTuesday": "Mardi",
+    "cronWednesday": "Mercredi",
+    "cronWeekly": "Chaque semaine",
     "dateSelection": "Sélection de Date",
     "dateSince": "Date Depuis",
     "days": "Jours",
@@ -133,6 +151,9 @@
     "downloadFailed": "Échec du lancement de la tâche de téléchargement",
     "downloadInterval": "Intervalle de téléchargement (minutes)",
     "downloadIntervalPlaceholder": "Entrer les minutes",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "Cron à 6 champs (sec min heure jour mois jour-sem) à l'heure du serveur. Remplace l'intervalle.",
+    "downloadSchedulePlaceholder": "ex. 0 0 * * *",
     "downloadScope": "Stratégie de téléchargement",
     "downloadScopeDescription": "Choisissez les e-mails à indexer et à télécharger.",
     "downloadStarted": "Tâche de téléchargement lancée",
@@ -156,9 +177,6 @@
     "everyMinutes": "toutes les {{minutes}} minutes",
     "field": "Champ",
     "fixed": "Fixe",
-    "folderLimit": "Limite de Dossiers",
-    "folderLimitDescription": "Limite le nombre d'e-mails à synchroniser par dossier (minimum 100). Laissez vide pour aucune limite.",
-    "folderLimitPlaceholder": "ex. 1000",
     "folderSync": {
       "autoSelectDescendants": "Sélectionner automatiquement les descendants",
       "autoSelectParents": "Sélectionner automatiquement les parents",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Enregistrer les Modifications",
+    "scheduleMode": "Planification de téléchargement",
+    "scheduleModeCron": "Expression Cron",
+    "scheduleModeDescription": "Téléchargement par intervalle fixe ou expression Cron.",
+    "scheduleModeInterval": "Intervalle fixe",
     "selectAccountType": "Sélectionner le type de compte",
     "selectAtLeastOneFolder": "Veuillez sélectionner au moins un dossier",
     "selectAuthMethod": "Sélectionner une méthode d'authentification",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "L'adresse e-mail est obligatoire",
-    "folderLimitMustBeAtLeast100": "La limite de dossiers doit être d'au moins 100",
-    "folderLimitMustBeNumber": "La limite de dossiers doit être un nombre",
     "imapHostCannotBeEmpty": "L'hôte IMAP ne peut pas être vide",
     "imapHostRequired": "L'hôte IMAP est obligatoire",
     "imapPortMustBeLessThan65536": "Le port IMAP doit être inférieur à 65536",
     "imapPortMustBePositive": "Le port IMAP doit être un entier positif",
     "incrementalSyncMustBeAtLeast10": "L'intervalle de synchronisation incrémentielle doit être d'au moins 10 minutes",
     "incrementalSyncMustBeNumber": "L'intervalle de synchronisation incrémentielle doit être un nombre",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Adresse e-mail non valide",
     "invalidUrl": "URL non valide",
     "passwordMinLength": "Le mot de passe doit contenir au moins {{min}} caractères",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "La taille du lot doit être au plus 200",
     "singleRequestBatchSizeTooSmall": "La taille du lot doit être au moins 10"
   }
-}
+}

web/src/locales/it.json

@@ -115,6 +115,24 @@
     "continue": "Continua",
     "createdAt": "Creato Il",
     "creationFailed": "Creazione fallita, riprova più tardi",
+    "cronAdvanced": "Espressione avanzata",
+    "cronDaily": "Ogni giorno",
+    "cronDayOfMonth": "Giorno della settimana",
+    "cronDayOfWeek": "Giorno della settimana",
+    "cronFrequency": "Frequenza",
+    "cronFriday": "Venerdì",
+    "cronHour": "Ora",
+    "cronMinute": "Minuto",
+    "cronMonday": "Lunedì",
+    "cronMonthly": "Ogni mese",
+    "cronSaturday": "Sabato",
+    "cronSimple": "Espressione semplice",
+    "cronSunday": "Domenica",
+    "cronThursday": "Giovedì",
+    "cronTimezoneNote": "Orari nel fuso orario del server.",
+    "cronTuesday": "Martedì",
+    "cronWednesday": "Mercoledì",
+    "cronWeekly": "Ogni settimana",
     "dateSelection": "Selezione Data",
     "dateSince": "Data Da",
     "days": "Giorni",
@@ -133,6 +151,9 @@
     "downloadFailed": "Avvio attività di download non riuscito",
     "downloadInterval": "Intervallo di download (minuti)",
     "downloadIntervalPlaceholder": "Inserisci i minuti",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "Cron a 6 campi (sec min ora giorno mese giorno-sett) in ora del server. Sostituisce l'intervallo.",
+    "downloadSchedulePlaceholder": "es. 0 0 * * *",
     "downloadScope": "Strategia di download",
     "downloadScopeDescription": "Scegli quali email indicizzare e scaricare.",
     "downloadStarted": "Attività di download avviata",
@@ -156,9 +177,6 @@
     "everyMinutes": "ogni {{minutes}} minuti",
     "field": "Campo",
     "fixed": "Fissa",
-    "folderLimit": "Limite Cartelle",
-    "folderLimitDescription": "Limita il numero di email da sincronizzare per cartella (minimo 100). Lascia vuoto per nessun limite.",
-    "folderLimitPlaceholder": "es. 1000",
     "folderSync": {
       "autoSelectDescendants": "Seleziona automaticamente i discendenti",
       "autoSelectParents": "Seleziona automaticamente i genitori",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Salva Modifiche",
+    "scheduleMode": "Pianificazione del download",
+    "scheduleModeCron": "Espressione Cron",
+    "scheduleModeDescription": "Download a intervalli fissi o tramite espressioni Cron.",
+    "scheduleModeInterval": "Intervallo fisso",
     "selectAccountType": "Seleziona tipo di account",
     "selectAtLeastOneFolder": "Seleziona almeno una cartella",
     "selectAuthMethod": "Seleziona un metodo di autenticazione",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "L'email è obbligatoria",
-    "folderLimitMustBeAtLeast100": "Il limite di cartelle deve essere almeno 100",
-    "folderLimitMustBeNumber": "Il limite di cartelle deve essere un numero",
     "imapHostCannotBeEmpty": "L'host IMAP non può essere vuoto",
     "imapHostRequired": "L'host IMAP è obbligatorio",
     "imapPortMustBeLessThan65536": "La porta IMAP deve essere inferiore a 65536",
     "imapPortMustBePositive": "La porta IMAP deve essere un numero intero positivo",
     "incrementalSyncMustBeAtLeast10": "L'intervallo di sincronizzazione incrementale deve essere di almeno 10 minuti",
     "incrementalSyncMustBeNumber": "L'intervallo di sincronizzazione incrementale deve essere un numero",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Indirizzo email non valido",
     "invalidUrl": "URL non valido",
     "passwordMinLength": "La password deve contenere almeno {{min}} caratteri",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "La dimensione del batch deve essere al massimo 200",
     "singleRequestBatchSizeTooSmall": "La dimensione del batch deve essere almeno 10"
   }
-}
+}

web/src/locales/jp.json

@@ -115,6 +115,24 @@
     "continue": "続行",
     "createdAt": "作成日時",
     "creationFailed": "作成に失敗しました。しばらくしてからもう一度お試しください。",
+    "cronAdvanced": "高度な式",
+    "cronDaily": "毎日",
+    "cronDayOfMonth": "曜日",
+    "cronDayOfWeek": "曜日",
+    "cronFrequency": "頻度",
+    "cronFriday": "金曜日",
+    "cronHour": "时",
+    "cronMinute": "分",
+    "cronMonday": "月曜日",
+    "cronMonthly": "毎月",
+    "cronSaturday": "土曜日",
+    "cronSimple": "簡易式",
+    "cronSunday": "日曜日",
+    "cronThursday": "木曜日",
+    "cronTimezoneNote": "時間はサーバーの現地時間です。",
+    "cronTuesday": "火曜日",
+    "cronWednesday": "水曜日",
+    "cronWeekly": "毎週",
     "dateSelection": "日付選択",
     "dateSince": "同期開始日",
     "days": "日",
@@ -133,6 +151,9 @@
     "downloadFailed": "ダウンロードタスクの起動に失敗しました",
     "downloadInterval": "ダウンロード間隔 (分)",
     "downloadIntervalPlaceholder": "分を入力してください",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "サーバー時間の6フィールドCron式（秒分時日月曜日）。設定値より優先。",
+    "downloadSchedulePlaceholder": "例：0 0 * * *",
     "downloadScope": "ダウンロード戦略",
     "downloadScopeDescription": "インデックスとダウンロードの対象となるメールを選択してください。",
     "downloadStarted": "ダウンロードタスクを開始しました",
@@ -156,9 +177,6 @@
     "everyMinutes": "{{minutes}}分ごと",
     "field": "フィールド",
     "fixed": "固定",
-    "folderLimit": "フォルダーの制限",
-    "folderLimitDescription": "フォルダーごとに同期するメールの数を制限します（最小100）。制限なしにする場合は空欄にしてください。",
-    "folderLimitPlaceholder": "例: 1000",
     "folderSync": {
       "autoSelectDescendants": "子項目を自動選択",
       "autoSelectParents": "親項目を自動選択",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "変更を保存",
+    "scheduleMode": "ダウンロードスケジュール",
+    "scheduleModeCron": "Cron式",
+    "scheduleModeDescription": "固定間隔またはCron式でダウンロード。",
+    "scheduleModeInterval": "固定間隔",
     "selectAccountType": "アカウントの種類を選択",
     "selectAtLeastOneFolder": "少なくとも1つのフォルダーを選択してください",
     "selectAuthMethod": "認証方式を選択",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "メールアドレスは必須です",
-    "folderLimitMustBeAtLeast100": "フォルダーの制限は100以上である必要があります",
-    "folderLimitMustBeNumber": "フォルダーの制限は数値である必要があります",
     "imapHostCannotBeEmpty": "IMAPホストは空にできません",
     "imapHostRequired": "IMAPホストは必須です",
     "imapPortMustBeLessThan65536": "IMAPポートは65536未満である必要があります",
     "imapPortMustBePositive": "IMAPポートは正の整数である必要があります",
     "incrementalSyncMustBeAtLeast10": "増分同期間隔は10分以上である必要があります",
     "incrementalSyncMustBeNumber": "増分同期間隔は数値である必要があります",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "無効なメールアドレスです",
     "invalidUrl": "無効なURLです",
     "passwordMinLength": "パスワードは{{min}}文字以上である必要があります",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "バッチサイズは最大でも200でなければなりません",
     "singleRequestBatchSizeTooSmall": "バッチサイズは最低でも10でなければなりません"
   }
-}
+}

web/src/locales/ko.json

@@ -115,6 +115,24 @@
     "continue": "계속",
     "createdAt": "생성일",
     "creationFailed": "생성에 실패했습니다. 나중에 다시 시도하십시오.",
+    "cronAdvanced": "고급 표현식",
+    "cronDaily": "매일",
+    "cronDayOfMonth": "요일",
+    "cronDayOfWeek": "요일",
+    "cronFrequency": "주기",
+    "cronFriday": "금요일",
+    "cronHour": "시",
+    "cronMinute": "분",
+    "cronMonday": "월요일",
+    "cronMonthly": "매월",
+    "cronSaturday": "토요일",
+    "cronSimple": "간단한 표현식",
+    "cronSunday": "일요일",
+    "cronThursday": "목요일",
+    "cronTimezoneNote": "모든 시간은 서버 현지 시간 기준입니다.",
+    "cronTuesday": "화요일",
+    "cronWednesday": "수요일",
+    "cronWeekly": "매주",
     "dateSelection": "날짜 선택",
     "dateSince": "동기화 시작일",
     "days": "일",
@@ -133,6 +151,9 @@
     "downloadFailed": "다운로드 작업 시작 실패",
     "downloadInterval": "다운로드 주기 (분)",
     "downloadIntervalPlaceholder": "분 단위 입력",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "서버 시간 기준 6필드 Cron(초 분 시 일 월 요일). 간격 설정보다 우선됨.",
+    "downloadSchedulePlaceholder": "예: 0 0 * * *",
     "downloadScope": "다운로드 전략",
     "downloadScopeDescription": "색인화 및 다운로드할 이메일을 선택하십시오.",
     "downloadStarted": "다운로드 작업 시작됨",
@@ -156,9 +177,6 @@
     "everyMinutes": "매 {{minutes}}분",
     "field": "필드",
     "fixed": "고정",
-    "folderLimit": "폴더 제한",
-    "folderLimitDescription": "폴더당 동기화할 이메일 수를 제한합니다(최소 100). 제한이 없으면 비워 두십시오.",
-    "folderLimitPlaceholder": "예: 1000",
     "folderSync": {
       "autoSelectDescendants": "하위 항목 자동 선택",
       "autoSelectParents": "상위 항목 자동 선택",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "변경 사항 저장",
+    "scheduleMode": "다운로드 일정",
+    "scheduleModeCron": "Cron 표현식",
+    "scheduleModeDescription": "고정 간격 또는 Cron 표현식으로 다운로드.",
+    "scheduleModeInterval": "고정 간격",
     "selectAccountType": "계정 유형 선택",
     "selectAtLeastOneFolder": "하나 이상의 폴더를 선택하십시오",
     "selectAuthMethod": "인증 방법 선택",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "이메일 주소는 필수입니다",
-    "folderLimitMustBeAtLeast100": "폴더 제한은 최소 100 이상이어야 합니다",
-    "folderLimitMustBeNumber": "폴더 제한은 숫자여야 합니다",
     "imapHostCannotBeEmpty": "IMAP 호스트는 비워 둘 수 없습니다",
     "imapHostRequired": "IMAP 호스트는 필수입니다",
     "imapPortMustBeLessThan65536": "IMAP 포트는 65536보다 작아야 합니다",
     "imapPortMustBePositive": "IMAP 포트는 양의 정수여야 합니다",
     "incrementalSyncMustBeAtLeast10": "증분 동기화 간격은 최소 10분 이상이어야 합니다",
     "incrementalSyncMustBeNumber": "증분 동기화 간격은 숫자여야 합니다",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "유효하지 않은 이메일 주소",
     "invalidUrl": "유효하지 않은 URL",
     "passwordMinLength": "비밀번호는 {{min}}자 이상이어야 합니다",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "배치 크기는 최대 200이어야 합니다",
     "singleRequestBatchSizeTooSmall": "배치 크기는 최소 10이어야 합니다"
   }
-}
+}

web/src/locales/nl.json

@@ -115,6 +115,24 @@
     "continue": "Doorgaan",
     "createdAt": "Aangemaakt Op",
     "creationFailed": "Aanmaken mislukt, probeer het later opnieuw",
+    "cronAdvanced": "Geavanceerde expressie",
+    "cronDaily": "Dagelijks",
+    "cronDayOfMonth": "Dag van de week",
+    "cronDayOfWeek": "Dag van de week",
+    "cronFrequency": "Frequentie",
+    "cronFriday": "Vrijdag",
+    "cronHour": "Uur",
+    "cronMinute": "Minuut",
+    "cronMonday": "Maandag",
+    "cronMonthly": "Maandelijks",
+    "cronSaturday": "Zaterdag",
+    "cronSimple": "Simpele expressie",
+    "cronSunday": "Zondag",
+    "cronThursday": "Donderdag",
+    "cronTimezoneNote": "Alle tijden zijn server-lokale tijd.",
+    "cronTuesday": "Dinsdag",
+    "cronWednesday": "Woensdag",
+    "cronWeekly": "Wekelijks",
     "dateSelection": "Datumselectie",
     "dateSince": "Datum Sinds",
     "days": "Dagen",
@@ -133,6 +151,9 @@
     "downloadFailed": "Downloadtaak starten mislukt",
     "downloadInterval": "Download-interval (minuten)",
     "downloadIntervalPlaceholder": "Voer minuten in",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-velds Cron (sec min uur dag maand dag-week) in servertijd. Overschrijft interval.",
+    "downloadSchedulePlaceholder": "bijv. 0 0 * * *",
     "downloadScope": "Downloadstrategie",
     "downloadScopeDescription": "Kies welke e-mails moeten worden geïndexeerd en gedownload.",
     "downloadStarted": "Downloadtaak gestart",
@@ -156,9 +177,6 @@
     "everyMinutes": "elke {{minutes}} minuten",
     "field": "Veld",
     "fixed": "Vast",
-    "folderLimit": "Mappenlimiet",
-    "folderLimitDescription": "Beperk het aantal te synchroniseren e-mails per map (minimaal 100). Laat leeg voor geen limiet.",
-    "folderLimitPlaceholder": "bv. 1000",
     "folderSync": {
       "autoSelectDescendants": "Automatisch onderliggende items selecteren",
       "autoSelectParents": "Automatisch bovenliggende items selecteren",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Wijzigingen opslaan",
+    "scheduleMode": "Downloadschema",
+    "scheduleModeCron": "Cron-expressie",
+    "scheduleModeDescription": "Downloaden via vaste intervallen o f Cron-expressies.",
+    "scheduleModeInterval": "Vast interval",
     "selectAccountType": "Selecteer accounttype",
     "selectAtLeastOneFolder": "Selecteer alstublieft ten minste één map",
     "selectAuthMethod": "Selecteer een authenticatiemethode",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "E-mail is vereist",
-    "folderLimitMustBeAtLeast100": "Mappenlimiet moet ten minste 100 zijn",
-    "folderLimitMustBeNumber": "Mappenlimiet moet een nummer zijn",
     "imapHostCannotBeEmpty": "IMAP host mag niet leeg zijn",
     "imapHostRequired": "IMAP host is vereist",
     "imapPortMustBeLessThan65536": "IMAP poort moet kleiner zijn dan 65536",
     "imapPortMustBePositive": "IMAP poort moet een positief geheel getal zijn",
     "incrementalSyncMustBeAtLeast10": "Incrementaal sync interval moet ten minste 10 minuten zijn",
     "incrementalSyncMustBeNumber": "Incrementaal sync interval moet een nummer zijn",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Ongeldig e-mailadres",
     "invalidUrl": "Ongeldige URL",
     "passwordMinLength": "Wachtwoord moet ten minste {{min}} tekens lang zijn",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Batch‑grootte moet hoogstens 200 zijn",
     "singleRequestBatchSizeTooSmall": "Batch‑grootte moet ten minste 10 zijn"
   }
-}
+}

web/src/locales/no.json

@@ -115,6 +115,24 @@
     "continue": "Fortsett",
     "createdAt": "Opprettet",
     "creationFailed": "Opprettelse mislyktes, prøv igjen senere",
+    "cronAdvanced": "Avansert uttrykk",
+    "cronDaily": "Daglig",
+    "cronDayOfMonth": "Ugedag",
+    "cronDayOfWeek": "Ugedag",
+    "cronFrequency": "Frekvens",
+    "cronFriday": "Fredag",
+    "cronHour": "Time",
+    "cronMinute": "Minutt",
+    "cronMonday": "Mandag",
+    "cronMonthly": "Månedlig",
+    "cronSaturday": "Lørdag",
+    "cronSimple": "Enkelt uttrykk",
+    "cronSunday": "Søndag",
+    "cronThursday": "Torsdag",
+    "cronTimezoneNote": "Alle klokkeslett er serverens lokaltid.",
+    "cronTuesday": "Tirsdag",
+    "cronWednesday": "Onsdag",
+    "cronWeekly": "Ukentlig",
     "dateSelection": "Datovalg",
     "dateSince": "Dato siden",
     "days": "Dager",
@@ -133,6 +151,9 @@
     "downloadFailed": "Kunne ikke starte nedlastingsoppgave",
     "downloadInterval": "Nedlastingsintervall (minutter)",
     "downloadIntervalPlaceholder": "Skriv inn minutter",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-felts Cron (sek min time dag mdr ukedag) i servertid. Overstyrer intervall.",
+    "downloadSchedulePlaceholder": "f.eks.: 0 0 * * *",
     "downloadScope": "Nedlastingsstrategi",
     "downloadScopeDescription": "Velg hvilke e-poster som skal indekseres og lastes ned.",
     "downloadStarted": "Nedlastingsoppgave startet",
@@ -156,9 +177,6 @@
     "everyMinutes": "hvert {{minutes}} minutt",
     "field": "Felt",
     "fixed": "Fast",
-    "folderLimit": "Mappegrense",
-    "folderLimitDescription": "Begrens antall e-poster som skal synkroniseres per mappe (minimum 100). La stå tomt for ingen grense.",
-    "folderLimitPlaceholder": "f.eks. 1000",
     "folderSync": {
       "autoSelectDescendants": "Velg etterkommere automatisk",
       "autoSelectParents": "Velg foreldre automatisk",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Lagre endringer",
+    "scheduleMode": "Nedlastingsplan",
+    "scheduleModeCron": "Cron-uttrykk",
+    "scheduleModeDescription": "Nedlasting med faste intervaller eller Cron-uttrykk.",
+    "scheduleModeInterval": "Fast intervall",
     "selectAccountType": "Velg kontotype",
     "selectAtLeastOneFolder": "Vennligst velg minst én mappe",
     "selectAuthMethod": "Velg en autentiseringsmetode",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "E-post er påkrevd",
-    "folderLimitMustBeAtLeast100": "Mappegrense må være minst 100",
-    "folderLimitMustBeNumber": "Mappegrense må være et tall",
     "imapHostCannotBeEmpty": "IMAP-vert kan ikke være tom",
     "imapHostRequired": "IMAP-vert er påkrevd",
     "imapPortMustBeLessThan65536": "IMAP-port må være mindre enn 65536",
     "imapPortMustBePositive": "IMAP-port må være et positivt heltall",
     "incrementalSyncMustBeAtLeast10": "Intervall for inkrementell synkronisering må være minst 10 minutter",
     "incrementalSyncMustBeNumber": "Intervall for inkrementell synkronisering må være et tall",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Ugyldig e-postadresse",
     "invalidUrl": "Ugyldig URL",
     "passwordMinLength": "Passordet må være minst {{min}} tegn langt",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Batchstørrelse må være maksimalt 200",
     "singleRequestBatchSizeTooSmall": "Batchstørrelse må være minst 10"
   }
-}
+}

web/src/locales/pl.json

@@ -115,6 +115,24 @@
     "continue": "Kontynuj",
     "createdAt": "Utworzono",
     "creationFailed": "Bład tworzenia, spróbuj później",
+    "cronAdvanced": "Zaawansowane wyrażenie",
+    "cronDaily": "Codziennie",
+    "cronDayOfMonth": "Dzień tygodnia",
+    "cronDayOfWeek": "Dzień tygodnia",
+    "cronFrequency": "Częstotliwość",
+    "cronFriday": "Piątek",
+    "cronHour": "Godzina",
+    "cronMinute": "Minuta",
+    "cronMonday": "Poniedziałek",
+    "cronMonthly": "Co miesiąc",
+    "cronSaturday": "Sobota",
+    "cronSimple": "Proste wyrażenie",
+    "cronSunday": "Niedziela",
+    "cronThursday": "Czwartek",
+    "cronTimezoneNote": "Czas według lokalnej strefy serwera.",
+    "cronTuesday": "Wtorek",
+    "cronWednesday": "Środa",
+    "cronWeekly": "Co tydzień",
     "dateSelection": "Zaznaczenie daty",
     "dateSince": "Od kiedy",
     "days": "Dni",
@@ -133,6 +151,9 @@
     "downloadFailed": "Nie udało się uruchomić zadania pobierania",
     "downloadInterval": "Cykl pobierania (minuty)",
     "downloadIntervalPlaceholder": "Wprowadź minuty",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-polowy Cron (sek min godz dz msc dz-tyg) w czasie serwera. Nadpisuje interwał.",
+    "downloadSchedulePlaceholder": "np. 0 0 * * *",
     "downloadScope": "Strategia pobierania",
     "downloadScopeDescription": "Wybierz, które wiadomości e-mail mają być indeksowane i pobierane.",
     "downloadStarted": "Uruchomiono zadanie pobierania",
@@ -156,9 +177,6 @@
     "everyMinutes": "co {{minutes}} minut",
     "field": "Pole",
     "fixed": "Dokładnie",
-    "folderLimit": "Limit folderu",
-    "folderLimitDescription": "Ogranicz liczbę wiadomości email, które należy synchronizować w jednym folderze (minimum 100). Pozostaw puste, aby nie było limitu.",
-    "folderLimitPlaceholder": "np. 1000",
     "folderSync": {
       "autoSelectDescendants": "Automatyczny wybór dzieci (podrzędnych)",
       "autoSelectParents": "Automatyczny wybór rodziców (nadrzędnych)",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Zapisz zmiany",
+    "scheduleMode": "Harmonogram pobierania",
+    "scheduleModeCron": "Wyrażenie Cron",
+    "scheduleModeDescription": "Pobieranie w stałych odstępach lub przez wyrażenia Cron.",
+    "scheduleModeInterval": "Stały odstęp",
     "selectAccountType": "Wybierz typ konta",
     "selectAtLeastOneFolder": "Wybierz co najmniej jeden folder",
     "selectAuthMethod": "Zaznacz metodę uwierzytelniania IMAP",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "Email jest wymagany",
-    "folderLimitMustBeAtLeast100": "Limit folderów musi być liczbą nie mniejszą niż 100",
-    "folderLimitMustBeNumber": "Limit folderów musi być liczbą",
     "imapHostCannotBeEmpty": "Host IMAP nie może być pusty",
     "imapHostRequired": "Host IMAP jest wymagany",
     "imapPortMustBeLessThan65536": "Port IMAP musi być liczbą w przedziale 0-65535",
     "imapPortMustBePositive": "Port IMAP musi być liczbą całkowitą dodatnią",
     "incrementalSyncMustBeAtLeast10": "Przyrostowy interwał synchronizacji musi wynosić co najmniej 10 minut",
     "incrementalSyncMustBeNumber": "Przyrostowy interwał synchronizacji musi być liczbą",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Niewłaściwy adres email",
     "invalidUrl": "Niewłaściwy URL",
     "passwordMinLength": "Hasło musi posiadać conajmniej {{min}} znaków",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Rozmiar partii może wynosić maksymalnie 200",
     "singleRequestBatchSizeTooSmall": "Rozmiar partii musi wynosić co najmniej 10"
   }
-}
+}

web/src/locales/pt.json

@@ -115,6 +115,24 @@
     "continue": "Continuar",
     "createdAt": "Criado Em",
     "creationFailed": "Falha na criação, por favor, tente novamente mais tarde.",
+    "cronAdvanced": "Expressão avançada",
+    "cronDaily": "Diariamente",
+    "cronDayOfMonth": "Dia da semana",
+    "cronDayOfWeek": "Dia da semana",
+    "cronFrequency": "Frequência",
+    "cronFriday": "Sexta-feira",
+    "cronHour": "Hora",
+    "cronMinute": "Minuto",
+    "cronMonday": "Segunda-feira",
+    "cronMonthly": "Mensalmente",
+    "cronSaturday": "Sábado",
+    "cronSimple": "Expressão simples",
+    "cronSunday": "Domingo",
+    "cronThursday": "Quinta-feira",
+    "cronTimezoneNote": "Horários no fuso horário do servidor.",
+    "cronTuesday": "Terça-feira",
+    "cronWednesday": "Quarta-feira",
+    "cronWeekly": "Semanalmente",
     "dateSelection": "Seleção de Data",
     "dateSince": "Data de Início da Sincronização",
     "days": "Dias",
@@ -133,6 +151,9 @@
     "downloadFailed": "Falha ao iniciar tarefa de download",
     "downloadInterval": "Intervalo de download (minutos)",
     "downloadIntervalPlaceholder": "Insira os minutos",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "Cron de 6 campos (seg min hora dia mês dia-sem) na hora do servidor. Substitui o intervalo.",
+    "downloadSchedulePlaceholder": "ex: 0 0 * * *",
     "downloadScope": "Estratégia de download",
     "downloadScopeDescription": "Escolha quais e-mails devem ser indexados e baixados.",
     "downloadStarted": "Tarefa de download iniciada",
@@ -156,9 +177,6 @@
     "everyMinutes": "A cada {{minutes}} minutos",
     "field": "Campo",
     "fixed": "Fixo",
-    "folderLimit": "Limite de Pasta",
-    "folderLimitDescription": "Limita o número de emails a sincronizar por pasta (mínimo 100). Deixe vazio para nenhum limite.",
-    "folderLimitPlaceholder": "Ex: 1000",
     "folderSync": {
       "autoSelectDescendants": "Selecionar automaticamente os descendentes",
       "autoSelectParents": "Selecionar automaticamente os pais",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Salvar Alterações",
+    "scheduleMode": "Agendamento de download",
+    "scheduleModeCron": "Expressão Cron",
+    "scheduleModeDescription": "Download por intervalos fixos ou expressões Cron.",
+    "scheduleModeInterval": "Intervalo fixo",
     "selectAccountType": "Selecionar tipo de conta",
     "selectAtLeastOneFolder": "Por favor, selecione pelo menos uma pasta",
     "selectAuthMethod": "Selecionar Método de Autenticação",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "O endereço de email é obrigatório",
-    "folderLimitMustBeAtLeast100": "O Limite de Pasta deve ser pelo menos 100",
-    "folderLimitMustBeNumber": "O Limite de Pasta deve ser um número",
     "imapHostCannotBeEmpty": "O Host IMAP não pode estar vazio",
     "imapHostRequired": "O Host IMAP é obrigatório",
     "imapPortMustBeLessThan65536": "A Porta IMAP deve ser menor que 65536",
     "imapPortMustBePositive": "A Porta IMAP deve ser um número inteiro positivo",
     "incrementalSyncMustBeAtLeast10": "O Intervalo de Sincronização Incremental deve ser de pelo menos 10 minutos",
     "incrementalSyncMustBeNumber": "O Intervalo de Sincronização Incremental deve ser um número",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Endereço de email inválido",
     "invalidUrl": "URL inválido",
     "passwordMinLength": "A senha deve ter pelo menos {{min}} caracteres",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "O tamanho do lote deve ser no máximo 200",
     "singleRequestBatchSizeTooSmall": "O tamanho do lote deve ser pelo menos 10"
   }
-}
+}

web/src/locales/ru.json

@@ -115,6 +115,24 @@
     "continue": "Продолжить",
     "createdAt": "Создано",
     "creationFailed": "Ошибка создания, попробуйте позже",
+    "cronAdvanced": "Расширенное выражение",
+    "cronDaily": "Ежедневно",
+    "cronDayOfMonth": "День недели",
+    "cronDayOfWeek": "День недели",
+    "cronFrequency": "Частота",
+    "cronFriday": "Пятница",
+    "cronHour": "Час",
+    "cronMinute": "Минута",
+    "cronMonday": "Понедельник",
+    "cronMonthly": "Ежемесячно",
+    "cronSaturday": "Суббота",
+    "cronSimple": "Простое выражение",
+    "cronSunday": "Воскресенье",
+    "cronThursday": "Четверг",
+    "cronTimezoneNote": "Время по местному часовому поясу сервера.",
+    "cronTuesday": "Вторник",
+    "cronWednesday": "Среда",
+    "cronWeekly": "Еженедельно",
     "dateSelection": "Выбор даты",
     "dateSince": "Дата с",
     "days": "Дни",
@@ -133,6 +151,9 @@
     "downloadFailed": "Не удалось запустить задачу загрузки",
     "downloadInterval": "Интервал загрузки (мин.)",
     "downloadIntervalPlaceholder": "Введите минуты",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-польный Cron (сек мин час день мес день-нед) по времени сервера. Меняет интервал.",
+    "downloadSchedulePlaceholder": "напр., 0 0 * * *",
     "downloadScope": "Стратегия загрузки",
     "downloadScopeDescription": "Выберите, какие электронные письма должны быть проиндексированы и скачаны.",
     "downloadStarted": "Задача загрузки запущена",
@@ -156,9 +177,6 @@
     "everyMinutes": "каждые {{minutes}} мин.",
     "field": "Поле",
     "fixed": "Фиксированная",
-    "folderLimit": "Лимит папки",
-    "folderLimitDescription": "Ограничить количество писем для синхронизации в папке (минимум 100). Оставьте пустым для снятия ограничений.",
-    "folderLimitPlaceholder": "например, 1000",
     "folderSync": {
       "autoSelectDescendants": "Автоматически выбирать дочерние элементы",
       "autoSelectParents": "Автоматически выбирать родительские элементы",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Сохранить изменения",
+    "scheduleMode": "Расписание загрузки",
+    "scheduleModeCron": "Выражение Cron",
+    "scheduleModeDescription": "Загрузка с фиксированным интервалом или по Cron.",
+    "scheduleModeInterval": "Фиксированный интервал",
     "selectAccountType": "Выберите тип аккаунта",
     "selectAtLeastOneFolder": "Пожалуйста, выберите хотя бы одну папку",
     "selectAuthMethod": "Выберите метод авторизации",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "Email обязателен",
-    "folderLimitMustBeAtLeast100": "Лимит папки должен быть не менее 100",
-    "folderLimitMustBeNumber": "Лимит папки должен быть числом",
     "imapHostCannotBeEmpty": "IMAP хост не может быть пустым",
     "imapHostRequired": "IMAP хост обязателен",
     "imapPortMustBeLessThan65536": "IMAP порт должен быть меньше 65536",
     "imapPortMustBePositive": "IMAP порт должен быть положительным целым числом",
     "incrementalSyncMustBeAtLeast10": "Интервал инкрементальной синхронизации должен быть не менее 10 минут",
     "incrementalSyncMustBeNumber": "Интервал инкрементальной синхронизации должен быть числом",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Неверный адрес электронной почты",
     "invalidUrl": "Неверный URL",
     "passwordMinLength": "Пароль должен быть не менее {{min}} символов",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Размер пакета должен быть не более 200",
     "singleRequestBatchSizeTooSmall": "Размер пакета должен быть не менее 10"
   }
-}
+}

web/src/locales/sv.json

@@ -115,6 +115,24 @@
     "continue": "Fortsätt",
     "createdAt": "Skapad",
     "creationFailed": "Skapande misslyckades, försök igen senare",
+    "cronAdvanced": "Avancerat uttryck",
+    "cronDaily": "Dagligen",
+    "cronDayOfMonth": "Veckodag",
+    "cronDayOfWeek": "Veckodag",
+    "cronFrequency": "Frekvens",
+    "cronFriday": "Fredag",
+    "cronHour": "Timme",
+    "cronMinute": "Minut",
+    "cronMonday": "Måndag",
+    "cronMonthly": "Månadsvis",
+    "cronSaturday": "Lördag",
+    "cronSimple": "Enkelt uttryck",
+    "cronSunday": "Söndag",
+    "cronThursday": "Torsdag",
+    "cronTimezoneNote": "Alla tider visas i serverns lokaltid.",
+    "cronTuesday": "Tisdag",
+    "cronWednesday": "Onsdag",
+    "cronWeekly": "Veckovis",
     "dateSelection": "Datumsval",
     "dateSince": "Datum från",
     "days": "Dagar",
@@ -133,6 +151,9 @@
     "downloadFailed": "Misslyckades med att starta hämtningsuppgift",
     "downloadInterval": "Nedladdningsintervall (minuter)",
     "downloadIntervalPlaceholder": "Ange minuter",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "6-fälts Cron (sek min tim dag mån veckodag) i servertid. Ersätter intervall.",
+    "downloadSchedulePlaceholder": "t.ex. 0 0 * * *",
     "downloadScope": "Nedladdningsstrategi",
     "downloadScopeDescription": "Välj vilka e-postmeddelanden som ska indexeras och laddas ner.",
     "downloadStarted": "Hämtningsuppgift startad",
@@ -156,9 +177,6 @@
     "everyMinutes": "varje {{minutes}} minut",
     "field": "Fält",
     "fixed": "Fast",
-    "folderLimit": "Mappgräns",
-    "folderLimitDescription": "Begränsa antalet e-postmeddelanden att synkronisera per mapp (minst 100). Lämna tomt för ingen gräns.",
-    "folderLimitPlaceholder": "t.ex. 1000",
     "folderSync": {
       "autoSelectDescendants": "Välj underordnade automatiskt",
       "autoSelectParents": "Välj överordnade automatiskt",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "Spara ändringar",
+    "scheduleMode": "Hämtningsschema",
+    "scheduleModeCron": "Cron-uttryck",
+    "scheduleModeDescription": "Hämta med fasta intervall eller Cron-uttryck.",
+    "scheduleModeInterval": "Fast intervall",
     "selectAccountType": "Välj kontotyp",
     "selectAtLeastOneFolder": "Vänligen välj minst en mapp",
     "selectAuthMethod": "Välj en autentiseringsmetod",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "E-post krävs",
-    "folderLimitMustBeAtLeast100": "Mappgräns måste vara minst 100",
-    "folderLimitMustBeNumber": "Mappgräns måste vara ett tal",
     "imapHostCannotBeEmpty": "IMAP-värd kan inte vara tom",
     "imapHostRequired": "IMAP-värd krävs",
     "imapPortMustBeLessThan65536": "IMAP-port måste vara mindre än 65536",
     "imapPortMustBePositive": "IMAP-port måste vara ett positivt heltal",
     "incrementalSyncMustBeAtLeast10": "Intervall för inkrementell synkronisering måste vara minst 10 minuter",
     "incrementalSyncMustBeNumber": "Intervall för inkrementell synkronisering måste vara ett tal",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "Ogiltig e-postadress",
     "invalidUrl": "Ogiltig URL",
     "passwordMinLength": "Lösenordet måste vara minst {{min}} tecken långt",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "Batchstorlek måste vara högst 200",
     "singleRequestBatchSizeTooSmall": "Batchstorlek måste vara minst 10"
   }
-}
+}

web/src/locales/zh-tw.json

@@ -115,6 +115,24 @@
     "continue": "繼續",
     "createdAt": "建立時間",
     "creationFailed": "建立失敗，請稍後再試。",
+    "cronAdvanced": "高級表達式",
+    "cronDaily": "每天",
+    "cronDayOfMonth": "星期",
+    "cronDayOfWeek": "星期",
+    "cronFrequency": "頻率",
+    "cronFriday": "星期五",
+    "cronHour": "小時",
+    "cronMinute": "分鐘",
+    "cronMonday": "星期一",
+    "cronMonthly": "每月",
+    "cronSaturday": "星期六",
+    "cronSimple": "简易表達式",
+    "cronSunday": "星期日",
+    "cronThursday": "星期四",
+    "cronTimezoneNote": "所有時間均使用伺服器在地時區。",
+    "cronTuesday": "星期二",
+    "cronWednesday": "星期三",
+    "cronWeekly": "每周",
     "dateSelection": "日期選擇",
     "dateSince": "同步起始日期",
     "days": "天",
@@ -133,6 +151,9 @@
     "downloadFailed": "啟動下載任務失敗",
     "downloadInterval": "下載週期 (分鐘)",
     "downloadIntervalPlaceholder": "請輸入分鐘數",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "伺服器時間的 6 位 Cron 表達式（秒分時日月週），提供時覆蓋間隔設定。",
+    "downloadSchedulePlaceholder": "例如：0 0 * * *",
     "downloadScope": "下載策略",
     "downloadScopeDescription": "選擇哪些郵件應被索引和下載。",
     "downloadStarted": "下載任務已啟動",
@@ -156,9 +177,6 @@
     "everyMinutes": "每 {{minutes}} 分鐘",
     "field": "欄位",
     "fixed": "固定",
-    "folderLimit": "資料夾限制",
-    "folderLimitDescription": "限制每個資料夾要同步的郵件數量（最小 100）。若無限制請留空。",
-    "folderLimitPlaceholder": "例如：1000",
     "folderSync": {
       "autoSelectDescendants": "自動選取子項",
       "autoSelectParents": "自動選取父項",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "儲存變更",
+    "scheduleMode": "下載排程",
+    "scheduleModeCron": "Cron 表達式",
+    "scheduleModeDescription": "設定固定間隔或 Cron 表達式下載郵件。",
+    "scheduleModeInterval": "固定間隔",
     "selectAccountType": "選擇郵件帳戶類型",
     "selectAtLeastOneFolder": "請至少選擇一個資料夾",
     "selectAuthMethod": "選擇驗證方法",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "電子郵件地址為必填項",
-    "folderLimitMustBeAtLeast100": "資料夾限制必須至少為 100",
-    "folderLimitMustBeNumber": "資料夾限制必須是數字",
     "imapHostCannotBeEmpty": "IMAP 主機不可為空",
     "imapHostRequired": "IMAP 主機為必填項",
     "imapPortMustBeLessThan65536": "IMAP 連接埠必須小於 65536",
     "imapPortMustBePositive": "IMAP 連接埠必須是正整數",
     "incrementalSyncMustBeAtLeast10": "增量同步間隔必須至少為 10 分鐘",
     "incrementalSyncMustBeNumber": "增量同步間隔必須是數字",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "無效的電子郵件地址",
     "invalidUrl": "無效的網址",
     "passwordMinLength": "密碼長度必須至少 {{min}} 個字元",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "批次大小必須最多為200",
     "singleRequestBatchSizeTooSmall": "批次大小必須至少為10"
   }
-}
+}

web/src/locales/zh.json

@@ -115,6 +115,24 @@
     "continue": "继续",
     "createdAt": "创建时间",
     "creationFailed": "创建失败，请稍后重试",
+    "cronAdvanced": "高级表达式",
+    "cronDaily": "每天",
+    "cronDayOfMonth": "星期",
+    "cronDayOfWeek": "星期",
+    "cronFrequency": "频率",
+    "cronFriday": "星期五",
+    "cronHour": "小时",
+    "cronMinute": "分钟",
+    "cronMonday": "星期一",
+    "cronMonthly": "每月",
+    "cronSaturday": "星期六",
+    "cronSimple": "简易表达式",
+    "cronSunday": "星期日",
+    "cronThursday": "星期四",
+    "cronTimezoneNote": "所有时间均使用服务器本地时区。",
+    "cronTuesday": "星期二",
+    "cronWednesday": "星期三",
+    "cronWeekly": "每周",
     "dateSelection": "日期选择",
     "dateSince": "起始日期",
     "days": "天",
@@ -133,6 +151,9 @@
     "downloadFailed": "启动下载任务失败",
     "downloadInterval": "下载周期 (分钟)",
     "downloadIntervalPlaceholder": "请输入分钟数",
+    "downloadSchedule": "Cron Schedule",
+    "downloadScheduleDescription": "服务器时间的 6 位 Cron 表达式（秒分时日月周），提供时覆盖间隔设置。",
+    "downloadSchedulePlaceholder": "例如：0 0 * * *",
     "downloadScope": "下载策略",
     "downloadScopeDescription": "选择哪些邮件应被索引和下载。",
     "downloadStarted": "下载任务已启动",
@@ -156,9 +177,6 @@
     "everyMinutes": "每 {{minutes}} 分钟",
     "field": "字段",
     "fixed": "固定",
-    "folderLimit": "文件夹限制",
-    "folderLimitDescription": "限制每个文件夹同步的邮件数量（最少 100）。留空表示不限制。",
-    "folderLimitPlaceholder": "例如 1000",
     "folderSync": {
       "autoSelectDescendants": "自动选择子项",
       "autoSelectParents": "自动选择父项",
@@ -247,6 +265,10 @@
       }
     },
     "saveChanges": "保存更改",
+    "scheduleMode": "下载调度",
+    "scheduleModeCron": "Cron 表达式",
+    "scheduleModeDescription": "设置固定间隔或 Cron 表达式下载邮件。",
+    "scheduleModeInterval": "固定间隔",
     "selectAccountType": "选择邮件账户类型",
     "selectAtLeastOneFolder": "请至少选择一个文件夹",
     "selectAuthMethod": "选择认证方法",
@@ -1650,14 +1672,13 @@
   },
   "validation": {
     "emailRequired": "邮箱为必填项",
-    "folderLimitMustBeAtLeast100": "文件夹限制必须至少为 100",
-    "folderLimitMustBeNumber": "文件夹限制必须是数字",
     "imapHostCannotBeEmpty": "IMAP 主机不能为空",
     "imapHostRequired": "IMAP 主机为必填项",
     "imapPortMustBeLessThan65536": "IMAP 端口必须小于 65536",
     "imapPortMustBePositive": "IMAP 端口必须是正整数",
     "incrementalSyncMustBeAtLeast10": "增量同步间隔必须至少为 10 分钟",
     "incrementalSyncMustBeNumber": "增量同步间隔必须是数字",
+    "invalidCronExpression": "Invalid cron expression. Must be 6 fields: second minute hour day-of-month month day-of-week (e.g. '0 0 0 * * *')",
     "invalidEmail": "无效的电子邮件地址",
     "invalidUrl": "无效的 URL",
     "passwordMinLength": "密码长度至少为 {{min}} 个字符",
@@ -1669,4 +1690,4 @@
     "singleRequestBatchSizeTooLarge": "批大小必须最多为200",
     "singleRequestBatchSizeTooSmall": "批大小必须至少为10"
   }
-}
+}