feat(imap): gap-fill missing-mail repair with live progress UI

2026-08-31 01:52:30 +00:00 · 2026-08-06 01:18:20 +08:00
parent 75d345b742
commit ed02c642c8
31 changed files with 1589 additions and 62 deletions
--- a/web/src/api/account/api.ts
+++ b/web/src/api/account/api.ts
@@ -67,6 +67,35 @@ export interface AccountError {
    error: string;
 }

+export interface GapFillFolderStats {
+    downloaded: number;
+    failed: number;
+    candidate_count: number;
+    message?: string | null;
+}
+
+export enum GapFillStatus {
+    Running = "Running",
+    Success = "Success",
+    Failed = "Failed",
+    Cancelled = "Cancelled",
+}
+
+export interface GapFillRun {
+    started_at: number;
+    finished_at: number | null;
+    status: GapFillStatus;
+    folders: Record<string, GapFillFolderStats>;
+    downloaded: number;
+    failed: number;
+}
+
+export interface GapFillState {
+    account_id: number;
+    active: GapFillRun | null;
+    history: GapFillRun[];
+}
+
 export interface DownloadSession {
    start_time: number;
    end_time: number | null;
@@ -168,6 +197,11 @@ export const download_state = async (account_id: number) => {
    return response.data;
 };

+export const gap_fill_state = async (account_id: number) => {
+    const response = await axiosInstance.get<GapFillState>(`api/v1/accounts/${account_id}/gap-fill-stats`);
+    return response.data;
+};
+
 export const create_account = async (data: Record<string, any>) => {
    const response = await axiosInstance.post("api/v1/account", data);
    return response.data;
@@ -189,8 +223,8 @@ export const remove_account = async (account_id: number) => {
 };


-export const start_account_download = async (account_id: number) => {
-    const response = await axiosInstance.post(`api/v1/accounts/${account_id}/start-download`);
+export const start_account_download = async (account_id: number, run_gap_fill = false) => {
+    const response = await axiosInstance.post(`api/v1/accounts/${account_id}/start-download`, { run_gap_fill });
    return response.data;
 };

--- a/web/src/features/accounts/components/data-table-row-actions.tsx
+++ b/web/src/features/accounts/components/data-table-row-actions.tsx
@@ -17,6 +17,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.


+import { useState } from 'react'
 import { DotsHorizontalIcon } from '@radix-ui/react-icons'
 import { Row } from '@tanstack/react-table'
 import { IconEdit, IconPlayerPlay, IconPlayerStop, IconShieldLock, IconTrash } from '@tabler/icons-react'
@@ -33,9 +34,10 @@ import { useAccountContext } from '../context'
 import { Mailbox, MessageSquareMore, Settings } from 'lucide-react'
 import { useTranslation } from 'react-i18next'
 import { useCurrentUser } from '@/hooks/use-current-user'
-import { AccountModel, cancel_account_download, start_account_download } from '@/api/account/api'
+import { AccountModel, cancel_account_download } from '@/api/account/api'
 import { toast } from '@/hooks/use-toast'
 import { useNavigate } from '@tanstack/react-router'
+import { StartDownloadDialog } from './start-download-dialog'

 interface DataTableRowActionsProps {
  row: Row<AccountModel>
@@ -45,6 +47,7 @@ export function DataTableRowActions({ row }: DataTableRowActionsProps) {
  const { t } = useTranslation()
  const { setOpen, setCurrentRow } = useAccountContext()
  const navigate = useNavigate()
+  const [startDialogOpen, setStartDialogOpen] = useState(false)

  const account_type = row.original.account_type;
  const { require_any_permission } = useCurrentUser()
@@ -64,16 +67,7 @@ export function DataTableRowActions({ row }: DataTableRowActionsProps) {
  const showDownload = !isDeleting && account_type === 'IMAP' && hasPermission;

  const handleStartDownload = async () => {
-    try {
-      await start_account_download(row.original.id);
-      toast({ title: t('accounts.downloadStarted') });
-    } catch (error: any) {
-      toast({
-        variant: "destructive",
-        title: t('accounts.downloadFailed'),
-        description: error.response?.data?.message || error.message
-      });
-    }
+    setStartDialogOpen(true)
  }


@@ -198,6 +192,11 @@ export function DataTableRowActions({ row }: DataTableRowActionsProps) {
          </DropdownMenuItem>}
        </DropdownMenuContent>
      </DropdownMenu>
+      <StartDownloadDialog
+        row={row.original}
+        open={startDialogOpen}
+        onOpenChange={setStartDialogOpen}
+      />
    </>
  )
 }
--- a/web/src/features/accounts/components/running-state-dialog.tsx
+++ b/web/src/features/accounts/components/running-state-dialog.tsx
@@ -27,7 +27,7 @@ import {
 import { Button } from '@/components/ui/button'
 import { useQuery } from '@tanstack/react-query'
 import { useEffect, useState } from 'react'
-import { download_state, DownloadStatus, AccountModel, FolderProgress } from '@/api/account/api'
+import { download_state, gap_fill_state, DownloadStatus, AccountModel, FolderProgress, GapFillRun, GapFillStatus } from '@/api/account/api'
 import { format } from 'date-fns'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import { Badge } from '@/components/ui/badge'
@@ -136,6 +136,62 @@ function FolderDetailItem({ f, t }: { f: FolderProgress, t: (key: string) => str
  )
 }

+function GapFillRunDetail({ run, t }: { run: GapFillRun, t: (key: string) => string }) {
+  const folderEntries = Object.entries(run.folders)
+  if (folderEntries.length === 0) {
+    return (
+      <div className="text-center py-8 text-muted-foreground italic text-xs">
+        {t('accounts.runningState.empty.no_gap_fill_folders')}
+      </div>
+    )
+  }
+  const isActive = run.status === GapFillStatus.Running
+  return (
+    <div className="space-y-3">
+      {folderEntries.map(([name, stats]) => {
+        const pct = stats.candidate_count > 0
+          ? Math.min(100, Math.round((stats.downloaded / stats.candidate_count) * 100))
+          : 0
+        return (
+          <div key={name} className="py-1.5 border-b border-border/50 last:border-b-0">
+            <div className="flex items-center justify-between gap-2">
+              <span className="text-xs font-bold text-foreground truncate">{name}</span>
+              <span className="text-[10px] font-bold text-muted-foreground whitespace-nowrap">
+                {isActive && stats.candidate_count > 0 ? (
+                  <span className="text-blue-600">
+                    {stats.downloaded} <span className="opacity-50">/</span> {stats.candidate_count}
+                  </span>
+                ) : (
+                  <>
+                    <span className="text-blue-600">{stats.downloaded} {t('accounts.runningState.gap_fill_downloaded_suffix')}</span>
+                    {stats.failed > 0 && (
+                      <>
+                        <span className="mx-1 opacity-30">·</span>
+                        <span className="text-destructive">{stats.failed} {t('accounts.runningState.gap_fill_failed_suffix')}</span>
+                      </>
+                    )}
+                  </>
+                )}
+              </span>
+            </div>
+            {isActive && stats.candidate_count > 0 && (
+              <div className="mt-1.5 h-1.5 w-full rounded-full bg-muted overflow-hidden">
+                <div className="h-full rounded-full bg-blue-500 transition-all duration-500" style={{ width: `${pct}%` }} />
+              </div>
+            )}
+            {stats.message && (
+              <div className="mt-1.5 flex items-start gap-1.5">
+                <AlertTriangle className="w-3 h-3 text-amber-600 mt-0.5 shrink-0" />
+                <p className="text-[10px] font-medium text-amber-700 leading-relaxed">{stats.message}</p>
+              </div>
+            )}
+          </div>
+        )
+      })}
+    </div>
+  )
+}
+
 export function RunningStateDialog({ currentRow, open, onOpenChange }: Props) {
  const { t } = useTranslation();

@@ -149,6 +205,16 @@ export function RunningStateDialog({ currentRow, open, onOpenChange }: Props) {
    enabled: open && !!currentRow.id,
  })

+  const { data: gapFillData } = useQuery({
+    queryKey: ['gap-fill-state', currentRow.id],
+    queryFn: () => gap_fill_state(currentRow.id),
+    refetchInterval: (query) => {
+      const a = query.state.data?.active
+      return a && a.status === GapFillStatus.Running ? 5000 : false
+    },
+    enabled: open && !!currentRow.id,
+  })
+
  const session = state?.active_session
  const history = state?.history || []
  const isRunning = !!session && session.status === DownloadStatus.Running
@@ -199,6 +265,10 @@ export function RunningStateDialog({ currentRow, open, onOpenChange }: Props) {
                {t('accounts.runningState.tabs.history')}
                <Badge variant="secondary" className="ml-2 h-4 px-1 text-[10px] font-bold">{history.length}</Badge>
              </TabsTrigger>
+              <TabsTrigger value="gapfill" className="whitespace-nowrap data-[state=active]:border-b-2 data-[state=active]:border-primary rounded-none h-full bg-transparent shadow-none px-0 text-xs sm:text-sm font-bold">
+                {t('accounts.runningState.tabs.gap_fill')}
+                {gapFillData?.active && <Badge variant="secondary" className="ml-2 h-4 px-1 text-[10px] font-bold animate-pulse">{t('accounts.runningState.syncing')}</Badge>}
+              </TabsTrigger>
            </TabsList>
          </div>

@@ -439,6 +509,55 @@ export function RunningStateDialog({ currentRow, open, onOpenChange }: Props) {
                    </div>
                  </ScrollArea>
                </TabsContent>
+                <TabsContent value="gapfill" className="h-full m-0 data-[state=active]:flex flex-col">
+                  <ScrollArea className="flex-1">
+                    <div className="p-4 sm:p-6 space-y-4">
+                      {gapFillData?.active && (
+                        <div className="rounded-xl border bg-card shadow-sm p-4">
+                          <div className="flex items-center justify-between mb-3">
+                            <p className="text-[10px] font-bold text-muted-foreground uppercase">{t('accounts.runningState.gap_fill_active')}</p>
+                            <StatusBadge status={gapFillData.active.status} />
+                          </div>
+                          <GapFillRunDetail run={gapFillData.active} t={t} />
+                        </div>
+                      )}
+                      {(!gapFillData?.history || gapFillData.history.length === 0) ? (
+                        <div className="text-center py-20 text-muted-foreground italic text-sm">
+                          {t('accounts.runningState.empty.no_gap_fill_history')}
+                        </div>
+                      ) : (
+                        <Accordion type="single" collapsible className="space-y-3">
+                          {[...gapFillData.history].reverse().map((run, i) => (
+                            <AccordionItem key={i} value={`gapfill-${i}`} className="border rounded-xl bg-card shadow-sm px-4 border-border overflow-hidden">
+                              <AccordionTrigger className="hover:no-underline py-4">
+                                <div className="flex flex-col sm:flex-row sm:items-center justify-between w-full pr-4 gap-2">
+                                  <div className="flex items-center gap-3">
+                                    <div className="text-xs sm:text-xs font-bold font-mono text-foreground">
+                                      {format(new Date(run.started_at), 'yyyy-MM-dd HH:mm:ss')}
+                                    </div>
+                                    <StatusBadge status={run.status} />
+                                  </div>
+                                  <span className="text-[10px] font-bold text-muted-foreground bg-muted px-2 py-0.5 rounded-full self-start sm:self-auto">
+                                    <span className="text-blue-600">{run.downloaded} {t('accounts.runningState.gap_fill_downloaded_suffix')}</span>
+                                    {run.failed > 0 && (
+                                      <>
+                                        <span className="mx-1 opacity-30">·</span>
+                                        <span className="text-destructive">{run.failed} {t('accounts.runningState.gap_fill_failed_suffix')}</span>
+                                      </>
+                                    )}
+                                  </span>
+                                </div>
+                              </AccordionTrigger>
+                              <AccordionContent className="pb-4 border-t pt-4 mt-1 border-border">
+                                <GapFillRunDetail run={run} t={t} />
+                              </AccordionContent>
+                            </AccordionItem>
+                          ))}
+                        </Accordion>
+                      )}
+                    </div>
+                  </ScrollArea>
+                </TabsContent>
              </>
            )}
          </div>
--- a/web/src/features/accounts/components/start-download-dialog.tsx
+++ b/web/src/features/accounts/components/start-download-dialog.tsx
@@ -0,0 +1,88 @@
+//
+// 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/>.
+
+
+import { useEffect, useState } from 'react'
+import { Dialog, DialogContent, DialogDescription, DialogFooter, DialogHeader, DialogTitle } from '@/components/ui/dialog'
+import { Button } from '@/components/ui/button'
+import { Checkbox } from '@/components/ui/checkbox'
+import { Label } from '@/components/ui/label'
+import { useTranslation } from 'react-i18next'
+import { toast } from '@/hooks/use-toast'
+import { start_account_download, AccountModel } from '@/api/account/api'
+
+interface Props {
+  row: AccountModel
+  open: boolean
+  onOpenChange: (open: boolean) => void
+}
+
+export function StartDownloadDialog({ row, open, onOpenChange }: Props) {
+  const { t } = useTranslation()
+  const [runGapFill, setRunGapFill] = useState(false)
+  const [submitting, setSubmitting] = useState(false)
+
+  useEffect(() => {
+    if (open) {
+      setRunGapFill(false)
+      setSubmitting(false)
+    }
+  }, [open])
+
+  const handleConfirm = async () => {
+    setSubmitting(true)
+    try {
+      await start_account_download(row.id, runGapFill)
+      toast({ title: t('accounts.downloadStarted') })
+      onOpenChange(false)
+    } catch (error: any) {
+      toast({
+        variant: 'destructive',
+        title: t('accounts.downloadFailed'),
+        description: error.response?.data?.message || error.message,
+      })
+    } finally {
+      setSubmitting(false)
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={onOpenChange}>
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>{t('accounts.startDownload')}</DialogTitle>
+          <DialogDescription>
+            {t('accounts.startDownloadConfirmDesc')}
+          </DialogDescription>
+        </DialogHeader>
+        <div className="flex items-center gap-2 py-2">
+          <Checkbox id="run-gap-fill" checked={runGapFill} onCheckedChange={(v) => setRunGapFill(!!v)} />
+          <Label htmlFor="run-gap-fill">{t('accounts.runGapFill')}</Label>
+        </div>
+        <DialogFooter>
+          <Button variant="outline" onClick={() => onOpenChange(false)} disabled={submitting}>
+            {t('common.cancel')}
+          </Button>
+          <Button onClick={handleConfirm} disabled={submitting}>
+            {t('accounts.startDownload')}
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
--- a/web/src/locales/ar.json
+++ b/web/src/locales/ar.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "مثال: 993",
    "imapProxy": "استخدم وكيل SOCKS5 لاتصالات IMAP.",
    "incDownload": "الفاصل",
+    "incSync": "فترة التزامن",
    "lastSync": "آخر مزامنة",
    "leaveEmptyToKeepExisting": "اترك فارغًا للاحتفاظ بكلمة المرور الحالية، أو أدخل كلمة مرور جديدة لتحديثها.",
    "leaveEmptyToKeepPassword": "اترك فارغًا للاحتفاظ بكلمة المرور الحالية",
@@ -271,6 +272,7 @@
    "refreshToken": "رمز التحديث",
    "refreshTokenCopiedToClipboard": "تم نسخ رمز التحديث إلى الحافظة",
    "relative": "نسبي",
+    "runGapFill": "فحص البريد الجديد وتنزيله، مع ملء الرسائل القديمة المفقودة محلياً تلقائياً",
    "runningState": {
      "account": {
        "id": "معرّف الحساب"
@@ -283,10 +285,15 @@
        "no_active_download": "لا يوجد تنزيل نشط",
        "no_errors_current": "لا توجد أخطاء في الجلسة الحالية",
        "no_errors_session": "لا توجد أخطاء في هذه الجلسة",
+        "no_gap_fill_folders": "لا توجد مجلدات لمزامنة الرسائل المفقودة",
+        "no_gap_fill_history": "لا يوجد سجل لاستكمال الرسائل",
        "no_global_errors": "لا توجد أخطاء عامة",
        "no_history": "لا يوجد سجل"
      },
      "folders": "صناديق البريد",
+      "gap_fill_active": "عملية الاستكمال قيد التشغيل",
+      "gap_fill_downloaded_suffix": "تم تنزيلها",
+      "gap_fill_failed_suffix": "فشلت",
      "latest": "الأحدث",
      "loading": {
        "fetching_account_state": "جارٍ تحميل حالة الحساب..."
@@ -305,6 +312,7 @@
        "active_session": "الجلسة النشطة",
        "errors": "أخطاء",
        "folders": "صناديق البريد",
+        "gap_fill": "استكمال الرسائل الناقصة",
        "history": "السجل"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "تنزيل رسائل الفترة الأخيرة فقط (مثل آخر 3 أشهر). يتحرك تاريخ البدء تلقائياً مع مرور الوقت.",
    "sinceRelativeValue": "تنزيل رسائل البريد الإلكتروني من آخر",
    "startDownload": "بدء التنزيل",
+    "startDownloadConfirmDesc": "بدء تنزيل بيانات الحسابات المحددة؟",
    "state": "الحالة",
    "status": "الحالة",
    "step": "الخطوة {{index}}",
--- a/web/src/locales/da.json
+++ b/web/src/locales/da.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "f.eks. 993",
    "imapProxy": "Brug en SOCKS5-proxy til IMAP-forbindelser.",
    "incDownload": "Interval",
+    "incSync": "Synk-interval",
    "lastSync": "Sidste synk.",
    "leaveEmptyToKeepExisting": "Lad stå tomt for at beholde den eksisterende adgangskode, eller indtast en ny for at opdatere den.",
    "leaveEmptyToKeepPassword": "Lad stå tomt for at beholde nuværende adgangskode",
@@ -271,6 +272,7 @@
    "refreshToken": "Opdateringstoken",
    "refreshTokenCopiedToClipboard": "Opdateringstoken kopieret til udklipsholderen",
    "relative": "Relativ",
+    "runGapFill": "Tjek for nye e-mails og fyld automatisk op på ældre manglende e-mails",
    "runningState": {
      "account": {
        "id": "Konto-ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Ingen aktiv download",
        "no_errors_current": "Ingen fejl i nuværende session",
        "no_errors_session": "Ingen fejl i denne session",
+        "no_gap_fill_folders": "Ingen mapper med manglende e-mails",
+        "no_gap_fill_history": "Ingen historik over backfill",
        "no_global_errors": "Ingen globale fejl",
        "no_history": "Ingen historik"
      },
      "folders": "postkasser",
+      "gap_fill_active": "Kørende backfill-kørsel",
+      "gap_fill_downloaded_suffix": "downloadet",
+      "gap_fill_failed_suffix": "misllykkedes",
      "latest": "SENESTE",
      "loading": {
        "fetching_account_state": "Henter kontostatus..."
@@ -305,6 +312,7 @@
        "active_session": "Aktiv session",
        "errors": "Fejl",
        "folders": "Postkasser",
+        "gap_fill": "Udfyld manglende e-mails",
        "history": "Historik"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Download kun e-mails fra den seneste periode (f.eks. de seneste 3 måneder). Startdatoen flyttes automatisk fremad.",
    "sinceRelativeValue": "Download e-mails fra de sidste",
    "startDownload": "Start download",
+    "startDownloadConfirmDesc": "Start download for valgte konti?",
    "state": "Tilstand",
    "status": "Status",
    "step": "Trin {{index}}",
--- a/web/src/locales/de.json
+++ b/web/src/locales/de.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "z.B. 993",
    "imapProxy": "SOCKS5-Proxy für IMAP-Verbindungen verwenden.",
    "incDownload": "Intervall",
+    "incSync": "Synch.-Intervall",
    "lastSync": "Letzte Synchronisierung",
    "leaveEmptyToKeepExisting": "Leer lassen, um das bestehende Passwort beizubehalten, oder einen neuen Wert eingeben, um es zu aktualisieren.",
    "leaveEmptyToKeepPassword": "Leer lassen, um das aktuelle Passwort beizubehalten",
@@ -271,6 +272,7 @@
    "refreshToken": "Aktualisierungstoken",
    "refreshTokenCopiedToClipboard": "Aktualisierungstoken in die Zwischenablage kopiert",
    "relative": "Relativ",
+    "runGapFill": "Neue Mails prüfen und ältere, lokal fehlende Mails automatisch nachladen",
    "runningState": {
      "account": {
        "id": "Konto-ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Kein aktiver Download",
        "no_errors_current": "Keine Fehler in der aktuellen Sitzung",
        "no_errors_session": "Keine Fehler in dieser Sitzung",
+        "no_gap_fill_folders": "Keine Ordner für den Abgleich fehlender Mails",
+        "no_gap_fill_history": "Kein Backfill-Verlauf vorhanden",
        "no_global_errors": "Keine globalen Fehler",
        "no_history": "Kein Verlauf vorhanden"
      },
      "folders": "Postfächer",
+      "gap_fill_active": "Laufender Backfill-Prozess",
+      "gap_fill_downloaded_suffix": "heruntergeladen",
+      "gap_fill_failed_suffix": "fehlgeschlagen",
      "latest": "NEU",
      "loading": {
        "fetching_account_state": "Kontostatus wird geladen..."
@@ -305,6 +312,7 @@
        "active_session": "Aktive Sitzung",
        "errors": "Fehler",
        "folders": "Postfächer",
+        "gap_fill": "Lückenfüllung",
        "history": "Verlauf"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Nur E-Mails aus dem jüngsten Zeitraum herunterladen (z. B. letzte 3 Monate). Das Startdatum verschiebt sich automatisch.",
    "sinceRelativeValue": "E-Mails der letzten Zeit herunterladen",
    "startDownload": "Download starten",
+    "startDownloadConfirmDesc": "E-Mail-Download für gewählte Konten starten?",
    "state": "Zustand",
    "status": "Status",
    "step": "Schritt {{index}}",
--- a/web/src/locales/en.json
+++ b/web/src/locales/en.json
@@ -242,6 +242,7 @@
    "imapPortPlaceholder": "e.g 993",
    "imapProxy": "Use a proxy (http/socks5) for IMAP connections.",
    "incDownload": "Interval",
+    "incSync": "Sync interval",
    "lastSync": "Last Sync",
    "leaveEmptyToKeepExisting": "Leave empty to keep the existing password, or enter a new password to update it.",
    "leaveEmptyToKeepPassword": "Leave empty to keep current password",
@@ -273,6 +274,7 @@
    "refreshToken": "Refresh Token",
    "refreshTokenCopiedToClipboard": "Refresh token copied to clipboard",
    "relative": "Relative",
+    "runGapFill": "Check new emails and automatically backfill older missing emails",
    "runningState": {
      "account": {
        "id": "Account ID"
@@ -285,10 +287,15 @@
        "no_active_download": "No download in progress",
        "no_errors_current": "No errors in current session",
        "no_errors_session": "No errors in this session",
+        "no_gap_fill_folders": "No folders syncing missing messages",
+        "no_gap_fill_history": "No backfill history",
        "no_global_errors": "No global errors",
        "no_history": "No historical records found"
      },
      "folders": "mailboxes",
+      "gap_fill_active": "Running backfill task",
+      "gap_fill_downloaded_suffix": "downloaded",
+      "gap_fill_failed_suffix": "failed",
      "latest": "LATEST",
      "loading": {
        "fetching_account_state": "Fetching account state..."
@@ -307,6 +314,7 @@
        "active_session": "Active Session",
        "errors": "Errors",
        "folders": "Mailboxes",
+        "gap_fill": "Backfill missing emails",
        "history": "History"
      }
    },
@@ -355,6 +363,7 @@
    "sinceRelativeDesc": "Only download emails from the recent period (e.g. last 3 months). The start date automatically moves forward over time.",
    "sinceRelativeValue": "Download emails from the last",
    "startDownload": "Start download",
+    "startDownloadConfirmDesc": "Start downloading mail data for selected accounts?",
    "state": "State",
    "status": "Status",
    "step": "Step {{index}}",
--- a/web/src/locales/es.json
+++ b/web/src/locales/es.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "ej. 993",
    "imapProxy": "Usar proxy SOCKS5 para conexiones IMAP.",
    "incDownload": "Intervalo",
+    "incSync": "Intervalo de sinc.",
    "lastSync": "Última sincronización",
    "leaveEmptyToKeepExisting": "Deja vacío para mantener la contraseña existente, o introduce un nuevo valor para actualizarla.",
    "leaveEmptyToKeepPassword": "Deja vacío para mantener la contraseña actual",
@@ -271,6 +272,7 @@
    "refreshToken": "Token de actualización",
    "refreshTokenCopiedToClipboard": "Token de actualización copiado al portapapeles",
    "relative": "Relativa",
+    "runGapFill": "Verificar correos nuevos y rellenar automáticamente los faltantes antiguos",
    "runningState": {
      "account": {
        "id": "ID de cuenta"
@@ -283,10 +285,15 @@
        "no_active_download": "No hay descargas en curso",
        "no_errors_current": "Sin errores en la sesión actual",
        "no_errors_session": "Sin errores en esta sesión",
+        "no_gap_fill_folders": "No hay carpetas sincronizando mensajes faltantes",
+        "no_gap_fill_history": "Sin historial de backfill",
        "no_global_errors": "Sin errores globales",
        "no_history": "Sin historial"
      },
      "folders": "buzones",
+      "gap_fill_active": "Tarea de backfill en ejecución",
+      "gap_fill_downloaded_suffix": "descargados",
+      "gap_fill_failed_suffix": "fallidos",
      "latest": "RECIENTE",
      "loading": {
        "fetching_account_state": "Obteniendo estado de la cuenta..."
@@ -305,6 +312,7 @@
        "active_session": "Sesión activa",
        "errors": "Errores",
        "folders": "Buzones",
+        "gap_fill": "Completar mensajes faltantes",
        "history": "Historial"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Solo descargar correos del período reciente (ej. últimos 3 meses). La fecha de inicio avanza automáticamente.",
    "sinceRelativeValue": "Descargar correos de los últimos",
    "startDownload": "Iniciar descarga",
+    "startDownloadConfirmDesc": "¿Iniciar descarga para las cuentas seleccionadas?",
    "state": "Estado",
    "status": "Estado",
    "step": "Paso {{index}}",
--- a/web/src/locales/fi.json
+++ b/web/src/locales/fi.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "esim. 993",
    "imapProxy": "Käytä SOCKS5-välityspalvelinta IMAP-yhteyksiin.",
    "incDownload": "Väli",
+    "incSync": "Synkronointiväli",
    "lastSync": "Viimeisin synkronointi",
    "leaveEmptyToKeepExisting": "Jätä tyhjäksi säilyttääksesi olemassa olevan salasanan, tai syötä uusi päivittääksesi sen.",
    "leaveEmptyToKeepPassword": "Jätä tyhjäksi säilyttääksesi nykyisen salasanan",
@@ -271,6 +272,7 @@
    "refreshToken": "Virheettömyystunnus",
    "refreshTokenCopiedToClipboard": "Virheettömyystunnus kopioitu leikepöydälle",
    "relative": "Suhteellinen",
+    "runGapFill": "Tarkista uudet sähköpostit ja täydennä vanhat puuttuvat viestit automaattisesti",
    "runningState": {
      "account": {
        "id": "Tilin ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Ei aktiivista latausta",
        "no_errors_current": "Ei virheitä nykyisessä istunnossa",
        "no_errors_session": "Ei virheitä tässä istunnossa",
+        "no_gap_fill_folders": "Ei kansioita puuttuvien viestien täydennykseen",
+        "no_gap_fill_history": "Ei täydennyshistoriaa",
        "no_global_errors": "Ei yleisiä virheitä",
        "no_history": "Ei historiaa"
      },
      "folders": "postilaatikot",
+      "gap_fill_active": "Käynnissä oleva täydennys",
+      "gap_fill_downloaded_suffix": "ladattu",
+      "gap_fill_failed_suffix": "epäonnistui",
      "latest": "UUSIN",
      "loading": {
        "fetching_account_state": "Haetaan tilan tietoja..."
@@ -305,6 +312,7 @@
        "active_session": "Aktiivinen istunto",
        "errors": "Virheet",
        "folders": "Postilaatikot",
+        "gap_fill": "Puuttuvien täydennys",
        "history": "Historia"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Lataa vain viimeaikaiset sähköpostit (esim. viimeiset 3 kuukautta). Aloituspäivämäärä siirtyy automaattisesti eteenpäin.",
    "sinceRelativeValue": "Lataa sähköpostit viimeisimmiltä",
    "startDownload": "Aloita lataus",
+    "startDownloadConfirmDesc": "Aloitetaanko valittujen tilien lataus?",
    "state": "Tila",
    "status": "Tila",
    "step": "Vaihe {{index}}",
--- a/web/src/locales/fr.json
+++ b/web/src/locales/fr.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "ex. 993",
    "imapProxy": "Utiliser un proxy SOCKS5 pour les connexions IMAP.",
    "incDownload": "Intervalle",
+    "incSync": "Intervalle de synchro",
    "lastSync": "Dernière Synchronisation",
    "leaveEmptyToKeepExisting": "Laissez vide pour conserver le mot de passe existant, ou entrez-en un nouveau pour le mettre à jour.",
    "leaveEmptyToKeepPassword": "Laisser vide pour conserver le mot de passe actuel",
@@ -271,6 +272,7 @@
    "refreshToken": "Jeton de Rafraîchissement",
    "refreshTokenCopiedToClipboard": "Jeton de rafraîchissement copié dans le presse-papiers",
    "relative": "Relative",
+    "runGapFill": "Vérifier les nouveaux e-mails et rattraper automatiquement les anciens messages manquants",
    "runningState": {
      "account": {
        "id": "ID du compte"
@@ -283,10 +285,15 @@
        "no_active_download": "Aucun téléchargement en cours",
        "no_errors_current": "Aucune erreur dans la session actuelle",
        "no_errors_session": "Aucune erreur dans cette session",
+        "no_gap_fill_folders": "Aucun dossier en cours de synchronisation des messages manquants",
+        "no_gap_fill_history": "Aucun historique de rattrapage",
        "no_global_errors": "Aucune erreur globale",
        "no_history": "Aucun historique disponible"
      },
      "folders": "boîtes mail",
+      "gap_fill_active": "Tâche de rattrapage en cours",
+      "gap_fill_downloaded_suffix": "téléchargés",
+      "gap_fill_failed_suffix": "échec(s)",
      "latest": "RÉCENT",
      "loading": {
        "fetching_account_state": "Chargement de l'état du compte..."
@@ -305,6 +312,7 @@
        "active_session": "Session active",
        "errors": "Erreurs",
        "folders": "Boîtes mail",
+        "gap_fill": "Rattrapage des messages",
        "history": "Historique"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Télécharger uniquement les e-mails récents (ex. 3 derniers mois). La date de début avance automatiquement.",
    "sinceRelativeValue": "Télécharger les e-mails des derniers",
    "startDownload": "Lancer le téléchargement",
+    "startDownloadConfirmDesc": "Démarrer le téléchargement pour les comptes sélectionnés ?",
    "state": "État",
    "status": "Statut",
    "step": "Étape {{index}}",
--- a/web/src/locales/it.json
+++ b/web/src/locales/it.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "es. 993",
    "imapProxy": "Usa un proxy SOCKS5 per le connessioni IMAP.",
    "incDownload": "Intervallo",
+    "incSync": "Intervallo sinc.",
    "lastSync": "Ultima Sincronizzazione",
    "leaveEmptyToKeepExisting": "Lascia vuoto per mantenere la password esistente, o inseriscine una nuova per aggiornarla.",
    "leaveEmptyToKeepPassword": "Lascia vuoto per mantenere la password attuale",
@@ -271,6 +272,7 @@
    "refreshToken": "Token di Refresh",
    "refreshTokenCopiedToClipboard": "Token di refresh copiato negli appunti",
    "relative": "Relativa",
+    "runGapFill": "Controlla le nuove email e recupera automaticamente i vecchi messaggi mancanti",
    "runningState": {
      "account": {
        "id": "ID account"
@@ -283,10 +285,15 @@
        "no_active_download": "Nessun download in corso",
        "no_errors_current": "Nessun errore nella sessione corrente",
        "no_errors_session": "Nessun errore in questa sessione",
+        "no_gap_fill_folders": "Nessuna cartella con messaggi mancanti da scaricare",
+        "no_gap_fill_history": "Nessuna cronologia di backfill",
        "no_global_errors": "Nessun errore globale",
        "no_history": "Nessuna cronologia disponibile"
      },
      "folders": "caselle di posta",
+      "gap_fill_active": "Attività di backfill in esecuzione",
+      "gap_fill_downloaded_suffix": "scaricati",
+      "gap_fill_failed_suffix": "non riusciti",
      "latest": "RECENTE",
      "loading": {
        "fetching_account_state": "Caricamento stato account..."
@@ -305,6 +312,7 @@
        "active_session": "Sessione attiva",
        "errors": "Errori",
        "folders": "Caselle di posta",
+        "gap_fill": "Recupero messaggi mancanti",
        "history": "Cronologia"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Scarica solo le email del periodo recente (es. ultimi 3 mesi). La data di inizio si aggiorna automaticamente.",
    "sinceRelativeValue": "Scarica email degli ultimi",
    "startDownload": "Avvia download",
+    "startDownloadConfirmDesc": "Avviare il download per gli account selezionati?",
    "state": "Stato",
    "status": "Stato",
    "step": "Passo {{index}}",
--- a/web/src/locales/jp.json
+++ b/web/src/locales/jp.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "例: 993",
    "imapProxy": "IMAP接続にSOCKS5プロキシを使用します。",
    "incDownload": "間隔",
+    "incSync": "同期間隔",
    "lastSync": "最終同期",
    "leaveEmptyToKeepExisting": "既存のパスワードを保持する場合は空欄にしてください。更新する場合は新しいパスワードを入力してください。",
    "leaveEmptyToKeepPassword": "現在のパスワードを保持する場合は空欄にしてください",
@@ -271,6 +272,7 @@
    "refreshToken": "リフレッシュトークン",
    "refreshTokenCopiedToClipboard": "リフレッシュトークンをクリップボードにコピーしました",
    "relative": "相対",
+    "runGapFill": "新着メールを確認してダウンロードし、過去の未取得メールも自動的に差分補填します",
    "runningState": {
      "account": {
        "id": "アカウントID"
@@ -283,10 +285,15 @@
        "no_active_download": "現在ダウンロード中のタスクはありません",
        "no_errors_current": "現在のタスクにエラーはありません",
        "no_errors_session": "このタスクにエラーはありません",
+        "no_gap_fill_folders": "未取得メールを同期中のフォルダーはありません",
+        "no_gap_fill_history": "差分補填の履歴はありません",
        "no_global_errors": "全体エラーはありません",
        "no_history": "履歴がありません"
      },
      "folders": "メールボックス",
+      "gap_fill_active": "実行中の差分補填タスク",
+      "gap_fill_downloaded_suffix": "件ダウンロード済み",
+      "gap_fill_failed_suffix": "件失敗",
      "latest": "最新",
      "loading": {
        "fetching_account_state": "アカウント状態を取得中..."
@@ -305,6 +312,7 @@
        "active_session": "実行中タスク",
        "errors": "エラー",
        "folders": "メールボックス",
+        "gap_fill": "差分メール補填",
        "history": "履歴"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "直近の期間（例：過去3ヶ月）のメールのみをダウンロードします。開始日は時間経過に伴い自動的に更新されます。",
    "sinceRelativeValue": "直近の期間のメールをダウンロード",
    "startDownload": "ダウンロードを開始",
+    "startDownloadConfirmDesc": "選択したアカウントのメールデータをダウンロードしますか？",
    "state": "状態",
    "status": "ステータス",
    "step": "ステップ {{index}}",
--- a/web/src/locales/ko.json
+++ b/web/src/locales/ko.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "예: 993",
    "imapProxy": "IMAP 연결에 SOCKS5 프록시를 사용합니다.",
    "incDownload": "간격",
+    "incSync": "동기화 간격",
    "lastSync": "최종 동기화",
    "leaveEmptyToKeepExisting": "기존 비밀번호를 유지하려면 비워 두십시오. 업데이트할 경우에만 새 비밀번호를 입력하십시오.",
    "leaveEmptyToKeepPassword": "현재 비밀번호를 유지하려면 비워 두십시오",
@@ -271,6 +272,7 @@
    "refreshToken": "새로 고침 토큰",
    "refreshTokenCopiedToClipboard": "새로 고침 토큰이 클립보드에 복사되었습니다",
    "relative": "상대적",
+    "runGapFill": "새 메일을 확인하여 다운로드하고, 누락된 과거 메일도 자동으로 백필합니다",
    "runningState": {
      "account": {
        "id": "계정 ID"
@@ -283,10 +285,15 @@
        "no_active_download": "진행 중인 다운로드가 없습니다",
        "no_errors_current": "현재 작업에 오류가 없습니다",
        "no_errors_session": "이 작업에 오류가 없습니다",
+        "no_gap_fill_folders": "누락된 메일을 동기화 중인 메일함이 없습니다",
+        "no_gap_fill_history": "백필 기록 없음",
        "no_global_errors": "전체 오류가 없습니다",
        "no_history": "기록이 없습니다"
      },
      "folders": "메일함",
+      "gap_fill_active": "실행 중인 백필 작업",
+      "gap_fill_downloaded_suffix": "개 다운로드됨",
+      "gap_fill_failed_suffix": "개 실패",
      "latest": "최신",
      "loading": {
        "fetching_account_state": "계정 상태를 불러오는 중..."
@@ -305,6 +312,7 @@
        "active_session": "현재 작업",
        "errors": "오류",
        "folders": "메일함",
+        "gap_fill": "누락 메일 백필",
        "history": "기록"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "최근 기간(예: 지난 3개월)의 이메일만 다운로드합니다. 시작 날짜는 시간이 지남에 따라 자동으로 이동합니다.",
    "sinceRelativeValue": "최근 기간의 이메일 다운로드",
    "startDownload": "다운로드 시작",
+    "startDownloadConfirmDesc": "선택한 계정의 메일 데이터를 다운로드할까요?",
    "state": "상태",
    "status": "상태",
    "step": "단계 {{index}}",
--- a/web/src/locales/nl.json
+++ b/web/src/locales/nl.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "bv. 993",
    "imapProxy": "Gebruik een SOCKS5-proxy voor IMAP-verbindingen.",
    "incDownload": "Interval",
+    "incSync": "Synch.-interval",
    "lastSync": "Laatste Sync",
    "leaveEmptyToKeepExisting": "Laat leeg om het bestaande wachtwoord te behouden, of voer een nieuw wachtwoord in om het bij te werken.",
    "leaveEmptyToKeepPassword": "Laat leeg om huidig wachtwoord te behouden",
@@ -271,6 +272,7 @@
    "refreshToken": "Vernieuwingstoken (Refresh Token)",
    "refreshTokenCopiedToClipboard": "Vernieuwingstoken naar klembord gekopieerd",
    "relative": "Relatief",
+    "runGapFill": "Controleer op nieuwe e-mails en vul oudere ontbrekende e-mails automatisch aan",
    "runningState": {
      "account": {
        "id": "Account-ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Geen actieve download",
        "no_errors_current": "Geen fouten in huidige sessie",
        "no_errors_session": "Geen fouten in deze sessie",
+        "no_gap_fill_folders": "Geen mappen die ontbrekende berichten synchroniseren",
+        "no_gap_fill_history": "Geen backfill-geschiedenis",
        "no_global_errors": "Geen globale fouten",
        "no_history": "Geen geschiedenis beschikbaar"
      },
      "folders": "mailboxen",
+      "gap_fill_active": "Lopende backfill-taak",
+      "gap_fill_downloaded_suffix": "Gedownload",
+      "gap_fill_failed_suffix": "mislukt",
      "latest": "RECENT",
      "loading": {
        "fetching_account_state": "Accountstatus ophalen..."
@@ -305,6 +312,7 @@
        "active_session": "Actieve sessie",
        "errors": "Fouten",
        "folders": "Mailboxen",
+        "gap_fill": "Ontbrekende berichten aanvullen",
        "history": "Geschiedenis"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Download alleen e-mails uit de afgelopen periode (bijv. laatste 3 maanden). De startdatum verschuift automatisch mee.",
    "sinceRelativeValue": "Download e-mails van de laatste",
    "startDownload": "Download starten",
+    "startDownloadConfirmDesc": "Download starten voor geselecteerde accounts?",
    "state": "Status",
    "status": "Status",
    "step": "Stap {{index}}",
--- a/web/src/locales/no.json
+++ b/web/src/locales/no.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "f.eks. 993",
    "imapProxy": "Bruk en SOCKS5-proxy for IMAP-tilkoblinger.",
    "incDownload": "Intervall",
+    "incSync": "Synk-intervall",
    "lastSync": "Siste synkronisering",
    "leaveEmptyToKeepExisting": "La stå tomt for å beholde det eksisterende passordet, eller skriv inn et nytt passord for å oppdatere det.",
    "leaveEmptyToKeepPassword": "La stå tomt for å beholde nåværende passord",
@@ -271,6 +272,7 @@
    "refreshToken": "Oppfriskningstoken",
    "refreshTokenCopiedToClipboard": "Oppfriskningstoken kopiert til utklippstavlen",
    "relative": "Relativ",
+    "runGapFill": "Sjekk etter nye e-poster og fyll automatisk inn eldre manglende e-poster",
    "runningState": {
      "account": {
        "id": "Konto-ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Ingen aktiv nedlasting",
        "no_errors_current": "Ingen feil i gjeldende økt",
        "no_errors_session": "Ingen feil i denne økten",
+        "no_gap_fill_folders": "Ingen mapper med manglende e-poster",
+        "no_gap_fill_history": "Ingen backfill-historikk",
        "no_global_errors": "Ingen globale feil",
        "no_history": "Ingen historikk"
      },
      "folders": "postbokser",
+      "gap_fill_active": "Kjørende backfill-oppgave",
+      "gap_fill_downloaded_suffix": "lastet ned",
+      "gap_fill_failed_suffix": "mislyktes",
      "latest": "NYEST",
      "loading": {
        "fetching_account_state": "Henter kontostatus..."
@@ -305,6 +312,7 @@
        "active_session": "Aktiv økt",
        "errors": "Feil",
        "folders": "Postbokser",
+        "gap_fill": "Fyll inn manglende e-poster",
        "history": "Historikk"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Last bare ned e-poster fra den siste perioden (f.eks. siste 3 måneder). Startdatoen flyttes automatisk fremover.",
    "sinceRelativeValue": "Last ned e-poster fra de siste",
    "startDownload": "Start nedlasting",
+    "startDownloadConfirmDesc": "Start nedlasting for valgte kontoer?",
    "state": "Tilstand",
    "status": "Status",
    "step": "Trinn {{index}}",
--- a/web/src/locales/pl.json
+++ b/web/src/locales/pl.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "np. 993 (szyfrowany TLS/SSL) lub 143 (bez szyfrowania)",
    "imapProxy": "Użyj proxy gniazda SOCKS5 dla połączeń IMAP.",
    "incDownload": "Interwał",
+    "incSync": "Interwał synch.",
    "lastSync": "OStatnia synchronizacja",
    "leaveEmptyToKeepExisting": "Pozostaw to pole puste, jeśli chcesz zachować dotychczasowe hasło lub wpisz nowe, aby zaktualizować.",
    "leaveEmptyToKeepPassword": "Pozostaw to pole puste, jeśli chcesz zachować dotychczasowe hasło",
@@ -271,6 +272,7 @@
    "refreshToken": "Odśwież token",
    "refreshTokenCopiedToClipboard": "Token odśwież skopiowany do schowka",
    "relative": "Wzglednie",
+    "runGapFill": "Sprawdzaj nowe e-maile i automatycznie uzupełniaj starsze, brakujące wiadomości",
    "runningState": {
      "account": {
        "id": "ID konta"
@@ -283,10 +285,15 @@
        "no_active_download": "Brak aktywnego pobierania",
        "no_errors_current": "Brak błędów w bieżącej sesji",
        "no_errors_session": "Brak błędów w tej sesji",
+        "no_gap_fill_folders": "Brak folderów z brakującymi wiadomościami do pobrania",
+        "no_gap_fill_history": "Brak historii uzupełniania",
        "no_global_errors": "Brak błędów globalnych",
        "no_history": "Brak historii"
      },
      "folders": "skrzynki",
+      "gap_fill_active": "Trwające uzupełnianie",
+      "gap_fill_downloaded_suffix": "pobrano",
+      "gap_fill_failed_suffix": "niepowodzenie",
      "latest": "NAJNOWSZE",
      "loading": {
        "fetching_account_state": "Pobieranie stanu konta..."
@@ -305,6 +312,7 @@
        "active_session": "Aktywna sesja",
        "errors": "Błędy",
        "folders": "Skrzynki",
+        "gap_fill": "Uzupełnianie braków",
        "history": "Historia"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Pobieraj tylko wiadomości z ostatniego okresu (np. ostatnie 3 miesiące). Data początkowa automatycznie przesuwa się w czasie.",
    "sinceRelativeValue": "Pobierz e-maile z ostatnich",
    "startDownload": "Uruchom pobieranie",
+    "startDownloadConfirmDesc": "Rozpocząć pobieranie dla wybranych kont?",
    "state": "Status",
    "status": "Status",
    "step": "Krok {{index}}",
--- a/web/src/locales/pt.json
+++ b/web/src/locales/pt.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "Ex: 993",
    "imapProxy": "Usar proxy SOCKS5 para conexão IMAP.",
    "incDownload": "Intervalo",
+    "incSync": "Intervalo de sinc.",
    "lastSync": "Última Sincronização",
    "leaveEmptyToKeepExisting": "Deixe vazio para manter a senha existente. Insira a nova senha apenas se estiver atualizando.",
    "leaveEmptyToKeepPassword": "Deixe vazio para manter a senha atual",
@@ -271,6 +272,7 @@
    "refreshToken": "Token de Atualização",
    "refreshTokenCopiedToClipboard": "Token de atualização copiado para a área de transferência",
    "relative": "Relativo",
+    "runGapFill": "Verifique novos e-mails e preencha automaticamente e-mails antigos ausentes",
    "runningState": {
      "account": {
        "id": "ID da conta"
@@ -283,10 +285,15 @@
        "no_active_download": "Nenhum download em andamento",
        "no_errors_current": "Sem erros na sessão atual",
        "no_errors_session": "Sem erros nesta sessão",
+        "no_gap_fill_folders": "Nenhuma pasta sincronizando mensagens ausentes",
+        "no_gap_fill_history": "Nenhum histórico de backfill",
        "no_global_errors": "Sem erros globais",
        "no_history": "Sem histórico"
      },
      "folders": "caixas de correio",
+      "gap_fill_active": "Tarefa de backfill em execução",
+      "gap_fill_downloaded_suffix": "baixados",
+      "gap_fill_failed_suffix": "falharam",
      "latest": "RECENTE",
      "loading": {
        "fetching_account_state": "Obtendo estado da conta..."
@@ -305,6 +312,7 @@
        "active_session": "Sessão ativa",
        "errors": "Erros",
        "folders": "Caixas de correio",
+        "gap_fill": "Preenchimento de lacunas",
        "history": "Histórico"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Baixar apenas e-mails do período recente (ex: últimos 3 meses). A data de início avança automaticamente com o tempo.",
    "sinceRelativeValue": "Baixar e-mails dos últimos",
    "startDownload": "Iniciar download",
+    "startDownloadConfirmDesc": "Iniciar download para as contas selecionadas?",
    "state": "Estado",
    "status": "Status",
    "step": "Passo {{index}}",
--- a/web/src/locales/ru.json
+++ b/web/src/locales/ru.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "например, 993",
    "imapProxy": "Использовать SOCKS5 прокси для соединений IMAP.",
    "incDownload": "Интервал",
+    "incSync": "Интервал синхр.",
    "lastSync": "Посл. синхр.",
    "leaveEmptyToKeepExisting": "Оставьте пустым, чтобы сохранить существующий пароль, или введите новый для обновления.",
    "leaveEmptyToKeepPassword": "Оставьте пустым, чтобы сохранить текущий пароль",
@@ -271,6 +272,7 @@
    "refreshToken": "Refresh Token",
    "refreshTokenCopiedToClipboard": "Refresh token скопирован в буфер обмена",
    "relative": "Относительная",
+    "runGapFill": "Проверять новые письма и автоматически восполнять старые недостающие сообщения",
    "runningState": {
      "account": {
        "id": "ID аккаунта"
@@ -283,10 +285,15 @@
        "no_active_download": "Нет активных загрузок",
        "no_errors_current": "Нет ошибок в текущей сессии",
        "no_errors_session": "Нет ошибок в этой сессии",
+        "no_gap_fill_folders": "Нет папок для загрузки недостающих писем",
+        "no_gap_fill_history": "История восполнения отсутствует",
        "no_global_errors": "Нет глобальных ошибок",
        "no_history": "Нет истории"
      },
      "folders": "почтовые ящики",
+      "gap_fill_active": "Выполняемый запуск восполнения",
+      "gap_fill_downloaded_suffix": "скачано",
+      "gap_fill_failed_suffix": "ошибок",
      "latest": "ПОСЛЕДНЕЕ",
      "loading": {
        "fetching_account_state": "Загрузка состояния аккаунта..."
@@ -305,6 +312,7 @@
        "active_session": "Активная сессия",
        "errors": "Ошибки",
        "folders": "Почтовые ящики",
+        "gap_fill": "Восполнение пропусков",
        "history": "История"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Скачивать письма только за последний период (напр., за 3 месяца). Дата начала автоматически сдвигается со временем.",
    "sinceRelativeValue": "Скачать письма за последние",
    "startDownload": "Запустить загрузку",
+    "startDownloadConfirmDesc": "Начать загрузку почты для выбранных аккаунтов?",
    "state": "Состояние",
    "status": "Статус",
    "step": "Шаг {{index}}",
--- a/web/src/locales/sv.json
+++ b/web/src/locales/sv.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "t.ex. 993",
    "imapProxy": "Använd en SOCKS5-proxy för IMAP-anslutningar.",
    "incDownload": "Intervall",
+    "incSync": "Synkintervall",
    "lastSync": "Senaste synk",
    "leaveEmptyToKeepExisting": "Lämna tomt för att behålla det befintliga lösenordet, eller ange ett nytt för att uppdatera det.",
    "leaveEmptyToKeepPassword": "Lämna tomt för att behålla nuvarande lösenord",
@@ -271,6 +272,7 @@
    "refreshToken": "Uppdateringstoken",
    "refreshTokenCopiedToClipboard": "Uppdateringstoken kopierad till urklipp",
    "relative": "Relativ",
+    "runGapFill": "Kontrollera nya e-postmeddelanden och komplettera automatiskt äldre saknade meddelanden",
    "runningState": {
      "account": {
        "id": "Kontots ID"
@@ -283,10 +285,15 @@
        "no_active_download": "Ingen aktiv nedladdning",
        "no_errors_current": "Inga fel i aktuell session",
        "no_errors_session": "Inga fel i denna session",
+        "no_gap_fill_folders": "Inga mappar för synkning av saknade meddelanden",
+        "no_gap_fill_history": "Ingen kompletteringshistorik",
        "no_global_errors": "Inga globala fel",
        "no_history": "Ingen historik"
      },
      "folders": "postlådor",
+      "gap_fill_active": "Pågående kompletteringskörning",
+      "gap_fill_downloaded_suffix": "nedladdade",
+      "gap_fill_failed_suffix": "misslyckades",
      "latest": "SENASTE",
      "loading": {
        "fetching_account_state": "Hämtar kontostatus..."
@@ -305,6 +312,7 @@
        "active_session": "Aktiv session",
        "errors": "Fel",
        "folders": "Postlådor",
+        "gap_fill": "Komplettera saknade meddelanden",
        "history": "Historik"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "Ladda endast ner e-postmeddelanden från den senaste perioden (t.ex. senaste 3 månaderna). Startdatumet flyttas automatiskt framåt.",
    "sinceRelativeValue": "Ladda ner e-post från de senaste",
    "startDownload": "Starta hämtning",
+    "startDownloadConfirmDesc": "Starta nedladdning för valda konton?",
    "state": "Tillstånd",
    "status": "Status",
    "step": "Steg {{index}}",
--- a/web/src/locales/zh-tw.json
+++ b/web/src/locales/zh-tw.json
@@ -240,6 +240,7 @@
    "imapPortPlaceholder": "例如：993",
    "imapProxy": "使用 SOCKS5 代理進行 IMAP 連線。",
    "incDownload": "間隔",
+    "incSync": "同步間隔",
    "lastSync": "上次同步",
    "leaveEmptyToKeepExisting": "保留現有密碼請留空。若要更新，請輸入新密碼。",
    "leaveEmptyToKeepPassword": "保留現有密碼請留空",
@@ -271,6 +272,7 @@
    "refreshToken": "更新權杖 (Refresh Token)",
    "refreshTokenCopiedToClipboard": "更新權杖已複製到剪貼簿",
    "relative": "相對",
+    "runGapFill": "檢查並下載新郵件，同時自動補全本地缺失的歷史舊郵件",
    "runningState": {
      "account": {
        "id": "帳戶 ID"
@@ -283,10 +285,15 @@
        "no_active_download": "目前沒有下載任務",
        "no_errors_current": "目前任務沒有錯誤",
        "no_errors_session": "此任務沒有錯誤",
+        "no_gap_fill_folders": "暫無需要補充缺失郵件的郵件資料夾",
+        "no_gap_fill_history": "暫無查漏補缺歷史記錄",
        "no_global_errors": "沒有全域錯誤",
        "no_history": "沒有歷史記錄"
      },
      "folders": "個郵件夾",
+      "gap_fill_active": "執行中的查漏補缺任務",
+      "gap_fill_downloaded_suffix": "已下載",
+      "gap_fill_failed_suffix": "失敗",
      "latest": "最新",
      "loading": {
        "fetching_account_state": "正在取得帳戶狀態..."
@@ -305,6 +312,7 @@
        "active_session": "目前任務",
        "errors": "錯誤",
        "folders": "郵件夾",
+        "gap_fill": "缺失郵件查漏補缺",
        "history": "歷史記錄"
      }
    },
@@ -345,6 +353,7 @@
    "sinceRelativeDesc": "僅下載最近一段時間（如過去 3 個月）的郵件。開始日期會隨時間推移自動向前滾動。",
    "sinceRelativeValue": "下載最近一段時期的郵件",
    "startDownload": "啟動下載",
+    "startDownloadConfirmDesc": "確定開始下載所選帳號的郵件資料？",
    "state": "狀態",
    "status": "狀態",
    "step": "步驟 {{index}}",
--- a/web/src/locales/zh.json
+++ b/web/src/locales/zh.json
@@ -242,6 +242,7 @@
    "imapPortPlaceholder": "例如:993",
    "imapProxy": "为 IMAP 连接使用 SOCKS5 代理。",
    "incDownload": "间隔",
+    "incSync": "同步间隔",
    "lastSync": "最后同步",
    "leaveEmptyToKeepExisting": "留空以保持现有密码，或输入新密码进行更新。",
    "leaveEmptyToKeepPassword": "留空以保持当前密码",
@@ -273,6 +274,7 @@
    "refreshToken": "刷新令牌",
    "refreshTokenCopiedToClipboard": "刷新令牌已复制到剪贴板",
    "relative": "相对",
+    "runGapFill": "检查并下载新邮件，同时自动补全本地缺失的历史老邮件",
    "runningState": {
      "account": {
        "id": "账户 ID"
@@ -285,10 +287,15 @@
        "no_active_download": "当前没有下载任务",
        "no_errors_current": "当前任务无错误",
        "no_errors_session": "该任务无错误",
+        "no_gap_fill_folders": "暂无需要补充缺失邮件的邮件夹",
+        "no_gap_fill_history": "暂无查漏补缺历史记录",
        "no_global_errors": "暂无全局错误",
        "no_history": "暂无历史记录"
      },
      "folders": "个文件夹",
+      "gap_fill_active": "运行中的查漏补缺任务",
+      "gap_fill_downloaded_suffix": "已下载",
+      "gap_fill_failed_suffix": "失败",
      "latest": "最新",
      "loading": {
        "fetching_account_state": "正在获取账户状态..."
@@ -307,6 +314,7 @@
        "active_session": "当前任务",
        "errors": "错误",
        "folders": "邮件夹",
+        "gap_fill": "缺失邮件查漏补缺",
        "history": "历史记录"
      }
    },
@@ -355,6 +363,7 @@
    "sinceRelativeDesc": "仅下载最近一段时间（如过去 3 个月）的邮件。开始日期会随时间推移自动向后滚动。",
    "sinceRelativeValue": "下载最近一段时期的邮件",
    "startDownload": "启动下载",
+    "startDownloadConfirmDesc": "确定开始下载所选账号的邮件数据？",
    "state": "状态",
    "status": "状态",
    "step": "步骤 {{index}}",