Complete history archive support for dashboard/map data and mark task finished

Add source=archive option for dashboard endpoints and history service; update Docs/Tasks.md; include archive branch for list_bans, bans_by_country, ban_trend, bans_by_jail; tests for archive paths.

backend/app/tasks/history_sync.py

@@ -0,0 +1,109 @@
+"""History sync background task.
+
+Periodically copies new records from the fail2ban sqlite database into the
+BanGUI application archive table to prevent gaps when fail2ban purges old rows.
+"""
+
+from __future__ import annotations
+
+import datetime
+from typing import TYPE_CHECKING
+
+import structlog
+
+from app.repositories import fail2ban_db_repo
+from app.utils.fail2ban_db_utils import get_fail2ban_db_path
+
+if TYPE_CHECKING:  # pragma: no cover
+    from fastapi import FastAPI
+
+log: structlog.stdlib.BoundLogger = structlog.get_logger()
+
+#: Stable APScheduler job id.
+JOB_ID: str = "history_sync"
+
+#: Interval in seconds between sync runs.
+HISTORY_SYNC_INTERVAL: int = 300
+
+#: Backfill window when archive is empty (seconds).
+BACKFILL_WINDOW: int = 7 * 86400
+
+
+async def _get_last_archive_ts(db) -> int | None:
+    async with db.execute("SELECT MAX(timeofban) FROM history_archive") as cur:
+        row = await cur.fetchone()
+    if row is None or row[0] is None:
+        return None
+    return int(row[0])
+
+
+async def _run_sync(app: FastAPI) -> None:
+    db = app.state.db
+    socket_path: str = app.state.settings.fail2ban_socket
+
+    try:
+        last_ts = await _get_last_archive_ts(db)
+        now_ts = int(datetime.datetime.now(datetime.UTC).timestamp())
+
+        if last_ts is None:
+            last_ts = now_ts - BACKFILL_WINDOW
+            log.info("history_sync_backfill", window_seconds=BACKFILL_WINDOW)
+
+        per_page = 500
+        next_since = last_ts
+        total_synced = 0
+
+        while True:
+            fail2ban_db_path = await get_fail2ban_db_path(socket_path)
+            rows, total = await fail2ban_db_repo.get_history_page(
+                db_path=fail2ban_db_path,
+                since=next_since,
+                page=1,
+                page_size=per_page,
+            )
+
+            if not rows:
+                break
+
+            from app.repositories.history_archive_repo import archive_ban_event
+
+            for row in rows:
+                await archive_ban_event(
+                    db=db,
+                    jail=row.jail,
+                    ip=row.ip,
+                    timeofban=row.timeofban,
+                    bancount=row.bancount,
+                    data=row.data,
+                    action="ban",
+                )
+                total_synced += 1
+
+            # Continue where we left off by max timeofban + 1.
+            max_time = max(row.timeofban for row in rows)
+            next_since = max_time + 1
+
+            if len(rows) < per_page:
+                break
+
+        log.info("history_sync_complete", synced=total_synced)
+
+    except Exception:
+        log.exception("history_sync_failed")
+
+
+def register(app: FastAPI) -> None:
+    """Register the history sync periodic job.
+
+    Should be called after scheduler startup, from the lifespan handler.
+    """
+    app.state.scheduler.add_job(
+        _run_sync,
+        trigger="interval",
+        seconds=HISTORY_SYNC_INTERVAL,
+        kwargs={"app": app},
+        id=JOB_ID,
+        replace_existing=True,
+        next_run_time=datetime.datetime.now(tz=datetime.UTC),
+    )
+    log.info("history_sync_scheduled", interval_seconds=HISTORY_SYNC_INTERVAL)