fix: resume interrupted downloads after container restart

Store subtitle/year/category in downloads table. On startup, re-queue
any download still in queued/downloading state (reset downloading → queued).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

downloader.py

@@ -95,6 +95,9 @@ class DownloadManager:
                     id       TEXT PRIMARY KEY,
                     url      TEXT NOT NULL,
                     title    TEXT NOT NULL,
+                    subtitle TEXT NOT NULL DEFAULT '',
+                    year     INTEGER,
+                    category TEXT NOT NULL DEFAULT '',
                     filename TEXT,
                     state    TEXT NOT NULL DEFAULT 'queued',
                     progress REAL DEFAULT 0,
@@ -105,6 +108,15 @@ class DownloadManager:
                     error    TEXT
                 )
             """)
+            for col, definition in [
+                ("subtitle", "TEXT NOT NULL DEFAULT ''"),
+                ("year",     "INTEGER"),
+                ("category", "TEXT NOT NULL DEFAULT ''"),
+            ]:
+                try:
+                    conn.execute(f"ALTER TABLE downloads ADD COLUMN {col} {definition}")
+                except Exception:
+                    pass
             conn.execute("""
                 CREATE TABLE IF NOT EXISTS auto_dl_categories (
                     category TEXT PRIMARY KEY,
@@ -152,14 +164,32 @@ class DownloadManager:
         now = datetime.now().isoformat()
         with _db() as conn:
             conn.execute(
-                "INSERT INTO downloads (id, url, title, state, started_at) VALUES (?,?,?,'queued',?)",
-                (dl_id, url, title, now),
+                "INSERT INTO downloads (id, url, title, subtitle, year, category, state, started_at) VALUES (?,?,?,?,?,?,'queued',?)",
+                (dl_id, url, title, subtitle, year, category, now),
             )
         with self._lock:
             self._active[dl_id] = {"state": "queued", "progress": 0, "title": title}
         await self._queue.put((dl_id, url, title, subtitle, year, category))
         return dl_id
 
+    async def resume_pending(self):
+        """Re-queue downloads interrupted by a container restart."""
+        with _db() as conn:
+            rows = conn.execute(
+                "SELECT id, url, title, subtitle, year, category FROM downloads"
+                " WHERE state IN ('queued', 'downloading') ORDER BY started_at"
+            ).fetchall()
+            conn.execute(
+                "UPDATE downloads SET state='queued', progress=0, speed='', eta=NULL"
+                " WHERE state='downloading'"
+            )
+        for r in rows:
+            with self._lock:
+                self._active[r["id"]] = {"state": "queued", "progress": 0, "title": r["title"]}
+            await self._queue.put((r["id"], r["url"], r["title"], r["subtitle"] or "", r["year"], r["category"] or ""))
+        if rows:
+            logger.info("Resumed %d pending download(s)", len(rows))
+
     async def start_worker(self):
         loop = asyncio.get_running_loop()
         while True: