Merge pull request #937 from alexta69/copilot/check-issue-692

Propagate missing playlist context fields (playlist_count, playlist_autonumber, etc.)

Dockerfile

@@ -26,9 +26,6 @@ RUN sed -i 's/\r$//g' docker-entrypoint.sh && \
       gosu \
       curl \
       tini \
-      file \
-      gdbmtool \
-      sqlite3 \
       build-essential && \
     curl -LsSf https://astral.sh/uv/install.sh | UV_INSTALL_DIR=/usr/local/bin sh && \
     UV_PROJECT_ENVIRONMENT=/usr/local uv sync --frozen --no-dev --compile-bytecode && \
@@ -66,9 +63,10 @@ ENV UMASK=022
 ENV DOWNLOAD_DIR=/downloads
 ENV STATE_DIR=/downloads/.metube
 ENV TEMP_DIR=/downloads
+ENV PORT=8081
 VOLUME /downloads
 EXPOSE 8081
-HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS "http://localhost:8081/" || exit 1
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS "http://localhost:${PORT}/" || exit 1
 
 # Add build-time argument for version
 ARG VERSION=dev

README.md

@@ -3,7 +3,12 @@
 ![Build Status](https://github.com/alexta69/metube/actions/workflows/main.yml/badge.svg)
 ![Docker Pulls](https://img.shields.io/docker/pulls/alexta69/metube.svg)
 
-Web GUI for youtube-dl (using the [yt-dlp](https://github.com/yt-dlp/yt-dlp) fork) with playlist support. Allows you to download videos from YouTube and [dozens of other sites](https://github.com/yt-dlp/yt-dlp/blob/master/supportedsites.md).
+MeTube is a self-hosted web UI for `yt-dlp`, for downloading media from YouTube and [dozens of other sites](https://github.com/yt-dlp/yt-dlp/blob/master/supportedsites.md).
+
+Key capabilities:
+* Download videos, audio, captions, and thumbnails from a browser UI.
+* Download playlists and channels, with configurable output and download options.
+* Subscribe to channels and playlists, periodically check for new items, and queue new uploads automatically.
 
 ![screenshot1](https://github.com/alexta69/metube/raw/master/screenshot.gif)
 
@@ -36,6 +41,9 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __MAX_CONCURRENT_DOWNLOADS__: Maximum number of simultaneous downloads allowed. For example, if set to `5`, then at most five downloads will run concurrently, and any additional downloads will wait until one of the active downloads completes. Defaults to `3`. 
 * __DELETE_FILE_ON_TRASHCAN__: if `true`, downloaded files are deleted on the server, when they are trashed from the "Completed" section of the UI. Defaults to `false`.
 * __DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT__: Maximum number of playlist items that can be downloaded. Defaults to `0` (no limit).
+* __SUBSCRIPTION_DEFAULT_CHECK_INTERVAL__: Default minutes between automatic checks for each subscription. Defaults to `60`.
+* __SUBSCRIPTION_SCAN_PLAYLIST_END__: Maximum playlist/channel entries to fetch per subscription check (newest-first). Defaults to `50`.
+* __SUBSCRIPTION_MAX_SEEN_IDS__: Cap on stored video IDs per subscription to limit state file growth. Defaults to `50000`.
 * __CLEAR_COMPLETED_AFTER__: Number of seconds after which completed (and failed) downloads are automatically removed from the "Completed" list. Defaults to `0` (disabled).
 
 ### 📁 Storage & Directories
@@ -46,7 +54,7 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __CREATE_CUSTOM_DIRS__: Whether to support automatically creating directories within the __DOWNLOAD_DIR__ (or __AUDIO_DOWNLOAD_DIR__) if they do not exist. When enabled, the download directory selector supports free-text input, and the specified directory will be created recursively. Defaults to `true`.
 * __CUSTOM_DIRS_EXCLUDE_REGEX__: Regular expression to exclude some custom directories from the dropdown. Empty regex disables exclusion. Defaults to `(^|/)[.@].*$`, which means directories starting with `.` or `@`.
 * __DOWNLOAD_DIRS_INDEXABLE__: If `true`, the download directories (__DOWNLOAD_DIR__ and __AUDIO_DOWNLOAD_DIR__) are indexable on the web server. Defaults to `false`.
-* __STATE_DIR__: Path to where the queue persistence files will be saved. Defaults to `/downloads/.metube` in the Docker image, and `.` otherwise.
+* __STATE_DIR__: Path to where MeTube will store its persistent state files (`queue.json`, `pending.json`, `completed.json`, `subscriptions.json`). Defaults to `/downloads/.metube` in the Docker image, and `.` otherwise.
 * __TEMP_DIR__: Path where intermediary download files will be saved. Defaults to `/downloads` in the Docker image, and `.` otherwise.
   * Set this to an SSD or RAM filesystem (e.g., `tmpfs`) for better performance.
   * __Note__: Using a RAM filesystem may prevent downloads from being resumed.

app/main.py

@@ -17,6 +17,7 @@ import re
 from watchfiles import DefaultFilter, Change, awatch
 
 from ytdl import DownloadQueueNotifier, DownloadQueue, Download
+from subscriptions import SubscriptionManager, SubscriptionNotifier, SubscriptionInfo
 from yt_dlp.version import __version__ as yt_dlp_version
 
 log = logging.getLogger('main')
@@ -50,6 +51,9 @@ class Config:
         'OUTPUT_TEMPLATE_PLAYLIST': '%(playlist_title)s/%(title)s.%(ext)s',
         'OUTPUT_TEMPLATE_CHANNEL': '%(channel)s/%(title)s.%(ext)s',
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT' : '0',
+        'SUBSCRIPTION_DEFAULT_CHECK_INTERVAL': '60',
+        'SUBSCRIPTION_SCAN_PLAYLIST_END': '50',
+        'SUBSCRIPTION_MAX_SEEN_IDS': '50000',
         'CLEAR_COMPLETED_AFTER': '0',
         'YTDL_OPTIONS': '{}',
         'YTDL_OPTIONS_FILE': '',
@@ -114,6 +118,7 @@ class Config:
         'PUBLIC_HOST_URL',
         'PUBLIC_HOST_AUDIO_URL',
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT',
+        'SUBSCRIPTION_DEFAULT_CHECK_INTERVAL',
     )
 
     def frontend_safe(self) -> dict:
@@ -272,6 +277,34 @@ dqueue = DownloadQueue(config, Notifier())
 app.on_startup.append(lambda app: dqueue.initialize())
 app.on_cleanup.append(lambda app: Download.shutdown_manager())
 
+
+class MetubeSubscriptionNotifier(SubscriptionNotifier):
+    async def subscription_added(self, sub: SubscriptionInfo):
+        log.info("Subscription added: %s", sub.name)
+        await sio.emit('subscription_added', serializer.encode(sub.to_public_dict()))
+
+    async def subscription_updated(self, sub: SubscriptionInfo):
+        await sio.emit('subscription_updated', serializer.encode(sub.to_public_dict()))
+
+    async def subscription_removed(self, sub_id: str):
+        log.info("Subscription removed: %s", sub_id)
+        await sio.emit('subscription_removed', serializer.encode(sub_id))
+
+    async def subscriptions_all(self, subs: list[SubscriptionInfo]):
+        await sio.emit('subscriptions_all', serializer.encode([s.to_public_dict() for s in subs]))
+
+
+submgr = SubscriptionManager(config, dqueue, MetubeSubscriptionNotifier())
+app.on_cleanup.append(lambda app: submgr.close())
+
+
+async def _subscription_loop_startup(app):
+    """aiohttp on_startup requires awaitable receivers; start_background_loop is sync."""
+    submgr.start_background_loop()
+
+
+app.on_startup.append(_subscription_loop_startup)
+
 class FileOpsFilter(DefaultFilter):
     def __call__(self, change_type: int, path: str) -> bool:
         # Check if this path matches our YTDL_OPTIONS_FILE
@@ -332,27 +365,17 @@ async def _read_json_request(request: web.Request) -> dict:
     return post
 
 
-@routes.post(config.URL_PREFIX + 'add')
-async def add(request):
-    log.info("Received request to add download")
-    post = await _read_json_request(request)
-    post = _migrate_legacy_request(post)
-    log.info(
-        "Add download request: type=%s quality=%s format=%s has_folder=%s auto_start=%s",
-        post.get('download_type'),
-        post.get('quality'),
-        post.get('format'),
-        bool(post.get('folder')),
-        post.get('auto_start'),
-    )
+def parse_download_options(post: dict) -> dict:
+    """Validate add/subscribe body; raise HTTPBadRequest on invalid input."""
+    post = _migrate_legacy_request(dict(post))
     url = post.get('url')
     download_type = post.get('download_type')
     codec = post.get('codec')
     format = post.get('format')
     quality = post.get('quality')
     if not url or not quality or not download_type:
-        log.error("Bad request: missing 'url', 'download_type', or 'quality'")
-        raise web.HTTPBadRequest()
+        raise web.HTTPBadRequest(reason="missing 'url', 'download_type', or 'quality'")
+    url = str(url).strip()
     folder = post.get('folder')
     custom_name_prefix = post.get('custom_name_prefix')
     playlist_item_limit = post.get('playlist_item_limit')
@@ -429,20 +452,54 @@ async def add(request):
     except (TypeError, ValueError) as exc:
         raise web.HTTPBadRequest(reason='playlist_item_limit must be an integer') from exc
 
+    return {
+        'url': url,
+        'download_type': download_type,
+        'codec': codec,
+        'format': format,
+        'quality': quality,
+        'folder': folder,
+        'custom_name_prefix': custom_name_prefix,
+        'playlist_item_limit': playlist_item_limit,
+        'auto_start': auto_start,
+        'split_by_chapters': split_by_chapters,
+        'chapter_template': chapter_template,
+        'subtitle_language': subtitle_language,
+        'subtitle_mode': subtitle_mode,
+    }
+
+
+@routes.post(config.URL_PREFIX + 'add')
+async def add(request):
+    log.info("Received request to add download")
+    post = await _read_json_request(request)
+    try:
+        o = parse_download_options(post)
+    except web.HTTPBadRequest as e:
+        log.error("Bad request: %s", e.reason)
+        raise
+    log.info(
+        "Add download request: type=%s quality=%s format=%s has_folder=%s auto_start=%s",
+        o['download_type'],
+        o['quality'],
+        o['format'],
+        bool(o.get('folder')),
+        o['auto_start'],
+    )
     status = await dqueue.add(
-        url,
-        download_type,
-        codec,
-        format,
-        quality,
-        folder,
-        custom_name_prefix,
-        playlist_item_limit,
-        auto_start,
-        split_by_chapters,
-        chapter_template,
-        subtitle_language,
-        subtitle_mode,
+        o['url'],
+        o['download_type'],
+        o['codec'],
+        o['format'],
+        o['quality'],
+        o['folder'],
+        o['custom_name_prefix'],
+        o['playlist_item_limit'],
+        o['auto_start'],
+        o['split_by_chapters'],
+        o['chapter_template'],
+        o['subtitle_language'],
+        o['subtitle_mode'],
     )
     return web.Response(text=serializer.encode(status))
 
@@ -451,6 +508,82 @@ async def cancel_add(request):
     dqueue.cancel_add()
     return web.Response(text=serializer.encode({'status': 'ok'}), content_type='application/json')
 
+
+@routes.post(config.URL_PREFIX + 'subscribe')
+async def subscribe(request):
+    post = await _read_json_request(request)
+    try:
+        o = parse_download_options(post)
+    except web.HTTPBadRequest:
+        raise
+    cic = post.get('check_interval_minutes')
+    if cic is None:
+        cic = config.SUBSCRIPTION_DEFAULT_CHECK_INTERVAL
+    try:
+        cic = int(cic)
+    except (TypeError, ValueError) as exc:
+        raise web.HTTPBadRequest(reason='check_interval_minutes must be an integer') from exc
+    if cic < 1:
+        raise web.HTTPBadRequest(reason='check_interval_minutes must be at least 1')
+
+    result = await submgr.add_subscription(
+        o['url'],
+        check_interval_minutes=cic,
+        download_type=o['download_type'],
+        codec=o['codec'],
+        format=o['format'],
+        quality=o['quality'],
+        folder=o['folder'] or '',
+        custom_name_prefix=o['custom_name_prefix'],
+        auto_start=o['auto_start'],
+        playlist_item_limit=o['playlist_item_limit'],
+        split_by_chapters=o['split_by_chapters'],
+        chapter_template=o['chapter_template'],
+        subtitle_language=o['subtitle_language'],
+        subtitle_mode=o['subtitle_mode'],
+    )
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.get(config.URL_PREFIX + 'subscriptions')
+async def subscriptions_list(request):
+    return web.Response(text=serializer.encode([s.to_public_dict() for s in submgr.list_all()]))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/update')
+async def subscriptions_update(request):
+    post = await _read_json_request(request)
+    sub_id = post.get('id')
+    if not sub_id:
+        raise web.HTTPBadRequest(reason='missing subscription id')
+    changes = {k: v for k, v in post.items() if k != 'id' and k in ('enabled', 'check_interval_minutes', 'name')}
+    if not changes:
+        raise web.HTTPBadRequest(reason='no valid fields to update')
+    log.info("Subscription update requested for %s: %s", sub_id, sorted(changes.keys()))
+    result = await submgr.update_subscription(str(sub_id), changes)
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/delete')
+async def subscriptions_delete(request):
+    post = await _read_json_request(request)
+    ids = post.get('ids')
+    if not ids or not isinstance(ids, list):
+        raise web.HTTPBadRequest(reason='missing ids list')
+    result = await submgr.delete_subscriptions([str(i) for i in ids])
+    return web.Response(text=serializer.encode(result))
+
+
+@routes.post(config.URL_PREFIX + 'subscriptions/check')
+async def subscriptions_check(request):
+    post = await _read_json_request(request)
+    ids = post.get('ids')
+    if ids is not None and not isinstance(ids, list):
+        raise web.HTTPBadRequest(reason='ids must be a list')
+    log.info("Subscription check-now requested for ids=%s", ids if ids else "all-enabled")
+    result = await submgr.check_now([str(i) for i in ids] if ids else None)
+    return web.Response(text=serializer.encode(result))
+
 @routes.post(config.URL_PREFIX + 'delete')
 async def delete(request):
     post = await _read_json_request(request)
@@ -554,6 +687,7 @@ async def history(request):
 async def connect(sid, environ):
     log.info(f"Client connected: {sid}")
     await sio.emit('all', serializer.encode(dqueue.get()), to=sid)
+    await sio.emit('subscriptions_all', serializer.encode([s.to_public_dict() for s in submgr.list_all()]), to=sid)
     await sio.emit('configuration', serializer.encode(config.frontend_safe()), to=sid)
     if config.CUSTOM_DIRS:
         await sio.emit('custom_dirs', serializer.encode(get_custom_dirs()), to=sid)
@@ -672,6 +806,11 @@ async def add_cors(request):
 
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'add', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'cancel-add', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscribe', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/update', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/delete', add_cors)
+app.router.add_route('OPTIONS', config.URL_PREFIX + 'subscriptions/check', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'upload-cookies', add_cors)
 app.router.add_route('OPTIONS', config.URL_PREFIX + 'delete-cookies', add_cors)
 

app/state_store.py

@@ -0,0 +1,156 @@
+from __future__ import annotations
+
+import base64
+import collections.abc
+import json
+import logging
+import os
+import shelve
+import tempfile
+import time
+from datetime import datetime
+from typing import Any, Optional
+
+log = logging.getLogger("state_store")
+
+STATE_SCHEMA_VERSION = 2
+_BYTES_MARKER = "__metube_bytes__"
+_DATETIME_MARKER = "__metube_datetime__"
+
+
+def to_json_compatible(value: Any) -> Any:
+    if value is None or isinstance(value, (bool, int, float, str)):
+        return value
+    if isinstance(value, bytes):
+        return {_BYTES_MARKER: base64.b64encode(value).decode("ascii")}
+    if isinstance(value, datetime):
+        return {_DATETIME_MARKER: value.isoformat()}
+    if isinstance(value, collections.abc.Mapping):
+        return {str(k): to_json_compatible(v) for k, v in value.items()}
+    if isinstance(value, (list, tuple, set, frozenset)):
+        return [to_json_compatible(v) for v in value]
+    if isinstance(value, collections.abc.Iterable):
+        return [to_json_compatible(v) for v in value]
+    raise TypeError(f"Value of type {type(value).__name__} is not JSON serializable")
+
+
+def from_json_compatible(value: Any) -> Any:
+    if isinstance(value, list):
+        return [from_json_compatible(v) for v in value]
+    if isinstance(value, dict):
+        if set(value.keys()) == {_BYTES_MARKER}:
+            return base64.b64decode(value[_BYTES_MARKER].encode("ascii"))
+        if set(value.keys()) == {_DATETIME_MARKER}:
+            return datetime.fromisoformat(value[_DATETIME_MARKER])
+        return {k: from_json_compatible(v) for k, v in value.items()}
+    return value
+
+
+def read_legacy_shelf(path: str) -> Optional[list[tuple[Any, Any]]]:
+    if not os.path.exists(path):
+        return None
+    try:
+        with shelve.open(path, "r") as shelf:
+            return list(shelf.items())
+    except Exception as exc:
+        log.warning("Could not read legacy shelf at %s: %s", path, exc)
+        return None
+
+
+class AtomicJsonStore:
+    def __init__(self, path: str, *, kind: str, schema_version: int = STATE_SCHEMA_VERSION):
+        self.path = path
+        self.kind = kind
+        self.schema_version = schema_version
+
+    def _ensure_parent(self) -> None:
+        parent = os.path.dirname(self.path)
+        if parent and not os.path.isdir(parent):
+            os.makedirs(parent, exist_ok=True)
+
+    def _build_payload(self, data: dict[str, Any]) -> dict[str, Any]:
+        payload = {
+            "schema_version": self.schema_version,
+            "kind": self.kind,
+        }
+        payload.update(data)
+        return payload
+
+    def load(self) -> Optional[dict[str, Any]]:
+        if not os.path.exists(self.path):
+            return None
+        try:
+            with open(self.path, encoding="utf-8") as f:
+                payload = json.load(f)
+            if not isinstance(payload, dict):
+                raise ValueError("State file must contain a JSON object")
+            if payload.get("kind") != self.kind:
+                raise ValueError(
+                    f"State file kind mismatch: expected {self.kind}, got {payload.get('kind')}"
+                )
+            return payload
+        except Exception as exc:
+            self.quarantine_invalid_file(exc)
+            return None
+
+    def save(self, data: dict[str, Any]) -> None:
+        self._ensure_parent()
+        payload = self._build_payload(data)
+        parent = os.path.dirname(self.path) or "."
+        fd, tmp_path = tempfile.mkstemp(
+            prefix=f".{os.path.basename(self.path)}.",
+            suffix=".tmp",
+            dir=parent,
+            text=True,
+        )
+        try:
+            with os.fdopen(fd, "w", encoding="utf-8") as f:
+                json.dump(payload, f, ensure_ascii=False, separators=(",", ":"))
+                f.write("\n")
+                f.flush()
+                os.fsync(f.fileno())
+            os.replace(tmp_path, self.path)
+            self._fsync_directory(parent)
+        except Exception:
+            try:
+                os.remove(tmp_path)
+            except OSError:
+                pass
+            raise
+
+    def quarantine_invalid_file(self, exc: Exception) -> None:
+        if not os.path.exists(self.path):
+            return
+        ts = time.strftime("%Y%m%d%H%M%S")
+        backup_path = f"{self.path}.invalid.{ts}"
+        try:
+            os.replace(self.path, backup_path)
+            log.warning(
+                "State file at %s was invalid (%s); moved it to %s",
+                self.path,
+                exc,
+                backup_path,
+            )
+        except OSError as move_exc:
+            log.warning(
+                "State file at %s was invalid (%s) and could not be moved aside: %s",
+                self.path,
+                exc,
+                move_exc,
+            )
+
+    @staticmethod
+    def _fsync_directory(path: str) -> None:
+        try:
+            flags = os.O_RDONLY
+            if hasattr(os, "O_DIRECTORY"):
+                flags |= os.O_DIRECTORY
+            fd = os.open(path, flags)
+        except OSError:
+            return
+        try:
+            os.fsync(fd)
+        except OSError:
+            pass
+        finally:
+            os.close(fd)

app/subscriptions.py

@@ -0,0 +1,666 @@
+"""Channel/playlist subscriptions: periodic yt-dlp flat extract + queue new videos."""
+
+from __future__ import annotations
+
+import asyncio
+import copy
+import logging
+import os
+import time
+import types
+import uuid
+from dataclasses import dataclass, field, fields
+from typing import Any, Optional
+
+import yt_dlp
+import yt_dlp.networking.impersonate
+from state_store import AtomicJsonStore, read_legacy_shelf
+
+log = logging.getLogger("subscriptions")
+
+VIDEO_ONLY_MSG = (
+    "This URL points to a single video, not a channel or playlist. Use Download instead."
+)
+_MEDIA_HINT_FIELDS = (
+    "duration",
+    "timestamp",
+    "release_timestamp",
+    "upload_date",
+    "view_count",
+    "live_status",
+    "availability",
+)
+
+
+def _impersonate_opt(ytdl_options: dict) -> dict:
+    opts = dict(ytdl_options)
+    if "impersonate" in opts:
+        opts["impersonate"] = yt_dlp.networking.impersonate.ImpersonateTarget.from_str(
+            opts["impersonate"]
+        )
+    return opts
+
+
+def _build_ydl_params(config, *, playlistend: Optional[int] = None) -> dict:
+    params: dict[str, Any] = {
+        "quiet": not logging.getLogger().isEnabledFor(logging.DEBUG),
+        "verbose": logging.getLogger().isEnabledFor(logging.DEBUG),
+        "no_color": True,
+        "extract_flat": True,
+        "ignore_no_formats_error": True,
+        "lazy_playlist": True,
+        "paths": {"home": config.DOWNLOAD_DIR, "temp": config.TEMP_DIR},
+        **config.YTDL_OPTIONS,
+    }
+    params = _impersonate_opt(params)
+    if playlistend is not None and playlistend > 0:
+        params["playlistend"] = playlistend
+    return params
+
+
+def _is_media_entry(entry: Any) -> bool:
+    if not isinstance(entry, dict):
+        return False
+    etype = str(entry.get("_type") or "")
+    if etype in ("playlist", "multi_video", "channel"):
+        return False
+    if entry.get("entries"):
+        return False
+    url = _entry_video_url(entry)
+    if not url:
+        return False
+    ie_key = str(entry.get("ie_key") or entry.get("extractor_key") or "").lower()
+    if any(token in ie_key for token in ("playlist", "channel", "tab")):
+        return any(entry.get(field) is not None for field in _MEDIA_HINT_FIELDS)
+    return True
+
+
+def extract_flat_playlist(config, url: str, playlistend: int, *, _depth: int = 0):
+    """Return (info_dict, entries_list) for playlist/channel URLs."""
+    params = _build_ydl_params(config, playlistend=playlistend)
+    with yt_dlp.YoutubeDL(params=params) as ydl:
+        info = ydl.extract_info(url, download=False)
+    if not info:
+        return None, []
+    etype = info.get("_type") or "video"
+    if etype == "video":
+        return info, []
+    if etype in ("playlist", "channel"):
+        entries = info.get("entries") or []
+        if isinstance(entries, types.GeneratorType):
+            entries = list(entries)
+        # Drop None placeholders from incomplete flat playlists
+        entries = [e for e in entries if e]
+        media_entries = [e for e in entries if _is_media_entry(e)]
+        if media_entries:
+            return info, media_entries
+        if _depth < 1:
+            for ent in entries[:5]:
+                nested_url = _entry_video_url(ent)
+                if not nested_url:
+                    continue
+                nested_info, nested_entries = extract_flat_playlist(
+                    config,
+                    nested_url,
+                    playlistend,
+                    _depth=_depth + 1,
+                )
+                if nested_entries:
+                    return nested_info, nested_entries
+        return info, entries
+    if etype.startswith("url") and info.get("url"):
+        # Single nested URL without playlist wrapper — treat as non-subscribable
+        return info, []
+    return info, []
+
+
+def _entry_video_url(entry: dict) -> Optional[str]:
+    return entry.get("webpage_url") or entry.get("url")
+
+
+def _entry_id(entry: dict) -> Optional[str]:
+    eid = entry.get("id")
+    if eid is not None:
+        return str(eid)
+    url = _entry_video_url(entry)
+    return url
+
+
+@dataclass
+class SubscriptionInfo:
+    id: str
+    name: str
+    url: str
+    enabled: bool = True
+    check_interval_minutes: int = 60
+    download_type: str = "video"
+    codec: str = "auto"
+    format: str = "any"
+    quality: str = "best"
+    folder: str = ""
+    custom_name_prefix: str = ""
+    auto_start: bool = True
+    playlist_item_limit: int = 0
+    split_by_chapters: bool = False
+    chapter_template: str = ""
+    subtitle_language: str = "en"
+    subtitle_mode: str = "prefer_manual"
+    last_checked: Optional[float] = None
+    seen_ids: list[str] = field(default_factory=list)
+    error: Optional[str] = None
+    timestamp: float = field(default_factory=time.time)
+
+    def seen_set(self) -> set[str]:
+        return set(self.seen_ids)
+
+    def to_public_dict(self) -> dict:
+        return {
+            "id": self.id,
+            "name": self.name,
+            "url": self.url,
+            "enabled": self.enabled,
+            "check_interval_minutes": self.check_interval_minutes,
+            "download_type": self.download_type,
+            "codec": self.codec,
+            "format": self.format,
+            "quality": self.quality,
+            "folder": self.folder,
+            "last_checked": self.last_checked,
+            "seen_count": len(self.seen_ids),
+            "error": self.error,
+        }
+
+
+def _subscription_to_record(sub: SubscriptionInfo) -> dict[str, Any]:
+    return {
+        "id": sub.id,
+        "name": sub.name,
+        "url": sub.url,
+        "enabled": sub.enabled,
+        "check_interval_minutes": sub.check_interval_minutes,
+        "download_type": sub.download_type,
+        "codec": sub.codec,
+        "format": sub.format,
+        "quality": sub.quality,
+        "folder": sub.folder,
+        "custom_name_prefix": sub.custom_name_prefix,
+        "auto_start": sub.auto_start,
+        "playlist_item_limit": sub.playlist_item_limit,
+        "split_by_chapters": sub.split_by_chapters,
+        "chapter_template": sub.chapter_template,
+        "subtitle_language": sub.subtitle_language,
+        "subtitle_mode": sub.subtitle_mode,
+        "last_checked": sub.last_checked,
+        "seen_ids": list(sub.seen_ids),
+        "error": sub.error,
+    }
+
+
+def _subscription_from_record(record: Any) -> Optional[SubscriptionInfo]:
+    field_names = {f.name for f in fields(SubscriptionInfo)}
+    if isinstance(record, SubscriptionInfo):
+        return record
+    if isinstance(record, dict):
+        try:
+            return SubscriptionInfo(**{k: v for k, v in record.items() if k in field_names})
+        except TypeError:
+            return None
+    return None
+
+
+class SubscriptionNotifier:
+    """Hook for Socket.IO / UI updates."""
+
+    async def subscription_added(self, sub: SubscriptionInfo) -> None:
+        raise NotImplementedError
+
+    async def subscription_updated(self, sub: SubscriptionInfo) -> None:
+        raise NotImplementedError
+
+    async def subscription_removed(self, sub_id: str) -> None:
+        raise NotImplementedError
+
+    async def subscriptions_all(self, subs: list[SubscriptionInfo]) -> None:
+        raise NotImplementedError
+
+
+class SubscriptionManager:
+    def __init__(self, config, download_queue, notifier: SubscriptionNotifier):
+        self.config = config
+        self.dqueue = download_queue
+        self.notifier = notifier
+        pdir = config.STATE_DIR
+        if not os.path.isdir(pdir):
+            os.makedirs(pdir, exist_ok=True)
+        self._legacy_path = os.path.join(pdir, "subscriptions")
+        self._path = os.path.join(pdir, "subscriptions.json")
+        self._store = AtomicJsonStore(self._path, kind="subscriptions")
+        self._subs: dict[str, SubscriptionInfo] = {}
+        self._url_index: dict[str, str] = {}  # normalized url -> id
+        self._pending_urls: set[str] = set()
+        self._lock = asyncio.Lock()
+        self._loop_task: Optional[asyncio.Task] = None
+        self._load_all()
+
+    def close(self) -> None:
+        # No persistent shelf handle to close.
+        return
+
+    def _normalize_url(self, url: str) -> str:
+        return (url or "").strip()
+
+    def _normalize_seen_ids(self, seen_ids: list[str]) -> list[str]:
+        max_seen = int(getattr(self.config, "SUBSCRIPTION_MAX_SEEN_IDS", 50000))
+        normalized = [str(sid) for sid in dict.fromkeys(seen_ids)]
+        if len(normalized) > max_seen:
+            normalized = normalized[:max_seen]
+        return normalized
+
+    def _load_all(self) -> None:
+        payload = self._store.load()
+        loaded_from_legacy = False
+        if payload is not None:
+            records = payload.get("items") or []
+        else:
+            legacy_items = read_legacy_shelf(self._legacy_path)
+            records = [raw for _key, raw in legacy_items] if legacy_items else []
+            if records:
+                loaded_from_legacy = True
+
+        loaded_subs = self._iter_valid_subs(records)
+        compact_records = []
+        for sub in loaded_subs:
+            sub.seen_ids = self._normalize_seen_ids(sub.seen_ids)
+            self._subs[sub.id] = sub
+            self._url_index[self._normalize_url(sub.url)] = sub.id
+            compact_records.append(_subscription_to_record(sub))
+
+        if loaded_from_legacy or (
+            payload is not None
+            and (
+                payload.get("schema_version") != self._store.schema_version
+                or compact_records != records
+            )
+        ):
+            self._store.save({"items": compact_records})
+
+    def _iter_valid_subs(self, records: list[Any]) -> list[SubscriptionInfo]:
+        subs: list[SubscriptionInfo] = []
+        for record in records:
+            sub = _subscription_from_record(record)
+            if sub is not None:
+                subs.append(sub)
+        return subs
+
+    def _save_locked(self) -> None:
+        self._store.save({"items": [_subscription_to_record(sub) for sub in self._subs.values()]})
+
+    async def _queue_subscription_entries(
+        self,
+        entries: list[dict],
+        *,
+        download_type: str,
+        codec: str,
+        format: str,
+        quality: str,
+        folder: str,
+        custom_name_prefix: str,
+        playlist_item_limit: int,
+        auto_start: bool,
+        split_by_chapters: bool,
+        chapter_template: str,
+        subtitle_language: str,
+        subtitle_mode: str,
+    ) -> tuple[list[str], list[str]]:
+        queued_ids: list[str] = []
+        queue_errors: list[str] = []
+        for ent in entries:
+            eid = _entry_id(ent)
+            vurl = _entry_video_url(ent)
+            if not eid or not vurl:
+                continue
+            queue_entry = dict(ent)
+            queue_entry["_type"] = "video"
+            queue_entry["webpage_url"] = vurl
+            result = await self.dqueue.add_entry(
+                queue_entry,
+                download_type,
+                codec,
+                format,
+                quality,
+                folder or None,
+                custom_name_prefix,
+                playlist_item_limit,
+                auto_start,
+                split_by_chapters,
+                chapter_template or None,
+                subtitle_language,
+                subtitle_mode,
+            )
+            if isinstance(result, dict) and result.get("status") == "error":
+                msg = str(result.get("msg") or f"Queueing failed for {vurl}")
+                queue_errors.append(msg)
+                log.warning("Subscription queueing failed for %s: %s", vurl, msg)
+                continue
+            queued_ids.append(eid)
+        return queued_ids, queue_errors
+
+    def list_all(self) -> list[SubscriptionInfo]:
+        return list(self._subs.values())
+
+    def get(self, sub_id: str) -> Optional[SubscriptionInfo]:
+        return self._subs.get(sub_id)
+
+    def start_background_loop(self) -> None:
+        if self._loop_task is not None and not self._loop_task.done():
+            return
+        self._loop_task = asyncio.create_task(self._periodic_loop())
+        self._loop_task.add_done_callback(
+            lambda t: log.error("Subscription loop failed: %s", t.exception())
+            if not t.cancelled() and t.exception()
+            else None
+        )
+
+    async def _periodic_loop(self) -> None:
+        while True:
+            await asyncio.sleep(60)
+            try:
+                await self.run_due_checks()
+            except Exception as e:
+                log.exception("Subscription periodic check error: %s", e)
+
+    async def run_due_checks(self) -> None:
+        now = time.time()
+        due: list[SubscriptionInfo] = []
+        async with self._lock:
+            for sub in list(self._subs.values()):
+                if not sub.enabled:
+                    continue
+                interval_sec = max(60, int(sub.check_interval_minutes) * 60)
+                if sub.last_checked is None:
+                    due.append(sub)
+                    continue
+                if now - sub.last_checked < interval_sec:
+                    continue
+                due.append(sub)
+        for sub in due:
+            await self._check_one_unlocked(sub)
+
+    async def add_subscription(
+        self,
+        url: str,
+        *,
+        check_interval_minutes: int,
+        download_type: str,
+        codec: str,
+        format: str,
+        quality: str,
+        folder: str,
+        custom_name_prefix: str,
+        auto_start: bool,
+        playlist_item_limit: int,
+        split_by_chapters: bool,
+        chapter_template: str,
+        subtitle_language: str,
+        subtitle_mode: str,
+    ) -> dict:
+        url = self._normalize_url(url)
+        if not url:
+            return {"status": "error", "msg": "Missing URL"}
+
+        async with self._lock:
+            if url in self._url_index or url in self._pending_urls:
+                return {"status": "error", "msg": "This URL is already subscribed"}
+            self._pending_urls.add(url)
+
+        try:
+            scan_first = max(int(getattr(self.config, "SUBSCRIPTION_SCAN_PLAYLIST_END", 50)), 1)
+            try:
+                info, entries = extract_flat_playlist(self.config, url, scan_first)
+            except yt_dlp.utils.YoutubeDLError as exc:
+                return {"status": "error", "msg": str(exc)}
+
+            if not info:
+                return {"status": "error", "msg": "Could not resolve URL"}
+
+            etype = info.get("_type") or "video"
+            if etype not in ("playlist", "channel"):
+                return {"status": "error", "msg": VIDEO_ONLY_MSG}
+
+            name = (
+                info.get("title")
+                or info.get("channel")
+                or info.get("playlist_title")
+                or info.get("uploader")
+                or url
+            )
+
+            seen_entries = [ent for ent in entries if _is_media_entry(ent)]
+            all_ids: list[str] = []
+            for ent in seen_entries:
+                eid = _entry_id(ent)
+                if eid:
+                    all_ids.append(eid)
+
+            sub = SubscriptionInfo(
+                id=str(uuid.uuid4()),
+                name=str(name),
+                url=url,
+                enabled=True,
+                check_interval_minutes=max(1, int(check_interval_minutes)),
+                download_type=download_type,
+                codec=codec,
+                format=format,
+                quality=quality,
+                folder=folder or "",
+                custom_name_prefix=custom_name_prefix or "",
+                auto_start=bool(auto_start),
+                playlist_item_limit=int(playlist_item_limit),
+                split_by_chapters=bool(split_by_chapters),
+                chapter_template=chapter_template or "",
+                subtitle_language=subtitle_language,
+                subtitle_mode=subtitle_mode,
+                last_checked=time.time(),
+                seen_ids=list(dict.fromkeys(all_ids)),
+                error=None,
+            )
+
+            async with self._lock:
+                if url in self._url_index:
+                    return {"status": "error", "msg": "This URL is already subscribed"}
+                self._subs[sub.id] = sub
+                self._url_index[url] = sub.id
+                try:
+                    self._save_locked()
+                except Exception:
+                    self._subs.pop(sub.id, None)
+                    self._url_index.pop(url, None)
+                    raise
+
+            await self.notifier.subscription_added(sub)
+            return {"status": "ok", "subscription": sub.to_public_dict()}
+        finally:
+            async with self._lock:
+                self._pending_urls.discard(url)
+
+    async def delete_subscriptions(self, ids: list[str]) -> dict:
+        removed: list[str] = []
+        async with self._lock:
+            previous_subs = self._subs.copy()
+            previous_index = self._url_index.copy()
+            for sid in ids:
+                sub = self._subs.pop(sid, None)
+                if sub:
+                    normalized_url = self._normalize_url(sub.url)
+                    self._url_index.pop(normalized_url, None)
+                    removed.append(sid)
+            if removed:
+                try:
+                    self._save_locked()
+                except Exception:
+                    self._subs = previous_subs
+                    self._url_index = previous_index
+                    raise
+        for sid in removed:
+            await self.notifier.subscription_removed(sid)
+        return {"status": "ok"}
+
+    async def update_subscription(self, sub_id: str, changes: dict) -> dict:
+        async with self._lock:
+            sub = self._subs.get(sub_id)
+            if not sub:
+                return {"status": "error", "msg": "Subscription not found"}
+            previous = copy.deepcopy(sub)
+            old_enabled = sub.enabled
+
+            if "enabled" in changes:
+                sub.enabled = bool(changes["enabled"])
+            if "check_interval_minutes" in changes:
+                sub.check_interval_minutes = max(1, int(changes["check_interval_minutes"]))
+            if "name" in changes and changes["name"]:
+                sub.name = str(changes["name"])
+
+            try:
+                self._save_locked()
+            except Exception:
+                self._subs[sub_id] = previous
+                raise
+            updated = sub
+        if "enabled" in changes and updated.enabled != old_enabled:
+            log.info(
+                "Subscription %s %s",
+                updated.name,
+                "resumed" if updated.enabled else "paused",
+            )
+        await self.notifier.subscription_updated(updated)
+        return {"status": "ok", "subscription": updated.to_public_dict()}
+
+    async def check_now(self, ids: Optional[list[str]] = None) -> dict:
+        async with self._lock:
+            targets = (
+                [self._subs[i] for i in ids if i in self._subs]
+                if ids
+                else [s for s in self._subs.values() if s.enabled]
+            )
+        log.info(
+            "Manual subscription check requested for %d subscription(s)",
+            len(targets),
+        )
+        for sub in targets:
+            await self._check_one_unlocked(sub)
+        return {"status": "ok"}
+
+    async def _check_one_unlocked(self, sub: SubscriptionInfo) -> None:
+        sid = sub.id
+        scan = int(getattr(self.config, "SUBSCRIPTION_SCAN_PLAYLIST_END", 50))
+        log.info("Checking subscription: %s", sub.name)
+        try:
+            info, entries = extract_flat_playlist(self.config, sub.url, scan)
+        except yt_dlp.utils.YoutubeDLError as exc:
+            async with self._lock:
+                cur = self._subs.get(sid)
+                if cur:
+                    previous = copy.deepcopy(cur)
+                    cur.error = str(exc)
+                    try:
+                        self._save_locked()
+                    except Exception:
+                        self._subs[sid] = previous
+                        raise
+                    sub = cur
+            log.warning("Subscription check failed for %s: %s", sub.name, exc)
+            await self.notifier.subscription_updated(sub)
+            return
+        entries = [ent for ent in entries if _is_media_entry(ent)]
+
+        etype = (info or {}).get("_type") or "video"
+        if etype == "video" or not entries:
+            async with self._lock:
+                cur = self._subs.get(sid)
+                if cur:
+                    previous = copy.deepcopy(cur)
+                    cur.error = VIDEO_ONLY_MSG
+                    try:
+                        self._save_locked()
+                    except Exception:
+                        self._subs[sid] = previous
+                        raise
+                    sub = cur
+            log.warning("Subscription %s no longer resolves to a subscribable feed", sub.name)
+            await self.notifier.subscription_updated(sub)
+            return
+
+        async with self._lock:
+            cur = self._subs.get(sid)
+            if not cur:
+                return
+            seen = cur.seen_set()
+            seen_ids_snapshot = list(cur.seen_ids)
+            dl_type = cur.download_type
+            dl_codec = cur.codec
+            dl_format = cur.format
+            dl_quality = cur.quality
+            dl_folder = cur.folder
+            dl_prefix = cur.custom_name_prefix
+            dl_plimit = cur.playlist_item_limit
+            dl_autostart = cur.auto_start
+            dl_split = cur.split_by_chapters
+            dl_chapter = cur.chapter_template
+            dl_sublang = cur.subtitle_language
+            dl_submode = cur.subtitle_mode
+
+        new_entries: list[dict] = []
+        new_ids: list[str] = []
+        for ent in entries:
+            eid = _entry_id(ent)
+            if not eid or eid in seen:
+                continue
+            new_entries.append(ent)
+            new_ids.append(eid)
+
+        queued_ids, queue_errors = await self._queue_subscription_entries(
+            new_entries,
+            download_type=dl_type,
+            codec=dl_codec,
+            format=dl_format,
+            quality=dl_quality,
+            folder=dl_folder,
+            custom_name_prefix=dl_prefix,
+            playlist_item_limit=dl_plimit,
+            auto_start=dl_autostart,
+            split_by_chapters=dl_split,
+            chapter_template=dl_chapter or "",
+            subtitle_language=dl_sublang,
+            subtitle_mode=dl_submode,
+        )
+        log.info(
+            "Subscription check finished for %s: %d new, %d queued, %d failed",
+            sub.name,
+            len(new_entries),
+            len(queued_ids),
+            len(queue_errors),
+        )
+
+        merged = list(dict.fromkeys(queued_ids + seen_ids_snapshot))
+        max_seen = int(getattr(self.config, "SUBSCRIPTION_MAX_SEEN_IDS", 50000))
+        if len(merged) > max_seen:
+            merged = merged[:max_seen]
+
+        async with self._lock:
+            cur = self._subs.get(sid)
+            if not cur:
+                return
+            previous = copy.deepcopy(cur)
+            cur.seen_ids = merged
+            cur.last_checked = time.time()
+            cur.error = "; ".join(queue_errors[:3]) if queue_errors else None
+            try:
+                self._save_locked()
+            except Exception:
+                self._subs[sid] = previous
+                raise
+            sub = cur
+        await self.notifier.subscription_updated(sub)
+
+    async def emit_all(self) -> None:
+        await self.notifier.subscriptions_all(self.list_all())

app/tests/test_download_queue.py

@@ -144,3 +144,34 @@ async def test_start_pending_moves_to_queue(dq_env):
     with patch.object(DownloadQueue, "_DownloadQueue__start_download", AsyncMock()):
         await dq.start_pending([url])
     assert not dq.pending.exists(url)
+
+
+@pytest.mark.asyncio
+async def test_add_entry_queues_single_video_without_reextracting(dq_env):
+    notifier = AsyncMock()
+    dq = DownloadQueue(dq_env, notifier)
+    entry = {
+        "_type": "video",
+        "id": "vid1",
+        "title": "Test Video",
+        "url": "https://example.com/watch?v=1",
+        "webpage_url": "https://example.com/watch?v=1",
+        "playlist_index": "01",
+        "playlist_title": "Playlist",
+    }
+
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", side_effect=AssertionError("should not re-extract")):
+        result = await dq.add_entry(
+            entry,
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+        )
+
+    assert result["status"] == "ok"
+    assert dq.pending.exists("https://example.com/watch?v=1")

app/tests/test_persistent_queue.py

@@ -1,10 +1,38 @@
-"""Integration tests for ``PersistentQueue`` (shelve-backed storage)."""
+"""Integration tests for ``PersistentQueue`` using the JSON state store."""
 
 from __future__ import annotations
 
+import json
 import os
+import shelve
+import sys
 import tempfile
+import types
 import unittest
+from unittest.mock import patch
+
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+fake_utils = types.ModuleType("yt_dlp.utils")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>{})\)(?P<format>[-0-9.]*{})"
+fake_utils.STR_FORMAT_TYPES = "diouxXeEfFgGcrsa"
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = fake_utils
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+sys.modules.setdefault("yt_dlp.utils", fake_utils)
 
 from ytdl import DownloadInfo, PersistentQueue
 
@@ -35,6 +63,12 @@ def _make_info(url: str = "https://example.com/v") -> DownloadInfo:
     )
 
 
+def _create_legacy_shelf(path: str, *infos: DownloadInfo) -> None:
+    with shelve.open(path, "c") as shelf:
+        for info in infos:
+            shelf[info.url] = info
+
+
 class PersistentQueueTests(unittest.TestCase):
     def test_put_get_delete_roundtrip(self):
         with tempfile.TemporaryDirectory() as tmp:
@@ -42,6 +76,7 @@ class PersistentQueueTests(unittest.TestCase):
             pq = PersistentQueue("queue", path)
             dl = _FakeDownload(_make_info("http://a.example"))
             pq.put(dl)
+            self.assertTrue(os.path.exists(path + ".json"))
             self.assertTrue(pq.exists("http://a.example"))
             self.assertFalse(pq.empty())
             got = pq.get("http://a.example")
@@ -62,7 +97,7 @@ class PersistentQueueTests(unittest.TestCase):
             keys = [k for k, _ in pq.saved_items()]
             self.assertEqual(keys, ["http://first.example", "http://second.example"])
 
-    def test_load_restores_from_shelve(self):
+    def test_load_restores_from_json(self):
         with tempfile.TemporaryDirectory() as tmp:
             path = os.path.join(tmp, "queue")
             pq1 = PersistentQueue("queue", path)
@@ -71,6 +106,186 @@ class PersistentQueueTests(unittest.TestCase):
             pq2.load()
             self.assertTrue(pq2.exists("http://load.example"))
 
+    def test_load_imports_legacy_shelve(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            _create_legacy_shelf(path, _make_info("http://legacy.example"))
+            pq = PersistentQueue("queue", path)
+            pq.load()
+            self.assertTrue(pq.exists("http://legacy.example"))
+            self.assertTrue(os.path.exists(path + ".json"))
+
+    def test_queue_persists_only_compact_entry_subset(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            info = _make_info("http://entry.example")
+            info.entry = {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "channel_index": "02",
+                "channel_title": "Channel",
+                "formats": [{"id": "huge"}],
+                "description": "very large payload",
+            }
+            pq.put(_FakeDownload(info))
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertEqual(
+                record["entry"],
+                {
+                    "playlist_index": "01",
+                    "playlist_title": "Playlist",
+                    "channel_index": "02",
+                    "channel_title": "Channel",
+                },
+            )
+            self.assertNotIn("formats", record["entry"])
+            self.assertNotIn("description", record["entry"])
+
+    def test_completed_queue_does_not_persist_entry_or_transient_progress(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "completed")
+            pq = PersistentQueue("completed", path)
+            info = _make_info("http://done.example")
+            info.status = "finished"
+            info.percent = 88
+            info.speed = 123
+            info.eta = 9
+            info.entry = {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "formats": [{"id": "huge"}],
+            }
+            info.filename = "done.mp4"
+            pq.put(_FakeDownload(info))
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertNotIn("entry", record)
+            self.assertNotIn("percent", record)
+            self.assertNotIn("speed", record)
+            self.assertNotIn("eta", record)
+            self.assertEqual(record["filename"], "done.mp4")
+
+    def test_invalid_json_is_quarantined_and_legacy_is_imported(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            _create_legacy_shelf(path, _make_info("http://legacy.example"))
+            with open(path + ".json", "w", encoding="utf-8") as f:
+                f.write("{not valid json")
+
+            pq = PersistentQueue("queue", path)
+            pq.load()
+
+            self.assertTrue(pq.exists("http://legacy.example"))
+            self.assertTrue(
+                any(name.startswith("queue.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_loading_old_json_rewrites_to_compact_format(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            with open(path + ".json", "w", encoding="utf-8") as f:
+                json.dump(
+                    {
+                        "schema_version": 1,
+                        "kind": "persistent_queue:queue",
+                        "items": [
+                            {
+                                "key": "http://legacy-json.example",
+                                "info": {
+                                    "id": "id1",
+                                    "title": "Title",
+                                    "url": "http://legacy-json.example",
+                                    "quality": "best",
+                                    "download_type": "video",
+                                    "codec": "auto",
+                                    "format": "any",
+                                    "folder": "",
+                                    "custom_name_prefix": "",
+                                    "playlist_item_limit": 0,
+                                    "split_by_chapters": False,
+                                    "chapter_template": "",
+                                    "subtitle_language": "en",
+                                    "subtitle_mode": "prefer_manual",
+                                    "status": "pending",
+                                    "timestamp": 1,
+                                    "entry": {
+                                        "playlist_index": "01",
+                                        "playlist_title": "Playlist",
+                                        "formats": [{"id": "huge"}],
+                                    },
+                                    "percent": 15,
+                                    "speed": 20,
+                                    "eta": 30,
+                                },
+                            }
+                        ],
+                    },
+                    f,
+                )
+
+            pq = PersistentQueue("queue", path)
+            pq.load()
+
+            with open(path + ".json", encoding="utf-8") as f:
+                payload = json.load(f)
+
+            record = payload["items"][0]["info"]
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(record["entry"], {"playlist_index": "01", "playlist_title": "Playlist"})
+            self.assertNotIn("percent", record)
+            self.assertNotIn("speed", record)
+            self.assertNotIn("eta", record)
+
+    def test_put_rollbacks_in_memory_queue_when_state_write_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            dl = _FakeDownload(_make_info("http://rollback.example"))
+            self.assertFalse(pq.exists("http://rollback.example"))
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == path + ".json":
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch("ytdl.AtomicJsonStore.save", bad_save):
+                with self.assertRaises(OSError):
+                    pq.put(dl)
+
+            self.assertFalse(pq.exists("http://rollback.example"))
+
+    def test_put_rollbacks_to_previous_download_when_replace_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue")
+            pq = PersistentQueue("queue", path)
+            first = _FakeDownload(_make_info("http://same.example"))
+            second = _FakeDownload(_make_info("http://same.example"))
+            second.info.title = "Replaced title"
+            pq.put(first)
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == path + ".json":
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch("ytdl.AtomicJsonStore.save", bad_save):
+                with self.assertRaises(OSError):
+                    pq.put(second)
+
+            self.assertEqual(pq.get("http://same.example").info.title, "Title")
+
 
 if __name__ == "__main__":
     unittest.main()

app/tests/test_state_store.py

@@ -0,0 +1,53 @@
+from __future__ import annotations
+
+import os
+import tempfile
+import unittest
+from datetime import datetime
+
+from state_store import AtomicJsonStore, from_json_compatible, to_json_compatible
+
+
+class StateStoreTests(unittest.TestCase):
+    def test_save_and_load_roundtrip(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue.json")
+            store = AtomicJsonStore(path, kind="persistent_queue:queue")
+            store.save({"items": [{"key": "a", "info": {"title": "hello"}}]})
+
+            payload = store.load()
+
+            self.assertEqual(payload["kind"], "persistent_queue:queue")
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(payload["items"][0]["info"]["title"], "hello")
+
+    def test_invalid_file_is_quarantined(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            path = os.path.join(tmp, "queue.json")
+            with open(path, "w", encoding="utf-8") as f:
+                f.write("{broken")
+
+            store = AtomicJsonStore(path, kind="persistent_queue:queue")
+            payload = store.load()
+
+            self.assertIsNone(payload)
+            self.assertTrue(
+                any(name.startswith("queue.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_json_compat_helpers_roundtrip_bytes_and_datetime(self):
+        raw = {
+            "payload": b"abc",
+            "timestamp": datetime(2024, 1, 2, 3, 4, 5),
+            "items": (1, 2, 3),
+        }
+
+        restored = from_json_compatible(to_json_compatible(raw))
+
+        self.assertEqual(restored["payload"], b"abc")
+        self.assertEqual(restored["timestamp"], datetime(2024, 1, 2, 3, 4, 5))
+        self.assertEqual(restored["items"], [1, 2, 3])
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_subscriptions.py

@@ -0,0 +1,443 @@
+from __future__ import annotations
+
+import json
+import os
+import shelve
+import sys
+import tempfile
+import types
+import unittest
+from unittest.mock import patch
+
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = types.SimpleNamespace(YoutubeDLError=Exception)
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+
+from subscriptions import SubscriptionManager, extract_flat_playlist
+
+
+class _Config:
+    def __init__(self, state_dir: str):
+        self.STATE_DIR = state_dir
+        self.SUBSCRIPTION_SCAN_PLAYLIST_END = 50
+        self.SUBSCRIPTION_MAX_SEEN_IDS = 50000
+        self.DOWNLOAD_DIR = state_dir
+        self.TEMP_DIR = state_dir
+        self.YTDL_OPTIONS = {}
+
+
+class _Queue:
+    def __init__(self):
+        self.entries = []
+        self.fail = False
+
+    async def add(self, *args, **kwargs):
+        return None
+
+    async def add_entry(self, entry, *args, **kwargs):
+        if self.fail:
+            return {"status": "error", "msg": "queue failed"}
+        self.entries.append((entry, args, kwargs))
+        return {"status": "ok"}
+
+
+class _Notifier:
+    async def subscription_added(self, sub):
+        return None
+
+    async def subscription_updated(self, sub):
+        return None
+
+    async def subscription_removed(self, sub_id):
+        return None
+
+    async def subscriptions_all(self, subs):
+        return None
+
+
+def _create_legacy_shelf(path: str, record) -> None:
+    with shelve.open(path, "c") as shelf:
+        shelf["sub-1"] = record
+
+
+class SubscriptionPersistenceTests(unittest.IsolatedAsyncioTestCase):
+    def test_load_imports_legacy_subscription_shelf(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            legacy_path = os.path.join(tmp, "subscriptions")
+            json_path = os.path.join(tmp, "subscriptions.json")
+            _create_legacy_shelf(
+                legacy_path,
+                {
+                    "id": "sub-1",
+                    "name": "Channel",
+                    "url": "https://example.com/channel",
+                    "timestamp": 1.0,
+                },
+            )
+
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            self.assertEqual(len(mgr.list_all()), 1)
+            self.assertTrue(os.path.exists(json_path))
+            with open(json_path, encoding="utf-8") as f:
+                payload = json.load(f)
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertNotIn("timestamp", payload["items"][0])
+
+    def test_invalid_json_is_quarantined_and_legacy_is_imported(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            legacy_path = os.path.join(tmp, "subscriptions")
+            json_path = os.path.join(tmp, "subscriptions.json")
+            _create_legacy_shelf(
+                legacy_path,
+                {
+                    "id": "sub-1",
+                    "name": "Channel",
+                    "url": "https://example.com/channel",
+                    "timestamp": 1.0,
+                },
+            )
+            with open(json_path, "w", encoding="utf-8") as f:
+                f.write("{not valid json")
+
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            self.assertEqual(len(mgr.list_all()), 1)
+            self.assertTrue(
+                any(name.startswith("subscriptions.json.invalid.") for name in os.listdir(tmp))
+            )
+
+    def test_load_rewrites_old_json_and_trims_seen_ids(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            json_path = os.path.join(tmp, "subscriptions.json")
+            cfg = _Config(tmp)
+            cfg.SUBSCRIPTION_MAX_SEEN_IDS = 2
+            with open(json_path, "w", encoding="utf-8") as f:
+                json.dump(
+                    {
+                        "schema_version": 1,
+                        "kind": "subscriptions",
+                        "items": [
+                            {
+                                "id": "sub-1",
+                                "name": "Channel",
+                                "url": "https://example.com/channel",
+                                "enabled": True,
+                                "check_interval_minutes": 60,
+                                "download_type": "video",
+                                "codec": "auto",
+                                "format": "any",
+                                "quality": "best",
+                                "folder": "",
+                                "custom_name_prefix": "",
+                                "auto_start": True,
+                                "playlist_item_limit": 0,
+                                "split_by_chapters": False,
+                                "chapter_template": "",
+                                "subtitle_language": "en",
+                                "subtitle_mode": "prefer_manual",
+                                "last_checked": None,
+                                "seen_ids": ["a", "b", "a", "c"],
+                                "error": None,
+                                "timestamp": 123,
+                            }
+                        ],
+                    },
+                    f,
+                )
+
+            mgr = SubscriptionManager(cfg, _Queue(), _Notifier())
+            self.assertEqual(mgr.list_all()[0].seen_ids, ["a", "b"])
+
+            with open(json_path, encoding="utf-8") as f:
+                payload = json.load(f)
+
+            self.assertEqual(payload["schema_version"], 2)
+            self.assertEqual(payload["items"][0]["seen_ids"], ["a", "b"])
+            self.assertNotIn("timestamp", payload["items"][0])
+
+    async def test_add_subscription_rolls_back_when_state_write_fails(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            mgr = SubscriptionManager(_Config(tmp), _Queue(), _Notifier())
+
+            orig_save = __import__("state_store").AtomicJsonStore.save
+
+            def bad_save(store, data):
+                if store.path == mgr._path:
+                    raise OSError("simulated shelf failure")
+                return orig_save(store, data)
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [{"id": "v1", "webpage_url": "https://example.com/v1"}],
+                ),
+            ):
+                with patch("subscriptions.AtomicJsonStore.save", bad_save):
+                    with self.assertRaises(OSError):
+                        await mgr.add_subscription(
+                            "https://example.com/channel",
+                            check_interval_minutes=60,
+                            download_type="video",
+                            codec="auto",
+                            format="any",
+                            quality="best",
+                            folder="",
+                            custom_name_prefix="",
+                            auto_start=True,
+                            playlist_item_limit=0,
+                            split_by_chapters=False,
+                            chapter_template="",
+                            subtitle_language="en",
+                            subtitle_mode="prefer_manual",
+                        )
+
+            self.assertEqual(mgr.list_all(), [])
+            self.assertNotIn("https://example.com/channel", mgr._url_index)
+
+    async def test_add_subscription_marks_existing_videos_seen_without_queueing(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [
+                        {"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"},
+                        {"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"},
+                        {"id": "v3", "title": "Three", "webpage_url": "https://example.com/v3"},
+                    ],
+                ),
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+
+            assert result["status"] == "ok"
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.seen_ids, ["v1", "v2", "v3"])
+            self.assertIsNone(sub.error)
+            self.assertEqual(queue.entries, [])
+
+    async def test_add_subscription_skips_collection_tab_entries(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                return_value=(
+                    {"_type": "channel", "title": "Channel"},
+                    [
+                        {
+                            "_type": "url",
+                            "ie_key": "YoutubeTab",
+                            "title": "Channel - Live",
+                            "url": "https://example.com/live",
+                            "webpage_url": "https://example.com/live",
+                        },
+                        {
+                            "_type": "url",
+                            "ie_key": "Youtube",
+                            "id": "v1",
+                            "title": "One",
+                            "duration": 10,
+                            "webpage_url": "https://example.com/v1",
+                        },
+                    ],
+                ),
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+
+            self.assertEqual(result["status"], "ok")
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.seen_ids, ["v1"])
+            self.assertEqual(queue.entries, [])
+
+    async def test_check_now_keeps_failed_queue_items_unseen_and_sets_error(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                side_effect=[
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"}],
+                    ),
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"}],
+                    ),
+                ],
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+                queue.fail = True
+                await mgr.check_now([result["subscription"]["id"]])
+
+            sub = mgr.list_all()[0]
+            self.assertEqual(sub.error, "queue failed")
+            self.assertEqual(sub.seen_ids, ["v1"])
+
+    async def test_check_now_queues_new_video_and_updates_seen_ids(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            queue = _Queue()
+            mgr = SubscriptionManager(_Config(tmp), queue, _Notifier())
+
+            with patch(
+                "subscriptions.extract_flat_playlist",
+                side_effect=[
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [{"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"}],
+                    ),
+                    (
+                        {"_type": "channel", "title": "Channel"},
+                        [
+                            {"id": "v2", "title": "Two", "webpage_url": "https://example.com/v2"},
+                            {"id": "v1", "title": "One", "webpage_url": "https://example.com/v1"},
+                        ],
+                    ),
+                ],
+            ):
+                result = await mgr.add_subscription(
+                    "https://example.com/channel",
+                    check_interval_minutes=60,
+                    download_type="video",
+                    codec="auto",
+                    format="any",
+                    quality="best",
+                    folder="",
+                    custom_name_prefix="",
+                    auto_start=True,
+                    playlist_item_limit=0,
+                    split_by_chapters=False,
+                    chapter_template="",
+                    subtitle_language="en",
+                    subtitle_mode="prefer_manual",
+                )
+                await mgr.check_now([result["subscription"]["id"]])
+
+            sub = mgr.list_all()[0]
+            self.assertIsNotNone(sub.last_checked)
+            self.assertIsNone(sub.error)
+            self.assertEqual(sub.seen_ids[:2], ["v2", "v1"])
+            self.assertEqual([entry["webpage_url"] for entry, _, _ in queue.entries], ["https://example.com/v2"])
+
+class ExtractFlatPlaylistTests(unittest.TestCase):
+    def test_descends_one_level_when_root_entries_are_nested_collections(self):
+        responses = iter(
+            [
+                {
+                    "_type": "channel",
+                    "entries": [
+                        {
+                            "_type": "url",
+                            "ie_key": "YoutubeTab",
+                            "title": "Channel - Videos",
+                            "url": "https://example.com/videos",
+                            "webpage_url": "https://example.com/videos",
+                        }
+                    ],
+                },
+                {
+                    "_type": "playlist",
+                    "entries": [
+                        {
+                            "_type": "url",
+                            "ie_key": "Youtube",
+                            "id": "v1",
+                            "title": "One",
+                            "duration": 10,
+                            "webpage_url": "https://example.com/v1",
+                        }
+                    ],
+                },
+            ]
+        )
+
+        class _FakeYDL:
+            def __init__(self, params):
+                self.params = params
+
+            def __enter__(self):
+                return self
+
+            def __exit__(self, exc_type, exc, tb):
+                return False
+
+            def extract_info(self, url, download=False):
+                return next(responses)
+
+        cfg = _Config(tempfile.mkdtemp())
+        with patch("subscriptions.yt_dlp.YoutubeDL", _FakeYDL, create=True):
+            info, entries = extract_flat_playlist(cfg, "https://example.com/channel", 50)
+
+        self.assertEqual(info.get("_type"), "playlist")
+        self.assertEqual([entry["webpage_url"] for entry in entries], ["https://example.com/v1"])
+
+
+if __name__ == "__main__":
+    unittest.main()

app/tests/test_ytdl_utils.py

@@ -2,18 +2,53 @@
 
 from __future__ import annotations
 
+import pickle
+import sys
 import tempfile
+import threading
+import types
 import unittest
 from pathlib import Path
 
+fake_yt_dlp = types.ModuleType("yt_dlp")
+fake_networking = types.ModuleType("yt_dlp.networking")
+fake_impersonate = types.ModuleType("yt_dlp.networking.impersonate")
+fake_utils = types.ModuleType("yt_dlp.utils")
+
+
+class _ImpersonateTarget:
+    @staticmethod
+    def from_str(value):
+        return value
+
+
+fake_impersonate.ImpersonateTarget = _ImpersonateTarget
+fake_networking.impersonate = fake_impersonate
+# The inner ``key`` group mirrors the real ``STR_FORMAT_RE_TMPL`` so that
+# ``_OUTTMPL_FIELD_RE`` (compiled at import time) has the named group that
+# ``_resolve_outtmpl_fields`` reads via ``match.group('key')``.
+fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>(?P<key>{}))\)(?P<format>[-0-9.]*{})"
+fake_utils.STR_FORMAT_TYPES = "diouxXeEfFgGcrsa"
+fake_yt_dlp.networking = fake_networking
+fake_yt_dlp.utils = fake_utils
+sys.modules.setdefault("yt_dlp", fake_yt_dlp)
+sys.modules.setdefault("yt_dlp.networking", fake_networking)
+sys.modules.setdefault("yt_dlp.networking.impersonate", fake_impersonate)
+sys.modules.setdefault("yt_dlp.utils", fake_utils)
+
 from ytdl import (
     DownloadInfo,
-    _convert_generators_to_lists,
+    _compact_persisted_entry,
     _convert_srt_to_txt_file,
-    _outtmpl_substitute_field,
+    _resolve_outtmpl_fields,
+    _sanitize_entry_for_pickle,
     _sanitize_path_component,
 )
 
+# Detect whether the real yt-dlp is loaded (as opposed to the minimal fake
+# shim above).  _resolve_outtmpl_fields needs YoutubeDL at runtime.
+_has_real_ytdlp = hasattr(sys.modules.get("yt_dlp"), "YoutubeDL")
+
 
 class SanitizePathComponentTests(unittest.TestCase):
     def test_replaces_windows_invalid_chars(self):
@@ -24,28 +59,105 @@ class SanitizePathComponentTests(unittest.TestCase):
         self.assertEqual(_sanitize_path_component(42), 42)
 
 
-class OuttmplSubstituteFieldTests(unittest.TestCase):
-    def test_simple_substitution(self):
-        self.assertEqual(_outtmpl_substitute_field("%(title)s", "title", "Hello"), "Hello")
+@unittest.skipUnless(_has_real_ytdlp, "requires real yt-dlp")
+class ResolveOuttmplFieldsTests(unittest.TestCase):
+    """Tests for _resolve_outtmpl_fields (delegates to yt-dlp's template engine)."""
+
+    def test_simple_playlist_substitution(self):
+        info = {"playlist_title": "My PL", "playlist_index": "03"}
+        result = _resolve_outtmpl_fields("%(playlist_title)s/%(title)s.%(ext)s", info, ("playlist",))
+        self.assertEqual(result, "My PL/%(title)s.%(ext)s")
 
     def test_format_spec_int(self):
-        self.assertEqual(_outtmpl_substitute_field("%(idx)02d", "idx", 3), "03")
+        info = {"playlist_index": "3"}
+        result = _resolve_outtmpl_fields("%(playlist_index)02d-%(title)s", info, ("playlist",))
+        self.assertEqual(result, "03-%(title)s")
 
-    def test_missing_field_unchanged(self):
-        self.assertEqual(_outtmpl_substitute_field("%(other)s", "title", "x"), "%(other)s")
+    def test_non_targeted_fields_unchanged(self):
+        info = {"playlist_title": "PL"}
+        result = _resolve_outtmpl_fields("%(title)s/%(ext)s", info, ("playlist",))
+        self.assertEqual(result, "%(title)s/%(ext)s")
+
+    def test_default_value(self):
+        info = {"playlist_index": "1"}
+        result = _resolve_outtmpl_fields("%(playlist_title|Unknown)s/%(playlist_index)s", info, ("playlist",))
+        self.assertEqual(result, "Unknown/1")
+
+    def test_channel_prefix(self):
+        info = {"channel": "MyChan", "channel_index": "05"}
+        result = _resolve_outtmpl_fields("%(channel)s/%(channel_index)02d-%(title)s", info, ("channel",))
+        self.assertEqual(result, "MyChan/05-%(title)s")
+
+    def test_math_operation(self):
+        info = {"playlist_index": "3"}
+        result = _resolve_outtmpl_fields("%(playlist_index+100)d", info, ("playlist",))
+        self.assertEqual(result, "103")
+
+    def test_playlist_count_and_autonumber(self):
+        info = {
+            "playlist_title": "My PL",
+            "playlist_index": "03",
+            "playlist_count": 10,
+            "playlist_autonumber": 3,
+            "n_entries": 10,
+            "__last_playlist_index": 10,
+        }
+        result = _resolve_outtmpl_fields(
+            "%(playlist_title)s/%(playlist_autonumber)s of %(playlist_count)s - %(title)s.%(ext)s",
+            info,
+            ("playlist",),
+        )
+        # playlist_autonumber is auto-padded by yt-dlp using __last_playlist_index
+        self.assertEqual(result, "My PL/03 of 10 - %(title)s.%(ext)s")
+
+    def test_conditional_playlist_index(self):
+        info = {
+            "playlist_index": "5",
+            "playlist_count": 10,
+        }
+        result = _resolve_outtmpl_fields(
+            "%(playlist_index&{} - |)s%(title)s.%(ext)s",
+            info,
+            ("playlist",),
+        )
+        self.assertEqual(result, "5 - %(title)s.%(ext)s")
 
 
-class ConvertGeneratorsToListsTests(unittest.TestCase):
+class SanitizeEntryForPickleTests(unittest.TestCase):
     def test_nested(self):
         def g():
             yield 1
 
         obj = {"a": g(), "b": [g()]}
-        out = _convert_generators_to_lists(obj)
+        out = _sanitize_entry_for_pickle(obj)
         self.assertEqual(out, {"a": [1], "b": [[1]]})
+        pickle.dumps(out)
 
     def test_plain(self):
-        self.assertEqual(_convert_generators_to_lists(5), 5)
+        self.assertEqual(_sanitize_entry_for_pickle(5), 5)
+
+    def test_set_converted_to_list(self):
+        obj = {"s": {1, 2}}
+        out = _sanitize_entry_for_pickle(obj)
+        self.assertEqual(sorted(out["s"]), [1, 2])
+        pickle.dumps(out)
+
+    def test_map_iterator(self):
+        out = _sanitize_entry_for_pickle({"m": map(int, ["1", "2"])})
+        self.assertEqual(out, {"m": [1, 2]})
+
+    def test_lock_replaced_with_none(self):
+        lock = threading.Lock()
+        out = _sanitize_entry_for_pickle({"k": lock})
+        self.assertIsNone(out["k"])
+        pickle.dumps(out)
+
+    def test_ordered_dict(self):
+        from collections import OrderedDict
+
+        od = OrderedDict([("z", 1), ("a", 2)])
+        out = _sanitize_entry_for_pickle(od)
+        self.assertEqual(out, {"z": 1, "a": 2})
 
 
 class ConvertSrtToTxtTests(unittest.TestCase):
@@ -141,6 +253,61 @@ class DownloadInfoSetstateTests(unittest.TestCase):
         di.__setstate__(state)
         self.assertEqual(di.subtitle_files, [])
 
+    def test_missing_optional_fields_are_defaulted(self):
+        state = self._base_state(
+            download_type="video",
+            codec="auto",
+            format="any",
+            quality="best",
+        )
+        state.pop("folder")
+        state.pop("custom_name_prefix")
+        state.pop("playlist_item_limit")
+        state.pop("split_by_chapters")
+        state.pop("chapter_template")
+        di = DownloadInfo.__new__(DownloadInfo)
+        di.__setstate__(state)
+        self.assertEqual(di.folder, "")
+        self.assertEqual(di.custom_name_prefix, "")
+        self.assertEqual(di.playlist_item_limit, 0)
+        self.assertFalse(di.split_by_chapters)
+        self.assertEqual(di.chapter_template, "")
+
+
+class CompactPersistedEntryTests(unittest.TestCase):
+    def test_keeps_only_playlist_and_channel_keys(self):
+        entry = {
+            "playlist_index": "01",
+            "playlist_title": "Playlist",
+            "playlist_count": 10,
+            "playlist_autonumber": 1,
+            "channel_index": "02",
+            "channel_title": "Channel",
+            "n_entries": 10,
+            "__last_playlist_index": 10,
+            "formats": [{"id": "huge"}],
+            "description": "big blob",
+        }
+
+        compact = _compact_persisted_entry(entry)
+
+        self.assertEqual(
+            compact,
+            {
+                "playlist_index": "01",
+                "playlist_title": "Playlist",
+                "playlist_count": 10,
+                "playlist_autonumber": 1,
+                "channel_index": "02",
+                "channel_title": "Channel",
+                "n_entries": 10,
+                "__last_playlist_index": 10,
+            },
+        )
+
+    def test_returns_none_when_no_restart_relevant_keys_exist(self):
+        self.assertIsNone(_compact_persisted_entry({"id": "x", "title": "y"}))
+
 
 if __name__ == "__main__":
     unittest.main()

app/ytdl.py

@@ -1,34 +1,28 @@
 import os
 import shutil
 import yt_dlp
+import collections
+import collections.abc
+import copy
+import pickle
 from collections import OrderedDict
-import shelve
 import time
 import asyncio
 import multiprocessing
 import logging
 import re
 import types
-import dbm
-import subprocess
-from typing import Any
-from functools import lru_cache
+from typing import Any, Optional
 
 import yt_dlp.networking.impersonate
 from yt_dlp.utils import STR_FORMAT_RE_TMPL, STR_FORMAT_TYPES
 from dl_formats import get_format, get_opts, AUDIO_FORMATS
 from datetime import datetime
+from state_store import AtomicJsonStore, from_json_compatible, read_legacy_shelf, to_json_compatible
 
 log = logging.getLogger('ytdl')
 
 
-@lru_cache(maxsize=None)
-def _compile_outtmpl_pattern(field: str) -> re.Pattern:
-    """Compile a regex pattern to match a specific field in an output template, including optional format specifiers."""
-    conversion_types = f"[{re.escape(STR_FORMAT_TYPES)}]"
-    return re.compile(STR_FORMAT_RE_TMPL.format(re.escape(field), conversion_types))
-
-
 # Characters that are invalid in Windows/NTFS path components. These are pre-
 # sanitised when substituting playlist/channel titles into output templates so
 # that downloads do not fail on NTFS-mounted volumes or Windows Docker hosts.
@@ -39,55 +33,86 @@ def _sanitize_path_component(value: Any) -> Any:
     """Replace characters that are invalid in Windows path components with '_'.
 
     Non-string values (int, float, None, …) are passed through unchanged so
-    that ``_outtmpl_substitute_field`` can still coerce them with format specs
-    (e.g. ``%(playlist_index)02d``).  Only string values are sanitised because
-    Windows-invalid characters are only a concern for human-readable strings
-    (titles, channel names, etc.) that may end up as directory names.
+    that numeric format specs (e.g. ``%(playlist_index)02d``) still work.
+    Only string values are sanitised because Windows-invalid characters are
+    only a concern for human-readable strings (titles, channel names, etc.)
+    that may end up as directory names.
     """
     if not isinstance(value, str):
         return value
     return _WINDOWS_INVALID_PATH_CHARS.sub('_', value)
 
 
-def _outtmpl_substitute_field(template: str, field: str, value: Any) -> str:
-    """Substitute a single field in an output template, applying any format specifiers to the value."""
-    pattern = _compile_outtmpl_pattern(field)
+# Regex matching yt-dlp output-template field references, e.g. ``%(title)s``
+# or ``%(playlist_index)03d``.  Built from yt-dlp's own ``STR_FORMAT_RE_TMPL``
+# so that it stays in sync with upstream changes to the template syntax.
+_OUTTMPL_FIELD_RE = re.compile(
+    STR_FORMAT_RE_TMPL.format('[^)]+', f'[{STR_FORMAT_TYPES}ljhqBUDS]')
+)
 
-    def replacement(match: re.Match) -> str:
-        if match.group("has_key") is None:
-            return match.group(0)
 
-        prefix = match.group("prefix") or ""
-        format_spec = match.group("format")
+def _resolve_outtmpl_fields(template: str, info_dict: dict, prefixes: tuple[str, ...]) -> str:
+    """Resolve specific fields in an output template using yt-dlp's template engine.
 
-        if not format_spec:
-            return f"{prefix}{value}"
+    Only field references whose root name starts with one of *prefixes* are
+    evaluated.  All other references are left untouched so that yt-dlp can
+    resolve them later during the actual download.
 
-        conversion_type = format_spec[-1]
-        try:
-            if conversion_type in "diouxX":
-                coerced_value = int(value)
-            elif conversion_type in "eEfFgG":
-                coerced_value = float(value)
-            else:
-                coerced_value = value
+    This delegates to ``YoutubeDL.evaluate_outtmpl`` for each targeted field
+    reference, giving access to the full yt-dlp template syntax (defaults,
+    conditional formatting, math operations, datetime formatting, etc.).
+    """
+    matches = list(_OUTTMPL_FIELD_RE.finditer(template))
+    if not matches:
+        return template
 
-            return f"{prefix}{('%' + format_spec) % coerced_value}"
-        except (ValueError, TypeError):
-            return f"{prefix}{value}"
+    with yt_dlp.YoutubeDL({'quiet': True}) as ydl:
+        for match in reversed(matches):
+            key = match.group('key')
+            if key is None:
+                continue
+            root = re.match(r'\w+', key)
+            if root is None or not root.group(0).startswith(prefixes):
+                continue
+            resolved = ydl.evaluate_outtmpl(match.group(0), info_dict)
+            template = template[:match.start()] + resolved + template[match.end():]
 
-    return pattern.sub(replacement, template)
+    return template
 
-def _convert_generators_to_lists(obj):
-    """Recursively convert generators to lists in a dictionary to make it pickleable."""
-    if isinstance(obj, types.GeneratorType):
-        return list(obj)
-    elif isinstance(obj, dict):
-        return {k: _convert_generators_to_lists(v) for k, v in obj.items()}
-    elif isinstance(obj, (list, tuple)):
-        return type(obj)(_convert_generators_to_lists(item) for item in obj)
-    else:
+_MAX_ENTRY_SANITIZE_DEPTH = 64
+
+
+def _sanitize_entry_for_pickle(obj, _depth=0):
+    """Recursively normalize yt-dlp ``info_dict`` data so it can be stored in shelve/pickle.
+
+    Live streams and newer yt-dlp versions may nest generators, iterators, sets, or
+    non-serializable objects (e.g. locks) inside the extracted metadata. The previous
+    helper only walked plain dict/list/tuple and only expanded ``types.GeneratorType``.
+    """
+    if _depth > _MAX_ENTRY_SANITIZE_DEPTH:
+        return None
+    if obj is None or isinstance(obj, (bool, int, float, str, bytes)):
         return obj
+    if isinstance(obj, types.GeneratorType):
+        return _sanitize_entry_for_pickle(list(obj), _depth + 1)
+    if isinstance(obj, collections.abc.Mapping):
+        return {k: _sanitize_entry_for_pickle(v, _depth + 1) for k, v in obj.items()}
+    if isinstance(obj, (list, tuple)):
+        return type(obj)(_sanitize_entry_for_pickle(x, _depth + 1) for x in obj)
+    if isinstance(obj, (set, frozenset)):
+        return [_sanitize_entry_for_pickle(x, _depth + 1) for x in obj]
+    if isinstance(obj, collections.deque):
+        return [_sanitize_entry_for_pickle(x, _depth + 1) for x in obj]
+    if isinstance(obj, collections.abc.Iterator):
+        try:
+            return _sanitize_entry_for_pickle(list(obj), _depth + 1)
+        except Exception:
+            return None
+    try:
+        pickle.dumps(obj, protocol=pickle.HIGHEST_PROTOCOL)
+        return obj
+    except Exception:
+        return None
 
 
 def _convert_srt_to_txt_file(subtitle_path: str):
@@ -178,8 +203,8 @@ class DownloadInfo:
         self.size = None
         self.timestamp = time.time_ns()
         self.error = error
-        # Convert generators to lists to make entry pickleable
-        self.entry = _convert_generators_to_lists(entry) if entry is not None else None
+        # Strip non-pickleable values (generators, iterators, locks, etc.) for shelve
+        self.entry = _sanitize_entry_for_pickle(entry) if entry is not None else None
         self.playlist_item_limit = playlist_item_limit
         self.split_by_chapters = split_by_chapters
         self.chapter_template = chapter_template
@@ -223,8 +248,103 @@ class DownloadInfo:
 
         if not getattr(self, "codec", None):
             self.codec = "auto"
+        if not hasattr(self, "folder"):
+            self.folder = ""
+        if not hasattr(self, "custom_name_prefix"):
+            self.custom_name_prefix = ""
+        if not hasattr(self, "playlist_item_limit"):
+            self.playlist_item_limit = 0
+        if not hasattr(self, "split_by_chapters"):
+            self.split_by_chapters = False
+        if not hasattr(self, "chapter_template"):
+            self.chapter_template = ""
+        if not hasattr(self, "subtitle_language"):
+            self.subtitle_language = "en"
+        if not hasattr(self, "subtitle_mode"):
+            self.subtitle_mode = "prefer_manual"
+        if not hasattr(self, "entry"):
+            self.entry = None
         if not hasattr(self, "subtitle_files"):
             self.subtitle_files = []
+        if not hasattr(self, "chapter_files"):
+            self.chapter_files = []
+
+
+_PERSISTED_DOWNLOAD_FIELDS = (
+    "id",
+    "title",
+    "url",
+    "quality",
+    "download_type",
+    "codec",
+    "format",
+    "folder",
+    "custom_name_prefix",
+    "playlist_item_limit",
+    "split_by_chapters",
+    "chapter_template",
+    "subtitle_language",
+    "subtitle_mode",
+    "status",
+    "timestamp",
+    "error",
+    "msg",
+    "filename",
+    "size",
+    "chapter_files",
+)
+
+
+_COMPACT_ENTRY_EXTRA_KEYS = frozenset(("n_entries", "__last_playlist_index"))
+
+
+def _compact_persisted_entry(entry: Any) -> Optional[dict[str, Any]]:
+    if not isinstance(entry, dict):
+        return None
+    compact = {
+        key: value
+        for key, value in entry.items()
+        if key.startswith("playlist") or key.startswith("channel") or key in _COMPACT_ENTRY_EXTRA_KEYS
+    }
+    return compact or None
+
+
+def _download_info_to_record(
+    info: DownloadInfo,
+    *,
+    include_entry: bool,
+) -> dict[str, Any]:
+    record: dict[str, Any] = {}
+    for key in _PERSISTED_DOWNLOAD_FIELDS:
+        if hasattr(info, key):
+            value = getattr(info, key)
+            if value is not None:
+                record[key] = to_json_compatible(value)
+    if include_entry:
+        compact_entry = _compact_persisted_entry(getattr(info, "entry", None))
+        if compact_entry is not None:
+            record["entry"] = to_json_compatible(compact_entry)
+    return record
+
+
+def _download_info_from_record(record: dict[str, Any]) -> DownloadInfo:
+    info = DownloadInfo.__new__(DownloadInfo)
+    info.__setstate__({key: from_json_compatible(value) for key, value in record.items()})
+    if not hasattr(info, "msg"):
+        info.msg = None
+    if not hasattr(info, "percent"):
+        info.percent = None
+    if not hasattr(info, "speed"):
+        info.speed = None
+    if not hasattr(info, "eta"):
+        info.eta = None
+    if not hasattr(info, "status"):
+        info.status = "pending"
+    if not hasattr(info, "size"):
+        info.size = None
+    if not hasattr(info, "error"):
+        info.error = None
+    return info
 
 class Download:
     manager = None
@@ -475,11 +595,9 @@ class PersistentQueue:
         pdir = os.path.dirname(path)
         if not os.path.isdir(pdir):
             os.mkdir(pdir)
-        with shelve.open(path, 'c'):
-            pass
-
-        self.path = path
-        self.repair()
+        self.legacy_path = path
+        self.path = f"{path}.json"
+        self.store = AtomicJsonStore(self.path, kind=f"persistent_queue:{name}")
         self.dict = OrderedDict()
 
     def load(self):
@@ -496,20 +614,91 @@ class PersistentQueue:
         return self.dict.items()
 
     def saved_items(self):
-        with shelve.open(self.path, 'r') as shelf:
-            return sorted(shelf.items(), key=lambda item: item[1].timestamp)
+        items = [
+            (item["key"], _download_info_from_record(item["info"]))
+            for item in self._load_state_items()
+        ]
+        return sorted(items, key=lambda item: item[1].timestamp)
+
+    def _should_persist_entry(self) -> bool:
+        return self.identifier != "completed"
+
+    def _serialize_items(self):
+        return [
+            {
+                "key": key,
+                "info": _download_info_to_record(
+                    download.info,
+                    include_entry=self._should_persist_entry(),
+                ),
+            }
+            for key, download in self.dict.items()
+        ]
+
+    def _save_dict(self):
+        self.store.save({"items": self._serialize_items()})
+
+    def _load_state_items(self):
+        payload = self.store.load()
+        if payload is not None:
+            items = payload.get("items")
+            if isinstance(items, list):
+                compact_items = [
+                    {
+                        "key": item["key"],
+                        "info": _download_info_to_record(
+                            _download_info_from_record(item["info"]),
+                            include_entry=self._should_persist_entry(),
+                        ),
+                    }
+                    for item in items
+                    if isinstance(item, dict) and "key" in item and "info" in item
+                ]
+                if payload.get("schema_version") != self.store.schema_version or compact_items != items:
+                    self.store.save({"items": compact_items})
+                return compact_items
+            log.warning("PersistentQueue:%s state file did not contain an items list", self.identifier)
+            return []
+
+        legacy_items = read_legacy_shelf(self.legacy_path)
+        if legacy_items is None:
+            return []
+
+        items = [
+            {
+                "key": key,
+                "info": _download_info_to_record(
+                    value,
+                    include_entry=self._should_persist_entry(),
+                ),
+            }
+            for key, value in sorted(legacy_items, key=lambda item: item[1].timestamp)
+        ]
+        self.store.save({"items": items})
+        return items
 
     def put(self, value):
         key = value.info.url
+        old = self.dict.get(key)
         self.dict[key] = value
-        with shelve.open(self.path, 'w') as shelf:
-            shelf[key] = value.info
+        try:
+            self._save_dict()
+        except Exception:
+            if old is None:
+                del self.dict[key]
+            else:
+                self.dict[key] = old
+            raise
 
     def delete(self, key):
         if key in self.dict:
+            old = self.dict[key]
             del self.dict[key]
-            with shelve.open(self.path, 'w') as shelf:
-                shelf.pop(key, None)
+            try:
+                self._save_dict()
+            except Exception:
+                self.dict[key] = old
+                raise
 
     def next(self):
         k, v = next(iter(self.dict.items()))
@@ -518,90 +707,6 @@ class PersistentQueue:
     def empty(self):
         return not bool(self.dict)
 
-    def repair(self):
-        # check DB format
-        type_check = subprocess.run(
-            ["file", self.path],
-            capture_output=True,
-            text=True
-        )
-        db_type = type_check.stdout.lower()
-
-        # create backup (<queue>.old)
-        try:
-            shutil.copy2(self.path, f"{self.path}.old")
-        except Exception as e:
-            # if we cannot backup then its not safe to attempt a repair
-            #  since it could be due to a filesystem error
-            log.debug(f"PersistentQueue:{self.identifier} backup failed, skipping repair")
-            return
-
-        if "gnu dbm" in db_type:
-            # perform gdbm repair
-            log_prefix = f"PersistentQueue:{self.identifier} repair (dbm/file)"
-            log.debug(f"{log_prefix} started")
-            try:
-                result = subprocess.run(
-                    ["gdbmtool", self.path],
-                    input="recover verbose summary\n",
-                    text=True,
-                    capture_output=True,
-                    timeout=60
-                )
-                log.debug(f"{log_prefix} {result.stdout}")
-                if result.stderr:
-                    log.debug(f"{log_prefix} failed: {result.stderr}")
-            except FileNotFoundError:
-                log.debug(f"{log_prefix} failed: 'gdbmtool' was not found")
-
-            # perform null key cleanup
-            log_prefix = f"PersistentQueue:{self.identifier} repair (null keys)"
-            log.debug(f"{log_prefix} started")
-            deleted = 0
-            try:
-                with dbm.open(self.path, "w") as db:
-                    for key in list(db.keys()):
-                        if len(key) > 0 and all(b == 0x00 for b in key):
-                            log.debug(f"{log_prefix} deleting key of length {len(key)} (all NUL bytes)")
-                            del db[key]
-                            deleted += 1
-                log.debug(f"{log_prefix} done - deleted {deleted} key(s)")
-            except dbm.error:
-                log.debug(f"{log_prefix} failed: db type is dbm.gnu, but the module is not available (dbm.error; module support may be missing or the file may be corrupted)")
-
-        elif "sqlite" in db_type:
-            # perform sqlite3 recovery
-            log_prefix = f"PersistentQueue:{self.identifier} repair (sqlite3/file)"
-            log.debug(f"{log_prefix} started")
-            try:
-                recover_proc = subprocess.Popen(
-                    ["sqlite3", self.path, ".recover"],
-                    stdout=subprocess.PIPE,
-                    stderr=subprocess.PIPE,
-                    text=True,
-                )
-                run_result = subprocess.run(
-                    ["sqlite3", f"{self.path}.tmp"],
-                    stdin=recover_proc.stdout,
-                    capture_output=True,
-                    text=True,
-                    timeout=60,
-                )
-                if recover_proc.stdout is not None:
-                    recover_proc.stdout.close()
-                recover_stderr = recover_proc.stderr.read() if recover_proc.stderr is not None else ""
-                recover_proc.wait(timeout=60)
-                if run_result.stderr or recover_stderr:
-                    error_text = " ".join(part for part in [recover_stderr.strip(), run_result.stderr.strip()] if part)
-                    log.debug(f"{log_prefix} failed: {error_text}")
-                else:
-                    shutil.move(f"{self.path}.tmp", self.path)
-                    log.debug(f"{log_prefix}{run_result.stdout or ' was successful, no output'}")
-            except FileNotFoundError:
-                log.debug(f"{log_prefix} failed: 'sqlite3' was not found")
-            except subprocess.TimeoutExpired:
-                log.debug(f"{log_prefix} failed: sqlite recovery timed out")
-
 class DownloadQueue:
     def __init__(self, config, notifier):
         self.config = config
@@ -715,15 +820,13 @@ class DownloadQueue:
         if entry is not None and entry.get('playlist_index') is not None:
             if len(self.config.OUTPUT_TEMPLATE_PLAYLIST):
                 output = self.config.OUTPUT_TEMPLATE_PLAYLIST
-            for property, value in entry.items():
-                if property.startswith("playlist"):
-                    output = _outtmpl_substitute_field(output, property, _sanitize_path_component(value))
+            sanitized = {k: _sanitize_path_component(v) for k, v in entry.items()}
+            output = _resolve_outtmpl_fields(output, sanitized, ('playlist',))
         if entry is not None and entry.get('channel_index') is not None:
             if len(self.config.OUTPUT_TEMPLATE_CHANNEL):
                 output = self.config.OUTPUT_TEMPLATE_CHANNEL
-            for property, value in entry.items():
-                if property.startswith("channel"):
-                    output = _outtmpl_substitute_field(output, property, _sanitize_path_component(value))
+            sanitized = {k: _sanitize_path_component(v) for k, v in entry.items()}
+            output = _resolve_outtmpl_fields(output, sanitized, ('channel',))
         ytdl_options = dict(self.config.YTDL_OPTIONS)
         playlist_item_limit = getattr(dl, 'playlist_item_limit', 0)
         if playlist_item_limit > 0:
@@ -793,8 +896,9 @@ class DownloadQueue:
             # Convert generator to list if needed (for len() and slicing operations)
             if isinstance(entries, types.GeneratorType):
                 entries = list(entries)
-            log.info(f'{etype} detected with {len(entries)} entries')
-            index_digits = len(str(len(entries)))
+            total_entries = len(entries)
+            log.info(f'{etype} detected with {total_entries} entries')
+            index_digits = len(str(total_entries))
             results = []
             if playlist_item_limit > 0:
                 log.info(f'Item limit is set. Processing only first {playlist_item_limit} entries')
@@ -806,6 +910,12 @@ class DownloadQueue:
                 etr["_type"] = "video"
                 etr[etype] = entry.get("id") or entry.get("channel_id") or entry.get("channel")
                 etr[f"{etype}_index"] = '{{0:0{0:d}d}}'.format(index_digits).format(index)
+                etr[f"{etype}_count"] = total_entries
+                etr[f"{etype}_autonumber"] = index
+                # n_entries: standard yt-dlp field for total count (used by template engine)
+                # __last_playlist_index: yt-dlp internal field for auto-padding autonumber
+                etr["n_entries"] = total_entries
+                etr["__last_playlist_index"] = total_entries
                 for property in ("id", "title", "uploader", "uploader_id"):
                     if property in entry:
                         etr[f"{etype}_{property}"] = entry[property]
@@ -914,6 +1024,42 @@ class DownloadQueue:
             _add_gen,
         )
 
+    async def add_entry(
+        self,
+        entry,
+        download_type,
+        codec,
+        format,
+        quality,
+        folder,
+        custom_name_prefix,
+        playlist_item_limit,
+        auto_start=True,
+        split_by_chapters=False,
+        chapter_template=None,
+        subtitle_language="en",
+        subtitle_mode="prefer_manual",
+    ):
+        normalized_entry = copy.deepcopy(entry) if isinstance(entry, dict) else entry
+        already = set()
+        return await self.__add_entry(
+            normalized_entry,
+            download_type,
+            codec,
+            format,
+            quality,
+            folder,
+            custom_name_prefix,
+            playlist_item_limit,
+            auto_start,
+            split_by_chapters,
+            chapter_template,
+            subtitle_language,
+            subtitle_mode,
+            already,
+            None,
+        )
+
     async def start_pending(self, ids):
         for id in ids:
             if not self.pending.exists(id):

ui/package.json

@@ -23,21 +23,21 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^21.2.5",
-    "@angular/common": "^21.2.5",
-    "@angular/compiler": "^21.2.5",
-    "@angular/core": "^21.2.5",
-    "@angular/forms": "^21.2.5",
-    "@angular/platform-browser": "^21.2.5",
-    "@angular/platform-browser-dynamic": "^21.2.5",
-    "@angular/service-worker": "^21.2.5",
+    "@angular/animations": "^21.2.6",
+    "@angular/common": "^21.2.6",
+    "@angular/compiler": "^21.2.6",
+    "@angular/core": "^21.2.6",
+    "@angular/forms": "^21.2.6",
+    "@angular/platform-browser": "^21.2.6",
+    "@angular/platform-browser-dynamic": "^21.2.6",
+    "@angular/service-worker": "^21.2.6",
     "@fortawesome/angular-fontawesome": "~4.0.0",
     "@fortawesome/fontawesome-svg-core": "^7.2.0",
     "@fortawesome/free-brands-svg-icons": "^7.2.0",
     "@fortawesome/free-regular-svg-icons": "^7.2.0",
     "@fortawesome/free-solid-svg-icons": "^7.2.0",
     "@ng-bootstrap/ng-bootstrap": "^20.0.0",
-    "@ng-select/ng-select": "^21.5.2",
+    "@ng-select/ng-select": "^21.7.0",
     "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.8",
     "ngx-cookie-service": "^21.3.1",
@@ -48,16 +48,16 @@
   },
   "devDependencies": {
     "@angular-eslint/builder": "21.1.0",
-    "@angular/build": "^21.2.3",
-    "@angular/cli": "^21.2.3",
-    "@angular/compiler-cli": "^21.2.5",
-    "@angular/localize": "^21.2.5",
+    "@angular/build": "^21.2.5",
+    "@angular/cli": "^21.2.5",
+    "@angular/compiler-cli": "^21.2.6",
+    "@angular/localize": "^21.2.6",
     "@eslint/js": "^9.39.4",
     "angular-eslint": "21.1.0",
     "eslint": "^9.39.4",
     "jsdom": "^27.4.0",
     "typescript": "~5.9.3",
     "typescript-eslint": "8.47.0",
-    "vitest": "^4.1.0"
+    "vitest": "^4.1.2"
   }
 }

ui/src/app/app.html

@@ -89,15 +89,7 @@
       <!-- Main URL Input with Download Button -->
       <div class="row mb-4">
         <div class="col">
-          <div class="input-group input-group-lg shadow-sm">
-            <input type="text"
-              autocomplete="off"
-              spellcheck="false"
-              class="form-control form-control-lg"
-              placeholder="Enter video, channel, or playlist URL"
-              name="addUrl"
-              [(ngModel)]="addUrl"
-              [disabled]="addInProgress || downloads.loading">
+          <ng-template #urlBarActions>
             @if (addInProgress && cancelRequested) {
               <button class="btn btn-warning btn-lg px-3" type="button" disabled>
                 <span class="spinner-border spinner-border-sm me-1" role="status"></span>
@@ -115,13 +107,54 @@
                 title="Cancel adding URL">
                 <fa-icon [icon]="faTimesCircle" class="me-1" /> Cancel
               </button>
+            } @else if (subscribeInProgress) {
+              <button class="btn btn-primary btn-lg px-4" type="button" disabled>
+                Download
+              </button>
+              <button class="btn btn-outline-secondary btn-lg px-3" type="button" disabled>
+                <span class="spinner-border spinner-border-sm me-2" role="status"></span>
+                Subscribing...
+              </button>
             } @else {
               <button class="btn btn-primary btn-lg px-4" type="submit"
                 (click)="addDownload()"
                 [disabled]="downloads.loading">
                 Download
               </button>
+              <button class="btn btn-outline-secondary btn-lg px-3" type="button"
+                (click)="addSubscription()"
+                [disabled]="downloads.loading">
+                Subscribe
+              </button>
             }
+          </ng-template>
+
+          <!-- Narrow viewports: full-width field, then Bootstrap btn-group (no faux input-group strip) -->
+          <div class="vstack gap-2 d-md-none">
+            <input type="text"
+              autocomplete="off"
+              spellcheck="false"
+              class="form-control form-control-lg"
+              placeholder="Enter video, channel, or playlist URL"
+              [(ngModel)]="addUrl"
+              [ngModelOptions]="{standalone: true}"
+              [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+            <div class="btn-group w-100" role="group" aria-label="Download or subscribe">
+              <ng-container [ngTemplateOutlet]="urlBarActions" />
+            </div>
+          </div>
+
+          <!-- md and up: standard input-group so Bootstrap handles fused borders -->
+          <div class="input-group input-group-lg shadow-sm d-none d-md-flex">
+            <input type="text"
+              autocomplete="off"
+              spellcheck="false"
+              class="form-control form-control-lg"
+              placeholder="Enter video, channel, or playlist URL"
+              [(ngModel)]="addUrl"
+              [ngModelOptions]="{standalone: true}"
+              [disabled]="addInProgress || subscribeInProgress || downloads.loading">
+            <ng-container [ngTemplateOutlet]="urlBarActions" />
           </div>
         </div>
       </div>
@@ -136,7 +169,7 @@
                 name="downloadType"
                 [(ngModel)]="downloadType"
                 (change)="downloadTypeChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (type of downloadTypes; track type.id) {
                   <option [ngValue]="type.id">{{ type.text }}</option>
                 }
@@ -150,7 +183,7 @@
                 name="codec"
                 [(ngModel)]="codec"
                 (change)="codecChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (vc of videoCodecs; track vc.id) {
                   <option [ngValue]="vc.id">{{ vc.text }}</option>
                 }
@@ -164,7 +197,7 @@
                 name="format"
                 [(ngModel)]="format"
                 (change)="formatChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (f of formatOptions; track f.id) {
                   <option [ngValue]="f.id">{{ f.text }}</option>
                 }
@@ -178,7 +211,7 @@
                 name="quality"
                 [(ngModel)]="quality"
                 (change)="qualityChanged()"
-                [disabled]="addInProgress || downloads.loading || !showQualitySelector()">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading || !showQualitySelector()">
                 @for (q of qualities; track q.id) {
                   <option [ngValue]="q.id">{{ q.text }}</option>
                 }
@@ -193,7 +226,7 @@
                 name="downloadType"
                 [(ngModel)]="downloadType"
                 (change)="downloadTypeChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (type of downloadTypes; track type.id) {
                   <option [ngValue]="type.id">{{ type.text }}</option>
                 }
@@ -207,7 +240,7 @@
                 name="format"
                 [(ngModel)]="format"
                 (change)="formatChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (f of formatOptions; track f.id) {
                   <option [ngValue]="f.id">{{ f.text }}</option>
                 }
@@ -221,7 +254,7 @@
                 name="quality"
                 [(ngModel)]="quality"
                 (change)="qualityChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (q of qualities; track q.id) {
                   <option [ngValue]="q.id">{{ q.text }}</option>
                 }
@@ -229,28 +262,29 @@
             </div>
           </div>
         } @else if (downloadType === 'captions') {
-          <div class="col-md-3">
+          <!-- 4× col-md-3 is too tight at ~768px (long addons wrap the 4th field); 2×2 md–lg, one row lg+ -->
+          <div class="col-12 col-md-6 col-lg-3">
             <div class="input-group">
               <span class="input-group-text">Type</span>
               <select class="form-select"
                 name="downloadType"
                 [(ngModel)]="downloadType"
                 (change)="downloadTypeChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (type of downloadTypes; track type.id) {
                   <option [ngValue]="type.id">{{ type.text }}</option>
                 }
               </select>
             </div>
           </div>
-          <div class="col-md-3">
+          <div class="col-12 col-md-6 col-lg-3">
             <div class="input-group">
               <span class="input-group-text">Format</span>
               <select class="form-select"
                 name="format"
                 [(ngModel)]="format"
                 (change)="formatChanged()"
-                [disabled]="addInProgress || downloads.loading"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                 ngbTooltip="Subtitle output format for captions mode">
                 @for (f of formatOptions; track f.id) {
                   <option [ngValue]="f.id">{{ f.text }}</option>
@@ -258,7 +292,7 @@
               </select>
             </div>
           </div>
-          <div class="col-md-3">
+          <div class="col-12 col-md-6 col-lg-3">
             <div class="input-group">
               <span class="input-group-text">Language</span>
               <input class="form-control"
@@ -267,7 +301,7 @@
                 name="subtitleLanguage"
                 [(ngModel)]="subtitleLanguage"
                 (change)="subtitleLanguageChanged()"
-                [disabled]="addInProgress || downloads.loading"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                 placeholder="e.g. en, es, zh-Hans"
                 ngbTooltip="Subtitle language (you can type any language code)">
               <datalist id="subtitleLanguageOptions">
@@ -277,14 +311,14 @@
               </datalist>
             </div>
           </div>
-          <div class="col-md-3">
+          <div class="col-12 col-md-6 col-lg-3">
             <div class="input-group">
               <span class="input-group-text">Subtitle Source</span>
               <select class="form-select"
                 name="subtitleMode"
                 [(ngModel)]="subtitleMode"
                 (change)="subtitleModeChanged()"
-                [disabled]="addInProgress || downloads.loading"
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                 ngbTooltip="Choose manual, auto, or fallback preference for captions mode">
                 @for (mode of subtitleModes; track mode.id) {
                   <option [ngValue]="mode.id">{{ mode.text }}</option>
@@ -300,7 +334,7 @@
                 name="downloadType"
                 [(ngModel)]="downloadType"
                 (change)="downloadTypeChanged()"
-                [disabled]="addInProgress || downloads.loading">
+                [disabled]="addInProgress || subscribeInProgress || downloads.loading">
                 @for (type of downloadTypes; track type.id) {
                   <option [ngValue]="type.id">{{ type.text }}</option>
                 }
@@ -345,7 +379,7 @@
                       name="autoStart"
                       [(ngModel)]="autoStart"
                       (change)="autoStartChanged()"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Automatically start downloads when added">
                       <option [ngValue]="true">Yes</option>
                       <option [ngValue]="false">No</option>
@@ -362,7 +396,7 @@
                       addTagText="Create directory"
                       bindLabel="folder"
                       [(ngModel)]="folder"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       [virtualScroll]="true"
                       [clearable]="true"
                       [loading]="downloads.loading"
@@ -381,7 +415,7 @@
                       placeholder="Default"
                       name="customNamePrefix"
                       [(ngModel)]="customNamePrefix"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Add a prefix to downloaded filenames">
                   </div>
                 </div>
@@ -395,17 +429,31 @@
                       name="playlistItemLimit"
                       (keydown)="isNumber($event)"
                       [(ngModel)]="playlistItemLimit"
-                      [disabled]="addInProgress || downloads.loading"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                       ngbTooltip="Maximum number of items to download from a playlist or channel (0 = no limit)">
                   </div>
                 </div>
+                <div class="col-md-6">
+                  <div class="input-group">
+                    <span class="input-group-text">Subscription Check (min)</span>
+                    <input type="number"
+                      min="1"
+                      class="form-control"
+                      name="checkIntervalMinutes"
+                      (keydown)="isNumber($event)"
+                      [(ngModel)]="checkIntervalMinutes"
+                      (ngModelChange)="checkIntervalChanged()"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                      ngbTooltip="How often to poll subscriptions for new videos">
+                  </div>
+                </div>
                 <div class="col-12">
                   <div class="row g-2 align-items-center">
                     <div class="col-auto">
                       <div class="form-check form-switch">
                         <input class="form-check-input" type="checkbox" role="switch" id="checkbox-split-chapters"
                           name="splitByChapters" [(ngModel)]="splitByChapters" (change)="splitByChaptersChanged()"
-                          [disabled]="addInProgress || downloads.loading"
+                          [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                           ngbTooltip="Split video into separate files by chapters">
                         <label class="form-check-label" for="checkbox-split-chapters">Split by chapters</label>
                       </div>
@@ -415,7 +463,7 @@
                       <div class="input-group">
                         <span class="input-group-text">Template</span>
                         <input type="text" class="form-control" name="chapterTemplate" [(ngModel)]="chapterTemplate"
-                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || downloads.loading"
+                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || subscribeInProgress || downloads.loading"
                           ngbTooltip="Output template for chapter files">
                       </div>
                     </div>
@@ -745,6 +793,127 @@
       </tbody>
     </table>
   </div>
+
+  <div class="metube-section-header">Subscriptions</div>
+  <div class="px-2 py-3 border-bottom">
+    @if (checkingAllSubscriptions) {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled>
+        <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>Check all now
+      </button>
+    } @else {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+        (click)="checkAllSubscriptions()"
+        [disabled]="downloads.loading || cachedSubs.length === 0 || checkingSelectedSubscriptions">
+        <fa-icon [icon]="faRedoAlt" />&nbsp; Check all now
+      </button>
+    }
+    @if (checkingSelectedSubscriptions) {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4" disabled>
+        <span class="spinner-border spinner-border-sm me-2" role="status" aria-hidden="true"></span>Check selected
+      </button>
+    } @else {
+      <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+        (click)="checkSelectedSubscriptions()"
+        [disabled]="downloads.loading || selectedSubscriptionIds.size === 0 || checkingAllSubscriptions">
+        <fa-icon [icon]="faRedoAlt" />&nbsp; Check selected
+      </button>
+    }
+    <button type="button" class="btn btn-link text-decoration-none px-0 me-4"
+      (click)="deleteSelectedSubscriptions()"
+      [disabled]="downloads.loading || selectedSubscriptionIds.size === 0">
+      <fa-icon [icon]="faTrashAlt" />&nbsp; Delete selected
+    </button>
+  </div>
+  <div class="overflow-auto">
+    <table class="table">
+      <thead>
+        <tr>
+          <th scope="col" style="width: 1rem;">
+            <input type="checkbox" class="form-check-input"
+              [checked]="allSubsSelected()"
+              (change)="toggleSubMaster($event)"
+              [disabled]="downloads.loading || cachedSubs.length === 0"
+              aria-label="Select all subscriptions" />
+          </th>
+          <th scope="col">Name</th>
+          <th scope="col">URL</th>
+          <th scope="col" class="text-nowrap">Interval (min)</th>
+          <th scope="col" class="text-nowrap">Last checked</th>
+          <th scope="col">Status</th>
+          <th scope="col" style="width: 8rem;"></th>
+        </tr>
+      </thead>
+      <tbody>
+        @for (entry of cachedSubs; track entry[0]) {
+          <tr>
+            <td>
+              <input type="checkbox" class="form-check-input"
+                [checked]="isSubSelected(entry[0])"
+                (change)="toggleSubSelected(entry[0])"
+                [disabled]="downloads.loading"
+                [attr.aria-label]="'Select subscription ' + entry[1].name" />
+            </td>
+            <td>{{ entry[1].name }}</td>
+            <td class="text-break"><a [href]="entry[1].url" target="_blank" rel="noopener">{{ entry[1].url }}</a></td>
+            <td>{{ entry[1].check_interval_minutes }}</td>
+            <td class="text-nowrap">
+              @if (entry[1].last_checked !== null) {
+                <span>{{ entry[1].last_checked! * 1000 | date:'yyyy-MM-dd HH:mm:ss' }}</span>
+              } @else {
+                <span class="text-muted">—</span>
+              }
+            </td>
+            <td>
+              @if (entry[1].error) {
+                <span class="text-danger small">{{ entry[1].error }}</span>
+              } @else if (entry[1].enabled) {
+                <span class="text-success">Active</span>
+              } @else {
+                <span class="text-secondary">Paused</span>
+              }
+            </td>
+            <td>
+              <div class="d-flex flex-wrap gap-1">
+                @if (isSubscriptionChecking(entry[0])) {
+                  <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                    disabled
+                    [attr.aria-label]="'Checking ' + entry[1].name"
+                    ngbTooltip="Checking now">
+                    <span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span>
+                  </button>
+                } @else {
+                  <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                    (click)="checkSubscriptionNow(entry[0])"
+                    [disabled]="downloads.loading"
+                    [attr.aria-label]="'Check now ' + entry[1].name"
+                    ngbTooltip="Check now">
+                    <fa-icon [icon]="faRedoAlt" />
+                  </button>
+                }
+                <button type="button" class="btn btn-link btn-sm p-0 me-2"
+                  (click)="toggleSubscriptionEnabled(entry[1])"
+                  [disabled]="downloads.loading"
+                  [attr.aria-label]="(entry[1].enabled ? 'Pause ' : 'Resume ') + entry[1].name"
+                  [ngbTooltip]="entry[1].enabled ? 'Pause' : 'Resume'">
+                  @if (entry[1].enabled) {
+                    <fa-icon [icon]="faPause" />
+                  } @else {
+                    <fa-icon [icon]="faPlay" />
+                  }
+                </button>
+                <button type="button" class="btn btn-link btn-sm p-0 text-danger"
+                  (click)="deleteSubscription(entry[0])"
+                  [disabled]="downloads.loading"
+                  [attr.aria-label]="'Delete subscription ' + entry[1].name">
+                  <fa-icon [icon]="faTrashAlt" />
+                </button>
+              </div>
+            </td>
+          </tr>
+        }
+      </tbody>
+    </table>
+  </div>
 </main><!-- /.container -->
 
 <footer class="footer navbar-dark bg-dark py-3 mt-5">

ui/src/app/app.ts

@@ -1,16 +1,18 @@
-import { AsyncPipe, DatePipe, KeyValuePipe } from '@angular/common';
+import { AsyncPipe, DatePipe, KeyValuePipe, NgTemplateOutlet } from '@angular/common';
 import { HttpClient } from '@angular/common/http';
 import { AfterViewInit, ChangeDetectionStrategy, ChangeDetectorRef, Component, DestroyRef, ElementRef, viewChild, inject, OnDestroy, OnInit } from '@angular/core';
-import { Observable, map, distinctUntilChanged } from 'rxjs';
+import { Observable, Subscription, map, distinctUntilChanged, finalize } from 'rxjs';
 import { FormsModule } from '@angular/forms';
 import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
 import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
 import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
 import { NgSelectModule } from '@ng-select/ng-select';  
-import { faTrashAlt, faCheckCircle, faTimesCircle, faRedoAlt, faSun, faMoon, faCheck, faCircleHalfStroke, faDownload, faExternalLinkAlt, faFileImport, faFileExport, faCopy, faClock, faTachometerAlt, faSortAmountDown, faSortAmountUp, faChevronRight, faChevronDown, faUpload } from '@fortawesome/free-solid-svg-icons';
+import { faTrashAlt, faCheckCircle, faTimesCircle, faRedoAlt, faSun, faMoon, faCheck, faCircleHalfStroke, faDownload, faExternalLinkAlt, faFileImport, faFileExport, faCopy, faClock, faTachometerAlt, faSortAmountDown, faSortAmountUp, faChevronRight, faChevronDown, faUpload, faPause, faPlay } from '@fortawesome/free-solid-svg-icons';
 import { faGithub } from '@fortawesome/free-brands-svg-icons';
 import { CookieService } from 'ngx-cookie-service';
 import { AddDownloadPayload, DownloadsService } from './services/downloads.service';
+import { SubscriptionsService } from './services/subscriptions.service';
+import { SubscriptionRow } from './interfaces/subscription';
 import { Themes } from './theme';
 import {
   Download,
@@ -36,6 +38,7 @@ import { SelectAllCheckboxComponent, ItemCheckboxComponent } from './components/
   changeDetection: ChangeDetectionStrategy.OnPush,
   imports: [
         FormsModule,
+        NgTemplateOutlet,
         KeyValuePipe,
         AsyncPipe,
         DatePipe,
@@ -53,6 +56,7 @@ import { SelectAllCheckboxComponent, ItemCheckboxComponent } from './components/
 })
 export class App implements AfterViewInit, OnInit, OnDestroy {
   downloads = inject(DownloadsService);
+  subscriptionsSvc = inject(SubscriptionsService);
   private cookieService = inject(CookieService);
   private http = inject(HttpClient);
   private cdr = inject(ChangeDetectorRef);
@@ -81,6 +85,13 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   subtitleMode: string;
   addInProgress = false;
   cancelRequested = false;
+  subscribeInProgress = false;
+  checkIntervalMinutes = 60;
+  cachedSubs: [string, SubscriptionRow][] = [];
+  selectedSubscriptionIds = new Set<string>();
+  checkingSubscriptionIds = new Set<string>();
+  checkingAllSubscriptions = false;
+  checkingSelectedSubscriptions = false;
   hasCookies = false;
   cookieUploadInProgress = false;
   themes: Theme[] = Themes;
@@ -101,6 +112,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   cachedSortedDone: [string, Download][] = [];
   lastCopiedErrorId: string | null = null;
   private previousDownloadType = 'video';
+  private addRequestSub?: Subscription;
   private selectionsByType: Record<string, {
     codec: string;
     format: string;
@@ -155,6 +167,8 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   faChevronRight = faChevronRight;
   faChevronDown = faChevronDown;
   faUpload = faUpload;
+  faPause = faPause;
+  faPlay = faPlay;
   subtitleLanguages = [
     { id: 'en', text: 'English' },
     { id: 'ar', text: 'Arabic' },
@@ -238,6 +252,10 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.saveSelection(this.downloadType);
     this.sortAscending = this.cookieService.get('metube_sort_ascending') === 'true';
 
+    const ci = parseInt(this.cookieService.get('metube_check_interval') || '', 10);
+    if (!Number.isNaN(ci) && ci >= 1) {
+      this.checkIntervalMinutes = ci;
+    }
     this.activeTheme = this.getPreferredTheme(this.cookieService);
 
     // Subscribe to download updates
@@ -255,6 +273,11 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       this.updateMetrics();
       this.cdr.markForCheck();
     });
+
+    this.subscriptionsSvc.subscriptionsChanged.pipe(takeUntilDestroyed(this.destroyRef)).subscribe(() => {
+      this.rebuildCachedSubs();
+      this.cdr.markForCheck();
+    });
   }
 
   ngOnInit() {
@@ -286,6 +309,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   }
 
   ngOnDestroy() {
+    this.addRequestSub?.unsubscribe();
     this.colorSchemeMediaQuery.removeEventListener('change', this.onColorSchemeChanged);
   }
 
@@ -380,11 +404,239 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
         if (!this.chapterTemplate) {
           this.chapterTemplate = config['OUTPUT_TEMPLATE_CHAPTER'];
         }
+        if (!this.cookieService.check('metube_check_interval')) {
+          const dci = parseInt(String(config['SUBSCRIPTION_DEFAULT_CHECK_INTERVAL'] ?? 60), 10);
+          if (!Number.isNaN(dci) && dci >= 1) {
+            this.checkIntervalMinutes = dci;
+          }
+        }
         this.cdr.markForCheck();
       }
     });
   }
 
+  private rebuildCachedSubs() {
+    this.cachedSubs = Array.from(this.subscriptionsSvc.subscriptions.entries());
+    const validIds = new Set(this.cachedSubs.map(([id]) => id));
+    for (const id of [...this.selectedSubscriptionIds]) {
+      if (!validIds.has(id)) {
+        this.selectedSubscriptionIds.delete(id);
+      }
+    }
+  }
+
+  checkIntervalChanged() {
+    this.cookieService.set('metube_check_interval', String(this.checkIntervalMinutes), {
+      expires: this.settingsCookieExpiryDays,
+    });
+  }
+
+  private getStatusError(res: unknown): string | null {
+    const status = res as { status?: string; msg?: string };
+    return status?.status === 'error' ? status.msg || null : null;
+  }
+
+  private refreshSubscriptionsWithAlert() {
+    this.subscriptionsSvc.refreshList().pipe(takeUntilDestroyed(this.destroyRef)).subscribe((refreshRes) => {
+      const error = this.getStatusError(refreshRes);
+      if (error) {
+        alert(error || 'Refresh subscriptions failed');
+        return;
+      }
+      this.cdr.markForCheck();
+    });
+  }
+
+  isSubSelected(id: string): boolean {
+    return this.selectedSubscriptionIds.has(id);
+  }
+
+  toggleSubSelected(id: string) {
+    if (this.selectedSubscriptionIds.has(id)) {
+      this.selectedSubscriptionIds.delete(id);
+    } else {
+      this.selectedSubscriptionIds.add(id);
+    }
+    this.cdr.markForCheck();
+  }
+
+  toggleSubMaster(event: Event) {
+    const checked = (event.target as HTMLInputElement).checked;
+    this.selectedSubscriptionIds.clear();
+    if (checked) {
+      for (const [id] of this.cachedSubs) {
+        this.selectedSubscriptionIds.add(id);
+      }
+    }
+    this.cdr.markForCheck();
+  }
+
+  allSubsSelected(): boolean {
+    if (this.cachedSubs.length === 0) {
+      return false;
+    }
+    return this.cachedSubs.every(([id]) => this.selectedSubscriptionIds.has(id));
+  }
+
+  addSubscription() {
+    if (this.subscribeInProgress) {
+      return;
+    }
+    const payload = this.buildAddPayload();
+    if (!payload.url?.trim()) {
+      alert('Please enter a URL');
+      return;
+    }
+    if (payload.splitByChapters && !payload.chapterTemplate.includes('%(section_number)')) {
+      alert('Chapter template must include %(section_number)');
+      return;
+    }
+    this.subscribeInProgress = true;
+    this.subscriptionsSvc
+      .subscribe({
+        ...payload,
+        checkIntervalMinutes: this.checkIntervalMinutes,
+      })
+      .pipe(
+        takeUntilDestroyed(this.destroyRef),
+        finalize(() => {
+          this.subscribeInProgress = false;
+          this.cdr.markForCheck();
+        }),
+      )
+      .subscribe({
+        next: (res) => {
+          const r = res as { status?: string; msg?: string };
+          if (r.status === 'error') {
+            alert(r.msg || 'Subscribe failed');
+          } else {
+            this.addUrl = '';
+          }
+        },
+      });
+  }
+
+  deleteSubscription(id: string) {
+    this.subscriptionsSvc.delete([id]).subscribe((res) => {
+      const error = this.getStatusError(res);
+      if (error) {
+        alert(error || 'Delete subscription failed');
+        return;
+      }
+      this.selectedSubscriptionIds.delete(id);
+      this.cdr.markForCheck();
+    });
+  }
+
+  deleteSelectedSubscriptions() {
+    const ids = Array.from(this.selectedSubscriptionIds);
+    if (!ids.length) {
+      return;
+    }
+    this.subscriptionsSvc.delete(ids).subscribe((res) => {
+      const error = this.getStatusError(res);
+      if (error) {
+        alert(error || 'Delete subscriptions failed');
+        return;
+      }
+      this.selectedSubscriptionIds.clear();
+      this.cdr.markForCheck();
+    });
+  }
+
+  checkSubscriptionNow(id: string) {
+    if (this.checkingSubscriptionIds.has(id)) {
+      return;
+    }
+    this.checkingSubscriptionIds.add(id);
+    this.cdr.markForCheck();
+    this.subscriptionsSvc
+      .checkNow([id])
+      .pipe(
+        takeUntilDestroyed(this.destroyRef),
+        finalize(() => {
+          this.checkingSubscriptionIds.delete(id);
+          this.cdr.markForCheck();
+        }),
+      )
+      .subscribe((res) => {
+        const error = this.getStatusError(res);
+        if (error) {
+          alert(error || 'Subscription check failed');
+          return;
+        }
+        this.refreshSubscriptionsWithAlert();
+      });
+  }
+
+  isSubscriptionChecking(id: string): boolean {
+    return this.checkingSubscriptionIds.has(id);
+  }
+
+  private runBulkSubscriptionCheck(ids: string[] | undefined, mode: 'all' | 'selected') {
+    const targetIds = ids ?? this.cachedSubs.filter(([, row]) => row.enabled).map(([id]) => id);
+    if (!targetIds.length) {
+      return;
+    }
+
+    const checkedIds = new Set(targetIds);
+    for (const id of checkedIds) {
+      this.checkingSubscriptionIds.add(id);
+    }
+    if (mode === 'all') {
+      this.checkingAllSubscriptions = true;
+    } else {
+      this.checkingSelectedSubscriptions = true;
+    }
+    this.cdr.markForCheck();
+
+    this.subscriptionsSvc
+      .checkNow(ids)
+      .pipe(
+        takeUntilDestroyed(this.destroyRef),
+        finalize(() => {
+          for (const id of checkedIds) {
+            this.checkingSubscriptionIds.delete(id);
+          }
+          if (mode === 'all') {
+            this.checkingAllSubscriptions = false;
+          } else {
+            this.checkingSelectedSubscriptions = false;
+          }
+          this.cdr.markForCheck();
+        }),
+      )
+      .subscribe((res) => {
+        const error = this.getStatusError(res);
+        if (error) {
+          alert(error || 'Subscription check failed');
+          return;
+        }
+        this.refreshSubscriptionsWithAlert();
+      });
+  }
+
+  checkSelectedSubscriptions() {
+    const ids = Array.from(this.selectedSubscriptionIds);
+    if (!ids.length) {
+      return;
+    }
+    this.runBulkSubscriptionCheck(ids, 'selected');
+  }
+
+  checkAllSubscriptions() {
+    this.runBulkSubscriptionCheck(undefined, 'all');
+  }
+
+  toggleSubscriptionEnabled(row: SubscriptionRow) {
+    this.subscriptionsSvc.update(row.id, { enabled: !row.enabled }).subscribe((res) => {
+      const error = this.getStatusError(res);
+      if (error) {
+        alert(error || 'Update subscription failed');
+      }
+    });
+  }
+
   getPreferredTheme(cookieService: CookieService) {
     let theme = 'auto';
     if (cookieService.check('metube_theme')) {
@@ -474,13 +726,13 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   }
 
   queueSelectionChanged(checked: number) {
-    this.queueDelSelected().nativeElement.disabled = checked == 0;
-    this.queueDownloadSelected().nativeElement.disabled = checked == 0;
+    this.queueDelSelected().nativeElement.disabled = checked === 0;
+    this.queueDownloadSelected().nativeElement.disabled = checked === 0;
   }
 
   doneSelectionChanged(checked: number) {
-    this.doneDelSelected().nativeElement.disabled = checked == 0;
-    this.doneDownloadSelected().nativeElement.disabled = checked == 0;
+    this.doneDelSelected().nativeElement.disabled = checked === 0;
+    this.doneDownloadSelected().nativeElement.disabled = checked === 0;
   }
 
   private updateDoneActionButtons() {
@@ -657,26 +909,38 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     console.debug('Downloading:', payload);
     this.addInProgress = true;
     this.cancelRequested = false;
-    this.downloads.add(payload).subscribe((status: Status) => {
+    this.addRequestSub?.unsubscribe();
+    this.addRequestSub = this.downloads.add(payload).subscribe((status: Status) => {
       if (status.status === 'error' && !this.cancelRequested) {
         alert(`Error adding URL: ${status.msg}`);
       } else if (status.status !== 'error') {
         this.addUrl = '';
       }
-      this.addInProgress = false;
-      this.cancelRequested = false;
+      this.resetAddState();
     });
   }
 
   cancelAdding() {
     this.cancelRequested = true;
     this.downloads.cancelAdd().subscribe({
+      next: () => {
+        this.addRequestSub?.unsubscribe();
+        this.resetAddState();
+      },
       error: (err) => {
+        this.cancelRequested = false;
         console.error('Failed to cancel adding:', err?.message || err);
       }
     });
   }
 
+  private resetAddState() {
+    this.addRequestSub = undefined;
+    this.addInProgress = false;
+    this.cancelRequested = false;
+    this.cdr.markForCheck();
+  }
+
   downloadItemByKey(id: string) {
     this.downloads.startById([id]).subscribe();
   }

ui/src/app/components/master-checkbox.component.ts

@@ -33,7 +33,7 @@ export class SelectAllCheckboxComponent {
       return;
     let checked = 0;
     this.list().forEach(item => { if(item.checked) checked++ });
-    this.selected = checked > 0 && checked == this.list().size;
+    this.selected = checked > 0 && checked === this.list().size;
     masterCheckbox.nativeElement.indeterminate = checked > 0 && checked < this.list().size;
     this.changed.emit(checked);
   }

ui/src/app/interfaces/index.ts

@@ -6,4 +6,4 @@ export * from './download';
 export * from './checkable';
 export * from './format';
 export * from './formats';
-
+export * from './subscription';

ui/src/app/interfaces/subscription.ts

@@ -0,0 +1,15 @@
+export interface SubscriptionRow {
+  id: string;
+  name: string;
+  url: string;
+  enabled: boolean;
+  check_interval_minutes: number;
+  download_type: string;
+  codec: string;
+  format: string;
+  quality: string;
+  folder: string;
+  last_checked: number | null;
+  seen_count: number;
+  error: string | null;
+}

ui/src/app/services/subscriptions.service.ts

@@ -0,0 +1,128 @@
+import { DestroyRef, inject, Injectable } from '@angular/core';
+import { HttpClient, HttpErrorResponse } from '@angular/common/http';
+import { of, Subject } from 'rxjs';
+import { catchError, tap } from 'rxjs/operators';
+import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
+import { MeTubeSocket } from './metube-socket.service';
+import { SubscriptionRow } from '../interfaces/subscription';
+import { Status } from '../interfaces';
+import { AddDownloadPayload } from './downloads.service';
+
+export interface SubscribePayload extends AddDownloadPayload {
+  checkIntervalMinutes: number;
+}
+
+@Injectable({
+  providedIn: 'root',
+})
+export class SubscriptionsService {
+  private http = inject(HttpClient);
+  private socket = inject(MeTubeSocket);
+  private destroyRef = inject(DestroyRef);
+
+  subscriptions = new Map<string, SubscriptionRow>();
+  subscriptionsChanged = new Subject<void>();
+
+  private publishList(rows: SubscriptionRow[]) {
+    this.subscriptions.clear();
+    for (const row of rows) {
+      this.subscriptions.set(row.id, row);
+    }
+    this.subscriptionsChanged.next();
+  }
+
+  constructor() {
+    this.socket
+      .fromEvent('subscriptions_all')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const data: SubscriptionRow[] = JSON.parse(strdata);
+        this.publishList(data);
+      });
+
+    this.socket
+      .fromEvent('subscription_added')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const row: SubscriptionRow = JSON.parse(strdata);
+        this.subscriptions.set(row.id, row);
+        this.subscriptionsChanged.next();
+      });
+
+    this.socket
+      .fromEvent('subscription_updated')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const row: SubscriptionRow = JSON.parse(strdata);
+        this.subscriptions.set(row.id, row);
+        this.subscriptionsChanged.next();
+      });
+
+    this.socket
+      .fromEvent('subscription_removed')
+      .pipe(takeUntilDestroyed(this.destroyRef))
+      .subscribe((strdata: string) => {
+        const id: string = JSON.parse(strdata);
+        this.subscriptions.delete(id);
+        this.subscriptionsChanged.next();
+      });
+  }
+
+  handleHTTPError(error: HttpErrorResponse) {
+    const msg =
+      error.error instanceof ErrorEvent
+        ? error.error.message
+        : typeof error.error === 'string'
+          ? error.error
+          : error.error?.msg || error.message || 'Request failed';
+    return of({ status: 'error' as const, msg });
+  }
+
+  subscribe(payload: SubscribePayload) {
+    return this.http
+      .post<Status>('subscribe', {
+        url: payload.url,
+        download_type: payload.downloadType,
+        codec: payload.codec,
+        quality: payload.quality,
+        format: payload.format,
+        folder: payload.folder,
+        custom_name_prefix: payload.customNamePrefix,
+        playlist_item_limit: payload.playlistItemLimit,
+        auto_start: payload.autoStart,
+        split_by_chapters: payload.splitByChapters,
+        chapter_template: payload.chapterTemplate,
+        subtitle_language: payload.subtitleLanguage,
+        subtitle_mode: payload.subtitleMode,
+        check_interval_minutes: payload.checkIntervalMinutes,
+      })
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  delete(ids: string[]) {
+    return this.http.post('subscriptions/delete', { ids }).pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  update(id: string, changes: Partial<Pick<SubscriptionRow, 'enabled' | 'check_interval_minutes' | 'name'>>) {
+    return this.http
+      .post('subscriptions/update', { id, ...changes })
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  checkNow(ids?: string[]) {
+    return this.http
+      .post('subscriptions/check', ids?.length ? { ids } : {})
+      .pipe(catchError((err) => this.handleHTTPError(err)));
+  }
+
+  fetchList() {
+    return this.http.get<SubscriptionRow[]>('subscriptions').pipe(catchError(() => of([])));
+  }
+
+  refreshList() {
+    return this.http.get<SubscriptionRow[]>('subscriptions').pipe(
+      tap((rows) => this.publishList(rows)),
+      catchError((err) => this.handleHTTPError(err)),
+    );
+  }
+}

uv.lock

@@ -13,7 +13,7 @@ wheels = [
 
 [[package]]
 name = "aiohttp"
-version = "3.13.3"
+version = "3.13.5"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "aiohappyeyeballs" },
@@ -24,59 +24,59 @@ dependencies = [
     { name = "propcache" },
     { name = "yarl" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/50/42/32cf8e7704ceb4481406eb87161349abb46a57fee3f008ba9cb610968646/aiohttp-3.13.3.tar.gz", hash = "sha256:a949eee43d3782f2daae4f4a2819b2cb9b0c5d3b7f7a927067cc84dafdbb9f88", size = 7844556, upload-time = "2026-01-03T17:33:05.204Z" }
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