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fix(rescan): delete downloaded episode rows when no longer missing

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A finished download marks the Episode row with is_downloaded=True and
populates file_path (commit 0ba2587). The intent was to preserve
download history, but the row stayed in the DB forever because two
sibling sync methods refused to delete it:

  - AnimeService._update_series_in_db: `downloaded_set` guard skipped
    deletion if the row was marked downloaded.
  - SerieScanner._sync_episodes_to_db: `if ep.is_downloaded: continue`
    kept downloaded rows.

The user-visible bug: the missing-list UI is correct (it filters by
is_downloaded and the broadcast rebuilds from the DB), but a finished
download left a stale entry in the DB that the user could see when
querying the database directly. Worse, this stale row accumulated
indefinitely across rescans.

Fix: drop the is_downloaded preservation guards. Once the scanner
confirms the file is on disk and the episode is no longer in the
missing set, the Episode row has no further purpose and is deleted to
keep the DB in sync with the filesystem. The UI derives "missing"
from row presence, so deleting the row is the correct way to make the
episode stop appearing as missing in *all* views (UI and DB queries).

Tests:
  - test_update_series_deletes_downloaded_episodes_when_no_longer_missing
    (RED): regression for _update_series_in_db.
  - test_update_series_keeps_still_missing_episodes: sanity sibling
    to ensure the fix does not over-reach and delete still-missing
    episodes.
  - test_deletes_downloaded_episodes_when_no_longer_missing
    (RED): regression for SerieScanner._sync_episodes_to_db.
  - Replaced test_preserves_downloaded_episodes (which asserted the
    old buggy behavior) with the deletion-asserting variant.
This commit is contained in:
Lukas
2026-09-15 20:34:12 +02:00
parent db5f5edf2d
commit 1d121b427d
4 changed files with 166 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
src/server/SerieScanner.py
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@@ -281,10 +281,13 @@ class SerieScanner:
async def _sync_episodes_to_db(
self, db, series_id: int, episode_dict: dict[int, list[int]]
) -> None:
"""Sync episodes to database, preserving downloaded flags.
"""Sync episodes to database.
Adds missing episodes, removes episodes no longer missing,
and preserves is_downloaded=True episodes.
Adds missing episodes, removes episodes no longer missing
(including those that were previously marked as downloaded:
once the scanner confirms the file is on disk, the row has
no further purpose and is deleted to keep the DB in sync
with the filesystem).
Args:
db: Async database session
@@ -301,15 +304,9 @@ class SerieScanner:
new_keys.add((season, ep_num))
for (season, ep_num), ep in existing_map.items():
if (season, ep_num) not in new_keys:
if ep.is_downloaded:
logger.debug(
"Preserving downloaded episode S%02dE%02d for series_id=%d",
season, ep_num, series_id
)
else:
await EpisodeService.delete_by_series(
db, series_id, season, ep_num
)
await EpisodeService.delete_by_series(
db, series_id, season, ep_num
)
for season, eps in episode_dict.items():
for ep_num in eps:
if (season, ep_num) not in existing_map: