Critical bug fix: The filter was returning the wrong series because of
a misunderstanding of the episode table semantics.
ISSUE:
- Episodes table contains MISSING episodes (from episodeDict)
- is_downloaded=False means episode file not found in folder
- Original query logic was backwards - returned series with NO missing
episodes instead of series WITH missing episodes
SOLUTION:
- Simplified query to directly check for episodes with is_downloaded=False
- Changed from complex join with count aggregation to simple subquery
- Now correctly returns series that have at least one undownloaded episode
CHANGES:
- src/server/database/service.py: Rewrote get_series_with_no_episodes()
method with corrected logic and clearer documentation
- tests/unit/test_series_filter.py: Updated test expectations to match
corrected behavior with detailed comments explaining episode semantics
- docs/API.md: Enhanced documentation explaining filter behavior and
episode table meaning
TESTS:
All 5 unit tests pass with corrected logic
