* fix: prevent foreign key constraint error in tag UpdateCounts
Added JOIN clause with tag table in UpdateCounts SQL query to filter out
tag IDs from JSON that don't exist in the tag table. This prevents
'FOREIGN KEY constraint failed' errors when the library_tag table
tries to reference non-existent tag IDs during scanner operations.
The fix ensures only valid tag references are counted while maintaining
data integrity and preventing scanner failures during library updates.
* test(tag): add regression tests for foreign key constraint fix
Add comprehensive regression tests to prevent the foreign key constraint
error when tag IDs in JSON data don't exist in the tag table. Tests cover
both album and media file scenarios with non-existent tag IDs.
- Test UpdateCounts() with albums containing non-existent tag IDs
- Test UpdateCounts() with media files containing non-existent tag IDs
- Verify operations complete without foreign key errors
Signed-off-by: Deluan <deluan@navidrome.org>
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Signed-off-by: Deluan <deluan@navidrome.org>
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