Coverage for fix 2.1:
TestResolveDbTrackIdsBatch:
- Batch returns the same (title, artist) -> id mapping as the
per-event lookup would have
- Case-insensitive matching preserved
- Empty event list returns an empty dict
- Events without a title are skipped
- A cursor-execute counter proxy confirms 50 events trigger exactly
one SQL query (not 50)
TestMapPlayCountsToDb:
- Returns updates only for server IDs that exist in tracks
- Empty input returns an empty list
- 30 server IDs trigger one batched query
TestEnrichStatsItems:
- Populates image_url / id / artist_id on matching artists, albums,
and tracks; skips rows with no match
- Empty or missing top_* lists are safe
- Three batched queries total (one per section) regardless of the
number of items in each list
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