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perf(db): index for you trending tie order #905

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perf(db): index for you trending tie order #905

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13 changes: 13 additions & 0 deletions ddl/migrations/0218_track_trending_scores_for_you_desc_tiebreak_idx.sql
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Original file line number Diff line number Diff line change
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-- The For You feed orders weekly track candidates by score DESC, track_id DESC.
-- The older partial index uses track_id ascending, leaving PostgreSQL to do an
-- incremental sort after the index scan. Match the API order exactly.

create index concurrently if not exists idx_track_trending_scores_for_you_desc_tiebreak
on track_trending_scores (score desc, track_id desc)
where type = 'TRACKS'
and version = 'pnagD'
and time_range = 'week'
and (genre is null or genre = '');

comment on index idx_track_trending_scores_for_you_desc_tiebreak is
'Partial index matching For You feed weekly track candidate ordering by score desc, track_id desc.';
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