bvandeusen
3ef560e414
Single SELECT that joins tracks with general_likes (for is_liked) and an aggregated LATERAL subquery on play_events (for last_played_at, play_count, skip_count). Excludes seed + tracks played in the last N hours. Drives the M3 weighted shuffle scoring.
30 lines
1.1 KiB
SQL
30 lines
1.1 KiB
SQL
-- name: LoadRadioCandidates :many
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-- Returns all tracks except the seed and any played by the user within
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-- the last $3 hours, joined with the stats needed for scoring:
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-- is_liked — boolean from general_likes for this user
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-- last_played_at — max(play_events.started_at) for this user/track
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-- play_count — count of play_events for this user/track
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-- skip_count — play_events where was_skipped=true
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SELECT
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sqlc.embed(t),
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(l.user_id IS NOT NULL)::bool AS is_liked,
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pe.last_played_at::timestamptz AS last_played_at,
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pe.play_count,
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pe.skip_count
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FROM tracks t
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LEFT JOIN general_likes l ON l.user_id = $1 AND l.track_id = t.id
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LEFT JOIN LATERAL (
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SELECT
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max(started_at) AS last_played_at,
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count(*) AS play_count,
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count(*) FILTER (WHERE was_skipped) AS skip_count
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FROM play_events
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WHERE user_id = $1 AND track_id = t.id
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) pe ON true
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WHERE t.id <> $2
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AND NOT EXISTS (
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SELECT 1 FROM play_events
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WHERE user_id = $1 AND track_id = t.id
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AND started_at > now() - $3 * interval '1 hour'
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);
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