bvandeusen
fb4431207d
Milestone #127 step 2 (#1249). For You deliberately blends two populations — a head of top-scored taste picks and a tail sampled from deeper ranking (the freshness injection) — but the metrics judged it as one blob, so its skip rate couldn't distinguish "the taste engine is missing" from "the freshness tax is too high". That number decides the exploration share before we tune it. - Migration 0038: nullable pick_kind ('taste'|'fresh') on both playlist_tracks (stamped at snapshot build) and play_events (frozen at play-ingestion — the snapshot rebuilds daily, so attribution cannot be reconstructed at read time). - Builder: pickHeadAndTail marks head=taste / tail=fresh; the small-pool fallback is all taste (top-N-by-score IS the taste mechanism). Other variants persist NULL. - Ingestion: for_you plays (live + offline replay) look the track up in the user's current snapshot; not found → unattributed, never guessed. - Metrics: For You's row gains a breakdown (taste / fresh / earlier unattributed plays), parent row stays the sum; web card renders the sub-rows indented with the same baseline deltas + low-data dimming. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TsF3cNoKrqCYsU78cXC8U6
97 lines
3.2 KiB
SQL
97 lines
3.2 KiB
SQL
-- name: GetMostRecentPlaySessionForUser :one
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SELECT * FROM play_sessions
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WHERE user_id = $1
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ORDER BY last_event_at DESC
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LIMIT 1;
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-- name: InsertPlaySession :one
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INSERT INTO play_sessions (user_id, started_at, last_event_at, client_id)
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VALUES ($1, $2, $2, $3)
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RETURNING *;
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-- name: TouchPlaySessionLastEvent :exec
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UPDATE play_sessions
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SET last_event_at = $2,
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track_count = track_count + 1
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WHERE id = $1;
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-- name: GetOpenPlayEventForUser :one
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-- Returns the most recent play_event for a user where ended_at IS NULL.
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-- Used by the auto-close-prior step in playevents.RecordPlayStarted.
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SELECT * FROM play_events
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WHERE user_id = $1 AND ended_at IS NULL
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ORDER BY started_at DESC
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LIMIT 1;
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-- name: InsertPlayEvent :one
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-- pick_kind is non-NULL only for source='for_you' plays whose track was
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-- found in the user's live For You snapshot at ingestion time (#1249).
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INSERT INTO play_events (
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user_id, track_id, session_id, started_at, client_id, source, pick_kind
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) VALUES ($1, $2, $3, $4, $5, $6, sqlc.narg(pick_kind)::text)
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RETURNING *;
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-- name: GetForYouPickKindForTrack :one
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-- Looks a track up in the user's CURRENT For You snapshot and returns
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-- its pick_kind ('taste'/'fresh'). Used at play-ingestion time to
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-- freeze exploration attribution onto the play_event — the snapshot is
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-- rebuilt daily, so attribution can't be reconstructed at read time
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-- (#1249). No row = track not in today's snapshot (caller stores NULL).
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SELECT pt.pick_kind
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FROM playlist_tracks pt
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JOIN playlists p ON p.id = pt.playlist_id
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WHERE p.user_id = $1
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AND p.system_variant = 'for_you'
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AND pt.track_id = $2
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LIMIT 1;
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-- name: UpdatePlayEventEnded :one
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-- Closes a play_event by id with the given ended_at, duration, and skip flag.
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-- completion_ratio is computed from duration_played_ms and the track duration
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-- (looked up by the caller — sqlc doesn't do joins on UPDATE).
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UPDATE play_events
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SET ended_at = $2,
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duration_played_ms = $3,
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completion_ratio = $4,
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was_skipped = $5
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WHERE id = $1
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RETURNING *;
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-- name: GetPlayEventByID :one
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SELECT * FROM play_events WHERE id = $1;
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-- name: InsertSkipEvent :one
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INSERT INTO skip_events (user_id, track_id, session_id, skipped_at, position_ms)
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VALUES ($1, $2, $3, $4, $5)
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RETURNING *;
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-- name: ListRecentSessionTracks :many
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-- Returns up to $3 tracks in session $1 whose play_event started before
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-- $2, ordered newest-first. Used by playevents.RecordPlayStarted to
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-- build the session_vector for the just-inserted play_event.
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SELECT t.* FROM tracks t
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JOIN play_events pe ON pe.track_id = t.id
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WHERE pe.session_id = $1
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AND pe.started_at < $2
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ORDER BY pe.started_at DESC
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LIMIT $3;
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-- name: UpdatePlayEventVector :exec
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-- Used right after InsertPlayEvent to populate session_vector_at_play
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-- once the vector has been computed.
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UPDATE play_events
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SET session_vector_at_play = $2
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WHERE id = $1;
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-- name: GetCurrentSessionVectorForUser :one
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-- Returns the session_vector_at_play of the user's most recent play_event
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-- in a still-active (un-timed-out) session. NoRows means no current vector.
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-- Joined with play_sessions so closed sessions don't leak stale vectors.
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SELECT pe.session_vector_at_play
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FROM play_events pe
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JOIN play_sessions s ON s.id = pe.session_id
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WHERE pe.user_id = $1
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AND s.ended_at IS NULL
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ORDER BY pe.started_at DESC
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LIMIT 1;
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