bvandeusen
92ef53c04d
Table was referenced in migration 0005's comment but never created — this slice fills the gap. Soft-delete via deleted_at column; hot-path partial index on active rows; GIN index on session_vector for M3 sub-plan #3's similarity queries.
33 lines
1.5 KiB
SQL
33 lines
1.5 KiB
SQL
-- contextual_likes captures a per-session-context snapshot at the time of
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-- each like. The recommendation engine in M3 sub-plan #3 uses these rows
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-- to compute contextual_match_score per (current session, candidate track).
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--
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-- Multiple rows per (user, track) are allowed and expected — each row
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-- represents a like in a specific session context. Soft-deleted rows
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-- remain in the table (deleted_at populated) but are filtered out of the
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-- engine's queries via the partial index. Re-liking a previously-unliked
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-- track adds a NEW row (does not undelete the old one).
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--
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-- Note: the M2 events migration (0005) commented that contextual_likes
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-- "ships nullable now" but the actual CREATE TABLE was missed. This slice
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-- ships the table for the first time.
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CREATE TABLE contextual_likes (
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id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
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user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
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track_id uuid NOT NULL REFERENCES tracks(id) ON DELETE CASCADE,
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liked_at timestamptz NOT NULL DEFAULT now(),
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deleted_at timestamptz,
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session_vector jsonb,
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session_id uuid REFERENCES play_sessions(id) ON DELETE SET NULL
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);
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-- Hot path for both the engine's lookups and the soft-delete UPDATE.
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CREATE INDEX contextual_likes_active_idx
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ON contextual_likes (user_id, track_id)
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WHERE deleted_at IS NULL;
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-- Vector similarity queries from M3 sub-plan #3 will use this.
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CREATE INDEX contextual_likes_vector_idx
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ON contextual_likes USING gin (session_vector);
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