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47 lines
2.0 KiB
SQL
47 lines
2.0 KiB
SQL
-- Denormalized latest-per-event view of memory_completions.
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-- Powers /api/memories/latest, /api/memory/:eventId, /api/sitemap.
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-- Update memory_events alongside any schema change to memory_completions.
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CREATE TABLE IF NOT EXISTS memory_events (
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event_id TEXT PRIMARY KEY,
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anim_index INTEGER NOT NULL,
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completed_at INTEGER NOT NULL,
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participants TEXT NOT NULL,
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language TEXT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_memory_events_completed_at
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ON memory_events(completed_at DESC);
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-- AFTER INSERT does not fire when INSERT OR IGNORE hits the UNIQUE conflict,
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-- so duplicate completions correctly do not update memory_events.
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CREATE TRIGGER IF NOT EXISTS memory_events_after_insert
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AFTER INSERT ON memory_completions
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BEGIN
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INSERT INTO memory_events (event_id, anim_index, completed_at, participants, language)
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VALUES (NEW.event_id, NEW.anim_index, NEW.completed_at, NEW.participants, NEW.language)
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ON CONFLICT(event_id) DO UPDATE SET
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anim_index = excluded.anim_index,
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completed_at = excluded.completed_at,
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participants = excluded.participants,
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language = excluded.language
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WHERE excluded.completed_at > memory_events.completed_at;
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END;
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-- Backfill: pick the latest row per event_id deterministically by (completed_at DESC, id DESC).
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-- UPSERT semantics so writes captured by the trigger between CREATE TRIGGER and now are not clobbered.
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INSERT INTO memory_events (event_id, anim_index, completed_at, participants, language)
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SELECT event_id, anim_index, completed_at, participants, language
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FROM memory_completions mc
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WHERE id = (
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SELECT id FROM memory_completions mc2
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WHERE mc2.event_id = mc.event_id
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ORDER BY completed_at DESC, id DESC
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LIMIT 1
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)
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ON CONFLICT(event_id) DO UPDATE SET
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anim_index = excluded.anim_index,
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completed_at = excluded.completed_at,
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participants = excluded.participants,
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language = excluded.language
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WHERE excluded.completed_at >= memory_events.completed_at;
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