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The account-deletion reconcile in account.ts uses a correlated subquery to pick the latest-per-event row from memory_completions. Without an index whose leading column is event_id the inner subquery falls back to scanning sqlite_autoindex_memory_completions_1, making the reconcile O(rows^2) — observed cost in production was ~171k rows read for one deletion against ~407 rows. With this covering index the inner becomes a seek and the reconcile drops to ~rows*log(rows).
8 lines
480 B
SQL
8 lines
480 B
SQL
-- Index on (event_id, completed_at DESC) for memory_completions.
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-- Speeds up the per-event "latest row" lookup used by the account-deletion
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-- reconcile in account.ts (the correlated subquery in
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-- INSERT INTO memory_events ... SELECT ... WHERE id = (SELECT id FROM mc2 ...)).
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-- Without this index that subquery is O(rows^2); with it, O(rows * log rows).
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CREATE INDEX IF NOT EXISTS idx_memory_completions_event_completed
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ON memory_completions(event_id, completed_at DESC);
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