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ARTEX/db/migrations/0003_task_scope_icp_index.sql
BaaRai 30c787d690 perf(db): batch coverage-graph lookups and index icp scope probes
BuildCoverageGraph issued one QueryRow per connector root domain and one per company: 221 statements for a task scoped by 800 subdomains over 200 roots and 20 companies. Fetch them with one ANY() query each. The coverage target join probes task_scope once per asset, and the icp branch fell back to uq_task_scope_v2 with only kind as index condition; migration 0003 adds a partial index on task_scope(value) for icp rows. Large-fixture invariants test and benchmark included.
2026-11-14 21:16:49 +01:00

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-- The coverage target CTE (contextCoverageCTE / covTargetCTE / scopeTargetCTE)
-- joins assets to task_scope on an OR of per-kind predicates. PostgreSQL plans it
-- as one BitmapOr probe of task_scope per asset. Every branch had an index except
-- kind='icp', which fell back to uq_task_scope_v2 with only "kind = 'icp'" as the
-- index condition (task_id is the leading column), so each probe walked the
-- whole unique index: about 70% of the buffer hits of the coverage-graph query on
-- a 3,000-asset task scoped by 800 subdomains. This partial index makes the icp
-- probe an equality lookup on value.
CREATE INDEX IF NOT EXISTS idx_ts_icp ON task_scope(value) WHERE kind = 'icp';