-- Migration 154: add the mitigation UNIQUE/CHECK that the current code relies on.
-- The reconciled (consolidated) iace_mitigations lacked the constraints from
-- migrations 029/030, so CreateMitigation's `ON CONFLICT (hazard_id, name)`
-- failed (SQLSTATE 42P10) and no mitigations were created. Idempotent.

ALTER TABLE iace_mitigations
    DROP CONSTRAINT IF EXISTS iace_mitigations_hazard_name_uniq;
ALTER TABLE iace_mitigations
    ADD CONSTRAINT iace_mitigations_hazard_name_uniq UNIQUE (hazard_id, name);

CREATE INDEX IF NOT EXISTS idx_iace_mitigations_relevant
    ON iace_mitigations(hazard_id) WHERE is_relevant = TRUE;