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ALTER TABLE
    common_third_parties
ADD
    COLUMN enrichment_requested_at TIMESTAMP WITH TIME ZONE,
ADD
    COLUMN enrichment JSONB,
ADD
    COLUMN enrichment_attempts INTEGER NOT NULL DEFAULT 0;

-- The DEFAULT only backfills existing rows; drop it so inserts must
-- supply the value explicitly.
ALTER TABLE
    common_third_parties
ALTER COLUMN
    enrichment_attempts DROP DEFAULT;

-- Partial index backs the enrichment worker's claim query, which polls
-- only rows currently queued for enrichment.
CREATE INDEX common_third_parties_enrichment_requested_at_idx
    ON common_third_parties (enrichment_requested_at)
    WHERE enrichment_requested_at IS NOT NULL;