ALTER TABLE quote_comparisons
    ADD COLUMN IF NOT EXISTS recommended_vendor TEXT,
    ADD COLUMN IF NOT EXISTS score DOUBLE PRECISION,
    ADD COLUMN IF NOT EXISTS normalized_total DOUBLE PRECISION;

ALTER TABLE quote_execution_receipts
    ADD COLUMN IF NOT EXISTS skill_name TEXT,
    ADD COLUMN IF NOT EXISTS status TEXT,
    ADD COLUMN IF NOT EXISTS input_hash TEXT,
    ADD COLUMN IF NOT EXISTS result_hash TEXT;