CREATE TABLE IF NOT EXISTS rag_retrieval_trace (
    trace_id uuid PRIMARY KEY,
    query_text text NOT NULL,
    subject_scope text NOT NULL,
    query_intent text NOT NULL,
    decision text NOT NULL,
    reason text NOT NULL,
    resolved_drug_id text,
    citations jsonb NOT NULL DEFAULT '[]'::jsonb,
    created_at timestamptz NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS rag_retrieval_trace_created_at_idx
    ON rag_retrieval_trace (created_at DESC);