CREATE TABLE brand_question_versions (
    id            BIGSERIAL PRIMARY KEY,
    question_id   BIGINT NOT NULL REFERENCES brand_questions(id),
    question_text TEXT NOT NULL,
    question_hash VARCHAR(64) NOT NULL,
    version_no    INT NOT NULL,
    is_active     BOOLEAN NOT NULL DEFAULT true,
    created_at    TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT uk_question_version_no UNIQUE (question_id, version_no)
);
CREATE INDEX idx_question_hash ON brand_question_versions(question_hash);