CREATE TABLE refresh_tokens (
    token_id   UUID PRIMARY KEY,
    user_id    UUID NOT NULL REFERENCES users(id),
    token_hash TEXT NOT NULL,
    expires_at TIMESTAMPTZ NOT NULL,
    revoked    BOOLEAN NOT NULL DEFAULT FALSE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX idx_refresh_tokens_user ON refresh_tokens(user_id);