CREATE TABLE IF NOT EXISTS alert_creation_requests (
    idempotency_key VARCHAR(255) PRIMARY KEY,
    request_hash CHAR(64) NOT NULL,
    alert_id INTEGER REFERENCES alerts(id) ON DELETE SET NULL,
    response_body JSONB,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE INDEX IF NOT EXISTS idx_alert_creation_requests_created_at
    ON alert_creation_requests(created_at);