CREATE TABLE IF NOT EXISTS payments (
    id         BIGSERIAL PRIMARY KEY,
    customer   TEXT        NOT NULL,
    amount     BIGINT      NOT NULL,
    currency   CHAR(3)     NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

-- Used only when idempotency.store=postgres.
CREATE TABLE IF NOT EXISTS idempotency_keys (
    idem_key        TEXT PRIMARY KEY,
    fingerprint     CHAR(64)    NOT NULL,
    status          TEXT        NOT NULL,
    response_status INT,
    content_type    TEXT,
    response_body   TEXT,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
    expires_at      TIMESTAMPTZ NOT NULL
);
CREATE INDEX IF NOT EXISTS idempotency_keys_expires_at ON idempotency_keys (expires_at);