CREATE TABLE quota_reservations (
    id              BIGSERIAL PRIMARY KEY,
    tenant_id       BIGINT NOT NULL REFERENCES tenants(id),
    quota_type      VARCHAR(50) NOT NULL,
    resource_type   VARCHAR(50) NOT NULL,
    resource_id     BIGINT NOT NULL,
    reserved_amount INT NOT NULL,
    consumed_amount INT NOT NULL DEFAULT 0,
    refunded_amount INT NOT NULL DEFAULT 0,
    status          VARCHAR(20) NOT NULL DEFAULT 'pending',
    expire_at       TIMESTAMPTZ NOT NULL,
    created_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at      TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT chk_quota_reservation_status
        CHECK (status IN ('pending', 'confirmed', 'refunded', 'reset'))
);
CREATE INDEX idx_quota_reservation_tenant_status ON quota_reservations(tenant_id, status);