CREATE TABLE IF NOT EXISTS workspace_billing (
    workspace_id       UUID PRIMARY KEY REFERENCES workspace(id) ON DELETE CASCADE,
    balance            DECIMAL(20, 4) NOT NULL DEFAULT 0,
    currency           VARCHAR(10)    NOT NULL DEFAULT 'USD',
    monthly_quota      DECIMAL(20, 4) NOT NULL DEFAULT 0,
    total_spent       DECIMAL(20, 4) NOT NULL DEFAULT 0,
    updated_at         TIMESTAMPTZ    NOT NULL,
    created_at         TIMESTAMPTZ    NOT NULL
);