Database DDL Schema to Mermaid ERD Studio

CREATE TABLE users (
    id UUID PRIMARY KEY,
    email VARCHAR(255) UNIQUE NOT NULL,
    created_at TIMESTAMPTZ DEFAULT NOW()
);

CREATE TABLE subscriptions (
    id UUID PRIMARY KEY,
    user_id UUID REFERENCES users(id),
    plan_tier VARCHAR(50) NOT NULL,
    status VARCHAR(20) NOT NULL
);

CREATE TABLE invoices (
    id UUID PRIMARY KEY,
    subscription_id UUID REFERENCES subscriptions(id),
    amount_cents INT NOT NULL
);