CREATE TABLE IF NOT EXISTS users (
    id SERIAL PRIMARY KEY,
    google_id VARCHAR(255) UNIQUE NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    name VARCHAR(255),
    profile_picture TEXT,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

CREATE TABLE IF NOT EXISTS files (
    id SERIAL PRIMARY KEY,
    user_id INTEGER REFERENCES users(id) ON DELETE CASCADE,
    filename VARCHAR(255) NOT NULL,
    original_name VARCHAR(255) NOT NULL,
    s3_key TEXT NOT NULL,
    file_size BIGINT,
    file_type VARCHAR(100),
    uploaded_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    share_token VARCHAR(64) UNIQUE
);