import sqlite3

def initialize_db():
    conn = sqlite3.connect('tokens.db')
    cursor = conn.cursor()

    cursor.execute('''
    CREATE TABLE IF NOT EXISTS password_reset_tokens (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        email TEXT NOT NULL,
        token TEXT NOT NULL,
        created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
    )
    ''')

    conn.commit()
    conn.close()