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CREATE TABLE users ( id SERIAL PRIMARY KEY, username TEXT NOT NULL UNIQUE ); CREATE TABLE roles ( id SERIAL PRIMARY KEY, name TEXT NOT NULL UNIQUE ); CREATE TABLE user_roles ( user_id INTEGER NOT NULL, role_id INTEGER NOT NULL, PRIMARY KEY (user_id, role_id), FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE, FOREIGN KEY (role_id) REFERENCES roles(id) ON DELETE CASCADE, );

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