CREATE TABLE text_messages (
    id VARCHAR(64) PRIMARY KEY DEFAULT uuid_generate_v4(),
    source_user_id VARCHAR(64) REFERENCES users(id) ON DELETE CASCADE,
    target_user_id VARCHAR(64) REFERENCES users(id) ON DELETE CASCADE,
    message TEXT NOT NULL,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
);