CREATE TABLE IF NOT EXISTS notifications (
    id          CHAR(36) NOT NULL DEFAULT (UUID()),
    user_id     CHAR(36) NOT NULL,
    title       VARCHAR(255) NOT NULL,
    message     TEXT NOT NULL,
    type        ENUM('info','success','warning','error') NOT NULL DEFAULT 'info',
    is_read     TINYINT(1) NOT NULL DEFAULT 0,
    created_at  DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    INDEX idx_notif_user (user_id),
    CONSTRAINT fk_notif_user FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;