CREATE TABLE IF NOT EXISTS app_config (
    `key` VARCHAR(64) PRIMARY KEY,
    `value` TEXT NOT NULL,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT IGNORE INTO app_config (`key`, `value`) VALUES ('app_version', '1.0.1');
INSERT IGNORE INTO app_config (`key`, `value`) VALUES ('apk_url', '/sysadmin.apk');
INSERT IGNORE INTO app_config (`key`, `value`) VALUES ('force_update', '0');
INSERT IGNORE INTO app_config (`key`, `value`) VALUES ('release_notes', '• Initial release\n• Server management\n• SSH terminal');

CREATE TABLE IF NOT EXISTS notifications (
    id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    user_id INT UNSIGNED DEFAULT NULL,
    title VARCHAR(255) NOT NULL,
    message TEXT NOT NULL,
    type ENUM('info','warning','success','error') NOT NULL DEFAULT 'info',
    is_read TINYINT(1) NOT NULL DEFAULT 0,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    read_at DATETIME DEFAULT NULL,
    INDEX idx_user_id (user_id),
    INDEX idx_is_read (is_read),
    INDEX idx_created_at (created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;