Constant MIGRATION_015 

const MIGRATION_015: &str = r#"
-- App-wide settings table for device ID and other app-level configuration
-- Device ID is a unique identifier for this app installation
-- Required for Jellyfin server communication and session tracking
CREATE TABLE IF NOT EXISTS app_settings (
    key TEXT PRIMARY KEY,
    value TEXT NOT NULL,
    updated_at TEXT DEFAULT CURRENT_TIMESTAMP
);

-- Create index for efficient lookups (though key is already primary key)
CREATE INDEX IF NOT EXISTS idx_app_settings_key ON app_settings(key);
"#;

Migration to add device ID storage

• Creates app_settings table for app-wide configuration (device ID, etc.)
• Device ID is generated once and persisted for Jellyfin server identification