Adding a Firebase Extension to a Jetpack Compose app

The eighth installment in an Android app development series introduces Firebase Extensions through the example of adding the Delete User Data Extension to the Jetpack Compose-based Make It So to-do app. Firebase Extensions are configurable, pre-packaged backend solutions that reduce the need to build and maintain common features, such as automatically resizing uploaded images or deleting user-related data. The Delete User Data Extension is triggered when a Firebase Authentication account is removed and can delete associated information from Cloud Firestore, Cloud Storage, and Realtime Database, improving on a previous client-side deletion approach that could be interrupted by connectivity problems or app failures. The extension can be configured either to discover Firestore documents containing a user ID field, such as tasks with a userId property, or to remove data at specified paths such as users/{UID}, including nested subcollections through recursive deletion. Installation occurs in the Firebase console, requires a Blaze billing plan, and involves reviewing APIs, created resources, permissions, and data-matching settings; once configured, the app can remove its own task-deletion code and rely on a more reliable backend process.

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