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Connect the database directly with the app, see fot example App Inventor Tutorials and Examples: MySQL | Pura Vida Apps
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Write a procedure, which checks the database, use the notification style extension to send the notification and get it running in the foreground first
- Try the itoo extension, read the complete thread and try the examples to learn how the extension works
- Get it running in the background. For questions about itoo ask in the itoo thread and provide a screenshot of what you tried
Taifun