Android application dev needs a hint about some offline map issue

[serialrf433]

I am using https://github.com/torlando-tech/columba
The app is using MapLibre and have a offline map downloader build into it. This makes it possible to download the map data, turn phone into offline mode and use it all the time offline.
Sadly after some time passes something at the map database is breaking. The developer needs a hint what could be the reason for this.

This is how it can be used:
When you open the map in the application, it is downloading and caching the map data from the internet while you are using the map.
When you go into the build in map downloader, it is downloading the map tiles and when the download have finished, you can turn off the http map download. When you then browse the map even when the phone is connected to the internet, it does not download the map data any more. The area stay empty when it is not part of what you have download for offline usage.

And this is how it breaks:
It is working great this way until at some later time the whole map break. There is nothing special i can do to force breaking the map. It just happens at some later time. The world-map background changes. It is not any more the classic OSM based map. It is then some world-map with really low resolution where you can see the mountains on the map. When i see this basic map, i can try to zoom into the offline map area as much as i want. It does not work any more.

Does someone have any hint for the developer at what could be happening in the background causing this error?

[louwers]

The database for offline tiles is shared with the cache. That's probably where your problems come from, but without more details it will be hard to look into it.

You can inspect the database file to see what is going on. It is a relatively simple SQLite database.

[serialrf433]

When i enable the HTTP map downloader, the broken state moves away from the generic map with the mountains to the typical one and it is downloading again the map data. But the offline map that was downloaded before seems to be still gone. When i zoom into this area when going offline again, it does not show any detailed map data like it does when it is working.

Where can i find this SQLite database? Does it have a typical place and a typical name?