Low memory causes SqliteException

[Erhannis]

There's an intermittent bug recorded at #136 , wherein trying to use the app gives frequent "SqliteException(1032): while executing statement, attempt to write a readonly database". I think I've found the problem - the app creates directory /data/user/0/net.e1547/cache/e1547 , and starts putting cache files in there, but when the device memory (disk space) is low, the OS will frequently (like, every handful of seconds) clear the cache directory /data/user/0/net.e1547/cache , deleting the e1547 directory, and causing subsequent cache attempts to throw exceptions. Preferably, the app would detect this and either recreate the cache files whenever needed, or at least give the user a clear message explaining the situation. I actually had to free up more than ~2GB before the app started working again.

To Reproduce

1. Fill your device memory with arbitrary files.
2. Attempt to use the app (specifically, open the app, then click on several tags and expect errors.)

Expected behavior

Either the app recreates the cache repeatedly, or falls back to a different solution (in-memory cache?), or gives a useful error message.

Platform

• Device: Samsung Galaxy XCover Pro
• OS: Android
• Version 13

Logs

(I no longer have the logs or the error, but I posted my previous ones in #136 )

[Erhannis]

Possibly there could be a setting to store the cache in a non-cache folder, if the user didn't want to clear up space but still wanted the app to work?