I'm using this library for a home automation system which uses SQLite for storing and retrieving device states and control data. I have a few tables, I'm using indexes + begin transaction/commit for those I often do queries with. The system runs on ESP32-CAM and stores db on SD-card. The db has a few tables and has indexes for frequently queried data.

The database often gets corrupted, this error usually occurs during a SELECT query (but I bet the malformation has happened without noticing before that during an INSERT or UPDATE). I've written my own SQLite execute -wrapper function based on the examples provided, this handles interlocking (makes sure that simultanious operations or other SD-card operations for ie. web server shouldn't happen). I've done the same for the callback function for easy retrieval of data for the rest of the code.

I'm not getting other errors such as out of memory etc. It's almost always the same table that gets corrupted, it now has about 100k rows in it and the size of the whole db is about ~5MB. Looking at the corrupt db with SQLite Browser, it seems the latest ~50 rows are malformed and I can export the rest to .sql file and import it back into a db. I've tried two different SD-cards so I don't think it's related to those either. I also had the problems when db size was less than half of the current size.

What should I look at next?