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SQLite databases on Android devices are very stable by definition. However, we have experienced that databases can be corrupted. This may be due to wrong closing the database or killing Locus app. The result is that Locus Map is not able open the database file or the file deletes itself - this concerns both map files and points/track databases, all are SQLites. Luckily sometimes it is possible to repair such a corrupted database.
Following steps require working with the command line.
$ sqlite3 mydata.db ".dump" | sqlite3 new.db
However, this is not always possible. The easiest and most reliable way is to restore the database file from the backup.