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SQLite databases on Android devices are very stable by definition. However, we have an experience 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 map file or map deletes itself. Luckily sometimes it is possible to repair such a corrupted database.
Following steps require working with the command line.
echo .dump | sqlite3.exe name_of_map.sqlitedb > name_of_map_dump.sql
sqlite3.exe -init name_of_map_dump.sql name_of_map_fixed.sqlitedb