How to merge contents of SQLite 3.7 WAL file into main database file

From the command line, do this:

1. sqlite3 MyDatabase.sqlite
2. VACUUM;
3. CTRL-D to exit the sqlite console.

Done!

The -wal file should now have a size of 0 and everything should be in your main database file.

Do a checkpoint, i.e., execute PRAGMA wal_checkpoint.