android thinks accounts.db is corrupted and deletes it

After a reboot, i lost all my accounts. i looked into the logcat and got: 04-02 11:54:01.535 5305 8068 E SQLiteLog: (11) statement aborts at 24: [SELECT key, value FROM extras WHERE accounts_id=(select _id FROM accounts WHERE name=? AND type=?)] database disk image is malformed 04-02 11:54:01.537 5305 8068 E DefaultDatabaseErrorHandler: Corruption reported by sqlite on database: /data/system/users/0/accounts.db 04-02 11:54:01.538 5305 8068 E DefaultDatabaseErrorHandler: deleting the database file: /data/system/users/0/accounts.db I restored the file completely from a TitaniumBackup XML-file (so the database is created cleanly again, no backup of a possible corrupt db file). After a reboot, android deletes it again and recreates it, accessing it just after restoring (i.e. using a program, which looks up an account) gives the message 04-02 11:45:22.855 12225 12225 W System.err: Caused by: java.lang.IllegalStateException: The database '/data/system/users/0/accounts.db' is not open. just after restore, i can open my accounts.db with `sqlite3 and SELECT * FROM ACCOUNTS returns a correct list and SELECT key, value FROM extras` works as expected, too. The file permissions are -rw-rw---- 1 system system 72K 2017-04-02 11:55 accounts.db -rw------- 1 system system 17K 2017-04-02 11:55 accounts.db-journal My ROM is a CyanogenMod 13.