/mpt directory: what's for?

I have this /mpt dir in root of my D802 running stock KK 4.4.2

here is ls -l output

-rw-rw---- system system 24576 2014-12-26 15:48 MPT_Basic.bdb
-rw-rw---- system system 118784 2015-05-12 15:53 MPT_CommonData.db
-rw-rw---- system system 16384 2015-05-07 17:49 MPT_IncallData.db
-rw-rw---- system system 8945664 2015-05-12 15:53 MPT_MainData.db
-rw-rw-rw- system system 40960 2016-04-28 06:51 MPT_MainData.db-shm
-rw-rw-rw- system system 173072 2015-05-12 15:53 MPT_MainData.db-wal
-rw------- system system 2 1970-01-02 01:00 enable
drwx------ root root 1970-01-01 01:00 lost+found
-rw------- system system 5 2015-05-12 08:01 pid
-rw------- system system 2 2015-05-11 08:04 started

As you can see mostly db files, modified more than 1 year ago, bar 'MPT_MainData.db-shm', modified some days ago (attached with txt extension, 40 kb).
I checked .db files with SQL, contain references to stock lg apps, but also whatsapp, SuperSu and few other apps installed by me.
'MPT_MainData.db' is nearly 9 megs in size.

Anyone has this dir too? Do you know what is for? Is it safe to delete?

Attached Files

MPT_MainData.db.shm.txt - [Click for QR Code] (40.0 KB)

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