From your logs, I’m not seeing any corruption.
I am, however, seeing a lot of old issues which were corrected in subsequent releases of PMS. 1.15.2 has undergone many corrections.
I recommend you consider updating to current Public release version.
I implemented several changes with 1.15.4.994 on Synology and would like to make certain you are aware and can make these minor changes to your Synology before upgrading.