Everything looks good. Yes, when you clear the database it will take up to 6 intervals (hours) to totally complete a database background sync. This is a safety precaution to avoid bogging down lower powered devices and potentially impact performance (or locking the database for extended periods of time). To make up for that real time updates are enabled. This means as you browse Mezzmo it will sync anything which hasn't been caught yet by the background processing. Once sync is achieved the addon disables real time syncing since it is no longer needed. This slightly improves browsing speed since database checking is eliminated once real time sync is disabled. The addon will do all of this automatically.
The last thing the sync process does is once a day between midnight and 6AM it does a full resync. It clears the Mezzmo data from Kodi and rebuilds everything at one time and then disables real time syncing. It does this to get rid of old Mezzmo records which may have been deleted and ensures sync between Kodi and Mezzmo. If you have dupe checking enabled it will also tell you where you have duplicate entries in your Mezzmo database. I can see a few above in your logs. Typically they look like:
2020-11-17 17:22:23.809 T:3738170176 NOTICE: There was a Mezzmo metadata change detected: GOPR0035
2020-11-17 17:22:23.810 T:3738170176 NOTICE: There was a Mezzmo streamdetails or artwork change detected: GOPR0035
2020-11-17 17:22:23.810 T:3738170176 NOTICE: Mezzmo streamdetails artwork rowcount = : 4
It is saying it saw the same name twice GOPR0035 and either the metadata or the stream details (i.e. audio, video or container format) are different. The first time folks use the addon this is typical and after some cleanup it is a nice way to help keep your Mezzmo database clean.
Jeff
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