So i'm getting this error:

[at.pcgamingfreaks.MarriageMasterStandalone.libs.com.zaxxer.hikari.pool.HikariPool]: MarriageMaster-Connection-Pool - Thread starvation or clock leap detected (housekeeper delta=46s426ms304µs149ns).

like once per hour. It causes really big lagg on server, sometimes even kicking the players.

That error is caused by the lagg. Whatever caused the lagg also caused the housekeeping thread of the database connection pool to run late.

Alright, so I believe that it's not the plugin's fault, thanks