Converting working now perfectly, it is really a helpful addition. I reported an issue with the earlier version, the author responded fast, and fixed the issue.

I love your quest plugin, but this conversion plugin is just not working at all. Placed in the plugin, restarted the server, then typed /qconvert playerdata yaml mysql. Still, conversion is taking forever, and in practice its doing nothing at all.
Even though mysql is set up correctly, because the rows are created.

I'm happy to change my rating after issue is resolved.

[17:43:17] [Server thread/INFO]: [QuestsConverter] SytheX started conversion from YAML to MySQL
[17:43:17] [ForkJoinPool.commonPool-worker-7/WARN]: [ForkJoinPool.commonPool-worker-7] INFO me.blackvein.quests.libs.hikari.HikariDataSource - quests-hikari - Starting...
[17:43:17] [ForkJoinPool.commonPool-worker-7/WARN]: [ForkJoinPool.commonPool-worker-7] INFO me.blackvein.quests.libs.hikari.HikariDataSource - quests-hikari - Start completed.