Hello, Do you happen to know what might be a reason of failing connection to DB on local setup?

Could not connect to address=(host=localhost)(port=3306)(type=master) : Socket fail to connect to host:localhost, port:3306. Connection refused: connect
java.net.ConnectException: Connection refused: connect.

as @nutritious-angle-64267 had a similar issue maybe his solutions helps:

docker/sdk clean-data
docker/sdk up --data
docker/sdk console q:w:s -v -s

and then try connecting again

Do you already have another mysql instance running ?

No I do not. Interesting is that in case I'm switching to postgress, I can connect.