Akka.Persistence.Sql.Common.Journal.SqlJournal is using a single CancellationToken for all db-operations, that is only disposed on shutdown, if I understand the code correcly. This indirectly keeps references to all SqlCommands, which again have references to connections and so on, preventing GC. I believe this can be fixed with creating a new CancellationTokenSource with CreateLinkedTokenSource for each command, however I am not quite sure why the implementation is as it is, so I would like to have some feedback from the developers before I fix it and create a pullrequest.