SQL Server database size

[hsmarkusschweitzer]

Describe the bug
WorkflowCore 3.13.0
WorkflowCore.QueueProviders.SqlServer 3.13.0
WorkflowCore.Persistence.SqlServer 3.13.0

Our SQL Server db size increased nearly 30 times in one day (from some MB to 5 GB).

This are the stats of our current DB:

Regarding the queues: The only queue containing items is "//workflow-core/workflowQueue" with 2k entries.

The only thing I discovered is that there are 6mio conversations (Is this normal?).

To Reproduce

1. Create a simple workflow application
2. Start 10 - 40 workflows
3. Let it run for a day
4. Check db

Expected behavior
Consistent database size that is not increasing if nothing happens (or at least not 33 times)

UPDATE: After deleting them with END CONVERSATION xxx WITH CLEANUP, and shrinking the db, it got back to its normal size.