By default the flowable wars use an H2 database stored in a folder called flowable-db in your home folder. You can delete this folder wholesale if you want to start over, but it will delete any models you have in modeler as well. You can also open Flowable-Admin and delete the offending processes/instances. In real wold usage, you’d want to keep your delegates around until all instances that use them are finished. There is also an experimental process migration feature that will let you migrate processes from an older version to a new version.
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