I tried to purge some observed hand history, after about 1 hour an error window pop up and shows:
There was an error during the Purge: A timeout has occured. If you were establishing a connection, increase Timeout value in ConnectionString. If you were executing a command, increate the CommandTimeout value in ConnectionString or in your NpgsqlCommand object.
I don't know how to resolve the problem.
PS: I uploaded the Log file.