CleanupOldIdempotencyEntries deletes the commands in idempotency folder after persistenceTimeout minutes.

CreateIdempotencyDirectory creates idempotency directory and logs warn message if could not be created This function passes if the directory is already present.

CreateIdempotencyEntry writes command id to the idempotency directory.

IsDocumentAlreadyReceived checks whether the document was received already.

Name represents idempotency name.