* moves migration paths to the migration_types module
* moves USER_VERSION to the migration_types module
* updates migration execution condition to cover the peer store
* adds a message to the store if it is inserted to the db
* adds debug messages and checks migration path recursively
* deletes unused debug messages
* deletes commented codes
* clean up
* fixes a bug
* renames the first migration file of the message store
Sanaz Taheri Boshrooyeh