* repo for checkins

* repo for checkins

* renamed param

* added more crud methods

* added fields from new specs version

* fixed ktlint issue

* fixed class hierarchy

* fixed UnnecessaryAbstractClass

* fixed nullable types

* renamed to Event* to TraceLocation* to be in sync with spec

* moved database one package level up

* use app scope for insert

* renamed const

* convert data between repo and database

* removed interface for data class, renaming, housekeeping

* entity is no parcel anymore

* + update method in checkin repo