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create the new entity
- save the action in the history log (django-simple-history)
- UUID is generated on database level
- Update
  - DateCreated (date)**
  - DateUpdated (date)**
  - UserUpdatedUUID (fk users)**
  - UserCreatedUUID (fk users)**
  - version = 1
- check that
  - DateValidFrom is not empty
update the fields for the entity to be replaced (ri)
- save the action in the history log (django-simple-history)
- check that the version save is still the same as the one in-memory
- update
  - DateUpdated (date)**
  - UserUpdatedUUID (fk users)**
  - version (+1)
  - DateValidTo set to DateValidFrom the new entity(ni) if ni.DateValidFrom < ri.DateValidTo or ri.DateValidTo is null
  - ReplacementUUID set to UUID of new entity (to be confirmed)