Add dto to avoid annoying exceptions

[SirNoob97]

These types of exceptions occur when trying to persist a new client that is coming with posts, this can easily be fixed with a dto, or I can change the logic of the service layer.

org.postgresql.util.PSQLException: ERROR: null value in column "client_id" violates not-null constraint

[kgotlelelo-cmd]

When I was testing I realised that users cannot have the same bio that needs to be fixed