change add/update behaviour

[ax1]

Before: by default add unless filter or id

Now: this is not intuitive. When dealing with objects or log files, always force to search by key, otherwise add it to the database. For plain texts as "set" arrays it would be useful to add them and automatic replace

then:

• asses insert/upsert to change for another specific method fit for the above arrays
• clean behavior, no side cases, reduce documentation and cases (as db, as log read append, as persistent array, and nothing else)