so why don't you just do that?
why do you work with valueIfTagNotThere = "true"?
your screenshot from yesterday looked much better...
the first block should be to get the main list from TinyDB and assign it to the list variable
then you can check, if the list is empty and do the further processing
btw, you do not need the ClearTag block, if you save data in a tag, which is already stored in TinyDB, the data will be overwritten
Taifun