Node-red multi-user workaround

[Colin]

@Lupin_III

No, the users can only view it.
One of the problem I'm encountering is the database. There are several devices in different place with internet access and each device has to modify its own table inside the database

Those statements appear to be contradictory. You say the user only views the database, then you say he has to modify the database.
Whatever the situation is, if you use mqtt to communicate back to the main node-red server then the data update can be done there, locally to node-red.