Unable to compose the AddListener node to DataChange event firebase


here is my data structure

I would like to point the modifications at the level of m1, m2 etc
how to know that it is m1 or m2 or mx which has been modified?
users work at “mx” level and i use addlistener chronos/build/house1 (for example)

when a user modifies for example m1 of house1 on the device of another user who works on m2 it is “updated” whereas it is m1 which has been modified
can we do better?
can i change dynamically the addlistener ?

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