I have been using MySql for a few decades now and have just inherited a code base which uses FireBase, of which I have zero previous experience.
My first thought is to look at the database schema, to see how it all hangs together. In SQL terminology, I would look at the "tables" (nodes in FB?) and find "foreign keys" which are indices into to other tables.
For instance the "orders" table/node has an entry for "user_id", which is obviously an index into the "users" table/node.
I am prepared to do this manually, and generate a diagram which I can use for personal reference and for the documentarian. For MySql, there are many tools which will reverse engineer the database and spit out such a diagram.
Is there something analogous for Firebase? Preferably Windows base, but web based is also acceptable. In fact, I wonder if this ability is built into Firebase somewhere and I am misplay unaware of it.