Last few days were trying to manage my Firebase Realtime Database from node-red. So installed the node-red-contrib-firebase, what a disaster, crashed all my test flows. But the alarm bells should have rung as it were last maintained 5 years back (How do we get these out date nodes banned?)
As I only had 3/4 of my test flows backed up, I had to rebuild them before I have forgotten what they were. 
Then I created the flow below to mange my database.
You need to replace [PROJECT_ID] with your DB link.
PUT data into Firestore Realtime Database, this will delete all existing
recorders from that specific field and these records in the field
The URL in the http request is:
https://[PROJECT_ID].firebaseio.com/devices.json
Get all data from Firestore Realtime Database
The URL in the http request is:
https://[PROJECT_ID].firebaseio.com/devices.json
Patch data to Firestore Realtime Database
This is the same as adding a recorded to your database.
The URL in the http request is:
https://[PROJECT_ID].firebaseio.com/devices.json
The a msg.method of PATCH as the standard http node does not support it
Delete data to Firestore Realtime Database
With this you can delete a recorded from your data base
The URL in the http request is:
https://[PROJECT_ID].firebaseio.com/devices.json/devices/77764BB5A6B5F88.json
Update This is the same as adding a recorded to your database, but we are updating a recorded
The URL in the http reqest is:
https://[PROJECT_ID].firebaseio.com/devices/77764BB5A6B5F55.json
The msg. have a msg.method of PATCH as the standard http node does not support it
Delete all data from Firestore Realtime Database
With this you can delete a recorded from your data base
The URL in the http request is:
https://[PROJECT_ID].firebaseio.com/devices.json
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WARNNING this post can be edit at any time 
