I would like to limit the rate of data reads per user from the Realtime Database. There are good ways to limit writes like described here but I can't find any solution on how to limit data reads.
Can this be done with Security Rules, Cloud Functions or can I limit it somewhere in the Firebase account? I have checked the documentation but can't find the answer.
This applies to both Realtime Database and Firestore, except with different terminology. (Location == document)
You won't be able to do this without also writing some value at a location in the database every time a read is performed. You can't write a location in a security rule, and you can't force the client to write at the same time as a read.
Even if you were able to write a location in a rule to use in a rate limit, you would then have to read that location for every read that must be limited, and that kind of defeats the purpose of a rate limit (since they could continue to try to read a restricted location in a way that just causes more reads to happen).
