Can the user use the email as a key to store data in our firebase database
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Ok （1）you can use sign in mode ( Need to enable escrow ）and set firebase rules:
{ "rules": { ".read": "auth.uid != null", ".write": "auth.uid != null" } }
use UID
(2) key cannot use “@” or “.”
replace “@” to &1 and “.” to &2
Email cannot use & - % #
Key cannot use @ .
(3) only use @gmail.com
Get text before@
Use the Sign-In component to validate Email. The sign-in component will generate a unique ID for each email. Use this UID in your RTDB.
thank you so much that’s a really good idea I will try it out and get back to you tomorrow…
Thank you
i think im gonna go for replacing the text option rather than getting the text before @gmail.com 
If you only allow gmail to log in
Get "example"@gmail.com