How to Update SECRET_KEY
Run the following snippet to create a Fernet Key and set SECRET_KEY to it.
from cryptography.fernet import Fernet
fernet_key = Fernet.generate_key()
print(fernet_key.decode()) # your fernet_key, keep it in a secure place!
Note
At this time, changing SECRET_KEY after data sources have been added will cause connections to them to fail. Secret rotation is on the roadmap.