'session_fields' : []

[vingorius]

as document, it means "Include all", but not work.

app.config['SESSION_CONFIG'] = [
# Second session will store the user logged in inside the firestore sessions collection.
{
'cookie_name': 'SESS_ID',
'session_type': 'firestore',
'session_fields': [],
'client': firestore.Client(),
'collection': 'sessions',
},
]