'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', }, ]