Way to improve this

get_matches_for_status_matched

@classmethod
def get_matches_for_status_matched(klass, ride_doc):
    ride=[]
 
    # first ensure status is matched
    if ride_doc.get(Ride.A_STATUS) != 2: return ride

    # get the match ride and user info
    match_ride_id = ride_doc.get(Ride.A_MATCH_ID) 
    if not match_ride_id: return ride

    match_ride = klass.get_ride(match_ride_id)     
    if not match_ride: return ride

    user_id = match_ride_id.get(klass.A_USER_ID)     
    if not user_id: return ride

    user_doc = UserHelper.get_users_by_id(user_id)
    if not user_doc: return ride
            
    # link the 
    if user_doc:
        match_ride["user"]=user_doc
        ride = match_ride
	
    return ride

This is one quick improvement - less nested.
Each time you do 'return ride', you could instead raise a specific error if you wanted to (later)