Integrate Sails backend with Firebase

z-waka is a mobile-first electronic medical platform connecting patients and doctors. We started to integrate a Firebase-based instant messaging feature into our app. Therefore, we have following backend structure: - Firebase for instant messaging - Sails for all other backend-related things. The backend database system is Postgresql. In order to complete the integration between mobile frontend and backend, we will need following adjustments: - Create communication between Sails and Firebase - Add some Firebase-specific columns in the patient and doctor tables in the Postgresql database - Every time a user is created in the Sails backend, the backend shall create a Firebase user and add Firebase-specific information into the Postgresql database - There are different ways how a user can be created in the backend. - Every time patient or doctor information is updated in Postgresql, Firebase needs to be udpdated as well - When the mobile application requests for a list of doctors or patients through the API, a script shall check if the Postgresql database has already Firebase user information. If not, the script shall create a Firebase user - The API needs to be upgrade to give back additionally Firebase user information stored in Postgresql