Ongoing enhancements

sustApp/mail_payment_slips.py

@@ -1,6 +1,6 @@
 from sqlalchemy import extract
-from database import engine, SessionLocal
-import models
+from sustApp.models.database import engine, SessionLocal
+import sustApp.models.models as models
 import logging, sys
 import smtplib
 from email.mime.multipart import MIMEMultipart