[add]: ref_id and ref_model for transactions. And db session and rollback for transactions

app/models/account.py

@@ -31,9 +31,7 @@ class Account(db.Model):
 
         try:
             db.session.add(account)
-            db.session.commit()
         except IntegrityError as err:
-            db.session.rollback()
             raise ValueError(f"Database integrity error: {err}")
         return account