[add]: Loan repayment event

app/models/account.py

@@ -1,6 +1,7 @@
 from datetime import datetime, timezone
 from sqlalchemy.orm import relationship
 from app.extensions import db
+from sqlalchemy.exc import IntegrityError
 
 class Account(db.Model):
     __tablename__ = 'accounts'
@@ -27,8 +28,13 @@ class Account(db.Model):
             customer_id=customer_id,
             account_type=account_type
         )
-        db.session.add(account)
-        db.session.commit()
+
+        try:
+            db.session.add(account)
+            db.session.commit()
+        except IntegrityError as err:
+            db.session.rollback()
+            raise ValueError(f"Database integrity error: {err}")
         return account
 
     @classmethod