[add]: Kafka Integration

app/models/customer.py

@@ -1,4 +1,5 @@
 from datetime import datetime, timezone
+from sqlalchemy.orm import relationship
 from app.extensions import db
 from app.models.account import Account
 
@@ -11,6 +12,13 @@ class Customer(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.now(timezone.utc))
     updated_at = db.Column(db.DateTime, default=datetime.now(timezone.utc), onupdate=datetime.now(timezone.utc))
 
+    accounts = relationship(
+        "Account",
+        primaryjoin="Customer.id == Account.customer_id",
+        foreign_keys="Account.customer_id",
+        back_populates="customer",
+    )
+
     @classmethod
     def is_eligible(cls, customer_id):
         customer = cls.query.filter_by(id=customer_id).first()