first commit

app/models/customer.py

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+from datetime import datetime, timezone
+from sqlalchemy.orm import relationship
+from app.extensions import db
+from app.models.account import Account
+from sqlalchemy.exc import IntegrityError
+
+class Customer(db.Model):
+    __tablename__ = 'customers'
+
+    id = db.Column(db.String(50), primary_key=True) 
+    msisdn = db.Column(db.String(20), unique=True, nullable=False)
+    country_code = db.Column(db.String(3), nullable=False)
+    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_valid_customer(cls, customer_id):
+        customer = cls.query.filter_by(id=customer_id).first()
+        if not customer:
+            return False
+        return True
+
+    @classmethod
+    def create_customer(cls, id, msisdn, country_code, account_id, account_type='savings'):
+        if cls.query.filter_by(id=id).first():
+            raise ValueError("Customer already exists")
+        
+        # Create the customer
+        customer = cls(id=id, msisdn=msisdn, country_code=country_code)
+        try: 
+            db.session.add(customer)
+            
+            # Create an associated account
+            account = Account.create_account(
+                id=account_id,
+                customer_id=id,
+                account_type=account_type
+            )
+            
+            db.session.commit()
+        except IntegrityError as err:
+            db.session.rollback()
+            raise ValueError(f"Database integrity error: {err}")
+        return customer
+
+    def __repr__(self):
+        return f'<Customer {self.id}>'