[add]: Loan charges model

app/models/__init__.py

@@ -3,5 +3,6 @@ from .account import Account
 from .loan import Loan
 from .transaction import Transaction
 from .repayment import Repayment
+from .loan_charge import LoanCharge
 
-__all__ = ['Customer', 'Account', 'Loan', 'Transaction', 'Repayment']
+__all__ = ['Customer', 'Account', 'Loan', 'Transaction', 'Repayment', 'LoanCharge']

app/models/loan.py

@@ -4,7 +4,7 @@ from app.models.customer import Customer
 from app.models.account import Account
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm import relationship
-from app.models import Customer
+from app.models import Customer, Loa
 
 
 class Loan(db.Model):

app/models/loan_charge.py

@@ -1,5 +1,6 @@
 from datetime import datetime, timezone
 from app.extensions import db
+from app.models import LoanCharge
 from sqlalchemy.orm import relationship
 
 
@@ -25,6 +26,7 @@ class LoanCharge(db.Model):
     )
 
  
+
     def to_dict(self):
         return {
             'id': self.id,