Return transactuin is

app/models/transaction.py

@@ -4,13 +4,13 @@ from sqlalchemy.exc import IntegrityError
 
 class Transaction(db.Model):
     __tablename__ = 'transactions'
-    # id = db.Column(
-    #     db.Integer,
-    #     primary_key=True,
-    #     autoincrement=True,
-    # )
-    id = db.Column(db.String(50), primary_key=True)
-    #id = db.Column(db.String(50), nullable=False)
+    id = db.Column(
+        db.Integer,
+        primary_key=True,
+        autoincrement=True,
+    )
+    #id = db.Column(db.Int, primary_key=True)
+    transaction_id = db.Column(db.String(50), nullable=False)
     account_id = db.Column(db.String(50), nullable=False)
     type = db.Column(db.String(50), nullable=False)
     channel = db.Column(db.String(50), nullable=False)
@@ -23,11 +23,11 @@ class Transaction(db.Model):
     @classmethod
     def create_transaction(cls, id, account_id, type, channel):
 
-        if cls.query.filter_by(id=id).first():
+        if cls.query.filter_by(transaction_id=id).first():
             raise ValueError("Duplicate Transaction")
 
         transaction = cls(
-            id=id,
+            transaction_id=id,
             account_id=account_id,
             type=type,
             channel=channel