[update]: Database schema

app/models/customer.py

@@ -1,15 +1,14 @@
-from datetime import datetime
+from datetime import datetime, timezone
 from app import db
 
 class Customer(db.Model):
     __tablename__ = 'customers'
-    __table_args__ = {'schema': 'flask_app'} 
 
     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.utcnow)
-    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    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))
 
     @classmethod
     def is_eligible(cls, customer_id):