completed authentication system

db.py

@@ -1,4 +1,5 @@
 from flask_sqlalchemy import SQLAlchemy
+from flask_login import UserMixin
 
 db = SQLAlchemy()
 
@@ -36,7 +37,7 @@ class Event(db.Model):
         return f'<Event "{self.id}">'
 
 
-class User(db.Model):
+class User(UserMixin, db.Model):
     id = db.Column(db.Integer, primary_key=True)
     userName = db.Column(db.String(1000))
     email = db.Column(db.String(100), unique=True)