Update User and Role so they have a proper __repr__ method

app/models.py

@@ -38,7 +38,7 @@ class User(db.Model, UserMixin):
                             secondary=users_roles,
                             backref=db.backref('users', lazy='dynamic'))
 
-    def __str__(self):
+    def __repr__(self):
         return f'<User {self.id}({self.username})>'
 
 
@@ -51,3 +51,6 @@ class Role(db.Model, RoleMixin):
 
     #: A description of the role
     description = db.Column(db.UnicodeText)
+
+    def __repr__(self):
+        return f'<Role {self.id}({self.name})>'