fix time table

app/models/reservation.py

@@ -27,6 +27,11 @@ class Reservation(db.Model):
     created_at = db.Column(db.DateTime, default=datetime.utcnow)
     updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
     
+# Relationships
+    classroom = db.relationship('Classroom', backref=db.backref('reservation_list', lazy=True, cascade='all, delete-orphan'))
+    commission = db.relationship('Commission', backref=db.backref('reservation_list', lazy=True, cascade='all, delete-orphan'))
+    # User already defines the relationship back to reservation
+    
     def to_dict(self):
         """Convert reservation to dictionary"""
         return {

app/models/subject.py

@@ -61,8 +61,8 @@ class Commission(db.Model):
     def is_active(self, value):
         self.active = value
     
-    # Relationships
-    reservations = db.relationship('Reservation', backref='commission', lazy=True, cascade='all, delete-orphan')
+# Relationships
+    pass  # Reservation already defines the relationship back to commission
     teacher = db.relationship('User', backref='teaching_commissions', foreign_keys=[teacher_id])
     
     # Virtual field for teacher_name