training fix. add global settings

backend/models/ProjectClass.py

@@ -0,0 +1,23 @@
+from database.database import db
+
+class ProjectClass(db.Model):
+    """Class definitions for training projects (3NF)"""
+    __tablename__ = 'project_class'
+    
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    project_id = db.Column(db.Integer, db.ForeignKey('training_project.project_id', ondelete='CASCADE'), nullable=False)
+    class_name = db.Column(db.String(255), nullable=False)
+    display_order = db.Column(db.Integer, default=0)
+    
+    # Unique constraint: one class name per project
+    __table_args__ = (
+        db.UniqueConstraint('project_id', 'class_name', name='uq_project_class'),
+    )
+    
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'project_id': self.project_id,
+            'class_name': self.class_name,
+            'display_order': self.display_order
+        }