training fix. add global settings

backend/models/TrainingSize.py

@@ -0,0 +1,25 @@
+from database.database import db
+
+class TrainingSize(db.Model):
+    """Size configurations for training (3NF - replaces JSON arrays)"""
+    __tablename__ = 'training_size'
+    
+    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
+    training_id = db.Column(db.Integer, db.ForeignKey('training.id', ondelete='CASCADE'), nullable=False)
+    size_type = db.Column(db.String(50), nullable=False)  # 'input_size', 'test_size', 'mosaic_scale', 'mixup_scale'
+    value_order = db.Column(db.Integer, nullable=False, default=0)  # Order in array (0=first, 1=second)
+    value = db.Column(db.Float, nullable=False)
+    
+    # Composite key ensures proper ordering
+    __table_args__ = (
+        db.UniqueConstraint('training_id', 'size_type', 'value_order', name='uq_training_size'),
+    )
+    
+    def to_dict(self):
+        return {
+            'id': self.id,
+            'training_id': self.training_id,
+            'size_type': self.size_type,
+            'value_order': self.value_order,
+            'value': self.value
+        }