From Json to DB V7

app.py

@@ -65,16 +65,26 @@ def db_to_json():
     }
 
 def json_to_db(data):
+    try:
         db.session.query(Attendance).delete()
-    db.session.query(GuestName).delete()
-    db.session.query(Date).delete()
-    db.session.query(Player).delete()  # <-- Clear players so we can import new ones
         db.session.commit()
+        db.session.query(GuestName).delete()
+        db.session.commit()
+        db.session.query(Date).delete()
+        db.session.commit()
+        db.session.query(Player).delete()
+        db.session.commit()
+    except Exception as e:
+        db.session.rollback()
+        print("Error during deletion:", e)
+        raise
+
     # Insert players from JSON
     for name in data.get("players", []):
         db.session.add(Player(name=name))
     db.session.commit()
-    # Now continue with dates, attendance, guest names as before...
+
+    # Insert dates and attendance
     for date_str in data.get("dates", []):
         date = Date(date_str=date_str)
         db.session.add(date)
@@ -93,6 +103,7 @@ def json_to_db(data):
             db.session.add(GuestName(date_id=date.id, name=guest_name))
     db.session.commit()
 
+
 @app.route('/')
 def index():
     return render_template('index.html')