06/03 Optimize codes, fix transactions import functions

app/routes/transactions.py

@@ -221,6 +221,18 @@ def edit(id):
                            title='Edit Transaction')
 
 
+@transactions_bp.route('/<int:id>/set-category', methods=['POST'])
+@login_required
+def set_category(id):
+    """AJAX endpoint: update only the category of a transaction."""
+    txn = db.get_or_404(Transaction, id)
+    data = request.get_json(silent=True) or {}
+    raw = data.get('category_id')
+    txn.category_id = int(raw) if raw else None
+    db.session.commit()
+    return jsonify({'ok': True, 'category_id': txn.category_id})
+
+
 @transactions_bp.route('/<int:id>/delete', methods=['POST'])
 @login_required
 def delete(id):