06/02 Modified transaction, remember filtered criteria, page after editing a transaction

app/routes/transactions.py

@@ -188,6 +188,11 @@ def edit(id):
         form.account_id.data = str(txn.account_id)
         form.category_id.data = str(txn.category_id) if txn.category_id else ''
 
+    next_url = request.form.get('next') or request.args.get('next', '')
+    # Only allow relative URLs to prevent open-redirect
+    if not next_url.startswith('/'):
+        next_url = ''
+
     if form.validate_on_submit():
         old_account_id = txn.account_id
         txn.transaction_type = active_type
@@ -204,12 +209,13 @@ def edit(id):
         if txn.transaction_type == 'expense':
             from app.services.alert_service import check_and_flash_budget_alerts
             check_and_flash_budget_alerts(flash)
-        return redirect(url_for('transactions.index', tab=txn.transaction_type))
+        return redirect(next_url or url_for('transactions.index', tab=txn.transaction_type))
 
     return render_template('transactions/form.html',
                            form=form,
                            txn=txn,
                            txn_type=active_type,
+                           next_url=next_url,
                            income_cats=_category_choices_json('income'),
                            expense_cats=_category_choices_json('expense'),
                            title='Edit Transaction')