Scenario: Go to https://phabricator.haskell.org. We have a default Dashboard installed to the homepage, and at the top panel there is a `Recent Updates` tab, containing another text panel, with a changelog inside.
Editing this text panel to refer to a commit in a Diffusion repository (rFOOxyz) as part of a changelog results in an exception being thrown: `Transaction type 'core:edge' is missing an internal apply implementation!` when I attempt to save the changes.
Full stack trace below:
```lang=txt
2014/10/26 06:07:33 [error] 32226#0: *362 FastCGI sent in stderr: "PHP message: [2014-10-26 01:07:33] EXCEPTION: (Exception) Transaction type 'core:edge' is missing an internal apply implementation! at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:484]
PHP message: #0 PhabricatorApplicationTransactionEditor::applyCustomInternalTransaction(PhabricatorDashboardPanel, PhabricatorDashboardPanelTransaction) called at [<phabricator>/src/applications/dashboard/editor/PhabricatorDashboardPanelTransactionEditor.php:73]
PHP message: #1 PhabricatorDashboardPanelTransactionEditor::applyCustomInternalTransaction(PhabricatorDashboardPanel, PhabricatorDashboardPanelTransaction) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:383]
PHP message: #2 PhabricatorApplicationTransactionEditor::applyInternalEffects(PhabricatorDashboardPanel, PhabricatorDashboardPanelTransaction) called at [<phabricator>/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php:686]
PHP message: #3 PhabricatorApplicationTransactionEditor::applyTransactions(PhabricatorDashboardPanel, array) called at [<phabricator>/src/applications/dashboard/controller/PhabricatorDashboardPanelEditController.php:168]
PHP message: #4 PhabricatorDashboardPanelEditController::processRequest() called at [<phabricator>/src/aphront/AphrontController.php:33]
PHP message: #5 AphrontController::handleRequest(AphrontRequest) called at [<phabricator>/webroot/index.php:103]" while reading response header from upstream, client: 173.245.50.166, server: phabricator.haskell.org, request: "POST /dashboard/panel/edit/14/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "phabricator.haskell.org"
2014/10/26 06:07:33 [error] 32226#0: *362 FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught exception 'Exception' with message 'Process exited with an open transaction! The transaction will be implicitly rolled back. Calls to openTransaction() must always be paired with a call to saveTransaction() or killTransaction().' in /opt/libphutil/src/aphront/storage/connection/AphrontDatabaseTransactionState.php:69
Stack trace:
#0 [internal function]: AphrontDatabaseTransactionState->__destruct()
#1 {main}
thrown in /opt/libphutil/src/aphront/storage/connection/AphrontDatabaseTransactionState.php on line 69" while reading upstream, client: 173.245.50.166, server: phabricator.haskell.org, request: "POST /dashboard/panel/edit/14/ HTTP/1.1", upstream: "fastcgi://unix:/var/run/php5-fpm.sock:", host: "phabricator.haskell.org"
```