I made a very large change to one of our repositories, essentially running `git mv some/subdir/* ./`. Locally, I had two commits: one which did the `git mv` and a subsequent commit which fixed up any path references. I wanted to get this change code reviewed to some extent, so I did `arc diff HEAD~` to submit a revision for review. Upon landing this change, I am now no longer able to view the revision in the web UI. Specifically, I get a "maximum execution time" error. Setting `debug.time-limit` to 20 seconds, I get the following trace:
```
Request aborted by debug time limit after 20 seconds.
STACK TRACE
LiskDAO.php:609 PhabricatorStartup->onDebugTick()
LiskDAO.php:655 LiskDAO->loadFromArray()
DifferentialChangesetQuery.php:56 LiskDAO->loadAllFromArray()
PhabricatorPolicyAwareQuery.php:227 DifferentialChangesetQuery->loadPage()
DifferentialRevisionViewController.php:699 PhabricatorPolicyAwareQuery->execute()
DifferentialRevisionViewController.php:81 DifferentialRevisionViewController->loadChangesetsAndVsMap()
AphrontController.php:33 DifferentialRevisionViewController->processRequest()
AphrontApplicationConfiguration.php:226 AphrontController->handleRequest()
AphrontApplicationConfiguration.php:140 AphrontApplicationConfiguration->processRequest()
index.php:21 AphrontApplicationConfiguration->runHTTPRequest()
```