Commented out the recent `mailKey` spec and ran `storage adjust`:
```
$ ./bin/storage adjust --force
Verifying database schemata...
Found no adjustments for schemata.
Target Error
phabricator2_phriction.phriction_document.mailKey Column Has No Specification
SCHEMATA ERRORS
The schemata have serious errors (detailed above) which the adjustment
workflow can not fix.
If you are not developing Phabricator itself, report this issue to the
upstream.
If you are developing Phabricator, these errors usually indicate that your
schema specifications do not agree with the schemata your code actually
builds.
```