Ref T13048. This migration is from January 2012 and probably only impacted Facebook.
It references HeraldRepetitionPolicyConfig, which I'd like to change significantly. I initially just replaced the constant with a literal 0, but I don't think there's any actual value in retaining this migration nowadays.
The cost of removing this migration is: if you installed Phabricator before January 2012 and haven't upgraded since then, you'll have a few more rows in the APPLIED table than necessary. Herald will still work correctly.