Fix regression from #3975

[chadwhitacre]

https://sentry.io/gratipay/gratipay-com/issues/185206514/

gratipay/inside.gratipay.com#900 (comment)

[chadwhitacre]

This doesn't indicate actual data corruption, and it isn't affecting user experience, so I'm going to leave this sit for now (not self-merge). I will hopefully see about a test or two after supper.

[chadwhitacre]

CHECK_DB_EVERY is set to 10 minutes in production.

[chadwhitacre]

So I expect 6 or 7 more entries in Sentry when I get back. :-)

[chadwhitacre]

Actually, this may go deeper. I'm struggling to get a test together.

[chadwhitacre]

I'm looking at a local backup, finding some patterns ... not all balances are failing the check, for one.

[chadwhitacre]

I've whittled down to a failing case with the fewest exchanges.

[chadwhitacre]

Okay, I think I've got it. transfers are selected (or payments?) but not the exchanges to offset them.

[chadwhitacre]

Alright! Ready to go. :-)

cc: @kaguillera @rohitpaulk @aandis @nobodxbodon @JessaWitzel et al.

[kaguillera]

LGTM...I have no complaints
If no one else has any concerns by Friday I will merge.

[clone1018]

Looks good to me.

[clone1018]

Updating branch (with GitHub) and waiting for tests. I remember us talking about rebasing instead but I'm not setup for that right now

[clone1018]

ok I merged and deleted the branch.