add jia_uuid index in isu_condition table

[budougumi0617]

https://portal.isucon.net/contestant/benchmark_jobs/3774

Marked At: 2021-08-21 11:43:46.504

Score: 10732

Score Breakdown: base=10734, deduction=2

まつゆきさんすげーーーーーーーーーーーーーー

[budougumi0617]

このslow queryみて直した。 https://github.com/budougumi0617/isucon11q/issues/1#issuecomment-903040375