Error 500 on start-result service

[smadbe]

Today we got a 500 on the start-result service:

unexpected error: record not found, stack trace: goroutine 1 [running]:\nruntime/debug.Stack()\n\t/usr/local/go/src/runtime/debug/stack.go:24 +0x65\ngithub.com/France-ioi/AlgoreaBackend/v2/app/service.AppHandler.ServeHTTP.func1()\n\t/home/circleci/project/app/service/handler.go:34 +0x1ff\npanic({0xca4360, 0xc00015f9a0})\n\t/usr/local/go/src/runtime/panic.go:884 +0x213\ngithub.com/France-ioi/AlgoreaBackend/v2/app/database.(*DB).inTransactionWithCount.func1()\n\t/home/circleci/project/app/database/db.go:134 +0x219\npanic({0xca4360, 0xc00015f9a0})\n\t/usr/local/go/src/runtime/panic.go:884 +0x213\ngithub.com/France-ioi/AlgoreaBackend/v2/app/service.MustNotBeError(...)\n\t/home/circleci/project/app/service/errors.go:95\ngithub.com/France-ioi/AlgoreaBackend/v2/app/api/items.(*Service).startResult.func1(0xc000396c00)\n\t/home/circleci/project/app/api/items/start_result.go:128 +0x6a9\ngithub.com/France-ioi/AlgoreaBackend/v2/app/database.(*DataStore).InTransaction.func1(0xd2a8c0?)\n\t/home/circleci/project/app/database/data_store.go:226 +0x38\ngithub.com/France-ioi/AlgoreaBackend/v2/app/database.(*DB).inTransactionWithCount(0xc000289170, 0xc0004529d8, 0x0, {0x0?, 0x0, 0x0})\n\t/home/circleci/project/app/database/db.go:148 +0x24a\ngithub.com/France-ioi/AlgoreaBackend/v2/app/database.(*DB).inTransaction(...)\n\t/home/circleci/project/app/database/db.go:99\ngithub.com/France-ioi/AlgoreaBackend/v2/app/database.(*DataStore).InTransaction(0xc000452ab0, 0xc000452ac8, {0x0, 0x0, 0x0})\n\t/home/circleci/project/app/database/data_store.go:224 +0x105\ngithub.com/France-ioi/AlgoreaBackend/v2/app/api/items.(*Service).startResult(0xc0000a8120, {0x7f63bef62510, 0xc0002053c0}, 0xc0001fd000)\n\t/home/circleci/project/app/api/items/start_result.go:93 +0x385\ngithub.com/France-ioi/AlgoreaBackend/v2/app/service.AppHandler.ServeHTTP(0x100?, {0x7f63bef62510?, 0xc0002053c0?}, 0x0?)\n\t/home/circleci/project/app/service/handler.go:41 +0xc3\nnet/http.HandlerFunc.ServeHTTP(0xf2bea0?, {0x7f63bef62510?, 0xc0002053c0?}, 0xf22250?)\n\t/usr/local/go/src/net/http/server.go:2122 +0x2f\ngithub.com/France-ioi/AlgoreaBackend/v2/app/service.ParticipantMiddleware.func1.1({0x7f63bef62510, 0xc0002053c0}, 0xc0001fcf00)\n\t/home/circleci/project/app/service/participant.go:39 +0x27c\nnet/http.HandlerFunc.ServeHTTP(0xf274c0?, {0x7f63bef62510?, 0xc0002053c0?}, 0xc0002053c0?)\n\t/usr/local/go/src/net/http/server.go:2122 +0x2f\ngithub.com/France-ioi/AlgoreaBackend/v2/app/auth.UserMiddleware.func1.1({0x7f63bef62510?, 0xc0002053c0}, 0xc0001fce00)\n\t/home/circleci/project/app/auth/middleware.go:47 +0x16b\nnet/http.HandlerFunc.ServeHTTP(0xf2bea0?, {0x7f63bef62510?, 0xc0002053c0?}, 0x1477800?)\n\

[smadbe]

Got 11x the same crash on 22-23/10.