From 99e81a289e26f3fd93e80b9e63c8283a5dff3e58 Mon Sep 17 00:00:00 2001 From: lingniu Date: Wed, 8 Jul 2026 14:35:20 +0800 Subject: [PATCH] docs: add task 3 report --- .superpowers/sdd/task-3-report.md | 50 +++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 .superpowers/sdd/task-3-report.md diff --git a/.superpowers/sdd/task-3-report.md b/.superpowers/sdd/task-3-report.md new file mode 100644 index 00000000..e62f8629 --- /dev/null +++ b/.superpowers/sdd/task-3-report.md @@ -0,0 +1,50 @@ +# Task 3 Report: Final Mileage Election Projector + +## Outcome + +Implemented `ProjectDailyMileage` in `go/vehicle-gateway/internal/stats/source_mileage.go` and added focused projector coverage in `go/vehicle-gateway/internal/stats/source_mileage_test.go`. + +## RED + +Before implementation, the new projector test failed as expected because the function did not exist yet: + +```text +internal/stats/source_mileage_test.go:87:9: undefined: ProjectDailyMileage +``` + +That confirmed the test was exercising the missing task-3 surface rather than passing accidentally. + +## GREEN + +After implementation: + +- `go test ./internal/stats -run TestProjectDailyMileageSelectsCandidateAndMarksSource -count=1` +- `go test ./internal/stats -count=1` + +Both passed. + +## What Changed + +- Added `maxSelectedDailyMileageKM = 1000`. +- Added `ProjectDailyMileage(...)` with three SQL steps: + - clear `is_selected` for the VIN/date/protocol slice, + - project the elected row from `vehicle_daily_mileage_source` into `vehicle_daily_mileage`, + - mark the winning source row as selected. +- Kept the candidate identity intact: `source_key` still carries protocol + phone/device + source IP, while the data-source join uses protocol + source IP. +- Added a focused test that asserts the clear/project/mark sequence and the key SQL fragments. + +## Files Changed + +- `go/vehicle-gateway/internal/stats/source_mileage.go` +- `go/vehicle-gateway/internal/stats/source_mileage_test.go` + +## Self-Review + +- The projector stays aligned with the existing stats schema and helper conventions. +- The SQL ordering and join logic preserve the intended source identity split; there is no IP-only simplification. +- I did not add an unrelated schema migration because the current repository state already contained the needed `vehicle_daily_mileage_source` and `vehicle_daily_mileage` columns/indexes for this projector. +- The only notable follow-up risk is that the final selection query relies on MySQL-style `INSERT ... SELECT ... LIMIT 1 ON DUPLICATE KEY UPDATE` behavior, which matches the rest of the stats package but should still be exercised against the target DB in an integration run. + +## Commit + +`aa12317b5` - `feat(stats): project elected mileage source`