fix(15min-settlement): render slot import and export separately - #291
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…r as net Under Sweden's 15-min settlement model, import_wh and export_wh accumulate as independent registers within a slot — the bill is import_wh × import_price + export_wh × export_price never their net. The dashboard's "15m" badge was rendering ImportWh - ExportWh as a single signed value, which silently hides the operator's true settlement-window exposure: a slot that imported 156 Wh and exported 17 Wh got summarised as +139 Wh, making it indistinguishable from a slot that imported 139 Wh and exported nothing. Render both directions: "15m ↑156 Wh ↓17 Wh". The badge tints import-red or export-green based on which dominates. API: keep `net_wh` for backwards compatibility but document it as observational — consumers must NOT bill against the net. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Summary
Under 15-min settlement (Svk), import and export accumulate as independent registers within a slot — the bill is
import_wh × import_price + export_wh × export_price, never their net. The dashboard's "15m" badge was renderingImportWh - ExportWhas a single signed value, silently hiding the operator's true settlement-window exposure.Reported live (2026-05-24): a slot showing "15m +139 Wh" was actually
import_wh=156, export_wh=17— these are billed independently and netting them is wrong.Changes
web/next-app.js— badge renders15m ↑156 Wh ↓17 Wh; tints to import-red or export-green based on which direction dominates.go/internal/api/api.go— keepnet_whin the response for backwards compat but document it as observational only; never bill against it.state/cost.goalready integrates per-direction correctly — no change there.Test plan
go test ./internal/api/ -count=1🤖 Generated with Claude Code