chat.Service.ExecuteStream was a long-standing cost-ledger gap: the
agentic loop accumulated token counts via stream callbacks (see
GetTotalInputTokens / GetTotalOutputTokens in agentic_control.go)
and surfaced them in the SSE done envelope to the frontend, but
nothing on the server side recorded a cost.UsageEvent. Patrol,
discovery, QuickAnalysis, and the report narrators all record; only
chat — the bulk of AI token spend — did not. The operator's AI
usage dashboard was therefore understating cost dramatically.
Found while extending the cost-recording mindset across subpackages
after fixing QuickAnalysis (08491b9f4). Initially spawned as a
separate task but the right shape and scope became clear, so landing
it directly here.
Pipeline:
- Service.CostStore() exposes the per-tenant cost store handle.
- chat.Config gains optional CostStore *cost.Store field, threaded
into chat.Service.costStore at NewService time.
- chat.Service.recordChatTurnCost records a UsageEvent with
UseCase="chat" after every loop.ExecuteWithTools return (success
OR error — operator was billed regardless of clean response).
Skips when costStore is nil or zero tokens accumulated.
- ai_handler.go's two chatCfg construction sites populate CostStore
via h.resolveCostStore(ctx).
- router wires the resolver to AISettingsHandler.GetAIService(ctx).CostStore()
with no Enabled gate — even brief chat usage while AI was being
configured should appear in the dashboard.
ExecutePatrolStream is deliberately not changed. It creates a
separate tempLoop and its caller (patrol_ai.go) records cost via
its own helper at line 887. Recording in ExecuteStream only avoids
double-counting on the patrol-via-chat path.
Tests in chat/cost_recording_test.go cover: recording when store
configured, no-op when store nil, no-op on zero tokens (early
failures), graceful handling of model strings missing the
provider prefix.
a0b3bc7ed3