fix

apps/api/internal/aiaudit/aiaudit.go

@@ -54,9 +54,12 @@ type Call struct {
 	Error        string
 	FinishReason string
 	PromptTokens int
-	OutputTokens int
-	TotalTokens  int
-	Duration     time.Duration
+	// CachedPromptTokens is the cached subset of PromptTokens — billed far cheaper,
+	// so cost accounting must know about it.
+	CachedPromptTokens int
+	OutputTokens       int
+	TotalTokens        int
+	Duration           time.Duration
 }
 
 // CallContext is the per-call metadata processing/campaigns attach to ctx before
@@ -110,6 +113,9 @@ type Recorder struct {
 
 	mu     sync.Mutex
 	failed bool // stop log-spamming once writes are known to fail
+
+	// prices caches ai_model_prices for cost rollup (see cost.go).
+	prices priceCache
 }
 
 // NewRecorder returns a Recorder writing to pool. nil pool yields a no-op recorder.
@@ -170,6 +176,9 @@ func (r *Recorder) Record(ctx context.Context, c Call) {
 	if err != nil {
 		r.noteFailure(err)
 	}
+	// Roll the same call into the durable daily cost aggregate. ai_call_logs is
+	// pruned after a week; spend has to survive for years (see cost.go).
+	r.recordUsage(ctx, c)
 }
 
 func (r *Recorder) noteFailure(err error) {