fix: suppress noisy cost/req alerts below $5/req and format values properly

Add absolute $/req floor (default $5) to skip alerts on normal thinking
model costs. Fix Slack and email alerts showing raw cents instead of
formatted dollar amounts for cost_per_req metric.

Made-with: Cursor

Author: ofershap

src/app/settings/settings-client.tsx

@@ -202,6 +202,27 @@ export function SettingsClient({ config: initial }: SettingsClientProps) {
             hint={config.trends.costPerReqMinSpendCents === 0 ? "disabled" : "skip low spenders"}
             unit="cents"
           />
+          <Field
+            label="Min $/req to alert"
+            value={config.trends.costPerReqMinAbsoluteCents}
+            onChange={(v) =>
+              setConfig({
+                ...config,
+                trends: { ...config.trends, costPerReqMinAbsoluteCents: v },
+              })
+            }
+            suffix={
+              config.trends.costPerReqMinAbsoluteCents > 0
+                ? `$${(config.trends.costPerReqMinAbsoluteCents / 100).toFixed(0)}/req`
+                : undefined
+            }
+            hint={
+              config.trends.costPerReqMinAbsoluteCents === 0
+                ? "disabled"
+                : "skip unless $/req exceeds this"
+            }
+            unit="cents"
+          />
           <div className="text-[10px] text-zinc-600 space-y-0.5 mt-1">
             <p>
               Compares today&apos;s average cost per request against the user&apos;s historical

src/lib/alerts/email.ts

@@ -11,6 +11,8 @@ function formatValue(metric: string, value: number): string {
   switch (metric) {
     case "spend":
       return `$${(value / 100).toFixed(2)}`;
+    case "cost_per_req":
+      return `$${(value / 100).toFixed(2)}/req`;
     case "tokens":
       return `${(value / 1_000_000).toFixed(2)}M tokens`;
     case "requests":

src/lib/alerts/slack.ts

@@ -19,6 +19,8 @@ function formatValue(metric: string, value: number): string {
   switch (metric) {
     case "spend":
       return `$${(value / 100).toFixed(2)}`;
+    case "cost_per_req":
+      return `$${(value / 100).toFixed(2)}/req`;
     case "tokens":
       return `${(value / 1_000_000).toFixed(2)}M`;
     case "requests":

src/lib/anomaly/trends.ts

@@ -19,6 +19,7 @@ export function detectTrendAnomalies(config: DetectionConfig): Anomaly[] {
     cycleOutlierMultiplier,
     costPerReqSpikeMultiplier,
     costPerReqMinSpendCents,
+    costPerReqMinAbsoluteCents,
   } = config.trends;
 
   detectSpendSpikes(anomalies, now, spendSpikeMultiplier, spendSpikeLookbackDays);
@@ -28,6 +29,7 @@ export function detectTrendAnomalies(config: DetectionConfig): Anomaly[] {
     now,
     costPerReqSpikeMultiplier,
     costPerReqMinSpendCents,
+    costPerReqMinAbsoluteCents,
     spendSpikeLookbackDays,
   );
 
@@ -115,6 +117,7 @@ function detectCostPerReqSpikes(
   now: string,
   spikeMultiplier: number,
   minSpendCents: number,
+  minAbsoluteCents: number,
   lookbackDays: number,
 ): void {
   if (spikeMultiplier <= 0) return;
@@ -123,6 +126,7 @@ function detectCostPerReqSpikes(
 
   for (const user of users) {
     if (user.today_spend_cents < minSpendCents) continue;
+    if (minAbsoluteCents > 0 && user.today_cost_per_req < minAbsoluteCents) continue;
     if (!user.hist_avg_cost_per_req || user.hist_avg_cost_per_req <= 0) continue;
     if (user.hist_days < 3) continue;
 

src/lib/types.ts

@@ -394,6 +394,7 @@ export interface DetectionConfig {
     cycleOutlierMultiplier: number;
     costPerReqSpikeMultiplier: number;
     costPerReqMinSpendCents: number;
+    costPerReqMinAbsoluteCents: number;
   };
   cronIntervalMinutes: number;
   enableInfoAnomalies: boolean;
@@ -414,6 +415,7 @@ export const DEFAULT_CONFIG: DetectionConfig = {
     cycleOutlierMultiplier: 10,
     costPerReqSpikeMultiplier: 3,
     costPerReqMinSpendCents: 2000,
+    costPerReqMinAbsoluteCents: 500,
   },
   cronIntervalMinutes: 60,
   enableInfoAnomalies: false,