diff --git a/src/app/api/local-coding/sync/route.ts b/src/app/api/local-coding/sync/route.ts
index 6b444d7f4..673ba61bc 100644
--- a/src/app/api/local-coding/sync/route.ts
+++ b/src/app/api/local-coding/sync/route.ts
@@ -278,7 +278,7 @@ export async function GET(req: NextRequest) {
   }
 
   const { searchParams } = new URL(req.url);
-  const rawDays = parseInt(searchParams.get("days") || "30", 10);
+  const rawDays = parseInt(searchParams.get("days", 10) || "30", 10);
   const days = validateDays(isNaN(rawDays) ? DEFAULT_DAYS : rawDays);
   const fromDate = new Date();
   fromDate.setDate(fromDate.getDate() - days);
diff --git a/src/app/api/metrics/contributions/hourly/route.ts b/src/app/api/metrics/contributions/hourly/route.ts
index 6c8740c62..ffdf11c98 100644
--- a/src/app/api/metrics/contributions/hourly/route.ts
+++ b/src/app/api/metrics/contributions/hourly/route.ts
@@ -19,7 +19,7 @@ export async function GET(req: NextRequest) {
 
   const daysParam = req.nextUrl.searchParams.get("days");
   const parsedDays = daysParam ? parseInt(daysParam, 10) : NaN;
-  const days = isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
+  const days = Number.isNaN(parsedDays) ? 30 : Math.max(1, Math.min(365, parsedDays));
   const bypass = isMetricsCacheBypassed(req);
   const key = metricsCacheKey(
     session.githubId ?? session.githubLogin,
diff --git a/src/app/api/metrics/productive-hours/route.ts b/src/app/api/metrics/productive-hours/route.ts
index 5bb62d383..839a900c4 100644
--- a/src/app/api/metrics/productive-hours/route.ts
+++ b/src/app/api/metrics/productive-hours/route.ts
@@ -223,7 +223,7 @@ export async function GET(req: NextRequest) {
   } else {
     const daysParam = searchParams.get("days");
     const parsedDays = daysParam ? parseInt(daysParam, 10) : NaN;
-    days = isNaN(parsedDays) ? 90 : Math.max(1, Math.min(365, parsedDays));
+    days = Number.isNaN(parsedDays) ? 90 : Math.max(1, Math.min(365, parsedDays));
   }
 
   const accountId = searchParams.get("accountId");
diff --git a/src/app/api/metrics/repo-analytics/route.ts b/src/app/api/metrics/repo-analytics/route.ts
index caf5e0946..a7a3fb6c4 100644
--- a/src/app/api/metrics/repo-analytics/route.ts
+++ b/src/app/api/metrics/repo-analytics/route.ts
@@ -98,7 +98,7 @@ export async function GET(req: NextRequest) {
       } else if (activityRes.ok) {
         const activityData = await activityRes.json();
         if (Array.isArray(activityData) && activityData.length > 0) {
-          const lastWeek = activityData[activityData.length - 1];
+          const lastWeek = activityData.at(-1);
           const days: number[] = lastWeek.days || [];
           // `lastWeek.week` is a Unix timestamp (seconds) for the Sunday that starts the bucket.
           // Derive labels from it so they always match the actual calendar days GitHub recorded.