diff --git a/apps/backend/src/app/api/latest/analytics/events/batch/route.tsx b/apps/backend/src/app/api/latest/analytics/events/batch/route.tsx
index 7462ee527..4c02281b1 100644
--- a/apps/backend/src/app/api/latest/analytics/events/batch/route.tsx
+++ b/apps/backend/src/app/api/latest/analytics/events/batch/route.tsx
@@ -101,7 +101,7 @@ export const POST = createSmartRouteHandler({
       inserted: yupNumber().defined(),
     }).defined(),
   }),
-  async handler({ auth, body }, fullReq) {
+  async handler({ auth, body }) {
     if (!auth.tenancy.config.apps.installed["analytics"]?.enabled) {
       throw new KnownErrors.AnalyticsNotEnabled();
     }
@@ -134,41 +134,18 @@ export const POST = createSmartRouteHandler({
 
     const clickhouseClient = getClickhouseAdminClient();
 
-    // Server-side fallback: stamp the request's User-Agent into the event data
-    // blob when the client didn't already include one. This lets the analytics
-    // overview aggregate device/browser/OS breakdowns even for older clients.
-    const headerUserAgent = (() => {
-      const raw = fullReq.headers["user-agent"];
-      if (Array.isArray(raw)) return raw[0] ?? null;
-      return (raw as string | undefined) ?? null;
-    })();
-
-    const rows = body.events.map((event) => {
-      const rawData: unknown = event.data;
-      const isPlainObject = rawData != null && typeof rawData === "object" && !Array.isArray(rawData);
-      // Only stamp the fallback User-Agent onto object payloads; preserve any other
-      // (non-object) data as-is instead of dropping it.
-      let mergedData: unknown = rawData;
-      if (isPlainObject) {
-        const baseData = rawData as Record<string, unknown>;
-        const existingUa = baseData.user_agent;
-        mergedData = (existingUa == null || existingUa === "")
-          ? { ...baseData, user_agent: headerUserAgent }
-          : baseData;
-      }
-      return ({
-        event_type: event.event_type,
-        event_at: new Date(event.event_at_ms),
-        data: stripLoneSurrogates(mergedData),
-        project_id: projectId,
-        branch_id: branchId,
-        user_id: userId,
-        team_id: null,
-        refresh_token_id: refreshTokenId,
-        session_replay_id: recentSession?.id ?? null,
-        session_replay_segment_id: body.session_replay_segment_id,
-      });
-    });
+    const rows = body.events.map((event) => ({
+      event_type: event.event_type,
+      event_at: new Date(event.event_at_ms),
+      data: stripLoneSurrogates(event.data),
+      project_id: projectId,
+      branch_id: branchId,
+      user_id: userId,
+      team_id: null,
+      refresh_token_id: refreshTokenId,
+      session_replay_id: recentSession?.id ?? null,
+      session_replay_segment_id: body.session_replay_segment_id,
+    }));
 
     await clickhouseClient.insert({
       table: "analytics_internal.events",