fix(posthog): use traceparent header as canonical request_id source

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/home/hooks/use-chat.ts

@@ -1360,7 +1360,10 @@ export function useChat(
   const onRequestStartedRef = useRef(options?.onRequestStarted)
   onRequestStartedRef.current = options?.onRequestStarted
 
-  const getCurrentRequestId = useCallback(() => streamRequestIdRef.current, [])
+  const getCurrentRequestId = useCallback(() => {
+    const traceId = streamTraceparentRef.current?.split('-')[1] ?? ''
+    return /^[0-9a-f]{32}$/.test(traceId) ? traceId : undefined
+  }, [])
 
   const clearQueueDispatchState = useCallback(() => {
     queueDispatchEpochRef.current++

apps/sim/lib/posthog/server.ts

@@ -71,13 +71,14 @@ export function captureServerEvent<E extends PostHogEventName>(
     const client = getClient()
     if (!client) return
 
-    const requestId = getRequestContext()?.requestId
+    const contextRequestId = getRequestContext()?.requestId
+    const props = properties as Record<string, unknown>
     client.capture({
       distinctId,
       event,
       properties: {
-        ...(requestId ? { request_id: requestId } : {}),
         ...properties,
+        ...(contextRequestId && !('request_id' in props) ? { request_id: contextRequestId } : {}),
         ...(options?.groups ? { $groups: options.groups } : {}),
         ...(options?.set ? { $set: options.set } : {}),
         ...(options?.setOnce ? { $set_once: options.setOnce } : {}),