From 3dbae2d278b122908c351aa9f961ef90a9f82d7e Mon Sep 17 00:00:00 2001
From: Eric Lammertsma <e.lammertsma@gmail.com>
Date: Fri, 20 Feb 2026 09:37:49 -0500
Subject: [PATCH] feat: add PostHog last_seen_at property

---
 surfsense_web/instrumentation-client.ts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/surfsense_web/instrumentation-client.ts b/surfsense_web/instrumentation-client.ts
index e6b346073..0193b2754 100644
--- a/surfsense_web/instrumentation-client.ts
+++ b/surfsense_web/instrumentation-client.ts
@@ -12,6 +12,15 @@ if (process.env.NEXT_PUBLIC_POSTHOG_KEY) {
 		capture_pageview: "history_change",
 		// Enable session recording
 		capture_pageleave: true,
+		before_send: (event) => {
+			if (event.properties) {
+				event.properties.$set = {
+					...event.properties.$set,
+					last_seen_at: new Date().toISOString(),
+				};
+			}
+			return event;
+		},
 		loaded: (posthog) => {
 			// Expose PostHog to window for console access and toolbar
 			if (typeof window !== "undefined") {