[ui] mark each visited entity with a LAST_VISITED timestamp

webui/src/components/Inspect.svelte

@@ -4,7 +4,7 @@
   import UpObject from "./display/UpObject.svelte";
   import { UpType } from "../lib/types";
   import BlobPreview from "./display/BlobPreview.svelte";
-  import { setContext } from "svelte";
+  import { onMount, setContext } from "svelte";
   import { writable } from "svelte/store";
   import type { UpEntry } from "upend";
   import Spinner from "./utils/Spinner.svelte";
@@ -86,7 +86,7 @@
   }
 
   $: filteredUntypedAttributes = untypedAttributes.filter(
-    (entry) => !["IS", "LBL", "NOTE"].includes(entry.attribute)
+    (entry) => !["IS", "LBL", "NOTE", "LAST_VISITED"].includes(entry.attribute)
   );
 
   $: currentUntypedAttributes = editable
@@ -161,6 +161,14 @@
     await fetch(`/api/obj/${address}`, { method: "DELETE" });
     revalidate();
   }
+
+  onMount(() => {
+    fetch(`/api/obj/${address}/LAST_VISITED`, {
+      method: "PUT",
+      headers: { "Content-Type": "application/json" },
+      body: JSON.stringify({ t: "Number", c: new Date().getTime() }),
+    });
+  });
 </script>
 
 <div class="inspect">