perf(api,frontend): index hot queries, paginate chats, fix realtime

frontend/src/lib/format/presence.ts

@@ -1,10 +1,22 @@
 import type { PresenceSample } from "$lib/api/types";
 import { formatListDate } from "$lib/format/datetime";
 
+export function isOnline(sample: PresenceSample | null): boolean {
+  if (sample === null || sample.status !== "online") {
+    return false;
+  }
+  if (sample.next_offline_date === null) {
+    return false;
+  }
+  return new Date(sample.next_offline_date).getTime() > Date.now();
+}
+
 export function formatPresence(sample: PresenceSample): string {
   switch (sample.status) {
     case "online":
-      return "online";
+      return isOnline(sample)
+        ? "online"
+        : lastSeen(sample.last_online_date ?? sample.ts);
     case "recently":
       return "last seen recently";
     case "last_week":
@@ -15,7 +27,11 @@ export function formatPresence(sample: PresenceSample): string {
       return "last seen a long time ago";
     default:
       return sample.last_online_date
-        ? `last seen ${formatListDate(sample.last_online_date)}`
+        ? lastSeen(sample.last_online_date)
         : "offline";
   }
 }
+
+function lastSeen(date: string): string {
+  return `last seen ${formatListDate(date)}`;
+}