feat: Update how messages load and sync, allow plugins to import messages

toju-app/src/app/store/messages/messages-incoming.handlers.ts

@@ -289,6 +289,12 @@ async function processSyncBatch(
   attachments: AttachmentFacade
 ): Promise<Message[]> {
   const toUpsert: Message[] = [];
+  // Yield to the event loop every YIELD_EVERY messages so Angular change
+  // detection and user input aren't starved while a large sync batch
+  // (e.g. from a bulk plugin import) drains serial DB writes.
+  const YIELD_EVERY = 50;
+
+  let processed = 0;
 
   for (const incoming of event.messages) {
     attachments.rememberMessageRoom(incoming.id, incoming.roomId);
@@ -305,6 +311,12 @@ async function processSyncBatch(
 
     if (changed)
       toUpsert.push(message);
+
+    processed += 1;
+
+    if (processed % YIELD_EVERY === 0) {
+      await new Promise<void>((resolve) => setTimeout(resolve, 0));
+    }
   }
 
   if (hasAttachmentMetaMap(event.attachments)) {
@@ -603,13 +615,20 @@ function handleSyncRequest(
   return from(
     (async () => {
       const all = await db.getMessages(targetRoomId, FULL_SYNC_LIMIT, 0);
-      const syncFullEvent: ChatEvent = {
-        type: 'chat-sync-full',
-        roomId: targetRoomId,
-        messages: all
-      };
 
-      webrtc.sendToPeer(fromPeerId, syncFullEvent);
+      // Ship as chunked chat-sync-batch events instead of a single
+      // chat-sync-full payload. A monolithic dump of up to FULL_SYNC_LIMIT
+      // messages can exceed the WebRTC SCTP per-message size ceiling and be
+      // silently dropped - especially after bulk plugin imports.
+      for (const chunk of chunkArray(all, CHUNK_SIZE)) {
+        const syncBatchEvent: ChatEvent = {
+          type: 'chat-sync-batch',
+          roomId: targetRoomId,
+          messages: chunk
+        };
+
+        webrtc.sendToPeer(fromPeerId, syncBatchEvent);
+      }
     })()
   ).pipe(mergeMap(() => EMPTY));
 }