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

toju-app/src/app/infrastructure/persistence/database.service.ts

@@ -49,8 +49,19 @@ export class DatabaseService {
   /** Persist a single chat message. */
   saveMessage(message: Message) { return this.backend.saveMessage(message); }
 
-  /** Retrieve the latest messages for a room with optional pagination. */
-  getMessages(roomId: string, limit = 100, offset = 0) { return this.backend.getMessages(roomId, limit, offset); }
+  /** Retrieve the latest messages for a room or channel with optional pagination.
+   *
+   * When `beforeTimestamp` is provided, only messages strictly older than that
+   * timestamp are returned. This is how scroll-up history loading paginates
+   * backwards through the DB without holding the whole history in memory.
+   */
+  getMessages(
+    roomId: string,
+    limit = 100,
+    offset = 0,
+    channelId?: string,
+    beforeTimestamp?: number
+  ) { return this.backend.getMessages(roomId, limit, offset, channelId, beforeTimestamp); }
 
   /** Retrieve messages newer than a given timestamp for a room. */
   getMessagesSince(roomId: string, sinceTimestamp: number) { return this.backend.getMessagesSince(roomId, sinceTimestamp); }