Надёжная real-time доставка сообщений в чатах: SSE buffer, Last-Event-ID, polling fallback

server/routes/messenger.messages.routes.ts

@@ -2,7 +2,7 @@ import { Router } from "express";
 import { z } from "zod";
 import { db, openTenantCtx } from "../db";
 import { conversations, conversationMembers, conversationMessages, users, bots, type Bot } from "@shared/schema";
-import { eq, and, lt, desc, sql, inArray } from "drizzle-orm";
+import { eq, and, lt, gt, desc, sql, inArray } from "drizzle-orm";
 import { authenticateToken, type AuthenticatedRequest } from "../middleware/auth.middleware";
 import { tenantIsolation } from "../middleware/tenant.middleware";
 import { eventBus } from "./shared";
@@ -28,6 +28,7 @@ export function registerMessengerMessageRoutes(router: Router): void {
 
         const limit = Math.min(parseInt((req.query.limit as string) ?? "50"), 100);
         const beforeId = req.query.beforeId ? parseInt(req.query.beforeId as string) : null;
+        const afterId = req.query.afterId ? parseInt(req.query.afterId as string) : null;
 
         const conditions = [
           eq(conversationMessages.conversationId, convId),
@@ -36,6 +37,9 @@ export function registerMessengerMessageRoutes(router: Router): void {
         if (beforeId !== null && !isNaN(beforeId)) {
           conditions.push(lt(conversationMessages.id, beforeId));
         }
+        if (afterId !== null && !isNaN(afterId)) {
+          conditions.push(gt(conversationMessages.id, afterId));
+        }
 
         const msgs = await db
           .select({