fix(api): дождаться запросов перед операцией с базой

backend/src/plugins/database-request-gate.ts

@@ -0,0 +1,31 @@
+import type { FastifyInstance, FastifyRequest } from "fastify"
+import { DatabaseRequestGate } from "../services/database-request-gate.js"
+const streams = new WeakMap<FastifyRequest, { cancelled: boolean; abort?: () => void }>()
+
+export function registerDatabaseStreamAbort(request: FastifyRequest, abort: () => void): void {
+  const state = streams.get(request)
+  if (!state) return
+  state.abort = abort
+  if (state.cancelled) abort()
+}
+
+export function installDatabaseRequestGate(app: FastifyInstance): void {
+  const gate = new DatabaseRequestGate()
+  app.addHook("onRoute", options => {
+    const path = options.url
+    if (!path.startsWith("/api/") || path === "/api/auth/config") return
+    const original = options.handler
+    const operation = path === "/api/system/database/backup" || path === "/api/system/database/restore"
+    const stream = path === "/api/traffic/flow/live" || /^\/api\/traffic\/servers\/:id\/live$/.test(path)
+    options.handler = async function (request, reply) {
+      const run = async () => await original.call(this, request, reply)
+      if (operation) return gate.exclusive(run)
+      if (!stream) return gate.request(run)
+      const state = { cancelled: false, abort: undefined as (() => void) | undefined }
+      streams.set(request, state)
+      try {
+        return await gate.request(run, () => { state.cancelled = true; state.abort?.() })
+      } finally { streams.delete(request) }
+    }
+  })
+}