fix(traffic): объединять чтения истории общего сервера

docs/ux-ui/acceptance/traffic-users-cache-2026-10-13.json

@@ -0,0 +1,15 @@
+{
+  "date": "2026-10-13",
+  "block": "12.5.193",
+  "testedActualFunction": true,
+  "concurrentUsers": 100,
+  "sharedServerReads": 1,
+  "requestScopedCache": true,
+  "separateServerReads": true,
+  "errorPropagates": true,
+  "nextRequestRecovers": true,
+  "bounds": [
+    "Function tested with real source and replaced SQL boundary; counts are not a production PostgreSQL benchmark",
+    "Actual PostgreSQL/API traffic profile passed separately"
+  ]
+}