fix(traffic): останавливать сбор при потере соединения блокировки

docs/ux-ui/acceptance/owned200-result.json

@@ -0,0 +1,22 @@
+{
+  "date": "2026-10-13",
+  "block": "12.5.200",
+  "database": "mm_accept_166_1791883011630",
+  "scope": "ephemeral role and precreated owned database; no copied production credentials",
+  "tests": [
+    {
+      "command": "npm --prefix backend run test:traffic-rate",
+      "passed": true,
+      "durationMs": 57603,
+      "ownedTrafficSqlCases": 9,
+      "ownedHistorySqlCases": 14,
+      "ownedLiveSqlCases": 10,
+      "ownedVolumeSqlCases": 17,
+      "ownedStatusSqlCases": 21,
+      "ownedConcurrencySqlSequencePassed": true,
+      "postgresUnavailableSkip": false
+    }
+  ],
+  "scopedRoleVerified": true,
+  "passed": true
+}