fix(uptime): отличать ошибки опроса от измеренных потерь Ping

docs/ux-ui/acceptance/ping-measurement-sql-2026-10-12.json

@@ -0,0 +1,23 @@
+{
+  "date": "2026-10-12",
+  "block": "12.5.173",
+  "database": "mm_accept_166_1791801498307",
+  "scope": "ephemeral role and precreated owned database; no copied production credentials",
+  "tests": [
+    {
+      "command": "npm --prefix backend run test:alert-engine",
+      "passed": true,
+      "durationMs": 42380,
+      "ownedHistorySqlRows": 8,
+      "ownedSourceSqlCases": 26,
+      "pingMeasurementSqlCases": 8,
+      "sqlConfirmStabilityPassed": true,
+      "postgresUnavailableSkip": false
+    }
+  ],
+  "scopedRoleVerified": true,
+  "passed": true,
+  "databaseRemoved": true,
+  "roleRemoved": true,
+  "testContainerRemoved": true
+}