diff --git a/backend/.sqlx/query-07548bfb29b053e7ea6e915c67c81a89d09e226c4640ea476e05b192856bfbcb.json b/backend/.sqlx/query-07548bfb29b053e7ea6e915c67c81a89d09e226c4640ea476e05b192856bfbcb.json
deleted file mode 100644
index c6aa655691..0000000000
--- a/backend/.sqlx/query-07548bfb29b053e7ea6e915c67c81a89d09e226c4640ea476e05b192856bfbcb.json
+++ /dev/null
@@ -1,41 +0,0 @@
-{
-  "db_name": "PostgreSQL",
-  "query": "\n                WITH live_gates AS (\n                    SELECT concurrency_gate_id AS id\n                    FROM v2_job_queue\n                    WHERE running = false AND concurrency_gate_id IS NOT NULL\n                    GROUP BY concurrency_gate_id\n                    HAVING MAX(concurrency_gated_at) >= NOW() - $2::interval\n                )\n                SELECT COUNT(*) FILTER (WHERE overdue AND g.id IS NULL) AS ungated_count,\n                       COUNT(*) FILTER (WHERE overdue AND g.id IS NOT NULL) AS gated_count,\n                       MIN(q.scheduled_for) FILTER (WHERE overdue AND g.id IS NULL)\n                           AS oldest_ungated,\n                       MIN(q.scheduled_for) FILTER (WHERE overdue) AS oldest_overdue\n                FROM (\n                    SELECT scheduled_for, concurrency_gate_id,\n                           scheduled_for <= NOW() - $2::interval AS overdue\n                    FROM v2_job_queue\n                    WHERE tag = $1 AND running = false\n                ) q\n                LEFT JOIN live_gates g ON g.id = q.concurrency_gate_id\n                ",
-  "describe": {
-    "columns": [
-      {
-        "ordinal": 0,
-        "name": "ungated_count",
-        "type_info": "Int8"
-      },
-      {
-        "ordinal": 1,
-        "name": "gated_count",
-        "type_info": "Int8"
-      },
-      {
-        "ordinal": 2,
-        "name": "oldest_ungated",
-        "type_info": "Timestamptz"
-      },
-      {
-        "ordinal": 3,
-        "name": "oldest_overdue",
-        "type_info": "Timestamptz"
-      }
-    ],
-    "parameters": {
-      "Left": [
-        "Text",
-        "Interval"
-      ]
-    },
-    "nullable": [
-      null,
-      null,
-      null,
-      null
-    ]
-  },
-  "hash": "07548bfb29b053e7ea6e915c67c81a89d09e226c4640ea476e05b192856bfbcb"
-}
diff --git a/backend/.sqlx/query-428bd28304df56528604da2a5f83f0e989cb96acbd2eaff99e29110d96625f64.json b/backend/.sqlx/query-428bd28304df56528604da2a5f83f0e989cb96acbd2eaff99e29110d96625f64.json
new file mode 100644
index 0000000000..19ee787d87
--- /dev/null
+++ b/backend/.sqlx/query-428bd28304df56528604da2a5f83f0e989cb96acbd2eaff99e29110d96625f64.json
@@ -0,0 +1,36 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n                SELECT COUNT(*) FILTER (WHERE overdue AND gated IS NOT TRUE) AS ungated_count,\n                       COUNT(*) FILTER (WHERE overdue AND gated) AS gated_count,\n                       MIN(scheduled_for) FILTER (WHERE overdue AND gated IS NOT TRUE)\n                           AS oldest_ungated\n                FROM (\n                    SELECT scheduled_for,\n                           scheduled_for <= NOW() - $2::interval AS overdue,\n                           concurrency_gate_id = ANY($3::text[]) AS gated\n                    FROM v2_job_queue\n                    WHERE tag = $1 AND running = false\n                ) q\n                ",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "ungated_count",
+        "type_info": "Int8"
+      },
+      {
+        "ordinal": 1,
+        "name": "gated_count",
+        "type_info": "Int8"
+      },
+      {
+        "ordinal": 2,
+        "name": "oldest_ungated",
+        "type_info": "Timestamptz"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Text",
+        "Interval",
+        "TextArray"
+      ]
+    },
+    "nullable": [
+      null,
+      null,
+      null
+    ]
+  },
+  "hash": "428bd28304df56528604da2a5f83f0e989cb96acbd2eaff99e29110d96625f64"
+}
diff --git a/backend/.sqlx/query-67ac13428f6d5360197a90e5a2262c2f29bcd88d9117d3504f84e705f38cbe04.json b/backend/.sqlx/query-67ac13428f6d5360197a90e5a2262c2f29bcd88d9117d3504f84e705f38cbe04.json
new file mode 100644
index 0000000000..fb7924d7c4
--- /dev/null
+++ b/backend/.sqlx/query-67ac13428f6d5360197a90e5a2262c2f29bcd88d9117d3504f84e705f38cbe04.json
@@ -0,0 +1,22 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "\n                SELECT concurrency_gate_id AS \"id!\"\n                FROM v2_job_queue\n                WHERE running = false AND concurrency_gate_id IS NOT NULL\n                GROUP BY concurrency_gate_id\n                HAVING MAX(concurrency_gated_at) >= NOW() - $1::interval\n                ",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "id!",
+        "type_info": "Varchar"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Interval"
+      ]
+    },
+    "nullable": [
+      true
+    ]
+  },
+  "hash": "67ac13428f6d5360197a90e5a2262c2f29bcd88d9117d3504f84e705f38cbe04"
+}
diff --git a/backend/ee-repo-ref.txt b/backend/ee-repo-ref.txt
index 388667dfe5..2cbf91cdc3 100644
--- a/backend/ee-repo-ref.txt
+++ b/backend/ee-repo-ref.txt
@@ -1 +1 @@
-5e449c771fc1fed928b40727378cd67c3380b5cb
\ No newline at end of file
+d3445d03c1f103f7fc5432a7d898a5ae8db728ee
\ No newline at end of file
diff --git a/backend/migrations/20260720055519_concurrency_gated_flag.down.sql b/backend/migrations/20260720055519_concurrency_gated_flag.down.sql
index f1c706c5d4..32e6398ff2 100644
--- a/backend/migrations/20260720055519_concurrency_gated_flag.down.sql
+++ b/backend/migrations/20260720055519_concurrency_gated_flag.down.sql
@@ -1,2 +1,3 @@
+DROP INDEX IF EXISTS v2_job_queue_concurrency_gate;
 ALTER TABLE v2_job_queue DROP COLUMN IF EXISTS concurrency_gated_at;
 ALTER TABLE v2_job_queue DROP COLUMN IF EXISTS concurrency_gate_id;
diff --git a/backend/migrations/20260720055519_concurrency_gated_flag.up.sql b/backend/migrations/20260720055519_concurrency_gated_flag.up.sql
index fb710d2a9b..a9e8589cd1 100644
--- a/backend/migrations/20260720055519_concurrency_gated_flag.up.sql
+++ b/backend/migrations/20260720055519_concurrency_gated_flag.up.sql
@@ -4,3 +4,9 @@
 -- policies, and only jobs under the same one share a gate.
 ALTER TABLE v2_job_queue ADD COLUMN IF NOT EXISTS concurrency_gated_at TIMESTAMPTZ;
 ALTER TABLE v2_job_queue ADD COLUMN IF NOT EXISTS concurrency_gate_id VARCHAR(320);
+
+-- Serves the queue-depth alert's per-gate liveness aggregate. Partial so it only
+-- covers jobs a gate actually parked, leaving the ordinary queue path unindexed.
+CREATE INDEX IF NOT EXISTS v2_job_queue_concurrency_gate
+    ON v2_job_queue (concurrency_gate_id, concurrency_gated_at DESC)
+    WHERE running = false AND concurrency_gate_id IS NOT NULL;