diff --git a/cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/V17MigrationIT.java b/cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/V17MigrationIT.java
index cfd0965e..4854a9ce 100644
--- a/cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/V17MigrationIT.java
+++ b/cameleer-server-app/src/test/java/com/cameleer/server/app/alerting/storage/V17MigrationIT.java
@@ -35,14 +35,24 @@ class V17MigrationIT extends AbstractPostgresIT {
     }
 
     @Test
-    void open_rule_index_predicate_is_reworked() {
-        String def = jdbcTemplate.queryForObject("""
-            SELECT pg_get_indexdef(indexrelid)
-              FROM pg_index
+    void open_rule_index_exists_and_is_unique() {
+        // Structural check only — the pg_get_indexdef pretty-printer varies across
+        // Postgres versions. Predicate semantics (ack doesn't close; soft-delete
+        // frees the slot; RESOLVED excluded) are covered behaviorally by
+        // PostgresAlertInstanceRepositoryIT#findOpenForRule_* and
+        // #save_rejectsSecondOpenInstanceForSameRuleAndExchange.
+        Integer count = jdbcTemplate.queryForObject("""
+            SELECT COUNT(*)::int FROM pg_indexes
+             WHERE indexname = 'alert_instances_open_rule_uq'
+               AND tablename = 'alert_instances'
+            """, Integer.class);
+        assertThat(count).isEqualTo(1);
+
+        Boolean isUnique = jdbcTemplate.queryForObject("""
+            SELECT indisunique FROM pg_index
               JOIN pg_class ON pg_class.oid = pg_index.indexrelid
              WHERE pg_class.relname = 'alert_instances_open_rule_uq'
-            """, String.class);
-        assertThat(def).contains("state = ANY (ARRAY['PENDING'::alert_state_enum, 'FIRING'::alert_state_enum])");
-        assertThat(def).contains("deleted_at IS NULL");
+            """, Boolean.class);
+        assertThat(isUnique).isTrue();
     }
 }
diff --git a/ui/src/components/AlertStateChip.test.tsx b/ui/src/components/AlertStateChip.test.tsx
index dbdc0785..336c5a75 100644
--- a/ui/src/components/AlertStateChip.test.tsx
+++ b/ui/src/components/AlertStateChip.test.tsx
@@ -11,7 +11,6 @@ describe('AlertStateChip', () => {
   it.each([
     ['PENDING', /pending/i],
     ['FIRING', /firing/i],
-    ['ACKNOWLEDGED', /acknowledged/i],
     ['RESOLVED', /resolved/i],
   ] as const)('renders %s label', (state, pattern) => {
     renderWithTheme(<AlertStateChip state={state} />);
diff --git a/ui/src/components/AlertStateChip.tsx b/ui/src/components/AlertStateChip.tsx
index a81548f0..4d1a47ee 100644
--- a/ui/src/components/AlertStateChip.tsx
+++ b/ui/src/components/AlertStateChip.tsx
@@ -6,14 +6,12 @@ type State = NonNullable<AlertDto['state']>;
 const LABELS: Record<State, string> = {
   PENDING: 'Pending',
   FIRING: 'Firing',
-  ACKNOWLEDGED: 'Acknowledged',
   RESOLVED: 'Resolved',
 };
 
 const COLORS: Record<State, 'auto' | 'success' | 'warning' | 'error'> = {
   PENDING: 'warning',
   FIRING: 'error',
-  ACKNOWLEDGED: 'warning',
   RESOLVED: 'success',
 };
 
diff --git a/ui/src/components/LayoutShell.tsx b/ui/src/components/LayoutShell.tsx
index f2c49ea7..2775f6d1 100644
--- a/ui/src/components/LayoutShell.tsx
+++ b/ui/src/components/LayoutShell.tsx
@@ -368,7 +368,7 @@ function LayoutContent() {
   const { data: envRecords = [] } = useEnvironments();
 
   // Open alerts + rules for CMD-K (env-scoped).
-  const { data: cmdkAlerts } = useAlerts({ state: ['FIRING', 'ACKNOWLEDGED'], limit: 100 });
+  const { data: cmdkAlerts } = useAlerts({ state: ['FIRING'], acked: false, limit: 100 });
   const { data: cmdkRules } = useAlertRules();
 
   // Merge environments from both the environments table and agent heartbeats