fix: Restore showing LISTEN pgrst in pg_stat_activity

test/io/test_io.py

@@ -3,6 +3,7 @@
 import os
 import re
 import signal
+import subprocess
 import time
 import pytest
 
@@ -690,6 +691,39 @@ def test_admin_ready_w_channel(defaultenv):
         assert response.status_code == 200
 
 
+def test_listener_query_is_visible_in_pg_stat_activity(defaultenv):
+    "The listener connection should show the LISTEN pgrst statement in pg_stat_activity"
+
+    env = {
+        **defaultenv,
+        "PGRST_DB_CHANNEL_ENABLED": "true",
+        "PGAPPNAME": "listener-query-test",
+    }
+
+    with run(env=env):
+        query = """
+select query
+from pg_stat_activity
+where application_name = 'listener-query-test'
+  and query = 'LISTEN "pgrst"'
+limit 1;
+"""
+        output = subprocess.check_output(
+            [
+                "psql",
+                "--set",
+                "ON_ERROR_STOP=1",
+                "--tuples-only",
+                "--no-align",
+                "-c",
+                query,
+            ],
+            text=True,
+        ).strip()
+
+        assert output == 'LISTEN "pgrst"'
+
+
 def test_admin_ready_wo_channel(defaultenv):
     "Should get a success response from the admin server ready endpoint when the LISTEN channel is disabled"