diff --git a/cylc/flow/workflow_db_mgr.py b/cylc/flow/workflow_db_mgr.py
index c370992f7b0..0b98d0662d9 100644
--- a/cylc/flow/workflow_db_mgr.py
+++ b/cylc/flow/workflow_db_mgr.py
@@ -408,9 +408,10 @@ def put_task_event_timers(self, task_events_mgr) -> None:
     def put_xtriggers(self, sat_xtrig):
         """Put statements to update external triggers table."""
         for sig, res in sat_xtrig.items():
-            self.db_inserts_map[self.TABLE_XTRIGGERS].append({
-                "signature": sig,
-                "results": json.dumps(res)})
+            if not sig.startswith('wall_clock('):
+                self.db_inserts_map[self.TABLE_XTRIGGERS].append({
+                    "signature": sig,
+                    "results": json.dumps(res)})
 
     def put_update_task_state(self, itask):
         """Update task_states table for current state of itask.
diff --git a/tests/integration/test_workflow_db_mgr.py b/tests/integration/test_workflow_db_mgr.py
index fa15c9165b0..cf4fca7e064 100644
--- a/tests/integration/test_workflow_db_mgr.py
+++ b/tests/integration/test_workflow_db_mgr.py
@@ -14,10 +14,15 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+import asyncio
 import pytest
 import sqlite3
+from typing import TYPE_CHECKING
 
-from cylc.flow.scheduler import Scheduler
+from cylc.flow.cycling.iso8601 import ISO8601Point
+
+if TYPE_CHECKING:
+    from cylc.flow.scheduler import Scheduler
 
 
 async def test_restart_number(
@@ -29,7 +34,7 @@ async def test_restart_number(
     async def test(expected_restart_num: int, do_reload: bool = False):
         """(Re)start the workflow and check the restart number is as expected.
         """
-        schd: Scheduler = scheduler(id_, paused_start=True)
+        schd: 'Scheduler' = scheduler(id_, paused_start=True)
         async with start(schd) as log:
             if do_reload:
                 schd.command_reload_workflow()
@@ -52,7 +57,7 @@ async def test(expected_restart_num: int, do_reload: bool = False):
     await test(expected_restart_num=3)
 
 
-def db_remove_column(schd: Scheduler, table: str, column: str) -> None:
+def db_remove_column(schd: 'Scheduler', table: str, column: str) -> None:
     """Remove a column from a scheduler DB table.
 
     ALTER TABLE DROP COLUMN is not supported by sqlite yet, so we have to copy
@@ -82,7 +87,7 @@ async def test_db_upgrade_pre_803(
     id_ = flow(one_conf)
 
     # Run a scheduler to create a DB.
-    schd: Scheduler = scheduler(id_, paused_start=True)
+    schd: 'Scheduler' = scheduler(id_, paused_start=True)
     async with start(schd):
         assert ('n_restart', '0') in db_select(schd, False, 'workflow_params')
 
@@ -90,7 +95,7 @@ async def test_db_upgrade_pre_803(
     db_remove_column(schd, "task_states", "is_manual_submit")
     db_remove_column(schd, "task_jobs", "flow_nums")
 
-    schd: Scheduler = scheduler(id_, paused_start=True)
+    schd: 'Scheduler' = scheduler(id_, paused_start=True)
 
     # Restart should fail due to the missing column.
     with pytest.raises(sqlite3.OperationalError):
@@ -98,7 +103,7 @@ async def test_db_upgrade_pre_803(
             pass
     assert ('n_restart', '1') in db_select(schd, False, 'workflow_params')
 
-    schd: Scheduler = scheduler(id_, paused_start=True)
+    schd: 'Scheduler' = scheduler(id_, paused_start=True)
 
     # Run the DB upgrader for version 8.0.2
     # (8.0.2 requires upgrade)
@@ -117,7 +122,7 @@ async def test_workflow_param_rapid_toggle(
 
     https://github.com/cylc/cylc-flow/issues/5593
     """
-    schd: Scheduler = scheduler(flow(one_conf), paused_start=False)
+    schd: 'Scheduler' = scheduler(flow(one_conf), paused_start=False)
     async with run(schd):
         assert schd.is_paused is False
         schd.pause_workflow()
@@ -127,3 +132,50 @@ async def test_workflow_param_rapid_toggle(
 
         w_params = dict(schd.workflow_db_mgr.pri_dao.select_workflow_params())
         assert w_params['is_paused'] == '0'
+
+
+async def test_record_only_non_clock_triggers(
+    flow, run, scheduler, complete, db_select
+):
+    """Database does not record wall_clock xtriggers.
+
+    https://github.com/cylc/cylc-flow/issues/5911
+
+    Includes:
+        - Not in DB: A normal wall clock xtrigger (wall_clock).
+        - In DB: An xrandom mis-labelled as wall_clock trigger  DB).
+        - Not in DB: An execution retry xtrigger.
+
+    @TODO: Refactor to use simulation mode to speedup after Simulation
+    mode upgrade bugfixes: This should speed this test up considerably.
+    """
+    rawpoint = '1348'
+    id_ = flow({
+        "scheduler": {
+            'cycle point format': '%Y',
+            'allow implicit tasks': True
+        },
+        "scheduling": {
+            "initial cycle point": rawpoint,
+            "xtriggers": {
+                "another": "xrandom(100)",
+                "wall_clock": "xrandom(100, _=Not a real wall clock trigger)",
+                "real_wall_clock": "wall_clock()"
+            },
+            "graph": {
+                "R1": """
+                    @another & @wall_clock & @real_wall_clock => foo
+                    @real_wall_clock => bar
+                """
+            }
+        },
+    })
+    schd = scheduler(id_, paused_start=False, run_mode='simulation')
+
+    async with run(schd):
+        await complete(schd, timeout=20)
+
+    # Assert that (only) the real clock trigger is not in the db:
+    assert db_select(schd, False, 'xtriggers', 'signature') == [
+        ('xrandom(100)',),
+        ('xrandom(100, _=Not a real wall clock trigger)',)]