diff --git a/awx/main/models/ad_hoc_commands.py b/awx/main/models/ad_hoc_commands.py
index 3cc3b1da42..56137378d6 100644
--- a/awx/main/models/ad_hoc_commands.py
+++ b/awx/main/models/ad_hoc_commands.py
@@ -15,6 +15,7 @@ from django.core.exceptions import ValidationError
 # AWX
 from awx.api.versioning import reverse
 from awx.main.models.base import * # noqa
+from awx.main.models.events import AdHocCommandEvent
 from awx.main.models.unified_jobs import * # noqa
 from awx.main.models.notifications import JobNotificationMixin, NotificationTemplate
 
@@ -123,6 +124,10 @@ class AdHocCommand(UnifiedJob, JobNotificationMixin):
             raise ValidationError(_('No argument passed to %s module.') % self.module_name)
         return module_args
 
+    @property
+    def event_class(self):
+        return AdHocCommandEvent
+
     @property
     def passwords_needed_to_start(self):
         '''Return list of password field names needed to start the job.'''
diff --git a/awx/main/models/inventory.py b/awx/main/models/inventory.py
index 5f136ee5b2..fcf77fd959 100644
--- a/awx/main/models/inventory.py
+++ b/awx/main/models/inventory.py
@@ -29,6 +29,7 @@ from awx.main.fields import (
 )
 from awx.main.managers import HostManager
 from awx.main.models.base import * # noqa
+from awx.main.models.events import InventoryUpdateEvent
 from awx.main.models.unified_jobs import * # noqa
 from awx.main.models.mixins import ResourceMixin, TaskManagerInventoryUpdateMixin
 from awx.main.models.notifications import (
@@ -1590,6 +1591,10 @@ class InventoryUpdate(UnifiedJob, InventorySourceOptions, JobNotificationMixin,
             self.inventory_source.source_project.get_project_path(check_if_exists=False),
             self.source_path)
 
+    @property
+    def event_class(self):
+        return InventoryUpdateEvent
+
     @property
     def task_impact(self):
         return 50
diff --git a/awx/main/models/jobs.py b/awx/main/models/jobs.py
index 6599b14811..a0be486102 100644
--- a/awx/main/models/jobs.py
+++ b/awx/main/models/jobs.py
@@ -26,6 +26,7 @@ from rest_framework.exceptions import ParseError
 # AWX
 from awx.api.versioning import reverse
 from awx.main.models.base import * # noqa
+from awx.main.models.events import JobEvent, SystemJobEvent
 from awx.main.models.unified_jobs import * # noqa
 from awx.main.models.notifications import (
     NotificationTemplate,
@@ -512,6 +513,10 @@ class Job(UnifiedJob, JobOptions, SurveyJobMixin, JobNotificationMixin, TaskMana
     def get_ui_url(self):
         return urljoin(settings.TOWER_URL_BASE, "/#/jobs/{}".format(self.pk))
 
+    @property
+    def event_class(self):
+        return JobEvent
+
     @property
     def ask_diff_mode_on_launch(self):
         if self.job_template is not None:
@@ -1165,6 +1170,10 @@ class SystemJob(UnifiedJob, SystemJobOptions, JobNotificationMixin):
     def get_ui_url(self):
         return urljoin(settings.TOWER_URL_BASE, "/#/management_jobs/{}".format(self.pk))
 
+    @property
+    def event_class(self):
+        return SystemJobEvent
+
     @property
     def task_impact(self):
         return 150
diff --git a/awx/main/models/projects.py b/awx/main/models/projects.py
index a8578b97bd..c8687cab0b 100644
--- a/awx/main/models/projects.py
+++ b/awx/main/models/projects.py
@@ -18,6 +18,7 @@ from django.utils.timezone import now, make_aware, get_default_timezone
 # AWX
 from awx.api.versioning import reverse
 from awx.main.models.base import * # noqa
+from awx.main.models.events import ProjectUpdateEvent
 from awx.main.models.notifications import (
     NotificationTemplate,
     JobNotificationMixin,
@@ -485,6 +486,10 @@ class ProjectUpdate(UnifiedJob, ProjectOptions, JobNotificationMixin, TaskManage
         websocket_data.update(dict(project_id=self.project.id))
         return websocket_data
 
+    @property
+    def event_class(self):
+        return ProjectUpdateEvent
+
     @property
     def task_impact(self):
         return 0 if self.job_type == 'run' else 20
diff --git a/awx/main/models/unified_jobs.py b/awx/main/models/unified_jobs.py
index 79431a5dec..ca9e07278e 100644
--- a/awx/main/models/unified_jobs.py
+++ b/awx/main/models/unified_jobs.py
@@ -893,6 +893,10 @@ class UnifiedJob(PolymorphicModel, PasswordFieldsModel, CommonModelNameNotUnique
             config.credentials.add(*job_creds)
         return config
 
+    @property
+    def event_class(self):
+        raise NotImplementedError()
+
     @property
     def result_stdout_text(self):
         related = UnifiedJobDeprecatedStdout.objects.get(pk=self.pk)
@@ -974,16 +978,11 @@ class UnifiedJob(PolymorphicModel, PasswordFieldsModel, CommonModelNameNotUnique
                     # detect the length of all stdout for this UnifiedJob, and
                     # if it exceeds settings.STDOUT_MAX_BYTES_DISPLAY bytes,
                     # don't bother actually fetching the data
-                    cursor.execute(
-                        "select sum(length(stdout)) from {} where {}={}".format(
-                            tablename + 'event',
-                            related_name,
-                            self.id
-                        )
-                    )
-                    total_bytes = cursor.fetchone()[0]
-                    if total_bytes > max_supported:
-                        raise StdoutMaxBytesExceeded(total_bytes, max_supported)
+                    total = self.event_class.objects.filter(**{related_name: self.id}).aggregate(
+                        total=models.Sum(models.Func(models.F('stdout'), function='LENGTH'))
+                    )['total']
+                    if total > max_supported:
+                        raise StdoutMaxBytesExceeded(total, max_supported)
 
                 cursor.copy_expert(
                     "copy (select stdout from {} where {}={} order by start_line) to stdout".format(