events: fix SystemTask timestamps and scheduling (#8435)

* events: fix SystemTask timestamps

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix error during prefill

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix prefill not running per tenants

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* run scheduled tasks on startup when needed

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* remove some explicit startup tasks

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix unrelated crypto warning

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* fix import loop on reputation policy

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* pass correct task params

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* make enterprise task monitored

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* slightly different formatting for task list

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

* also pre-squash migrations

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

---------

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/events/models.py

@@ -620,8 +620,9 @@ class SystemTask(SerializerModel, ExpiringModel):
     name = models.TextField()
     uid = models.TextField(null=True)
 
-    start_timestamp = models.FloatField()
-    finish_timestamp = models.FloatField()
+    start_timestamp = models.DateTimeField()
+    finish_timestamp = models.DateTimeField()
+    duration = models.FloatField()
 
     status = models.TextField(choices=TaskStatus.choices)