Remove startup check for update_alert_after trigger, remove drop_triggers command.

hc/api/management/commands/droptriggers.py

@@ -1,37 +0,0 @@
-from django.core.management.base import BaseCommand
-from django.db import connection
-
-
-def _pg(cursor):
-    cursor.execute("""
-    DROP TRIGGER IF EXISTS update_alert_after ON api_check;
-    """)
-
-
-def _mysql(cursor):
-    cursor.execute("""
-    DROP TRIGGER IF EXISTS update_alert_after;
-    """)
-
-
-def _sqlite(cursor):
-    cursor.execute("""
-    DROP TRIGGER IF EXISTS update_alert_after;
-    """)
-
-
-class Command(BaseCommand):
-    help = 'Drops the `update_alert_after` trigger'
-    requires_system_checks = False
-
-    def handle(self, *args, **options):
-        with connection.cursor() as cursor:
-            if connection.vendor == "postgresql":
-                _pg(cursor)
-                return "Dropped PostgreSQL trigger"
-            if connection.vendor == "mysql":
-                _mysql(cursor)
-                return "Dropped MySQL trigger"
-            if connection.vendor == "sqlite":
-                _sqlite(cursor)
-                return "Dropped SQLite trigger"

hc/api/models.py

@@ -186,29 +186,6 @@ class Check(models.Model):
     def has_confirmation_link(self):
         return "confirm" in self.last_ping_body.lower()
 
-    @classmethod
-    def check(cls, **kwargs):
-        errors = super(Check, cls).check(**kwargs)
-
-        trigger_detected = False
-        try:
-            dummy = Check(last_ping=timezone.now())
-            dummy.save()
-            dummy.refresh_from_db()
-            trigger_detected = bool(dummy.alert_after)
-            dummy.delete()
-        except:
-            pass
-
-        if trigger_detected:
-            err = Warning(
-                "Obsolete 'update_alert_after' trigger exists in database.",
-                hint="Please remove the trigger with 'manage.py droptriggers'",
-                id="hc.api.E001")
-            errors.append(err)
-
-        return errors
-
 
 class Ping(models.Model):
     n = models.IntegerField(null=True)