feat(migrations): Add new index to IncidentTrigger model

migrations_lockfile.txt

@@ -9,5 +9,5 @@ feedback: 0003_feedback_add_env
 hybridcloud: 0005_add_missing_org_integration_scope
 nodestore: 0002_nodestore_no_dictfield
 replays: 0003_add_size_to_recording_segment
-sentry: 0577_drop_latest_incident_index
+sentry: 0578_add_index_on_incident_trigger_alert_ratelimit
 social_auth: 0002_default_auto_field

src/sentry/incidents/models.py

@@ -523,6 +523,7 @@ class Meta:
         app_label = "sentry"
         db_table = "sentry_incidenttrigger"
         unique_together = (("incident", "alert_rule_trigger"),)
+        index_together = (("alert_rule_trigger", "incident_id"),)
 
 
 class AlertRuleTriggerManager(BaseManager):

src/sentry/migrations/0578_add_index_on_incident_trigger_alert_ratelimit.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.2.20 on 2023-10-19 19:41
+
+from django.db import migrations
+
+from sentry.new_migrations.migrations import CheckedMigration
+
+
+class Migration(CheckedMigration):
+    # This flag is used to mark that a migration shouldn't be automatically run in production. For
+    # the most part, this should only be used for operations where it's safe to run the migration
+    # after your code has deployed. So this should not be used for most operations that alter the
+    # schema of a table.
+    # Here are some things that make sense to mark as dangerous:
+    # - Large data migrations. Typically we want these to be run manually by ops so that they can
+    #   be monitored and not block the deploy for a long period of time while they run.
+    # - Adding indexes to large tables. Since this can take a long time, we'd generally prefer to
+    #   have ops run this and not block the deploy. Note that while adding an index is a schema
+    #   change, it's completely safe to run the operation after the code has deployed.
+    is_dangerous = True
+
+    dependencies = [
+        ("sentry", "0577_drop_latest_incident_index"),
+    ]
+
+    operations = [
+        migrations.AlterIndexTogether(
+            name="incidenttrigger",
+            index_together={("alert_rule_trigger", "incident_id")},
+        ),
+    ]