From b4bbeff47a3eeaef673d3f63f20c61dcf5f0835e Mon Sep 17 00:00:00 2001
From: Josh Callender <1569818+saponifi3d@users.noreply.github.com>
Date: Fri, 9 Jan 2026 15:47:58 -0800
Subject: [PATCH 1/2] Add an index to the incident group open period

---
 src/sentry/workflow_engine/models/incident_groupopenperiod.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/sentry/workflow_engine/models/incident_groupopenperiod.py b/src/sentry/workflow_engine/models/incident_groupopenperiod.py
index 3415742b404253..049998f192b558 100644
--- a/src/sentry/workflow_engine/models/incident_groupopenperiod.py
+++ b/src/sentry/workflow_engine/models/incident_groupopenperiod.py
@@ -38,6 +38,9 @@ class IncidentGroupOpenPeriod(DefaultFieldsModel):
     class Meta:
         db_table = "workflow_engine_incidentgroupopenperiod"
         app_label = "workflow_engine"
+        indexes = [
+            models.Index(fields=["incident_identifier"]),
+        ]
         constraints = [
             models.CheckConstraint(
                 condition=Q(incident_identifier__isnull=False) & Q(incident_id__isnull=False)

From 634e93a9423550db9e2245cebf5c50c5fdff37fa Mon Sep 17 00:00:00 2001
From: Josh Callender <1569818+saponifi3d@users.noreply.github.com>
Date: Fri, 9 Jan 2026 15:51:40 -0800
Subject: [PATCH 2/2] Generated Migration

---
 migrations_lockfile.txt                       |  2 +-
 .../0105_add_incident_identifer_index.py      | 35 +++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 src/sentry/workflow_engine/migrations/0105_add_incident_identifer_index.py

diff --git a/migrations_lockfile.txt b/migrations_lockfile.txt
index 1fe6fd448dd8e2..3493ef5c884790 100644
--- a/migrations_lockfile.txt
+++ b/migrations_lockfile.txt
@@ -39,4 +39,4 @@ tempest: 0003_use_encrypted_char_field
 
 uptime: 0049_cleanup_failed_safe_deletes
 
-workflow_engine: 0104_action_data_fallthrough_type
+workflow_engine: 0105_add_incident_identifer_index
diff --git a/src/sentry/workflow_engine/migrations/0105_add_incident_identifer_index.py b/src/sentry/workflow_engine/migrations/0105_add_incident_identifer_index.py
new file mode 100644
index 00000000000000..e0120afb311d86
--- /dev/null
+++ b/src/sentry/workflow_engine/migrations/0105_add_incident_identifer_index.py
@@ -0,0 +1,35 @@
+# Generated by Django 5.2.8 on 2026-01-09 23:47
+
+from django.db import migrations, models
+
+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.
+    # 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 post deployment:
+    # - Large data migrations. Typically we want these to be run manually 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
+    #   run this outside deployments so that we don't block them. Note that while adding an index
+    #   is a schema change, it's completely safe to run the operation after the code has deployed.
+    # Once deployed, run these manually via: https://develop.sentry.dev/database-migrations/#migration-deployment
+
+    is_post_deployment = True
+
+    dependencies = [
+        ("sentry", "1016_remove_on_command_phrase_trigger"),
+        ("workflow_engine", "0104_action_data_fallthrough_type"),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name="incidentgroupopenperiod",
+            index=models.Index(
+                fields=["incident_identifier"], name="workflow_en_inciden_2450f4_idx"
+            ),
+        ),
+    ]