ref: represent organization slug upper index in code (#91879)

<!-- Describe your PR here. -->

Author: asottile-sentry

migrations_lockfile.txt

@@ -21,7 +21,7 @@ remote_subscriptions: 0003_drop_remote_subscription
 
 replays: 0005_drop_replay_index
 
-sentry: 0898_groupedmessage_wrong_int_type
+sentry: 0899_organization_slug_upper_idx
 
 social_auth: 0002_default_auto_field
 

src/sentry/migrations/0899_organization_slug_upper_idx.py

@@ -0,0 +1,40 @@
+# Generated by Django 5.2.1 on 2025-05-19 17:18
+
+import django.db.models.functions.text
+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 = False
+
+    dependencies = [
+        ("sentry", "0898_groupedmessage_wrong_int_type"),
+    ]
+
+    operations = [
+        migrations.SeparateDatabaseAndState(
+            state_operations=[
+                migrations.AddIndex(
+                    model_name="organization",
+                    index=models.Index(
+                        django.db.models.functions.text.Upper("slug"),
+                        name="organization_slug_upper_idx",
+                    ),
+                ),
+            ]
+        )
+    ]

src/sentry/models/organization.py

@@ -6,6 +6,7 @@
 
 from django.conf import settings
 from django.db import models, router, transaction
+from django.db.models.functions.text import Upper
 from django.urls import NoReverseMatch, reverse
 from django.utils import timezone
 from django.utils.functional import cached_property
@@ -208,8 +209,7 @@ class flags(TypedClassBitField):
     class Meta:
         app_label = "sentry"
         db_table = "sentry_organization"
-        # TODO: Once we're on a version of Django that supports functional indexes,
-        # include index on `upper((slug::text))` here.
+        indexes = (models.Index(Upper("slug"), name="organization_slug_upper_idx"),)
 
     __repr__ = sane_repr("owner_id", "name", "slug")