perf(api): add trigram indexes for finding groups (#10378)

api/src/backend/api/migrations/0085_finding_group_daily_summary_trgm_indexes.py

@@ -0,0 +1,31 @@
+# Generated by Django 5.1.15 on 2026-03-18
+
+from django.contrib.postgres.indexes import GinIndex, OpClass
+from django.contrib.postgres.operations import AddIndexConcurrently
+from django.db import migrations
+from django.db.models.functions import Upper
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ("api", "0084_googleworkspace_provider"),
+    ]
+
+    operations = [
+        AddIndexConcurrently(
+            model_name="findinggroupdailysummary",
+            index=GinIndex(
+                OpClass(Upper("check_id"), name="gin_trgm_ops"),
+                name="fgds_check_id_trgm_idx",
+            ),
+        ),
+        AddIndexConcurrently(
+            model_name="findinggroupdailysummary",
+            index=GinIndex(
+                OpClass(Upper("check_title"), name="gin_trgm_ops"),
+                name="fgds_check_title_trgm_idx",
+            ),
+        ),
+    ]

api/src/backend/api/models.py

@@ -1783,6 +1783,15 @@ class FindingGroupDailySummary(RowLevelSecurityProtectedModel):
                 fields=["tenant_id", "provider", "inserted_at"],
                 name="fgds_tenant_prov_ins_idx",
             ),
+            # Trigram indexes for case-insensitive search
+            GinIndex(
+                OpClass(Upper("check_id"), name="gin_trgm_ops"),
+                name="fgds_check_id_trgm_idx",
+            ),
+            GinIndex(
+                OpClass(Upper("check_title"), name="gin_trgm_ops"),
+                name="fgds_check_title_trgm_idx",
+            ),
         ]
 
     class JSONAPIMeta: