Create logger instannce index on (xform_id, id)

Signed-off-by: Kipchirchir Sigei <[email protected]>

onadata/apps/logger/migrations/0011_add_xform_id_instance_id_idx.py

@@ -0,0 +1,30 @@
+# Generated by Django 3.2.20 on 2023-11-23 16:01
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    atomic = False
+
+    dependencies = [
+        ('logger', '0010_auto_20230921_0346'),
+    ]
+
+    operations = [
+        migrations.SeparateDatabaseAndState(
+            database_operations=[
+                migrations.RunSQL(
+                    sql='CREATE INDEX CONCURRENTLY "logger_instance_id_xform_id_index" ON "logger_instance" ("xform_id", "id");',
+                    reverse_sql='DROP INDEX "logger_instance_id_xform_id_index";',
+                ),
+            ],
+            state_operations=[
+                migrations.AddIndex(
+                    model_name="instance",
+                    index=models.Index(
+                        fields=["xform_id", "id"], name="logger_instance_id_xform_id_index"
+                    ),
+                ),
+            ],
+        )
+    ]

onadata/apps/logger/models/instance.py

@@ -685,6 +685,7 @@ class Meta:
             models.Index(fields=["date_created"]),
             models.Index(fields=["date_modified"]),
             models.Index(fields=["deleted_at"]),
+            models.Index(fields=["xform_id", "id"]),
         ]
 
     @classmethod