Merge pull request #2257 from alphagov/add-index-to-notifications

New index for  notifications

migrations/versions/0246_notifications_index.py

@@ -0,0 +1,26 @@
+"""
+
+Revision ID: 0246_notifications_index
+Revises: 0245_archived_flag_jobs
+Create Date: 2018-12-12 12:00:09.770775
+
+"""
+from alembic import op
+
+revision = '0246_notifications_index'
+down_revision = '0245_archived_flag_jobs'
+
+
+def upgrade():
+    conn = op.get_bind()
+    conn.execute(
+        "CREATE INDEX IF NOT EXISTS ix_notifications_service_created_at ON notifications (service_id, created_at)"
+    )
+
+
+def downgrade():
+    conn = op.get_bind()
+    conn.execute(
+        "DROP INDEX IF EXISTS ix_notifications_service_created_at"
+    )
+