upgrade db to add index to steps

master/buildbot/db/migrate/versions/054_add_index_to_steps.py

@@ -0,0 +1,30 @@
+# This file is part of Buildbot. Buildbot is free software: you can
+# redistribute it and/or modify it under the terms of the GNU General Public
+# License as published by the Free Software Foundation, version 2.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+# details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 51
+# Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Copyright Buildbot Team Members
+
+
+import sqlalchemy as sa
+
+from buildbot.util import sautils
+
+
+def upgrade(migrate_engine):
+    metadata = sa.MetaData()
+    metadata.bind = migrate_engine
+
+    steps = sautils.Table('steps', metadata, autoload=True)
+
+    idx = sa.Index('steps_started_at',
+                   steps.c.started_at)
+    idx.create()