buildbot scheduler with init build for new builder

config.py

class InitialBuild(schedulers.Periodic):

    @defer.inlineCallbacks
    def startBuild(self):
        if not self.enabled:
            return
        log.msg(str(self.builderNames))
        builder_name = self.builderNames[0]
        builder_id = yield self.master.db.builders.findBuilderId(builder_name)

        recent_builds = yield self.master.db.builds._getRecentBuilds(
            (self.master.db.model.builds.c.builderid == builder_id)
        )
        log.msg(str(recent_builds))
        if not recent_builds:
            super().startBuild()
        self.enabled = False