Move app.yaml to app.yaml.template and add app.yaml to svn:ignore in trunk/app. Each Google App Engine instance needs its own "application:" ID, and this should *not* be committed into the SoC SVN repository in trunk/app. (Individual deployment branches *will* have app.yaml files with Google App Engine application IDs in them, just not trunk/app.)

from django.core.management.base import AppCommand, CommandError

class Command(AppCommand):
    help = "RENAMED: see 'sqlcustom'"

    def handle(self, *apps, **options):
        raise CommandError("This command has been renamed. Use the 'sqlcustom' command instead.")