c0cabc82f6
Since each revision now has files, associate comments with the file relation rather than revisions so that the path is not stored twice in the database. Also correct a problem where comments could be left on empty files or lines that are not in a file in the unified view. The SQLAlchemy constraints API seems to have changed between 0.9.9 and 1.0.4. Support both behaviors to be user-friendly even though we now specify 1.0.4. Change-Id: If6593d279a432ea8a48f4bd74a157e4978e69eaa
Generic single-database configuration.