make shard non-optional for _db_*() functions, so that we can add another option next...
make shard non-optional for _db_*() functions, so that we can add another option next...

exflickr/flamework,straup/flamework,cooperhewitt/flamework,cooperhewitt/flamework,cooperhewitt/flamework,exflickr/flamework,straup/flamework,cooperhewitt/flamework,exflickr/flamework,straup/flamework,straup/flamework