def storage_keys(self):
if not self._module:<EOL><INDENT>return []<EOL><DEDENT>self._storage_init()<EOL>module_name = self._module.module_full_name<EOL>return self._storage.storage_keys(module_name)<EOL>
Return a list of the keys for values stored for the module.

Keys will contain the following metadata entries:
- '_ctime': storage creation timestamp
- '_mtime': storage last modification timestamp