Crowd directories which are uncached containing group memberships with a space in the group/username will cause a unique constraint or index violation; UK_MEM_DIR_PARENT_CHILD table: CWD_MEMBERSHIP when Stash is using MySQL

This is due to an issue in Crowd, which only affects uncached directories.
Directories are cached by default however.
Since it is not possible to configure an uncached directory in JIRA as a Crowd Server, this will not affect Stash instances using JIRA for auth.

See CWD-4338 for further details and status.