Cleanup UDS entry creation
timeline and baloosearch almost duplicate the UDS creation code, although the code in timeline is somewhat incomplete/buggy (UID/GID as integer, instead of as a string as required).
The one in tags was quite incomplete and caused high I/O load e.g. for thumbnail generation and did not show the original path nor any metadata columns in dolphin, see e.g. https://bugs.kde.org/show_bug.cgi?id=419429