MLH17 on "[Plugin: Popup Maker] huge problem with database size !"

@Daniel - Thanks for your reply.
A friend of mine, a database specialist, helped me with cleaning, and he said the empty entries of popup 'occupied' about 12 MB in the database.
Thanks a lot for the hint with the revisions - I will check this; perhaps this is the main problem - I will report.
kind regards
Markus