WIP: fetch only one page in DB when paginating, not entire list

[sypets]

todo (functionality)

• requires to replace array chunking (of list of pages to avoid limits in DB because of possible "too many placeholders in prepared statement), e.g. use temporary table
• requires to change DB query
• requires to change pagination, we currently use core functionality which requires to fetch entire list and then paginate

additional todo:

• create issue / issues

motivation

• performance
• use less memory (out of memory possible)
• "cleaner" / better solutions