Opinionated wallabag article exporter to markdown format for logseq
The following requirements were made.

• all exported articles go into one markdown file
• only annotated wallabag articles are exported
• dates are automatically linked
• in the article markdown template empty newlines are removed to fulfill Logseq's markdown
• cache all exported articles and when syncing again use the wallabag's API support for since queries
• new articles, which are not yet cached, are only appended at the end of the markdown file
• ATM, changed articles are newly appended to the file
  • thus, creating duplicates
  • this was done to preserve articles being changed in Logseq only
  • of course a manual merge is needed if you changed that article in Logseq only and it was changed afterwards in wallabag
  • if it was not changed in Logseq, the old entry can of course be deleted (manually only)