#793 Ad-Hoc Queries

[KosherJava]

This would be similar to the search page, but in a way more similar to creating an ad-hoc SQL query, that would return a list similar to the search results. I envision something that would use dropdowns to be able to build queries like:

1) show me all people who died in the USA since 1960 who do not have sources for their deaths
2) All people who have a non null death date and no source

etc