Achilles Heel test for era building

[schuemie]

There are currently no test for whether the era building went OK, even though it is easy to make mistakes there.

I'm currently using a simple test: I'm comparing the results of these two queries:

SELECT DISTINCT person_id, condition_concept_id FROM condition_occurrence;
SELECT DISTINCT person_id, condition_concept_id FROM condition_era;

and they should be identical. (It would be easy to test this through a join I guess). If that doesn't scale to bigger databases, at least we could count the number of people with a condition and compare those counts.
For drug_era we'd first need to map to ingredients, but otherwise it would be the same.