API endpoint for getting failed content keys

[mrferris]

Glados should have an API endpoint and a simple web dashboard feature for getting a list of content keys that had failed recently. This is useful for both manual debugging and for feeding into a bridge node to intelligently plug holes in the dataset.

Previously I made a script for nick to do this for manually debugging:

ssh glados "psql postgres://postgres:password@localhost:5432/glados -c \"\\copy (SELECT DISTINCT c.content_key FROM content c JOIN content_audit ca ON c.id = ca.content_key WHERE ca.result = 0 AND ca.strategy_used = 5 AND ca.created_at >= CURRENT_TIMESTAMP - INTERVAL '24 hours') TO '/home/devops/failed_4444s.txt';\"" && scp glados:/home/devops/failed_4444s.txt ~/failed_4444s.txt

[Ktl-XV]

@mrferris can I take this issue?