To run this app:

1. Have a Redis on the Redis default port (if you have Sentry running locally, you probably already have this)
2. pip install sentry-sdk flask rq
3. FLASK_APP=tracing flask run
4. FLASK_APP=tracing flask worker
5. Go to http://localhost:5000/ and enter a base64-encoded string (one is prefilled)
6. Hit submit, wait for heavy computation to end
7. cat events | python traceviewer.py | dot -T svg > events.svg
8. open events.svg

The last two steps are for viewing the traces. Nothing gets sent to Sentry right now because Sentry does not deal with this data yet.