* [WIP] pull OHLCV records from Crypto Compare
* lint
* refactor to pull logic out of script and into modules
* add entity test for ohlcv_external entity
* implement rate limit and chronological backfill for ohlcv
* add unit tests; cleanup variable names
* Fetch OHLCV pairs params from events table
* better method names
* fix outdated test
* lint
* Clean up after review
* oops
* fix failing test
* better filtering of most recent records
* fix bug when generating pairs
* fix default earliest backfill date
* fix bug with retrieving backfill time
* prettier
* Introduce framework for running basic tests for entities
* Add pipeline tests to CircleCI config
* Make pipeline tests more configurable and fix CircleCI config
* Add coverage dir to pipeline package
* Add basic tests for all exchange event entities
* Add tests for remaining entities
* Create separate test scripts in package.json and add new info to README
* Update db_setup.ts to revert migrations even if you are using docker
* Automatically pull the postgres image if needed
* Add comment about why NumberToBigIntTransformer is needed
