* Get stats from clickhosue
* Pull stats from clickhouse
* Use correct Query namespace
* Use Clickhouse in unit tests
* Use Clickhouse in stats controller tests
* Use fixtures for unit tests
* Add Clickhouse to travis
* Use Clickhouse session store for sessions
* Add garbage collection to session store
* Reload session state from Clickhouse on server restart
* Query from sessions table
* Trap exits in event write buffer
* Run hydration without starting the whole app
* Make session length 30 minutes
* Revert changes to fingerprint schema
* Remove clickhouse from fingerprint sessions
* Flush buffers before shutdown
* Use old stats when merging
* Remove old session schema
* Fix tests with CH sessions
* Add has_pageviews? to Stats
* WIP
* Get all stats from Clickhouse
* Use https dependency
* Do not namespace db tables in hydrate task
* Update hydration task
* Ingest data to clickhouse
* Double-write to both Clickhouse and Postgres
* Add test setup
* Keep old stats module
* Prepare for live ingestion test
