Add created_at to all models. (#10)
Add created_at to all models. (#10)

moritz9/redash,EverlyWell/redash,M32Media/redash,guaguadev/redash,EverlyWell/redash,crowdworks/redash,akariv/redash,guaguadev/redash,chriszs/redash,ninneko/redash,pubnative/redash,useabode/redash,akariv/redash,M32Media/redash,chriszs/redash,stefanseifert/redash,imsally/redash,alexanderlz/redash,EverlyWell/redash,rockwotj/redash,vishesh92/redash,ninneko/redash,getredash/redash,moritz9/redash,pubnative/redash,guaguadev/redash,useabode/redash,44px/redash,M32Media/redash,crowdworks/redash,denisov-vlad/redash,jmvasquez/redashtest,easytaxibr/redash,hudl/redash,vishesh92/redash,jmvasquez/redashtest,akariv/redash,amino-data/redash,44px/redash,44px/redash,getredash/redash,amino-data/redash,denisov-vlad/redash,rockwotj/redash,getredash/redash,amino-data/redash,hudl/redash,crowdworks/redash,M32Media/redash,stefanseifert/redash,moritz9/redash,alexanderlz/redash,imsally/redash,chriszs/redash,stefanseifert/redash,easytaxibr/redash,imsally/redash,stefanseifert/redash,useabode/redash,EverlyWell/redash,crowdworks/redash,rockwotj/redash,vishesh92/redash,pubnative/redash,pubnative/redash,hudl/redash,44px/redash,jmvasquez/redashtest,stefanseifert/redash,moritz9/redash,denisov-vlad/redash,ninneko/redash,alexanderlz/redash,denisov-vlad/redash,guaguadev/redash,guaguadev/redash,alexanderlz/redash,akariv/redash,chriszs/redash,getredash/redash,pubnative/redash,imsally/redash,hudl/redash,jmvasquez/redashtest,easytaxibr/redash,jmvasquez/redashtest,easytaxibr/redash,easytaxibr/redash,ninneko/redash,denisov-vlad/redash,vishesh92/redash,rockwotj/redash,ninneko/redash,akariv/redash,useabode/redash,amino-data/redash,getredash/redash