Before starting the application you should create db. You can do it through pgAdmin.
For remote DB management should use pgAdmin 13
# Only for dev; Heroku set instance port automatically
PORT=
# For all environmets
ENV= DEV | STAGE | PROD
DB_NAME=
DB_USER=
DB_PASSWORD=
DB_HOST=
DB_PORT
ETH_PROVIDER_URL=
ETH_WS_PROVIDER_URL=