message: Add updated DB setup to .env.SAMPLE
diff: @@ -9,3 +9,15 @@ LEDGER_EMISSION_TOKEN_CONTRACT_ADDRESS="0x610178dA211FEF7D417bC0e6FeD39F05609AD7
  # Moralis API_KEY
  MORALIS_API_KEY=
  +#
  +# Optional DB config
  +#
  +# DB connection user name and password if different from the current shell user
  +#DB_USER=
  +#DB_PASSWORD=
  +# DB database name if different than the default of blockchain-carbon-accounting
  +#DB_NAME=blockchain-carbon-accounting
  +#DB_HOST=127.0.0.1
  +#DB_PORT=5432
  +# For debugging DB queries
  +#DB_VERBOSE=Y
  