how do i seed my database
I've exposed my database on port 5432, i've also set the DATABASE_URL in the env.server file. Running wasp db seed returns this error: 
--- [Error] Can not connect to database: ---------------------------------------
The database needs to be running in order to execute this command. You can easily start a managed dev database with
--- [Error] Can not connect to database: ---------------------------------------The database needs to be running in order to execute this command. You can easily start a managed dev database with
wasp start db
