default setup config from docker compose.

this is similar to running from command line goose postgres "host=localhost port=5432 user=xyz dbname=abc password=ppp sslmode=disable" up.

this is needed to check if .sql files exist in migrations folder.

PS: When Open() is called, it is the responsibility of the caller to close the DB connection with db.Close().

min bytes for each session token.

As of now this interface is not so much useful.