During installation (or database migration), Stash only allows the input of a port and a hostname. This prevents the use of SSL-encrypted TCP connections to PostgreSQL, eg:

jdbc:postgresql://database-server:port/database?ssl=true

This value is documented here: http://jdbc.postgresql.org/documentation/81/ssl-client.html

Without this functionality, we are unable to connect to our database cluster, as non-SSL connections are not permitted.