"No runners found" needs to die. A.k.a, How do I define a global default data source?

How do I define a global default data source and schema for all projects? I have exactly 1 configured database connection. Within that single connection I have exactly 1 schema. I should not have to first select a runner when I execute a SQL file when there is one and only one possible choice for a connection and schema.

How do I set a default connection and schema for all projects?