I'm interested in pgsql, and would like to know more about the design decisions behind it's features.
Where should I search in order to know more about subjects, for example:
Why in the roles system, user are actually roles with login attribute and not a separate entity.
Why to read from a table, both a usage permission on the schema and a read access permission on the table is needed? Alternatively, there could be a usage permission on schema just to alter the schema itself or add tables to it, and not require it in the case of selecting from a table from inside it.
