Dear list,

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.

And other questions of this sort.

Thank you very much!

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