[development] Temporary database credentials

[Moshe Weitzman]

> I looked at the MySQL documentation for a bit and didn't notice anything 
> particularly useul. SHOW GRANTS shows things for the current user, but 
> not inherited permissions. And the output is in multiple rows of strings 
> that have to be parsed.
> 
> How are things looking on Postgres and SQLite?
> 

instead of parsing, i suggest just trying the operation (create table, 
alter, etc.). thats guaranteed portable.