I need to migrate a large scientific database app to PostgreSQL
("PG").  I'm trying to determine if web.py is the way to go.

  It appears that web.py's "db" module is mostly for simple SQL, such
as SELECT, UPDATE, DELETE, etc.  I will need to work with UNION
queries, create tables on-the-fly, and deal with PG-specific date/time
types, not to mention use elaborate JOINs.  Basically, I will need to
feed custom SQL to PG, and have complete control.

  Forgive me if I don't have all this terminology right.  I am hacking
this fast, for an overview.  It looks like the only way to send a raw
query to a web.py DB connection is with the hidden "_db_execute"
method, which I don't think is good practice.  Is there an upfront
method to send raw SQL and get whatever PG sends back?

  If this is not what web.py is for, any suggestions?

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