working with temp tables in any webapp is kinda scary, just because temp 
tables (at least in sql world) are actually though to survive an entire 
"connection". If instead you mean "temp table" as a real table, that gets 
created and dropped (so, managed) entirely by your application, again 
you'll find hard times managing concurrency, auto-expiration and such.
If strictly needed, I'd go with a fixed table ... something like
user_id ref_id
1          2
1          10
1          16

with indexes on both fields and manage the join as db.x.art_id = 
db.fixed.ref_id & db.fixed.user_id == 1 .
You can then manage expiration, renewal, updates, and such just doing 
db(db.fixed.user_id == 1).delete(), etc.


-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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