The addition of guarded fields

People,

I need your help on an implementation issue. I am working on the addition of
guarded fields, and especially on the splitting of blocks in case some nets
inside a block get different guarded fields than others. What I have
implemented currently is that a block will be split into biggest possible
parts containing the same guarded information, so for instance:

inetnum:  193.252.0.0 - 193.252.254.0
netname:  FRANCE-TELECOM-BLOCK-5
...

And then add an AS number (from guardian files) to network 1 and 2, and a
different one to 3 and 4, and leave the rest as it is, will result in:

*in: 193.252.0.0
*na: FR-TELECOM-BLOCK-5
...

*in: 193.252.1.0 - 193.252.2.0
*na: FR-TELECOM-BLOCK-5
*as: AS1104
...

*in: 193.252.3.0 - 193.252.4.0
*na: FR-TELECOM-BLOCK-5
*as: AS786
...

*in: 193.252.5.0 - 193.252.254.0
*na: FR-TELECOM-BLOCK-5
...


This procedure works nicely but I still have some problems with this:

- its is VERY slow (and I do not know how to improve that)
- I still do not like the idea of splitting up blocks that are managed by
someone else
- In oder to keep the database size under control, we should also implement
generating blocks again from individual entries in the database, but then
again I am fiddling with someone elses data, which I do not like at all ...

Could we get some opinions ?

-Marten