Partial indexes instead of partitions

HI all,

I have a very big table (2000 inserts per sec, I have to store 20 days of data).
The table has 2 indexes, in columns that have almost-random values.

Since keeping those two indexes up-to-date can't be done (updating 2000
times per second 2 indexes with random values on such a huge table is
impossible) I thought that partitioning was the way to go.

Now I think I have 2 options:

a) create 480 partitions, 1 for each hour of the day. 2 indexes on each
partition
b) create 20 partitions, and create 24*2 partial indexes on the current
partition; then the next day (overnight) create 2 global indexes for the
table and drop the 24*2 indexes...

I thought about option b) because I don't like the fact that the planner takes
"ages" to plan a query in case there are 480 partitions; in option b) I would
have:

19 partitions with 2 indexes each
1 partition (the "current day" one) with 24*2 partial indexes

Does it make sense? Anyone has ever used partial indexes instead of
partitions?