David Osborne <da...@qcode.co.uk> writes:
> Hi, yes I've run "analyse" against the newly restored database. Should that
> be enough?

My apologies, you did say that further down in the original message.
It looks like the core of the problem is the poor rowcount estimation

                     ->  Bitmap Index Scan on stock_trans_product_idx 
(cost=0.00..31.42 rows=1465 width=0) (actual time=0.009..0.009 rows=0 loops=1)
                           Index Cond: (product_id = 2466420)
                           Buffers: shared hit=3

You might be able to improve that by raising the statistics target
for stock_trans.product_id.  I'm not sure why you weren't getting
bitten by the same issue in 9.1; but the cost estimates aren't
that far apart for the two plans, so maybe you were just lucky ...

                        regards, tom lane

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