Improve performance of delete device messages query

[MatMaul]

cf #16479.

Signed-off-by: Mathieu Velten matmaul@gmail.com

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[MatMaul]

I am getting less rows deleted with this new query (10 instead of 12), I need to check why. All is fine.
cf #16479 (comment) for more infos and PG plans for old and new queries.

[MatMaul]

I think this is fine so undrafting it, but it may be useful to check a plan on pg11 with the new query.

[erikjohnston]

Woo, thanks!