As a first step, before relaunching the query with a new plan I would be
happy to be able to get information about sql queries having wrong

Maybe thoses SQL queries could be collected using something similar to
"auto_explain" module (tracing finished or cancelled queries).

If the "corrected plan" taking into account real cardinalities was proposed
(with some advices on how to get it) it would be a great tuning adviser ;o)

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