Hi,
You should search informations about postgres hooks like thoses used in
extension pg_stat_statements
https://github.com/postgres/postgres/blob/master/contrib/pg_stat_statements/pg_stat_statements.c
And about background capabilities as thoses used in extension pg_background
https://github.com/vibhorkum/pg_background
There are also extensions working with indexes like hypopg
https://github.com/HypoPG/hypopg
Good luck
Regards
PAscal
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