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Debugging query performance in postgres

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Hello,
We have a situation in which we had a dml query within a procedure that was running fine but suddenly the plan flipped and it started running longer. It took us a good amount of time to identify the cause and fix it. So I have below questions,
1)Do we have any data dictionary view or query available which gives us information on what were the queryids those are executing from within a procedure and how much time they are taking?
2)Also how to identify , if any specific queries has opted a different plan today as compared to past executions and also response time increased because of that?

Regards
Veem

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