Add a slack warning before/after psql call
Add a slack warning before/after psql call

This should make it clearer when we are running an expensive query for
search export.

RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline,RNAcentral/rnacentral-import-pipeline