Heroku CLI not killing the postgres connections - heroku

Postgres db provisioned at Heroku runs out of DB connections very frequently which hinders debugging the application on local system.
While try killing the connection via Heroku CLI, nothing happens. It pops "Not Found" message. It seems the command is not able to locate the db within the heroku app.
Need some help on killing postgre DB connections, so as to debug the application.
I tried executing
heroku pg:info -a heroku-sizing-roi-dev
It returns
But the database is provisioned already with DB schema and tables created. I can browse the DB on heroku dashboard and connect it via Java application.

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