how to push database to heroku
heroku run rails db:migrate
local pg_sql to heroku pg_sql
# set the password in an environment variable
export PGPASSWORD=mypassword # linux/mac
set PGPASSWORD=mypassword # windows
# create the database dump
$ pg_dump -Fc --no-acl --no-owner -h localhost -U myuser mydb > mydb.dump
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