To migrate existing data from a previous major version of PostgreSQL run:
brew postgresql-upgrade-database
This formula has created a default database cluster with:
initdb --locale=C -E UTF-8 /opt/homebrew/var/postgres
For more details, read:
https://www.postgresql.org/docs/14/app-initdb.html
To restart postgresql after an upgrade:
brew services restart postgresql
Or, if you don't want/need a background service you can just run:
/opt/homebrew/opt/postgresql/bin/postgres -D /opt/homebrew/var/postgres
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