brew/postgresql@11

created default db cluster
    initdb --locale=C -E UTF-8 /usr/local/var/postgresql@11
for details
    https://www.postgresql.org/docs/11/app-initdb.html

to restart
    brew services restart postgresql@11
if no service needed
    /usr/local/opt/postgresql@11/bin/postgres -D /usr/local/var/postgresql@11

echo 'export PATH="/usr/local/opt/postgresql@11/bin:$PATH"' >> ~/.zshrc

issues
https://stackoverflow.com/questions/15301826/psql-fatal-role-postgres-does-not-exist
    /usr/local/opt/postgresql@11/bin/createuser -s postgres