greenlight

greenlight

PostgreSQL

Installation

brew install postgresql@16

Run

Run once

LC_ALL="C" /opt/homebrew/opt/postgresql@16/bin/postgres -D /opt/homebrew/var/postgresql@16

Run as a backend service and restart at login

brew services start postgresql@16

Setup (One-time)

1. Connect to PSQL

psql postgres

1. Create database

CREATE DATABASE greenlight;

1. Connect to the database

\c greenlight

1. Create a new user

create role greenlight with login password '<any password>';

1. Create an extension

create extension if not exists citext;

Start and connect to DB

psql --host=localhost --dbname=greenlight --username=greenlight

Exit DB

\q
# or
exit

Migration

• Run migrations up

migrate -path=./migrations -database=<$DB_DSN> up

• Run migration down, i.e., rollback optional n versions. n=1, rollback the last version. n not exists: rollback all.

migrate -path=./migrations -database=<$DB_DSN> down <n>

• Check migration version

migrate -path=./migrations -database=<$DB_DSN> version

• Migrate up or down to a specific version, e.g, 1

migrate -path=./migrations -database=<$DB_DSN> goto 1

• Note 1, for PostgreSQL 15+, need to run GRANT ALL ON SCHEMA public TO <dd_user>; to avoid issues like

error: pq: permission denied for schema public

• Note 2, if migration has dirty database errors, such as

error: Dirty database version 2. Fix and force version.

Fix by running migrate -path=./migrations -database=<$DB_DSN> force <VERSION>