PG_HOST=127.0.0.1
PG_PORT=5432
PG_USER=postgres
PG_PASSWORD=change-me
PG_DATABASE=dfguide

# 如果你更喜欢使用单个连接串，也可以改用：
# PG_URL=postgres://postgres:change-me@127.0.0.1:5432/dfguide