postgre uuid-ossp


```typeCREATE EXTENSION IF NOT EXISTS "uuid-ossp";select uuid_generate_v4()```

> [Generating a UUID in Postgres for Insert statement?](https://stackoverflow.com/questions/12505158/generating-a-uuid-in-postgres-for-insert-statement)

> [uuid-ossp](https://www.postgresql.org/docs/9.4/uuid-ossp.html)
