As an aside: OpalStack is great for us ex-WebFaction folks so glad to see that things seem to continue moving forward. Anyway...
Using Adminer, I ran SELECT version(); and get:
PostgreSQL 11.9 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
v11.9 is about 5 years old, and not even the latest minor release in the 11 series - v11.17 per https://www.postgresql.org/support/versioning/
I'm certainly not a DB admin so I'm not particularly enthusiastic about installing my own.
Any thoughts from the community and from Opalstack?