Yes, according to the documentation this should be a valid query. I tried to pull the latest image of ehrbase yesterday and tried to re-run my docker container. EHRBase version is now 0.22.0-SNAPSHOT, Spring Boot 2.5.12 and PostgreSQL 13.4. However, I believe that there is some process ongoing, as I cannot access the server. The log shows me
2022-05-16 13:29:29.508 INFO [] 9 — [ main] org.ehrbase.application.EhrBase : The following 1 profile is active: “docker”
2022-05-16 13:29:31.616 INFO [] 9 — [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-05-16 13:29:31.627 INFO [] 9 — [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-05-16 13:29:31.628 INFO [] 9 — [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.60]
2022-05-16 13:29:31.723 INFO [] 9 — [ main] o.a.c.c.C.[.[localhost].[/ehrbase] : Initializing Spring embedded WebApplicationContext
2022-05-16 13:29:31.723 INFO [] 9 — [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2162 ms
2022-05-16 13:29:32.180 INFO [] 9 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2022-05-16 13:29:32.306 INFO [] 9 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2022-05-16 13:29:32.331 INFO [] 9 --- [ main] o.f.c.internal.license.VersionPrinter : Flyway Community Edition 8.4.4 by Redgate
2022-05-16 13:29:32.332 INFO [] 9 --- [ main] o.f.c.i.database.base.BaseDatabaseType : Database: jdbc:postgresql://ehrdb:5432/ehrbase (PostgreSQL 13.4)
2022-05-16 13:29:32.376 INFO [] 9 --- [ main] o.f.c.i.c.SqlScriptCallbackFactory : Executing SQL callback: beforeValidate -
2022-05-16 13:29:32.490 INFO [] 9 --- [ main] o.f.core.internal.command.DbValidate : Successfully validated 72 migrations (execution time 00:00.094s)
2022-05-16 13:29:32.506 INFO [] 9 --- [ main] o.f.c.i.c.SqlScriptCallbackFactory : Executing SQL callback: beforeMigrate -
2022-05-16 13:29:32.516 INFO [] 9 --- [ main] o.f.core.internal.command.DbMigrate : Current version of schema "ehr": 70
2022-05-16 13:29:32.523 INFO [] 9 --- [ main] o.f.core.internal.command.DbMigrate : Migrating schema "ehr" to version "71 - merge duplicate users"
. This was 18h ago - still nothing 
I also created a topic on this:
After pulling latest image, Migrating Schema EHR takes long - openEHR - I would appreciate it if you have any idea whats going on here.