@@ -83,0 +92,4 @@
+    public Map<String, Object> postProcess(final E entity, final Map<String, Object> config) {
+        final var copy = new HashMap<>(config);
+        stream(propertyValidators).forEach(p -> {
+            if ( p.writeOnly) {

@@ -0,0 +43,4 @@
+        return this;
+    }
+
+    public StringProperty hidden() {

@@ -33,2 +33,4 @@
     private Boolean required;
     private T defaultValue;
+    protected Function<PropertiesProvider, T> computedBy;
+    protected boolean computed; // used in descriptor, because computedBy cannot be rendered to a text string

@@ -201,0 +231,4 @@
+        return this;
+    }
+
+    public boolean isComputed() {

@@ -12,0 +82,4 @@
+                "'UNIX_USER:abc00-temp.config.SSD soft quota' is expected to be at most 100 but is 200",
+                "'UNIX_USER:abc00-temp.config.HDD hard quota' is expected to be at most 0 but is 100",
+                "'UNIX_USER:abc00-temp.config.HDD soft quota' is expected to be at most 100 but is 200",
+                "'UNIX_USER:abc00-temp.config.shell' is expected to be one of [/bin/false, /bin/bash, /bin/csh, /bin/dash, /usr/bin/tcsh, /usr/bin/zsh, /usr/bin/passwd] but is '/is/invalid'",