In Postgres it's possible to create an readonly column,

See
https://www.postgresql.org/docs/current/sql-createtable.html

GENERATED ALWAYS AS ( generation_expr ) STORED
This clause creates the column as a generated column. The column cannot be written to, and when read the result of the specified expression will be returned.

Automatic generated SQL for INSERT OR UPDATE don't handle the column as readonly. If you set UpdateAllFields to true an exception is raised. Also an exception occurs when you change the value of this field an call Post.

The column should be set to readonly an the corresponding field should be excluded from INSERT andUPDATE.