Add not null checks to wt_private_id, wt_scope_id, and wt_user_id (#284)

internal/db/migrations/postgres/22_static_host.up.sql

@@ -37,8 +37,10 @@ begin;
 */
 
   create table static_host_catalog (
-    public_id wt_public_id primary key,
-    scope_id wt_scope_id not null
+    public_id wt_public_id
+      primary key,
+    scope_id wt_scope_id
+      not null
       references iam_scope (public_id)
       on delete cascade
       on update cascade,