phonenumber api adjustement

common/proto/table_structure.proto

@@ -75,4 +75,13 @@ message TableColumn {
   // True for a user-defined column whose logic should be recomputed whenever
   // one of its dependencies changes. False for system and foreign-key columns.
   bool recompute_on_dependency_change = 5;
+
+  // True when the server created this as a companion of another logical column.
+  bool generated = 6;
+
+  // True when clients must not submit edits for this column.
+  bool read_only = 7;
+
+  // Logical source column name, empty for ordinary and system columns.
+  string generated_from = 8;
 }