validation2 I dont know if its correct???

common/proto/table_validation.proto

@@ -23,9 +23,10 @@ message FieldValidation {
   CharacterLimits limits = 10;
   // Future expansion:
   // PatternRules pattern = 11;
-  // DisplayMask mask = 12;
+  DisplayMask mask = 3;
   // ExternalValidation external = 13;
   // CustomFormatter formatter = 14;
+  bool required = 4;
 }
 
 // Character length counting mode
@@ -49,6 +50,13 @@ message CharacterLimits {
   CountMode countMode = 4; // defaults to CHARS if unspecified
 }
 
+// Mask for pretty display
+message DisplayMask {
+  string pattern = 1;              // e.g., "(###) ###-####" or "####-##-##"
+  string input_char = 2;           // e.g., "#"
+  optional string template_char = 3; // e.g., "_"
+}
+
 // Service to fetch validations for a table
 service TableValidationService {
   rpc GetTableValidation(GetTableValidationRequest)