validation1 for the form

common/proto/table_validation.proto

@@ -0,0 +1,56 @@
+// common/proto/table_validation.proto
+syntax = "proto3";
+package komp_ac.table_validation;
+
+// Request validation rules for a table
+message GetTableValidationRequest {
+  string profile_name = 1;
+  string table_name = 2;
+}
+
+// Response with field-level validations; if a field is omitted,
+// no validation is applied (default unspecified).
+message TableValidationResponse {
+  repeated FieldValidation fields = 1;
+}
+
+// Field-level validation (extensible for future kinds)
+message FieldValidation {
+  // MUST match your frontend FormState.data_key for the column
+  string data_key = 1;
+
+  // Current: only CharacterLimits. More rules can be added later.
+  CharacterLimits limits = 10;
+  // Future expansion:
+  // PatternRules pattern = 11;
+  // DisplayMask mask = 12;
+  // ExternalValidation external = 13;
+  // CustomFormatter formatter = 14;
+}
+
+// Character length counting mode
+enum CountMode {
+  COUNT_MODE_UNSPECIFIED = 0; // default: same as CHARS
+  CHARS = 1;
+  BYTES = 2;
+  DISPLAY_WIDTH = 3;
+}
+
+// Character limit validation (Validation 1)
+message CharacterLimits {
+  // When zero, the field is considered "not set". If both min/max are zero,
+  // the server should avoid sending this FieldValidation (no validation).
+  uint32 min = 1;
+  uint32 max = 2;
+
+  // Optional warning threshold; when unset, no warning threshold is applied.
+  optional uint32 warn_at = 3;
+
+  CountMode count_mode = 4; // defaults to CHARS if unspecified
+}
+
+// Service to fetch validations for a table
+service TableValidationService {
+  rpc GetTableValidation(GetTableValidationRequest)
+      returns (TableValidationResponse);
+}