fixed issues with the import

common/proto/tables_data.proto

@@ -185,6 +185,9 @@ message PostTableDataResponse {
 
   // Journal created or updated by automatic accounting, when applicable.
   optional int64 journal_id = 5;
+
+  // Non-blocking data-quality warnings produced while inserting the row.
+  repeated string warnings = 6;
 }
 
 message BeginTableDataImportRequest {
@@ -218,9 +221,17 @@ message CommitTableDataImportRequest {
   string import_id = 1;
 }
 
+message TableDataImportWarning {
+  // Zero-based position in the staged import, matching failed-row metadata.
+  int64 row_index = 1;
+  string table_name = 2;
+  string message = 3;
+}
+
 message CommitTableDataImportResponse {
   bool success = 1;
   int64 inserted_rows = 2;
+  repeated TableDataImportWarning warnings = 3;
 }
 
 message AbortTableDataImportRequest {