table revision number

common/proto/table_structure.proto

@@ -143,6 +143,8 @@ message GetTableImportDescriptorResponse {
   string storage_profile_name = 2;
   string table_name = 3;
   int64 table_id = 4;
+  // Version of this import contract. Send it as expected_table_revision on
+  // every staged chunk so schema/rule changes refuse stale prepared data.
   int64 table_revision = 5;
   repeated ImportFieldDescriptor fields = 6;
 }

common/proto/tables_data.proto

@@ -199,6 +199,9 @@ message StageTableDataImportRequest {
   string import_id = 1;
   string table_name = 2;
   repeated TableDataImportRow rows = 3;
+  // Import-contract revision returned by GetTableImportDescriptor. A zero
+  // value is accepted for older clients and snapshots the current revision.
+  int64 expected_table_revision = 4;
 }
 
 message TableDataImportRow {