better new functionality of column aliases

common/proto/table_definition.proto

@@ -22,6 +22,9 @@ service TableDefinition {
   // Pure data retrieval - no business logic.
   rpc GetProfileDetails(GetProfileDetailsRequest) returns (GetProfileDetailsResponse);
 
+  // Returns the stored rename history for column aliases in one profile.
+  rpc GetColumnAliasRenameHistory(GetColumnAliasRenameHistoryRequest) returns (GetColumnAliasRenameHistoryResponse);
+
   // Renames a user-visible column alias while keeping the physical column unchanged.
   rpc RenameColumnAlias(RenameColumnAliasRequest) returns (RenameColumnAliasResponse);
 
@@ -138,6 +141,31 @@ message GetProfileDetailsResponse {
   repeated TableDetail tables = 2;
 }
 
+// Request to fetch recorded column alias rename history for one profile.
+message GetColumnAliasRenameHistoryRequest {
+  string profile_name = 1;
+
+  // Optional filter. When omitted, returns all tables in the profile.
+  optional int64 table_definition_id = 2;
+}
+
+// One recorded column alias rename.
+message ColumnAliasRenameHistoryEntry {
+  int64 id = 1;
+  string profile_name = 2;
+  int64 table_definition_id = 3;
+  string table_name = 4;
+  string old_column_name = 5;
+  string new_column_name = 6;
+  string created_at = 7;
+}
+
+// Response with stored column alias rename history rows.
+message GetColumnAliasRenameHistoryResponse {
+  string profile_name = 1;
+  repeated ColumnAliasRenameHistoryEntry entries = 2;
+}
+
 // Describes a table with its columns and associated scripts.
 message TableDetail {
   string name = 1;