fix(query): preserve original backend errors with fallback detail

apps/desktop/src/composables/__tests__/useSqlExecution.spec.ts

@@ -1023,7 +1023,24 @@ SELECT @value AS Message;`;
       if (!tab) return;
       const successfulResult = { columns: ["value"], rows: [[1]], affected_rows: 0, execution_time_ms: 1 };
       tab.result = successfulResult;
-      tab.results = [successfulResult, { columns: ["Error"], execution_error: true, rows: [["Duplicate entry '1'"]], affected_rows: 0, execution_time_ms: 1 }];
+      tab.results = [
+        successfulResult,
+        {
+          columns: ["Error"],
+          execution_error: true,
+          error: {
+            version: 1,
+            code: "DBX-LEGACY-0001",
+            messageKey: "backendErrors.legacy",
+            messageParams: {},
+            source: "legacyBackend",
+            operationOutcome: "unknown",
+          },
+          rows: [["Duplicate entry '1'"]],
+          affected_rows: 0,
+          execution_time_ms: 1,
+        },
+      ];
       tab.activeResultIndex = 0;
     });
     const addHistory = vi.spyOn(historyStore, "add").mockResolvedValue(undefined);
@@ -1038,7 +1055,13 @@ SELECT @value AS Message;`;
 
     await execution.tryExecute();
 
-    expect(addHistory).toHaveBeenCalledWith(expect.objectContaining({ success: false, error: "Duplicate entry '1'", affected_rows: undefined }));
+    expect(addHistory).toHaveBeenCalledWith(
+      expect.objectContaining({
+        success: false,
+        error: "backendErrors.unknown\n\nDuplicate entry '1'",
+        affected_rows: undefined,
+      }),
+    );
     expect(refreshObjects).not.toHaveBeenCalled();
   });
 

apps/desktop/src/composables/useSqlExecution.ts

@@ -27,6 +27,7 @@ import type { ConnectionConfig, DatabaseType, QueryTab } from "@/types/database"
 import type { MultiDbExecutionTarget, MultiDbResultRunExecution, MultiDbTargetExecutionResult } from "@/types/sqlExecution";
 import { effectiveDatabaseTypeForConnection } from "@/lib/database/jdbcDialect";
 import type { SqlExecutionTargetContext } from "@/lib/database/sqlExecutionTargetRegistry";
+import { translateBackendError } from "@/i18n/backend-errors";
 
 const DANGER_RE = /^\s*(DROP|DELETE|TRUNCATE|ALTER|UPDATE|MERGE|REPLACE)\b/i;
 
@@ -348,7 +349,7 @@ export function useSqlExecution(deps: {
       sql,
       execution_time_ms: elapsed,
       success,
-      error: failure ? String(failure.rows?.[0]?.[0] ?? "") : undefined,
+      error: failure ? (failure.error ? translateBackendError(t, failure.error, failure.rows?.[0]?.[0]) : String(failure.rows?.[0]?.[0] ?? "")) : undefined,
       activity_kind: classifySqlActivityKind(sql),
       operation: primarySqlOperation(sql),
       affected_rows: success ? tab.result?.affected_rows : undefined,
@@ -484,7 +485,7 @@ export function useSqlExecution(deps: {
       }
       focusSqlServerDataResult(executionTabId, connection.db_type, latest);
       const failure = firstQueryExecutionError(latest);
-      const errorMessage = failure ? String(failure.rows?.[0]?.[0] ?? t("common.failed")) : undefined;
+      const errorMessage = failure ? (failure.error ? translateBackendError(t, failure.error, failure.rows?.[0]?.[0]) : String(failure.rows?.[0]?.[0] ?? t("common.failed"))) : undefined;
       const success = !failure;
       const resultStatus = success ? "success" : "failed";
       captureWorkerResult(resultStatus, errorMessage);