fixes and improvements

backend/src/media_library_viewer_api/routers/tasks.py

@@ -159,6 +159,8 @@ def run_task(
     machine_name = _machine_label(machine)
     try:
         result = client.run(command, timeout=1200)
+        stdout = result.stdout or ""
+        stderr = result.stderr or ""
         status_text = "success" if result.exit_status == 0 else "error"
         store.record_task_run(
             task,
@@ -167,9 +169,9 @@ def run_task(
             machine_name=machine_name,
             task_type=task_type,
             duration_ms=int((time.perf_counter() - start) * 1000),
-            stdout_tail=result.stdout[-4000:],
-            stderr_tail=result.stderr[-4000:],
-            error="" if result.exit_status == 0 else (result.stderr or result.stdout or "Task failed"),
+            stdout_tail=stdout[-4000:],
+            stderr_tail=stderr[-4000:],
+            error="" if result.exit_status == 0 else (stderr or stdout or "Task failed"),
         )
         return {
             "task_id": task["id"],
@@ -178,20 +180,31 @@ def run_task(
             "machine_name": machine_name,
             "task_type": task_type,
             "exit_status": result.exit_status,
-            "stdout": result.stdout,
-            "stderr": result.stderr,
+            "stdout": stdout,
+            "stderr": stderr,
         }
     except Exception as exc:
+        duration_ms = int((time.perf_counter() - start) * 1000)
+        error_text = str(exc)
         store.record_task_run(
             task,
             "error",
             machine_id=str(machine.get("id") or ""),
             machine_name=machine_name,
             task_type=task_type,
-            duration_ms=int((time.perf_counter() - start) * 1000),
+            duration_ms=duration_ms,
             stdout_tail="",
-            stderr_tail="",
-            error=str(exc),
+            stderr_tail=error_text[-4000:],
+            error=error_text,
         )
         logger.exception("Task execution failed task_id=%s", task["id"])
-        raise
+        return {
+            "task_id": task["id"],
+            "task_name": task["name"],
+            "machine_id": str(machine.get("id") or ""),
+            "machine_name": machine_name,
+            "task_type": task_type,
+            "exit_status": 1,
+            "stdout": "",
+            "stderr": error_text,
+        }