diff --git a/wwwroot/api/instance_create.dspy b/wwwroot/api/instance_create.dspy
index 703e6c1..cffee1e 100644
--- a/wwwroot/api/instance_create.dspy
+++ b/wwwroot/api/instance_create.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Create approval instance"""
-import json, time, uuid
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -25,7 +24,7 @@ try:
             workflows = await sor.sqlExe("SELECT id FROM approval_workflow WHERE id=${id}$ AND status='Y'", {'id': workflow_id})
             if not workflows:
                 result['options'] = {'title': 'Error', 'message': '工作流不存在或未激活', 'type': 'error'}
-                return json.dumps(result, ensure_ascii=False)
+                return result
 
             first_step = await sor.sqlExe("SELECT id, step_number FROM approval_step WHERE workflow_id=${workflow_id}$ ORDER BY step_number ASC LIMIT 1", {'workflow_id': workflow_id})
             
@@ -57,4 +56,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'创建失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/step_create.dspy b/wwwroot/api/step_create.dspy
index c7ca334..f5ea7b0 100644
--- a/wwwroot/api/step_create.dspy
+++ b/wwwroot/api/step_create.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Create approval step"""
-import json, uuid
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -37,4 +36,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'创建失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/step_delete.dspy b/wwwroot/api/step_delete.dspy
index 038257e..d7a0f0c 100644
--- a/wwwroot/api/step_delete.dspy
+++ b/wwwroot/api/step_delete.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Delete approval step"""
-import json
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -21,4 +20,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'删除失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/step_update.dspy b/wwwroot/api/step_update.dspy
index fef549b..1800714 100644
--- a/wwwroot/api/step_update.dspy
+++ b/wwwroot/api/step_update.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Update approval step"""
-import json
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -41,4 +40,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'更新失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/workflow_create.dspy b/wwwroot/api/workflow_create.dspy
index a2133b1..8bcb1c8 100644
--- a/wwwroot/api/workflow_create.dspy
+++ b/wwwroot/api/workflow_create.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Create approval workflow"""
-import json, time, uuid
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -34,4 +33,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'创建失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/workflow_delete.dspy b/wwwroot/api/workflow_delete.dspy
index 8f5b662..7c0f967 100644
--- a/wwwroot/api/workflow_delete.dspy
+++ b/wwwroot/api/workflow_delete.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Delete approval workflow"""
-import json
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -22,4 +21,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'删除失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result
diff --git a/wwwroot/api/workflow_update.dspy b/wwwroot/api/workflow_update.dspy
index 97b2f89..e6a0bd7 100644
--- a/wwwroot/api/workflow_update.dspy
+++ b/wwwroot/api/workflow_update.dspy
@@ -1,7 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 """Update approval workflow"""
-import json, time
 
 result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid request', 'type': 'error'}}
 
@@ -37,4 +36,4 @@ try:
 except Exception as e:
     result['options'] = {'title': 'Error', 'message': f'更新失败: {str(e)}', 'type': 'error'}
 
-return json.dumps(result, ensure_ascii=False)
+return result