add: markdown deletion

api/markdown.py

@@ -268,7 +268,8 @@ def delete_markdown(markdown_id):
     """
     Delete a markdown document.
 
-    This endpoint deletes an existing markdown document.
+    This endpoint deletes an existing markdown document and cascades the deletion
+    to related settings to avoid foreign key conflicts.
     It requires authentication with the 'admin' role.
 
     Request:
@@ -280,18 +281,54 @@ def delete_markdown(markdown_id):
     Response Codes:
         - 200: Deleted successfully
         - 404: Markdown not found
+        - 500: Server error during cascade deletion
     """
     with get_db() as session:
-        markdown = session.get(Markdown, markdown_id)
-        if markdown is None:
-            logger.error(f"failed to delete markdown: {markdown_id}")
+        try:
+            markdown = session.get(Markdown, markdown_id)
+            if markdown is None:
+                logger.error(f"failed to delete markdown: {markdown_id}")
+                errno = RequestContext.get_error_id()
+                return jsonify({"error": f"file not found - {errno}"}), 404
+            
+            md = markdown.to_dict()
+            
+
+            if markdown.setting_id:
+                markdown_setting = session.query(MarkdownSetting).get(markdown.setting_id)
+                if markdown_setting:
+                    template_setting_id = markdown_setting.template_setting_id
+                    permission_setting_id = markdown_setting.permission_setting_id
+
+                    markdown_setting.template_setting_id = None
+                    markdown_setting.permission_setting_id = None
+                    session.flush()
+
+                    if template_setting_id:
+                        from db.models.MarkdownTemplateSetting import MarkdownTemplateSetting
+                        template_setting = session.query(MarkdownTemplateSetting).get(template_setting_id)
+                        if template_setting:
+                            session.delete(template_setting)
+                    
+                    if permission_setting_id:
+                        permission_setting = session.query(MarkdownPermissionSetting).get(permission_setting_id)
+                        if permission_setting:
+                            session.delete(permission_setting)
+
+                    session.delete(markdown_setting)
+
+            session.delete(markdown)
+            session.commit()
+            
+            markdown_deleted.send(None, payload=md)
+            logger.info(f"Successfully deleted markdown {markdown_id} with cascade deletion")
+            return jsonify(md), 200
+            
+        except Exception as e:
+            logger.error(f"Failed to delete markdown {markdown_id}: {e}")
             errno = RequestContext.get_error_id()
-            return jsonify({"error": f"file not found - {errno}"}), 404
-        md = markdown.to_dict()
-        session.delete(markdown)
-        session.commit()
-        markdown_deleted.send(None, payload=md)
-        return jsonify(md), 200
+            session.rollback()
+            return jsonify({"error": f"delete failed - {errno}"}), 500
 
 
 @markdown_bp.route('/move_forward/<int:markdown_id>', methods=['PATCH'])