fix(mindspace): 修复删除时无法解析 MySQL JSON 导致页面复活

source_snapshot_json 在 mysql2 中已是对象，JSON.parse 失败会使 relative_path 丢失、工作区 HTML 未清理；同步后页面重新出现。

Co-authored-by: Cursor <cursoragent@cursor.com>

mindspace-pages.mjs

@@ -29,6 +29,16 @@ function asNumber(value) {
   return Number(value ?? 0);
 }
 
+export function parseJsonColumn(value, fallback = {}) {
+  if (value == null || value === '') return { ...fallback };
+  if (typeof value === 'object' && !Buffer.isBuffer(value)) return value;
+  try {
+    return JSON.parse(String(value));
+  } catch {
+    return { ...fallback };
+  }
+}
+
 function pageError(message, code, details) {
   return Object.assign(new Error(message), { code, details });
 }
@@ -730,7 +740,7 @@ export function createPageService(pool, options = {}) {
     );
     let snapshot = {};
     try {
-      snapshot = JSON.parse(rows[0]?.source_snapshot_json ?? '{}');
+      snapshot = parseJsonColumn(rows[0]?.source_snapshot_json);
     } catch {
       snapshot = {};
     }
@@ -1084,7 +1094,7 @@ export function createPageService(pool, options = {}) {
          LIMIT 1`,
         [pageId, userId],
       );
-      const snapshot = JSON.parse(rows[0]?.source_snapshot_json ?? '{}');
+      const snapshot = parseJsonColumn(rows[0]?.source_snapshot_json);
       workspaceHtmlRelativePath = snapshot.relative_path ?? null;
     } catch {
       workspaceHtmlRelativePath = null;
@@ -1166,7 +1176,10 @@ export function createPageService(pool, options = {}) {
       publishDir: workspacePublishDir,
       htmlRelativePath: workspaceHtmlRelativePath,
       html: page.content ?? '',
-    }).catch(() => ({ removed: [], skipped: [] }));
+    }).catch((error) => {
+      console.warn('[MindSpace] workspace purge failed:', error?.message ?? error);
+      return { removed: [], skipped: [] };
+    });
 
     return { ...result, workspaceFilesRemoved: purgeResult.removed ?? [] };
   };
@@ -1190,7 +1203,7 @@ export function createPageService(pool, options = {}) {
     const content = await fs.readFile(storagePath, 'utf8');
     let snapshot = {};
     try {
-      snapshot = JSON.parse(row.source_snapshot_json ?? '{}');
+      snapshot = parseJsonColumn(row.source_snapshot_json);
     } catch {
       snapshot = {};
     }
@@ -1375,6 +1388,7 @@ export const pageInternals = {
   escapeHtml,
   normalizePageInput,
   normalizeListPageFilters,
+  parseJsonColumn,
   renderContent,
   renderPreviewHtml,
   renderHtmlPreview,