Recover from corrupt ops-cron store and tighten cron tool schemas.

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

lib/store.js

@@ -216,11 +216,46 @@ export function createStore(options = {}) {
   async function load() {
     try {
       const raw = await readFile(filePath, 'utf8')
+      // Reject embedded NUL — JSON.parse would throw an opaque "Unexpected token".
+      if (raw.includes('\u0000')) {
+        const error = new Error(`ops-cron store is corrupt (NUL byte) at ${filePath}; moved aside and starting empty`)
+        error.code = 'STORE_CORRUPT'
+        try {
+          const bak = `${filePath}.corrupt.${Date.now()}.bak`
+          await writeFile(bak, raw, 'utf8')
+          error.message = `${error.message} (backup: ${bak})`
+        } catch {
+          // best-effort backup
+        }
+        console.warn(`[dsh-ops-cron] ${error.message}`)
+        state = emptyState()
+        loaded = true
+        await persist()
+        return snapshot()
+      }
       const parsed = JSON.parse(raw)
       state = hydrate(parsed)
     } catch (error) {
-      if (error && error.code === 'ENOENT') state = emptyState()
-      else throw error
+      if (error && error.code === 'ENOENT') {
+        state = emptyState()
+      } else if (error instanceof SyntaxError) {
+        const wrapped = new Error(`ops-cron store JSON parse failed at ${filePath}: ${error.message}`)
+        wrapped.code = 'STORE_CORRUPT'
+        wrapped.cause = error
+        try {
+          const raw = await readFile(filePath, 'utf8').catch(() => '')
+          if (raw) await writeFile(`${filePath}.corrupt.${Date.now()}.bak`, raw, 'utf8')
+        } catch {
+          // ignore
+        }
+        console.warn(`[dsh-ops-cron] ${wrapped.message}; starting empty store`)
+        state = emptyState()
+        loaded = true
+        await persist()
+        return snapshot()
+      } else {
+        throw error
+      }
     }
     loaded = true
     return snapshot()

lib/tools.js

@@ -41,9 +41,9 @@ const JOB_SCHEMA = {
     schedule: { type: 'object', additionalProperties: true },
     createdAt: { type: 'number' },
     updatedAt: { type: 'number' },
-    lastRunAt: {},
-    lastStatus: {},
-    nextRunAt: {},
+    lastRunAt: { type: ['number', 'null'] },
+    lastStatus: { type: ['string', 'null'] },
+    nextRunAt: { type: ['number', 'null'] },
   },
 }