diff --git a/apps/desktop/src/main/browser/browser-profile.ts b/apps/desktop/src/main/browser/browser-profile.ts
index 2ddbe81..8d71f3e 100644
--- a/apps/desktop/src/main/browser/browser-profile.ts
+++ b/apps/desktop/src/main/browser/browser-profile.ts
@@ -306,8 +306,15 @@ async function readSourceCookies(root: string, staging: string): Promise<SourceC
 
   const db = new DatabaseSync(dbFile, { readOnly: true })
   try {
+    // expires_utc 是 1601 纪元的微秒 int64（超过 Number.MAX_SAFE_INTEGER，
+    // node:sqlite 裸读直接抛 ERR_OUT_OF_RANGE）——纪元换算放在 SQL 里做：
+    // int64 除法精确，结果秒值 ~4e8 在安全整数范围内
     const rows = db
-      .prepare('SELECT host_key, name, value, encrypted_value, path, is_secure, is_httponly, expires_utc, samesite FROM cookies')
+      .prepare(
+        'SELECT host_key, name, value, encrypted_value, path, is_secure, is_httponly, ' +
+          'CASE WHEN expires_utc > 0 THEN expires_utc / 1000000 - 11644473600 ELSE 0 END AS expires_sec, ' +
+          'samesite FROM cookies'
+      )
       .all()
     const cookies: BrowserCookieSeed[] = []
     let skipped = 0
@@ -321,7 +328,7 @@ async function readSourceCookies(root: string, staging: string): Promise<SourceC
           path: string
           is_secure: number
           is_httponly: number
-          expires_utc: number
+          expires_sec: number
           samesite: number | null
         }
         let value = r.value
@@ -340,7 +347,7 @@ async function readSourceCookies(root: string, staging: string): Promise<SourceC
           path: r.path || '/',
           secure: r.is_secure === 1,
           httpOnly: r.is_httponly === 1,
-          ...(r.expires_utc > 0 ? { expirationDate: r.expires_utc / 1_000_000 - 11_644_473_600 } : {}),
+          ...(r.expires_sec > 0 ? { expirationDate: r.expires_sec } : {}),
           ...(mapSameSite(r.samesite) ? { sameSite: mapSameSite(r.samesite) } : {})
         })
       } catch {