fix: skip auto-backup when data unchanged (sha256 hash comparison)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/server_store.py

@@ -4,6 +4,7 @@ Supports encryption, backups, and configurable config path.
 Thread-safe with atomic writes.
 """
 
+import hashlib
 import json
 import os
 import shutil
@@ -49,6 +50,7 @@ class ServerStore:
         self._statuses_lock = threading.Lock()
         self._file_lock = threading.Lock()
         self._last_backup_time: float = 0
+        self._last_backup_hash: str = ""
         self._terminal_font_size: int = 11
         self._servers_file: str = DEFAULT_SERVERS_FILE
         self._load_settings()
@@ -192,9 +194,18 @@ class ServerStore:
         if now - self._last_backup_time >= _BACKUP_INTERVAL:
             self._auto_backup()
 
+    def _data_hash(self) -> str:
+        text = json.dumps(self._data, sort_keys=True, ensure_ascii=False)
+        return hashlib.sha256(text.encode("utf-8")).hexdigest()
+
     def _auto_backup(self):
+        current_hash = self._data_hash()
+        if current_hash == self._last_backup_hash:
+            self._last_backup_time = time.time()
+            return
         try:
             self.create_backup()
+            self._last_backup_hash = current_hash
         except Exception as e:
             log.warning(f"Auto-backup failed: {e}")
 
@@ -207,6 +218,7 @@ class ServerStore:
         dst = os.path.join(BACKUP_DIR, name)
         shutil.copy2(self._servers_file, dst)
         self._last_backup_time = time.time()
+        self._last_backup_hash = self._data_hash()
         log.info(f"Backup created: {name}")
         return name