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db.py

@@ -15,16 +15,23 @@ BACKUP_DIR = DB_PATH.parent / 'backups'
 
 
 def backup_db():
-    """異動前自動備份 DB"""
+    """異動前自動備份 DB。當天最多留 5 個，總共最多 15 個。"""
     if not DB_PATH.exists():
         return
     BACKUP_DIR.mkdir(exist_ok=True)
+    today = datetime.now().strftime('%Y%m%d')
     ts = datetime.now().strftime('%Y%m%d_%H%M%S')
     dst = BACKUP_DIR / f'pra_data_{ts}.db'
     shutil.copy2(str(DB_PATH), str(dst))
-    # 只保留最近 30 個備份
-    backups = sorted(BACKUP_DIR.glob('pra_data_*.db'))
-    for old in backups[:-30]:
+
+    # 當天只留最近 5 個
+    today_backups = sorted(BACKUP_DIR.glob(f'pra_data_{today}_*.db'))
+    for old in today_backups[:-5]:
+        old.unlink()
+
+    # 總共最多 15 個
+    all_backups = sorted(BACKUP_DIR.glob('pra_data_*.db'))
+    for old in all_backups[:-15]:
         old.unlink()