update build

build.bat

@@ -1,5 +1,15 @@
 del cyzg.zip
 7z a -tzip -mx=9 cyzg.zip main.py backend.py components/ -x!components/__pycache__/
-REM 7z a -tzip -mx=9 data.db.zip data.db
+
+if /i "%~1"=="db" (
+    echo 正在压缩 data.db...
+    7z a -tzip -mx=9 data.db.zip data.db
+) else (
+    echo use data.db.zip cash.
+    echo run `./build.bat db` to refresh cash
+)
 python embed.py
+
 gcc -Os -s main.c -o cyzg.exe -Wl,--gc-sections -Wl,--strip-all
+
+echo done