hardcoded settings & trigger canvas cache upon undoing pixels

packages/server/src/lib/Canvas.ts

@@ -26,7 +26,7 @@ class Canvas {
       frozen: this.isFrozen,
       zoom: 7,
       pixel: {
-        cooldown: 10,
+        cooldown: 30,
         multiplier: 3,
         maxStack: 6,
       },
@@ -326,6 +326,8 @@ class Canvas {
       pixels.map((pixel) => this.undoPixel(pixel))
     );
 
+    await this.canvasToRedis();
+
     Logger.info(
       "Finished undo area in " + ((Date.now() - now) / 1000).toFixed(2) + "s"
     );