Update ping.yml

Author: yashksaini-coder

.github/workflows/ping.yml

@@ -2,7 +2,7 @@ name: Keep Backend Active
 
 on:
   schedule:
-    - cron: '*/45 * * * *'  # Runs every 45 minutes
+    - cron: '*/15 * * * *'  # Runs every 15 minutes
   workflow_dispatch:
 
 jobs: