Reduce CloudSQL instance hours (wordpress)

I have a wordpress installation on GAE. It is a website that will be very sparsely updated, and will have few visitors each day (100 ish max). I would like to cache this website to minimize cloudSQL costs.

What Steps should I take to minimize the starting of my CloudSQL instances?

I have installed the MEMCACHED plugin and my BATCACHED Plugin.

my wp-config has the following:

$batcache = [
      'seconds'=>0,
      'max_age'=>300*60, // 300 minutes
      'debug'=>false
    ];

My app.yaml:

application: MY ID
version: 104
runtime: php
api_version: 1
default_expiration: "1d"

handlers:
- url: /(.*.(htm$|html$|css$|js$))
  static_files: wordpress/1
  upload: wordpress/.*.(htm$|html$|css$|js$)
  application_readable: true




- url: /wp-content/(.*.(ico$|jpg$|png$|gif$))
  static_files: wordpress/wp-content/1
  upload: wordpress/wp-content/.*.(ico$|jpg$|png$|gif$)
  application_readable: true




- url: /(.*.(ico$|jpg$|png$|gif$))
  static_files: wordpress/1
  upload: wordpress/.*.(ico$|jpg$|png$|gif$)  
  application_readable: true








- url: /wp-admin/(.+)
  script: wordpress/wp-admin/1
  secure: always

- url: /wp-admin/
  script: wordpress/wp-admin/index.php
  secure: always

- url: /wp-login.php
  script: wordpress/wp-login.php
  secure: always

- url: /wp-cron.php
  script: wordpress/wp-cron.php
  login: admin

- url: /xmlrpc.php
  script: wordpress/xmlrpc.php




- url: /(.*.(appcache|manifest))
  mime_type: text/cache-manifest
  static_files: wordpress/1
  upload: wordpress/(.*.(appcache|manifest))
  expiration: "0m"
  application_readable: true


- url: /(.*.atom)
  mime_type: application/atom+xml
  static_files: wordpress/1
  upload: wordpress/(.*.atom)
  expiration: "1h"
  application_readable: true



- url: /(.*.crx)
  mime_type: application/x-chrome-extension
  static_files: wordpress/1
  upload: wordpress/(.*.crx)
  application_readable: true



- url: /(.*.css)
  mime_type: text/css
  static_files: wordpress/1
  upload: wordpress/(.*.css)
  application_readable: true



- url: /(.*.eot)
  mime_type: application/vnd.ms-fontobject
  static_files: wordpress/1
  upload: wordpress/(.*.eot)
  application_readable: true



- url: /(.*.htc)
  mime_type: text/x-component
  static_files: wordpress/1
  upload: wordpress/(.*.htc)
  application_readable: true



- url: /(.*.html)
  mime_type: text/html
  static_files: wordpress/1
  upload: wordpress/(.*.html)
  expiration: "1h"
  application_readable: true



- url: /(.*.ico)
  mime_type: image/x-icon
  static_files: wordpress/1
  upload: wordpress/(.*.ico)
  expiration: "7d"
  application_readable: true



- url: /(.*.js)
  mime_type: text/javascript
  static_files: wordpress/1
  upload: wordpress/(.*.js)
  application_readable: true



- url: /(.*.json)
  mime_type: application/json
  static_files: wordpress/1
  upload: wordpress/(.*.json)
  expiration: "1h"
  application_readable: true



- url: /(.*.m4v)
  mime_type: video/m4v
  static_files: wordpress/1
  upload: wordpress/(.*.m4v)
  application_readable: true



- url: /(.*.mp4)
  mime_type: video/mp4
  static_files: wordpress/1
  upload: wordpress/(.*.mp4)
  application_readable: true



- url: /(.*.(ogg|oga))
  mime_type: audio/ogg
  static_files: wordpress/1
  upload: wordpress/(.*.(ogg|oga))
  application_readable: true



- url: /(.*.ogv)
  mime_type: video/ogg
  static_files: wordpress/1
  upload: wordpress/(.*.ogv)
  application_readable: true



- url: /(.*.otf)
  mime_type: font/opentype
  static_files: wordpress/1
  upload: wordpress/(.*.otf)
  application_readable: true



- url: /(.*.rss)
  mime_type: application/rss+xml
  static_files: wordpress/1
  upload: wordpress/(.*.rss)
  expiration: "1h"
  application_readable: true



- url: /(.*.safariextz)
  mime_type: application/octet-stream
  static_files: wordpress/1
  upload: wordpress/(.*.safariextz)
  application_readable: true



- url: /(.*.(svg|svgz))
  mime_type: images/svg+xml
  static_files: wordpress/1
  upload: wordpress/(.*.(svg|svgz))
  application_readable: true



- url: /(.*.swf)
  mime_type: application/x-shockwave-flash
  static_files: wordpress/1
  upload: wordpress/(.*.swf)
  application_readable: true



- url: /(.*.ttf)
  mime_type: font/truetype
  static_files: wordpress/1
  upload: wordpress/(.*.ttf)
  application_readable: true



- url: /(.*.txt)
  mime_type: text/plain
  static_files: wordpress/1
  upload: wordpress/(.*.txt)
  application_readable: true



- url: /(.*.unity3d)
  mime_type: application/vnd.unity
  static_files: wordpress/1
  upload: wordpress/(.*.unity3d)
  application_readable: true



- url: /(.*.webm)
  mime_type: video/webm
  static_files: wordpress/1
  upload: wordpress/(.*.webm)
  application_readable: true



- url: /(.*.webp)
  mime_type: image/webp
  static_files: wordpress/1
  upload: wordpress/(.*.webp)
  application_readable: true



- url: /(.*.woff)
  mime_type: application/x-font-woff
  static_files: wordpress/1
  upload: wordpress/(.*.woff)
  application_readable: true



- url: /(.*.xml)
  mime_type: application/xml
  static_files: wordpress/1
  upload: wordpress/(.*.xml)
  expiration: "1h"
  application_readable: true



- url: /(.*.xpi)
  mime_type: application/x-xpinstall
  static_files: wordpress/1
  upload: wordpress/(.*.xpi)
  application_readable: true



# audio files
- url: /(.*.(mid|midi|mp3|wav))
  static_files: wordpress/1
  upload: wordpress/(.*.(mid|midi|mp3|wav))  
  application_readable: true



# windows files
- url: /(.*.(doc|exe|ppt|rtf|xls))
  static_files: wordpress/1
  upload: wordpress/(.*.(doc|exe|ppt|rtf|xls))
  application_readable: true



# compressed files
- url: /(.*.(bz2|gz|rar|tar|tgz|zip))
  static_files: wordpress/1
  upload: wordpress/(.*.(bz2|gz|rar|tar|tgz|zip))  
  application_readable: true



- url: /wp-(.+).php
  script: wordpress/wp-1.php

- url: /(.+)?/?
  script: wordpress/index.php

I would like to know all the ways to reduce wordpress starting my CloudSQL instance. Also, I would like to know how to check if caching is correctly working or not.

currently, even when I visit a page without logging into wordpress, it shows a CloudSQL instance started(one active connection), which I believe should not be the case if caching is working properly