Member Content: Improve Performance in Admin UI

[n7studios]

Summary

The Plugin may display an admin notice in the WordPress dashboard when:

• Member Content is enabled on a Page, Post, or Custom Post Type, and
• a third-party caching plugin requires manual configuration to ensure proper functionality.

Previously, the query used to check whether Member Content was enabled ran on every admin request, making it inefficient for sites with a large number of posts (for example, this reported case with 450,000 pages).

This PR improves performance by:

• Optimizing the SQL query, resulting in approximately 60% faster execution, using a raw SQL query in favour of WP_Query, which resulted in unnecessary joins
• Running the query only when a Page, Post, or Custom Post Type is created, updated, or deleted, and caching the result for reuse (vs. the current behaviour of running this on every admin UI request)

Before:

After:

Testing

• Renamed RestrictContentIPInRangeTest to RestrictContentTest
• Added integration tests to RestrictContentTest to confirm cached result is correctly set depending on existence of Member Content
• Existing integration tests with caching plugins will pass, confirming admin notices correctly display, which now use this cached result

Checklist

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

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