The blog post discusses updates in version 7.1 related to hierarchical JavaScript library storage for executing SQL++ queries within Couchbase, emphasizing the transition from flat to hierarchical storage structures. This change allows the creation of libraries under specific buckets and scopes, offering more flexibility in managing and deploying code. It explains how global libraries can function as an extension of applications across different buckets and scopes, while scope libraries are confined to their respective scopes. The post also details how to manipulate these libraries using the jsevaluator REST endpoint, highlighting the need for appropriate user privileges and careful handling to prevent unintentional impacts on user-defined functions. Additionally, it provides tips on using the curl command to amend libraries, stressing the necessity of resubmitting the entire library when making changes. The post concludes by explaining that SQL++ serves as an extension of SQL for querying JSON documents, aligning with the series' overarching theme of integrating SQL++ with JavaScript functionality.