April 2026: Delivered the Subscription Userinfo Header Proxy feature for kenzok8/sublink-worker. The feature proxies the upstream subscription-userinfo header, stores and retrieves per-user subscription data via BaseConfigBuilder, and includes this data in the createApp response headers. This enables downstream services to access per-user subscription context, improving integration with subscription providers and reducing bespoke integration work. No explicit bugs fixed were reported for this repo in April 2026. Overall, the work strengthens data consistency, reduces integration friction, and adds a foundation for policy-driven customization. Technologies demonstrated include header proxying, upstream header handling, BaseConfigBuilder integration, API response header augmentation, and end-to-end traceability through commit 7ee960e734fe68f6efae5f790e04052b53108646.