During February 2026, Dat H. focused on backend reliability for the ofkm/arcane repository, addressing authentication failures in the Edge Tunnel Proxy. He resolved persistent 401 errors by injecting agent token headers into proxy requests, a targeted fix that improved session continuity for edge tunnel clients. Working primarily in Go, Dat applied his skills in API integration and middleware design to ensure reliable token propagation, thereby strengthening the authentication flow. This change reduced support incidents and improved observability of authentication behavior, reflecting a thoughtful approach to backend stability. The work demonstrated depth in diagnosing and remediating complex proxy authentication issues.