Move status validation from post-retrieval checks into Prisma WHERE clauses. This prevents TOCTOU issues and ensures only ACTIVE connections are retrieved. Removed redundant status checks after retrieval in both query and command services. Security improvement: Enforces status=ACTIVE in database query rather than checking after retrieval, preventing race conditions. Fixes #283 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>