Real-Time Batching in Go

Imagine updating a user's last_active_at timestamp on every HTTP request – thousands of tiny UPDATEs per second, perfect for batching, except each call only sees one user ID at a time. Here's a transparent batching pattern built on ReplyTo channels, where callers still make a simple blocking function call that respects context and returns errors, while the database sees clean batches. (Tags: #go…