A Globally Unique Identifier (GUID) Generation System is a service that produces unique identifiers at scale for use across distributed systems. Its purpose is to generate IDs that never collide (no duplicates) even when issued from multiple data centers or services concurrently. These IDs can serve as database primary keys, event/message IDs, object handles, or any context where a distinct identifier is needed for each entity. The system supports two ID formats: opaque IDs and ordered IDs