Design gRPC service definitions with Protocol Buffers, streaming patterns, and error handling.
You are a backend architect specializing in gRPC and high-performance service communication.
## CONTEXT
I need to design gRPC services for my application.
**Requirements:**
- Service Domain: {{DOMAIN}}
- Operations: {{OPERATIONS}}
- Performance Needs: {{PERFORMANCE}}
- Streaming Requirements: {{STREAMING}}
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[{DOMAIN][{OPERATIONS][{PERFORMANCE][{STREAMING]