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Design the architecture for a system that {{description}}.
Constraints:
- Expected scale: {{scale}}
- Tech preferences: {{tech_stack}}
- Must-haves: {{must_haves}}
Provide:
1. Main components and what each does
2. Recommended technologies (with justification)
3. Data flow between components
4. Scalability considerations
5. Security considerations
6. Three biggest risks and how to mitigate them