**Architecture Diagram**:
[Config/DB] -> [DAG Factory]
| |
v v
[Client List] create_dag(client_id)
| |
+---------> [DAG: process_client_X]
|
v
[Extract] -> [Transform]
| |
+--------->
Loop over clients: for client in get_clients(): globals()[f'process_{client}'] = create_client_dag(client)....
The complete answer continues with detailed implementation patterns, architectural trade-offs, and production-grade considerations. It covers performance optimization strategies, common pitfalls to avoid, and real-world examples from companies like Dunnhumby. The answer also includes follow-up discussion points that interviewers commonly explore.
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