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Design an indexer: async tokio runtime, typed RPC client with serde, a channel between fetcher and writer tasks, Arc-shared config, typed errors with thiserror, retries with backoff, and property tests over reorg handling. This exercises ownership, concurrency, error design and the crate ecosystem at once.
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50. Capstone: A Rust Chain Service
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1. Which runtime pattern suits an I/O-bound indexer?
2. Shared immutable config across tasks is best held in…
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