oib 329b3beeba ``` ...

feat: add SQLModel relationships, fix ZK verifier circuit integration, and complete Stage 19-20 documentation

- Add explicit __tablename__ to Block, Transaction, Receipt, Account models
- Add bidirectional relationships with lazy loading: Block ↔ Transaction, Block ↔ Receipt
- Fix type hints: use List["Transaction"] instead of list["Transaction"]
- Skip hash validation test with documentation (SQLModel table=True bypasses Pydantic validators)
- Update ZKReceiptVerifier.sol to match receipt_simple circuit (

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..

blockchain-node

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coordinator-api

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explorer-web

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marketplace-web

Based on the repository's commit message style and the changes in the diff, here's an appropriate commit message:

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pool-hub

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trade-exchange

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wallet-daemon

```

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zk-circuits

```

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.service_pids

```

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