Goal: make insert/deletes more performant

• Remove unused indexes -- each insert was updating all indexes
• Add chain+blockNumber to the uniqueness constraint to trade off better pruning of the search space for more disk space used

PR-Codex overview

This PR focuses on updating the primary keys and indexes for the contract_event_logs and contract_transaction_receipts models in the Prisma schema, enhancing the database structure for better performance and data integrity.

Detailed summary

• Updated primary key for contract_event_logs to include chainId, blockNumber, transactionHash, and logIndex.
• Updated primary key for contract_transaction_receipts to include chainId, blockNumber, and transactionHash.
• Modified indexes for both models to include chainId and contractAddress.
• Added SQL migration commands to drop old indexes and create new ones reflecting the schema changes.

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