Borrowing and Lending

On-chain:

• Added liquidation mechanism to account and pool contracts
• Fixed pool contract list data types to reduce ExUnit cost from tryFromData function
• Fixed check validity range function on-chain to circumvent cardano-api restriction of upper bound being open
• Allowed users to cancel pending requests which haven’t been applied to jPool contract. Changed logic of updating pending requests in account contract for less calculation.
• Added logic of burning account auth token when closing an account.
• Refactored more places using plet instead of let to optimize on-chain code.
• Changed oracle’s updating price method from using master key to using NFT
• Added logic for pool contract to skip checking loan-to-value requirement for deposit and repay only requests
• Add migration for Pool and Account contracts
• Implemented batcher fee constraints for deposit, repay, and set collateral

Off-chain & tests:

• Added unit tests for liquidation on-chain code
• Added repay, borrow, set collateral, close account in api
• Separated dist-newstyle cache for different PR builds
• Extracted max duration between lower and upper bound of validity range from latest datum of manager contract instead of hard code while building batching transaction.
• Integration tests for update account indexer, borrow, repay, set collateral, close account
• Integration tests for batching transaction.
• Improved better logging for integration tests.
• Enforced max number of collateral inputs in transaction building by querying Cardano protocol params
• Retried querying DB on failure in integration tests to avoid flaky tests
• Updated faucet config with more types of tokens and more readable token name
• Checked error message for some failed scenarios in unit tests

Infrastructure:

• Scanned all active AWS accounts using prowler software for security best practices
• Maintenance on Cardano stake relay instance on old MELD stack
• Maintenance on Cardano stake producing instance on old MELD stack
• Cleaning out old unused ec2 instances

Read more from the Dev Diary series here!