Track liquidations of users in the lending protocol

[nud3l]

Required data-points:

• Repaid debt amount and token
• Seized collateral amount and token
• Cost of liquidation amount and token
• Timestamp
• Transaction id (extrinsic)

The USD amounts are not going to be stored in squid, so can be ignored.

Designs:

Blocker for https://github.com/interlay/interbtc-ui/issues/869

[jtfirek]

Am I on the right track here @daniel-savu ? This is the event I need to track:

        LiquidatedBorrow {
            liquidator: T::AccountId,
            borrower: T::AccountId,
            liquidation_currency_id: CurrencyId<T>,
            collateral_currency_id: CurrencyId<T>,
            repay_amount: BalanceOf<T>,
            collateral_underlying_amount: BalanceOf<T>,
        },

repay_amount corresponds to: Repaid debt amount and token

collateral_underlying_amount corresponds to: Seized collateral amount and token

Do you have any thoughts on how I can get cost of liquidation and Transaction id?

[daniel-savu]

cost of liquidation

See this Discord discussion here and here. TLDR: collateral_underlying_amount - repay_amount

Transaction id

Good question, maybe there's a way to read that from the squid metadata of the event. You can check if the transaction id is used elsewhere in squid or the UI, or maybe ask Brendon.

[nud3l]

The event should have a filed "extrinsic" with an id. That is the transaction id.

[jtfirek]

@daniel-savu @nud3l What currencies should I account for these values?

liquidation_currency_id: CurrencyId<T>,
collateral_currency_id: CurrencyId<T>,

What token would you to see cost of liquidation represented as since it seems like I will be calculating this from collateral_underlying_amount and repay_amount?

[daniel-savu]

What token would you to see cost of liquidation represented as

The UI should display the cost of liquidation both in USD and the collateral_currency_id