Extend loan to time series with state snapshot model

[sandford-ch]

Acceptance criteria

• @sandford-ch:
  • Based on best guess (w/o confirmation from Dennis) -> can still be extended, if required
  • https://docs.google.com/spreadsheets/d/1-lp1cYIy5B9Kpni3hLo2UqDD76aDxMimZW_6MbhqiQ4/edit#gid=1592342509
• extend loanEntity data types for time series data (i.e. loanSnapshots and loanStates)

[filo87]

Info for reconstructing outstanding debt:

https://github.com/centrifuge/centrifuge-chain/blob/parachain/pallets/loans/src/lib.rs#L192

https://github.com/centrifuge/centrifuge-chain/blob/parachain/pallets/loans/src/lib.rs#L203

https://github.com/centrifuge/centrifuge-chain/blob/parachain/pallets/loans/src/lib.rs#L212

In loans, you get per loan the normalized_debt. To get the total outstanding debt, you need to get accumulated_rate from https://github.com/centrifuge/centrifuge-chain/blob/parachain/pallets/interest-accrual/src/lib.rs#L155 for the interest rate of the loan, and outstanding debt = normalized_debt * accumulated_rate

[filo87]

Here only the

• indexing of outstandingDebt

is still pending