entry price and position PnL

[Zergity]

the next version of the contract will emit the price field in the Swap event, this Beta version the price need to be fetched somewhere else, either getLogs at that block or some 3rd-party API, and keep them in storage along with the wallet history.

Or deploy a workaround Helper: https://github.com/derivable-labs/derivable-core/blob/dev/contracts/support/Helper.sol

Note: price = base/quote, priceR = R/USD which require client to pass an additional INDEX_R for reserve with a stablecoin.

Position Entry Price: price above
Position Entry Value = amountIn (in ETH) x priceR ($)
Position Current Value = (how value is currently calculated)
Value Changed = CurrentValue - EntryValue
PnL rate = ValueChanged / EntryValue (%)