create an expression evaluation component ( roi per user / per symbol on a daily basis)

[athanikos]

there will be two components

1. calculations Balance per user per date Symbol Price per date

examples of produced variables from above : Profit(user, date) can be calculated as : balance(user, date) - total value from transactions (user,date) Profit(user, symbol, date) : balance(user, date) - total value from transactions (user,date) Symbol price change (symbol,curr date, past date) = symbol price (curr date) - symbol(past date)

2. evaluations A > B * .10