Keep track of all transactions in the graph

[lucasvo]

We currently only track ERC20 token transfers but we want to track all types transactions we have in our pool and be able to show a history of a user's past transactions. We should add an entity to the subgraph schema allowing us to track all possible transaction types with the following fields:

• Timestamp
• EthTxHash
• Type: supplyOrder, redeemOrder, supply, redeem, disburseRedeem, disburseSupply, send, receive
• Token: tokenAddress
• Junior/Senior
• Pool: poolId
• Amount:
  • Denominated in DROP/TIN for redemptions, disburseSupply, send,receive
  • Denominated in DAI for supply, disburseRedeem
• PendingSupplyOrder: pending amount in DAI if the user still has a pending order that is partially fulfilled
• PendingRedeemOrder: pending amount in DROP/TIN if the user still has a pending order that is partially fulfilled
• Token Price at the time of the transaction