implemented Account.tokensDelegatedFrom

schema.graphql

@@ -231,8 +231,10 @@ type Account @entity {
   rewardsClaimed: BigDecimal!
   # voting state for each distribution period
   distributionPeriodVotes: [DistributionPeriodVote!]!
-  # amount of tokens delegated to this account
-  tokensDelegated: BigDecimal!
+  # amount of tokens delegated by this user to a single delegated voter
+  tokensDelegatedFrom: BigDecimal!
+  # cumulative amount of tokens delegated from multiple users to this voter
+  tokensDelegatedTo: BigDecimal!
 
   # positions associated with the account
   positions: [Position!]!
@@ -961,6 +963,7 @@ type DelegateChanged @entity(immutable: true) {
 
 type DelegateVotesChanged @entity(immutable: true) {
   id: Bytes!
+  delegator: Bytes! # address
   delegate: Bytes! # address
   previousBalance: BigDecimal! # uint256
   newBalance: BigDecimal! # uint256

src/mappings/ajna-token.ts

@@ -53,6 +53,7 @@ export function handleDelegateVotesChanged(
   let entity = new DelegateVotesChanged(
     event.transaction.hash.concatI32(event.logIndex.toI32())
   )
+  entity.delegator = event.transaction.from
   entity.delegate = event.params.delegate
   entity.previousBalance = wadToDecimal(event.params.previousBalance)
   entity.newBalance = wadToDecimal(event.params.newBalance)
@@ -62,10 +63,14 @@ export function handleDelegateVotesChanged(
   entity.blockTimestamp = event.block.timestamp
   entity.transactionHash = event.transaction.hash
 
+  const delegator = loadOrCreateAccount(entity.delegator)
+  delegator.tokensDelegatedFrom = entity.newBalance
+
   const delegateId = addressToBytes(event.params.delegate)
   const delegate = loadOrCreateAccount(delegateId)
-  delegate.tokensDelegated = delegate.tokensDelegated.plus(changeInBalance)
+  delegate.tokensDelegatedTo = delegate.tokensDelegatedTo.plus(changeInBalance)
 
+  delegator.save()
   delegate.save()
   entity.save()
 }

src/utils/account.ts

@@ -24,7 +24,8 @@ export function loadOrCreateAccount(accountId: Bytes): Account {
       account.delegatedFrom           = []
       account.rewardsClaimed          = ZERO_BD
       account.distributionPeriodVotes = []
-      account.tokensDelegated         = ZERO_BD
+      account.tokensDelegatedFrom     = ZERO_BD
+      account.tokensDelegatedTo       = ZERO_BD
 
       account.txCount = ZERO_BI
     }