feat: added provision delegated fields

Author: juanmardefago

schema.graphql

@@ -890,6 +890,14 @@ type Provision @entity {
   indexingRewardsCut: BigInt!
 
   # Might want to add polymorphic handling of different fee cuts through a generic hashmap in the future
+
+  # Delegation
+  "Tokens delegated to the provision"
+  delegatedTokens: BigInt!
+  "Total shares of the delegator pool"
+  delegatorShares: BigInt!
+  "Exchange rate of of tokens received for each share"
+  delegationExchangeRate: BigDecimal!
 }
 
 enum PaymentTypes {

src/mappings/helpers/helpers.ts

@@ -209,6 +209,9 @@ export function createOrLoadProvision(indexerAddress: Bytes, verifierAddress: By
     provision.queryFeeCut = BigInt.fromI32(0)
     provision.indexingFeeCut = BigInt.fromI32(0)
     provision.indexingRewardsCut = BigInt.fromI32(0)
+    provision.delegatedTokens = BigInt.fromI32(0)
+    provision.delegatorShares = BigInt.fromI32(0)
+    provision.delegationExchangeRate = BigInt.fromI32(0).toBigDecimal()
     provision.save()
   }
 

src/mappings/horizonStaking.ts

@@ -273,9 +273,9 @@ export function handleThawRequestFulfilled(event: ThawRequestFulfilled): void {
 export function handleTokensToDelegationPoolAdded(event: TokensToDelegationPoolAdded): void {
     let indexer = Indexer.load(event.params.serviceProvider.toHexString())!
     let provision = createOrLoadProvision(event.params.serviceProvider, event.params.verifier, event.block.timestamp)
-    indexer.delegatedTokens = indexer.delegatedTokens.plus(event.params.tokens)
-    indexer = updateAdvancedIndexerMetricsHorizon(indexer, provision)
-    indexer = updateDelegationExchangeRate(indexer)
-    indexer = calculateCapacities(indexer)
+    provision.delegatedTokens = provision.delegatedTokens.plus(event.params.tokens)
+    provision.save()
+
+    indexer.delegatedTokens = indexer.delegatedTokens.plus(event.params.tokens) // this only serves as a general tracker, but the real deal is per provision
     indexer.save()
 }