feat: add NAV values to epoch object

schema.graphql

@@ -251,6 +251,12 @@ type Epoch @entity {
   closedAt: Date
   executedAt: Date
 
+  # NAV == totalReserve + offchainCashValue + portfolioValuation - sumPoolFeesPendingAmount
+  netAssetValue: BigInt # previously: portfolioValuation
+  totalReserve: BigInt
+  offchainCashValue: BigInt # previously: cashAssetValue
+  portfolioValuation: BigInt
+
   # Aggregated data during this epoch
   sumBorrowedAmount: BigInt
   sumRepaidAmount: BigInt

src/mappings/handlers/poolsHandlers.ts

@@ -160,7 +160,13 @@ async function _handleEpochClosed(event: SubstrateEvent<EpochClosedExecutedEvent
   const tranches = await TrancheService.getActivesByPoolId(poolId.toString())
   const epoch = await EpochService.getById(poolId.toString(), epochId.toNumber())
   if (!epoch) throw new Error(`Epoch ${epochId.toString(10)} not found for pool ${poolId.toString(10)}`)
-  await epoch.closeEpoch(timestamp)
+  await epoch.closeEpoch(
+    timestamp,
+    pool.netAssetValue,
+    pool.totalReserve,
+    pool.offchainCashValue,
+    pool.portfolioValuation
+  )
   await epoch.saveWithStates()
 
   const trancheIds = tranches.map((tranche) => tranche.trancheId)

src/mappings/services/epochService.ts

@@ -28,6 +28,11 @@ export class EpochService extends Epoch {
     epoch.sumRedeemedAmount = BigInt(0)
     epoch.sumPoolFeesPaidAmount = BigInt(0)
 
+    epoch.netAssetValue = BigInt(0)
+    epoch.totalReserve = BigInt(0)
+    epoch.offchainCashValue = BigInt(0)
+    epoch.portfolioValuation = BigInt(0)
+
     epoch.states = trancheIds.map((trancheId) => {
       const epochState = new EpochState(`${poolId}-${epochNr}-${trancheId}`, epoch.id, trancheId)
       epochState.sumOutstandingInvestOrders = BigInt(0)
@@ -59,9 +64,20 @@ export class EpochService extends Epoch {
     return [...this.states]
   }
 
-  public closeEpoch(timestamp: Date) {
+  public closeEpoch(
+    timestamp: Date,
+    netAssetValue: bigint | undefined,
+    totalReserve: bigint | undefined,
+    offchainCashValue: bigint | undefined,
+    portfolioValuation: bigint | undefined
+  ) {
     logger.info(`Closing epoch ${this.id} on ${timestamp}`)
     this.closedAt = timestamp
+
+    this.netAssetValue = netAssetValue
+    this.totalReserve = totalReserve
+    this.offchainCashValue = offchainCashValue
+    this.portfolioValuation = portfolioValuation
   }
 
   public async executeEpoch(timestamp: Date) {