fix: set initial values for non nullable fields

Signed-off-by: Tomás Migone <tomas@edgeandnode.com>

src/mappings/helpers/helpers.ts

@@ -429,6 +429,8 @@ export function createEpoch(startBlock: i32, epochLength: i32, epochNumber: i32)
   epoch.totalRewards = BigInt.fromI32(0)
   epoch.totalIndexerRewards = BigInt.fromI32(0)
   epoch.totalDelegatorRewards = BigInt.fromI32(0)
+  epoch.totalQueryFees = BigInt.fromI32(0)
+  epoch.taxedQueryFees = BigInt.fromI32(0)
   epoch.save()
   return epoch
 }
@@ -520,6 +522,7 @@ export function createOrLoadGraphNetwork(
     graphNetwork.epochLength = 0
     graphNetwork.lastRunEpoch = 0
     graphNetwork.lastLengthUpdateEpoch = 0
+    graphNetwork.lastLengthUpdateBlock = 0
     if (addresses.isL1) {
       graphNetwork.lastLengthUpdateBlock = blockNumber.toI32() // Use chain native block
     } else {
@@ -552,6 +555,11 @@ export function createOrLoadGraphNetwork(
     graphNetwork.minimumDisputeDeposit = BigInt.fromI32(0)
     graphNetwork.fishermanRewardPercentage = 0
 
+    graphNetwork.totalGRTDeposited = BigInt.fromI32(0)
+    graphNetwork.totalGRTDepositedConfirmed = BigInt.fromI32(0)
+    graphNetwork.totalGRTWithdrawn = BigInt.fromI32(0)
+    graphNetwork.totalGRTWithdrawnConfirmed = BigInt.fromI32(0)
+
     graphNetwork.save()
   }
   if (!addresses.isL1) {