perf: reduce store.get calls and mark TokenIdCondition immutable

schema.graphql

@@ -12,7 +12,7 @@ type NetUserBalance @entity {
   balance: BigInt! # balance
 }
 
-type TokenIdCondition @entity {
+type TokenIdCondition @entity(immutable: true) {
   id: String! # tokenId
   condition: Condition! # conditionId
   complement: String! # complementary tokenId

src/ctf.ts

@@ -58,12 +58,6 @@ export function handleConditionPreparation(event: ConditionPreparation): void {
 
   entityOne.save();
   entityTwo.save();
-
-  // log.info(`registered entities with condition {} and positionIds {} and {}`, [
-  //   conditionId.toHexString(),
-  //   positions[0].toString(),
-  //   positions[1].toString(),
-  // ]);
 }
 
 export function handleConditionResolution(event: ConditionResolution): void {
@@ -87,33 +81,37 @@ export function handleConditionResolution(event: ConditionResolution): void {
   condition.save();
 }
 
+// Accepts the already-loaded UserBalance for the current token to avoid
+// redundant store.get calls. Only loads the complement balance.
 function _setNetPosition(
   user: Address,
   condition: string,
-  tokenOne: string,
-  tokenTwo: string
+  currentTokenId: string,
+  complementTokenId: string,
+  currentTokenBalance: UserBalance | null
 ): void {
   let positiveBalanceAsset: string;
   let positiveBalanceAmount: BigInt;
-  let tokenOneBalance = UserBalance.load(user.toHexString() + "-" + tokenOne);
-  let tokenTwoBalance = UserBalance.load(user.toHexString() + "-" + tokenTwo);
-
-  if (tokenOneBalance == null) {
-    positiveBalanceAsset = tokenTwo;
-    positiveBalanceAmount = tokenTwoBalance!.balance;
-  } else if (tokenTwoBalance == null) {
-    positiveBalanceAsset = tokenOne;
-    positiveBalanceAmount = tokenOneBalance!.balance;
+  let complementBalance = UserBalance.load(
+    user.toHexString() + "-" + complementTokenId
+  );
+
+  if (currentTokenBalance == null) {
+    positiveBalanceAsset = complementTokenId;
+    positiveBalanceAmount = complementBalance!.balance;
+  } else if (complementBalance == null) {
+    positiveBalanceAsset = currentTokenId;
+    positiveBalanceAmount = currentTokenBalance!.balance;
   } else {
-    if (tokenOneBalance!.balance > tokenTwoBalance!.balance) {
-      positiveBalanceAsset = tokenOne;
-      positiveBalanceAmount = tokenOneBalance!.balance.minus(
-        tokenTwoBalance!.balance
+    if (currentTokenBalance!.balance > complementBalance!.balance) {
+      positiveBalanceAsset = currentTokenId;
+      positiveBalanceAmount = currentTokenBalance!.balance.minus(
+        complementBalance!.balance
       );
     } else {
-      positiveBalanceAsset = tokenTwo;
-      positiveBalanceAmount = tokenTwoBalance!.balance.minus(
-        tokenOneBalance!.balance
+      positiveBalanceAsset = complementTokenId;
+      positiveBalanceAmount = complementBalance!.balance.minus(
+        currentTokenBalance!.balance
       );
     }
   }
@@ -154,7 +152,8 @@ function _adjustSenderBalance(
       sender,
       tokenCondition.condition,
       tokenCondition.id,
-      tokenCondition.complement
+      tokenCondition.complement,
+      senderBalance
     );
   }
 }
@@ -188,7 +187,8 @@ function _adjustReceiverBalance(
       receiver,
       tokenCondition.condition,
       tokenCondition.id,
-      tokenCondition.complement
+      tokenCondition.complement,
+      receiverBalance
     );
   }
 }