perf: optimize allocation rules evaluation from O(n²) to O(n)

Replace repeated Array.filter() + Array.find() with Map-based lookup for deployment rules.

- Add preprocessRules() function to create Map for O(1) rule lookups
- Update isDeploymentWorthAllocatingTowards() to use pre-processed rules Map
- Update evaluateDeployments() to preprocess rules once instead of per deployment
- Update AllocationManager.matchingRuleExists() to use optimized lookup

Performance improvement:
- Before: O(n²) - filter + find for each deployment evaluation
- After: O(n) - single preprocessing + O(1) lookups per deployment
- Significant speedup when evaluating many deployments against many rules

Fixes performance bottleneck in allocation rule evaluation where processing
thousands of deployments with hundreds of rules resulted in quadratic complexity.

Author: madumas

packages/indexer-common/src/indexer-management/allocations.ts

@@ -47,6 +47,7 @@ import {
   encodeCollectIndexingRewardsData,
   encodePOIMetadata,
 } from '@graphprotocol/toolshed'
+import { preprocessRules } from '../subgraphs'
 
 import {
   BigNumberish,
@@ -1791,8 +1792,15 @@ export class AllocationManager {
         `SHOULD BE UNREACHABLE: No matching subgraphDeployment (${subgraphDeploymentID.ipfsHash}) found on the network`,
       )
     }
-    return isDeploymentWorthAllocatingTowards(logger, subgraphDeployment, indexingRules)
-      .toAllocate
+    const { deploymentRulesMap, globalRule } = preprocessRules(indexingRules)
+
+    return isDeploymentWorthAllocatingTowards(
+      logger,
+      subgraphDeployment,
+      indexingRules,
+      deploymentRulesMap,
+      globalRule,
+    ).toAllocate
   }
 
   // Calculates the balance (GRT delta) of a single Action.

packages/indexer-common/src/subgraphs.ts

@@ -187,29 +187,60 @@ export class AllocationDecision {
   }
 }
 
+export interface PreprocessedRules {
+  deploymentRulesMap: { [key: string]: IndexingRuleAttributes }
+  globalRule: IndexingRuleAttributes | undefined
+}
+
+export function preprocessRules(rules: IndexingRuleAttributes[]): PreprocessedRules {
+  let globalRule: IndexingRuleAttributes | undefined
+  const deploymentRulesMap: { [key: string]: IndexingRuleAttributes } = {}
+
+  for (let i = 0; i < rules.length; i++) {
+    const rule = rules[i]
+    if (rule.identifier === INDEXING_RULE_GLOBAL) {
+      globalRule = rule
+    } else if (rule.identifierType === SubgraphIdentifierType.DEPLOYMENT) {
+      deploymentRulesMap[rule.identifier] = rule
+    }
+  }
+
+  return { deploymentRulesMap, globalRule }
+}
+
 export function evaluateDeployments(
   logger: Logger,
   networkDeployments: SubgraphDeployment[],
   rules: IndexingRuleAttributes[],
 ): AllocationDecision[] {
-  return networkDeployments.map((deployment) =>
-    isDeploymentWorthAllocatingTowards(logger, deployment, rules),
-  )
+  const { deploymentRulesMap, globalRule } = preprocessRules(rules)
+  const results: AllocationDecision[] = []
+
+  for (let i = 0; i < networkDeployments.length; i++) {
+    const deployment = networkDeployments[i]
+    results.push(
+      isDeploymentWorthAllocatingTowards(
+        logger,
+        deployment,
+        rules,
+        deploymentRulesMap,
+        globalRule,
+      ),
+    )
+  }
+
+  return results
 }
 
 export function isDeploymentWorthAllocatingTowards(
   logger: Logger,
   deployment: SubgraphDeployment,
   rules: IndexingRuleAttributes[],
+  deploymentRulesMap: { [key: string]: IndexingRuleAttributes },
+  globalRule: IndexingRuleAttributes | undefined,
 ): AllocationDecision {
-  const globalRule = rules.find((rule) => rule.identifier === INDEXING_RULE_GLOBAL)
-  const deploymentRule =
-    rules
-      .filter((rule) => rule.identifierType == SubgraphIdentifierType.DEPLOYMENT)
-      .find(
-        (rule) =>
-          new SubgraphDeploymentID(rule.identifier).bytes32 === deployment.id.bytes32,
-      ) || globalRule
+  // Use the pre-processed object for O(1) lookup
+  const deploymentRule = deploymentRulesMap[deployment.id.ipfsHash] || globalRule
 
   logger.trace('Evaluating whether subgraphDeployment is worth allocating towards', {
     deployment,