fix(usage): preserve pricing overrides and legacy merges

src/web-server/model-pricing.ts

@@ -858,6 +858,30 @@ function getCcsStaticPricing(model: string): ModelPricing | undefined {
   return undefined;
 }
 
+function getCcsPolicyOverridePricing(model: string): ModelPricing | undefined {
+  const providerlessModel = stripProviderPrefix(model);
+  const normalized = normalizeModelName(providerlessModel);
+
+  for (const candidate of getLookupCandidates(providerlessModel)) {
+    const alias = MODEL_PRICING_ALIASES[candidate];
+    if (alias !== undefined) {
+      const aliasPricing = NORMALIZED_PRICING_REGISTRY[alias];
+      if (aliasPricing !== undefined) {
+        return aliasPricing;
+      }
+    }
+
+    if (candidate !== normalized) {
+      const variantPricing = NORMALIZED_PRICING_REGISTRY[candidate];
+      if (variantPricing !== undefined) {
+        return variantPricing;
+      }
+    }
+  }
+
+  return undefined;
+}
+
 function hasProviderContext(model: string, options: PricingLookupOptions): boolean {
   return Boolean(options.provider || /^[^/]+\//.test(model.trim()));
 }
@@ -869,6 +893,11 @@ function hasProviderContext(model: string, options: PricingLookupOptions): boole
  */
 export function getModelPricing(model: string, options: PricingLookupOptions = {}): ModelPricing {
   if (hasProviderContext(model, options)) {
+    const ccsOverridePricing = getCcsPolicyOverridePricing(model);
+    if (ccsOverridePricing !== undefined) {
+      return ccsOverridePricing;
+    }
+
     const providerPricing = resolveModelsDevPricing(model, options);
     if (providerPricing !== undefined) {
       return providerPricing.pricing;

src/web-server/usage/aggregator.ts

@@ -35,7 +35,11 @@ import {
 import { scanCodexNativeUsageEntries } from './codex-native-usage-collector';
 import { scanDroidNativeUsageEntries } from './droid-native-usage-collector';
 import { startModelsDevRegistryRefresh } from '../models-dev/registry-cache';
-import { getModelsUsed, getProviderModelKey } from './model-identity';
+import {
+  coalesceLegacyProviderlessBreakdowns,
+  getModelsUsed,
+  getProviderModelKey,
+} from './model-identity';
 
 // ============================================================================
 // Multi-Instance Support - Aggregate usage from CCS profiles
@@ -113,6 +117,33 @@ function getHourlyRequestCount(hour: HourlyUsage): number {
   return hour.requestCount ?? hour.modelBreakdowns.length;
 }
 
+function finalizeDailyUsage(day: DailyUsage): DailyUsage {
+  const modelBreakdowns = coalesceLegacyProviderlessBreakdowns(day.modelBreakdowns);
+  return {
+    ...day,
+    modelsUsed: getModelsUsed(modelBreakdowns),
+    modelBreakdowns,
+  };
+}
+
+function finalizeMonthlyUsage(month: MonthlyUsage): MonthlyUsage {
+  const modelBreakdowns = coalesceLegacyProviderlessBreakdowns(month.modelBreakdowns);
+  return {
+    ...month,
+    modelsUsed: getModelsUsed(modelBreakdowns),
+    modelBreakdowns,
+  };
+}
+
+function finalizeHourlyUsage(hour: HourlyUsage): HourlyUsage {
+  const modelBreakdowns = coalesceLegacyProviderlessBreakdowns(hour.modelBreakdowns);
+  return {
+    ...hour,
+    modelsUsed: getModelsUsed(modelBreakdowns),
+    modelBreakdowns,
+  };
+}
+
 /**
  * Merge daily usage data from multiple sources
  * Combines entries with same date by aggregating tokens
@@ -146,7 +177,6 @@ export function mergeDailyData(sources: DailyUsage[][]): DailyUsage[] {
             existing.modelBreakdowns.push({ ...breakdown });
           }
         }
-        existing.modelsUsed = getModelsUsed(existing.modelBreakdowns);
       } else {
         // Clone to avoid mutating original
         const modelBreakdowns = day.modelBreakdowns.map((b) => ({ ...b }));
@@ -159,7 +189,9 @@ export function mergeDailyData(sources: DailyUsage[][]): DailyUsage[] {
     }
   }
 
-  return Array.from(dateMap.values()).sort((a, b) => a.date.localeCompare(b.date));
+  return Array.from(dateMap.values())
+    .map(finalizeDailyUsage)
+    .sort((a, b) => a.date.localeCompare(b.date));
 }
 
 /**
@@ -192,7 +224,6 @@ export function mergeMonthlyData(sources: MonthlyUsage[][]): MonthlyUsage[] {
             existing.modelBreakdowns.push({ ...breakdown });
           }
         }
-        existing.modelsUsed = getModelsUsed(existing.modelBreakdowns);
       } else {
         const modelBreakdowns = month.modelBreakdowns.map((breakdown) => ({ ...breakdown }));
         monthMap.set(month.month, {
@@ -204,7 +235,9 @@ export function mergeMonthlyData(sources: MonthlyUsage[][]): MonthlyUsage[] {
     }
   }
 
-  return Array.from(monthMap.values()).sort((a, b) => a.month.localeCompare(b.month));
+  return Array.from(monthMap.values())
+    .map(finalizeMonthlyUsage)
+    .sort((a, b) => a.month.localeCompare(b.month));
 }
 
 /**
@@ -240,7 +273,6 @@ export function mergeHourlyData(sources: HourlyUsage[][]): HourlyUsage[] {
             existing.modelBreakdowns.push({ ...breakdown });
           }
         }
-        existing.modelsUsed = getModelsUsed(existing.modelBreakdowns);
       } else {
         const modelBreakdowns = hour.modelBreakdowns.map((b) => ({ ...b }));
         hourMap.set(hour.hour, {
@@ -253,7 +285,9 @@ export function mergeHourlyData(sources: HourlyUsage[][]): HourlyUsage[] {
     }
   }
 
-  return Array.from(hourMap.values()).sort((a, b) => a.hour.localeCompare(b.hour));
+  return Array.from(hourMap.values())
+    .map(finalizeHourlyUsage)
+    .sort((a, b) => a.hour.localeCompare(b.hour));
 }
 
 /**

src/web-server/usage/handlers.ts

@@ -17,7 +17,11 @@ import {
   getLastFetchTimestamp,
   refreshUsageCache,
 } from './aggregator';
-import { getModelsUsed } from './model-identity';
+import {
+  coalesceLegacyProviderlessBreakdowns,
+  getModelsUsed,
+  getProviderModelKey,
+} from './model-identity';
 
 // ============================================================================
 // Types
@@ -142,10 +146,6 @@ function calculateUsageTotalTokens(
   return input + output + cacheCreation + cacheRead;
 }
 
-function getBreakdownKey(breakdown: { modelName: string; provider?: string }): string {
-  return `${breakdown.provider ?? ''}\u0000${breakdown.modelName}`;
-}
-
 function parseDateKey(dateString: string): Date {
   return new Date(
     Date.UTC(
@@ -557,7 +557,7 @@ export async function handleModels(
 
     for (const day of filtered) {
       for (const breakdown of day.modelBreakdowns) {
-        const modelKey = getBreakdownKey(breakdown);
+        const modelKey = getProviderModelKey(breakdown);
         const existing = modelMap.get(modelKey) || {
           model: breakdown.modelName,
           provider: breakdown.provider,
@@ -750,7 +750,7 @@ export async function handleMonthly(
         existing.cacheReadTokens += day.cacheReadTokens;
         existing.totalCost += day.totalCost;
         for (const breakdown of day.modelBreakdowns) {
-          const breakdownKey = getBreakdownKey(breakdown);
+          const breakdownKey = getProviderModelKey(breakdown);
           const existingBreakdown = existing.modelBreakdowns.get(breakdownKey) ?? {
             modelName: breakdown.modelName,
             provider: breakdown.provider,
@@ -772,16 +772,21 @@ export async function handleMonthly(
       }
 
       filtered = Array.from(monthMap.values())
-        .map((month) => ({
-          month: month.month,
-          inputTokens: month.inputTokens,
-          outputTokens: month.outputTokens,
-          cacheCreationTokens: month.cacheCreationTokens,
-          cacheReadTokens: month.cacheReadTokens,
-          totalCost: month.totalCost,
-          modelBreakdowns: Array.from(month.modelBreakdowns.values()),
-          modelsUsed: getModelsUsed(Array.from(month.modelBreakdowns.values())),
-        }))
+        .map((month) => {
+          const modelBreakdowns = coalesceLegacyProviderlessBreakdowns(
+            Array.from(month.modelBreakdowns.values())
+          );
+          return {
+            month: month.month,
+            inputTokens: month.inputTokens,
+            outputTokens: month.outputTokens,
+            cacheCreationTokens: month.cacheCreationTokens,
+            cacheReadTokens: month.cacheReadTokens,
+            totalCost: month.totalCost,
+            modelBreakdowns,
+            modelsUsed: getModelsUsed(modelBreakdowns),
+          };
+        })
         .sort((a, b) => a.month.localeCompare(b.month));
     } else {
       filtered = await getCachedMonthlyData();

src/web-server/usage/model-identity.ts

@@ -5,6 +5,14 @@ export interface ProviderModelIdentity {
   provider?: string;
 }
 
+export interface MergeableProviderModelBreakdown extends ProviderModelIdentity {
+  inputTokens: number;
+  outputTokens: number;
+  cacheCreationTokens: number;
+  cacheReadTokens: number;
+  cost: number;
+}
+
 export function normalizeUsageProvider(provider: string | undefined): string | undefined {
   return normalizeModelsDevProviderId(provider);
 }
@@ -41,3 +49,46 @@ export function getModelsUsed(items: ProviderModelIdentity[]): string[] {
 
   return [...new Set(items.map((item) => getModelUsageLabel(item, ambiguousModelNames)))];
 }
+
+function addBreakdownTokens<T extends MergeableProviderModelBreakdown>(target: T, source: T): void {
+  target.inputTokens += source.inputTokens;
+  target.outputTokens += source.outputTokens;
+  target.cacheCreationTokens += source.cacheCreationTokens;
+  target.cacheReadTokens += source.cacheReadTokens;
+  target.cost += source.cost;
+}
+
+export function coalesceLegacyProviderlessBreakdowns<T extends MergeableProviderModelBreakdown>(
+  items: T[]
+): T[] {
+  const byModel = new Map<string, T[]>();
+  for (const item of items) {
+    const existing = byModel.get(item.modelName) ?? [];
+    existing.push(item);
+    byModel.set(item.modelName, existing);
+  }
+
+  const coalesced: T[] = [];
+  for (const group of byModel.values()) {
+    const providerBreakdowns = group.filter((item) => getProviderKey(item.provider));
+    const legacyBreakdowns = group.filter((item) => !getProviderKey(item.provider));
+    const providerKeys = new Set(providerBreakdowns.map((item) => getProviderKey(item.provider)));
+
+    if (legacyBreakdowns.length > 0 && providerKeys.size === 1 && providerBreakdowns.length > 0) {
+      const provider = Array.from(providerKeys)[0];
+      const [firstProviderBreakdown, ...remainingProviderBreakdowns] = providerBreakdowns;
+      const merged = { ...firstProviderBreakdown, provider } as T;
+
+      for (const breakdown of [...remainingProviderBreakdowns, ...legacyBreakdowns]) {
+        addBreakdownTokens(merged, breakdown);
+      }
+
+      coalesced.push(merged);
+      continue;
+    }
+
+    coalesced.push(...group.map((item) => ({ ...item })));
+  }
+
+  return coalesced;
+}

tests/unit/model-pricing.test.ts

@@ -355,6 +355,17 @@ describe('model-pricing', () => {
             },
           },
         },
+        google: {
+          id: 'google',
+          name: 'Google',
+          models: {
+            'gemini-3-flash-preview': {
+              id: 'gemini-3-flash-preview',
+              name: 'Gemini 3 Flash Preview',
+              cost: { input: 99, output: 99 },
+            },
+          },
+        },
       });
     });
 
@@ -388,6 +399,14 @@ describe('model-pricing', () => {
       expect(getModelPricing('gpt-4o').inputPerMillion).toBe(2.5);
     });
 
+    it('keeps CCS compatibility aliases ahead of provider-aware models.dev matches', () => {
+      const pricing = getModelPricing('gemini-3-flash-preview', { provider: 'google' });
+      const canonical = getModelPricing('gemini-2.5-flash');
+
+      expect(pricing).toEqual(canonical);
+      expect(pricing.inputPerMillion).not.toBe(99);
+    });
+
     it('falls back to CCS static pricing when provider-aware models.dev lookup misses a known model', () => {
       const staticPricing = getModelPricing('claude-sonnet-4-5');
 

tests/unit/web-server/usage-aggregator-cliproxy-integration.test.ts

@@ -330,6 +330,136 @@ describe('usage aggregator cliproxy integration', () => {
     expect(result[0].modelBreakdowns).toHaveLength(2);
   });
 
+  it('coalesces legacy providerless breakdowns into the only known provider', () => {
+    const result = aggregator.mergeDailyData([
+      [
+        {
+          date: '2026-03-02',
+          source: 'legacy-cache',
+          inputTokens: 10,
+          outputTokens: 1,
+          cacheCreationTokens: 0,
+          cacheReadTokens: 0,
+          cost: 1,
+          totalCost: 1,
+          modelsUsed: ['gpt-5.5'],
+          modelBreakdowns: [
+            {
+              modelName: 'gpt-5.5',
+              inputTokens: 10,
+              outputTokens: 1,
+              cacheCreationTokens: 0,
+              cacheReadTokens: 0,
+              cost: 1,
+            },
+          ],
+        },
+      ],
+      [
+        {
+          date: '2026-03-02',
+          source: 'cliproxy',
+          inputTokens: 20,
+          outputTokens: 2,
+          cacheCreationTokens: 0,
+          cacheReadTokens: 0,
+          cost: 2,
+          totalCost: 2,
+          modelsUsed: ['gpt-5.5'],
+          modelBreakdowns: [
+            {
+              modelName: 'gpt-5.5',
+              provider: 'openai',
+              inputTokens: 20,
+              outputTokens: 2,
+              cacheCreationTokens: 0,
+              cacheReadTokens: 0,
+              cost: 2,
+            },
+          ],
+        },
+      ],
+    ]);
+
+    expect(result[0].modelBreakdowns).toHaveLength(1);
+    expect(result[0].modelBreakdowns[0]).toMatchObject({
+      modelName: 'gpt-5.5',
+      provider: 'openai',
+      inputTokens: 30,
+      outputTokens: 3,
+      cost: 3,
+    });
+    expect(result[0].modelsUsed).toEqual(['gpt-5.5']);
+  });
+
+  it('keeps legacy providerless breakdowns separate when providers are ambiguous', () => {
+    const result = aggregator.mergeHourlyData([
+      [
+        {
+          hour: '2026-03-02 10:00',
+          source: 'legacy-cache',
+          inputTokens: 10,
+          outputTokens: 1,
+          cacheCreationTokens: 0,
+          cacheReadTokens: 0,
+          cost: 1,
+          totalCost: 1,
+          modelsUsed: ['gpt-5.5'],
+          modelBreakdowns: [
+            {
+              modelName: 'gpt-5.5',
+              inputTokens: 10,
+              outputTokens: 1,
+              cacheCreationTokens: 0,
+              cacheReadTokens: 0,
+              cost: 1,
+            },
+          ],
+        },
+      ],
+      [
+        {
+          hour: '2026-03-02 10:00',
+          source: 'providers',
+          inputTokens: 50,
+          outputTokens: 5,
+          cacheCreationTokens: 0,
+          cacheReadTokens: 0,
+          cost: 5,
+          totalCost: 5,
+          modelsUsed: ['openai/gpt-5.5', 'github-copilot/gpt-5.5'],
+          modelBreakdowns: [
+            {
+              modelName: 'gpt-5.5',
+              provider: 'openai',
+              inputTokens: 20,
+              outputTokens: 2,
+              cacheCreationTokens: 0,
+              cacheReadTokens: 0,
+              cost: 2,
+            },
+            {
+              modelName: 'gpt-5.5',
+              provider: 'github-copilot',
+              inputTokens: 30,
+              outputTokens: 3,
+              cacheCreationTokens: 0,
+              cacheReadTokens: 0,
+              cost: 3,
+            },
+          ],
+        },
+      ],
+    ]);
+
+    expect(result[0].modelBreakdowns).toHaveLength(3);
+    expect(result[0].modelsUsed).toEqual([
+      'gpt-5.5',
+      'openai/gpt-5.5',
+      'github-copilot/gpt-5.5',
+    ]);
+  });
+
   it('falls back to model cardinality when merging legacy hourly buckets without requestCount', () => {
     const result = aggregator.mergeHourlyData([
       [