chore(ai-proxy): remove expired isActiveReviewPromo and related code (#1688)

* chore(ai-proxy): remove expired isActiveReviewPromo and related code

The Sonnet 4.6 free review promo (Feb 18-25, 2026) has ended. Remove
all promo logic: the isActiveReviewPromo function, REVIEW_PROMO_*
constants, balance gate bypass, cost zeroing, response rewriting,
admin stats endpoint, UI '(free)' badge, promo logging, and the
test/migration scripts.

* Format

---------

Co-authored-by: kiloconnect[bot] <240665456+kiloconnect[bot]@users.noreply.github.com>
Co-authored-by: Christiaan Arnoldus <christiaan@kilocode.ai>
Co-authored-by: Christiaan Arnoldus <christiaan.arnoldus@outlook.com>

Author: kilo-code-bot[bot]

src/app/api/openrouter/[...path]/route.ts

@@ -75,7 +75,6 @@ import { handleRequestLogging } from '@/lib/handleRequestLogging';
 import { grokCodeFastOptimizedRequest } from '@/lib/custom-llm/customLlmRequest';
 import { normalizeModelId } from '@/lib/model-utils';
 import { isForbiddenFreeModel } from '@/lib/forbidden-free-models';
-import { isActiveReviewPromo } from '@/lib/code-reviews/core/constants';
 import { isCloudflareIP } from '@/lib/cloudflare-ip';
 import { applyResolvedAutoModel, isKiloAutoModel } from '@/lib/kilo-auto-model';
 import { fixOpenCodeDuplicateReasoning } from '@/lib/providers/fixOpenCodeDuplicateReasoning';
@@ -416,12 +415,7 @@ export async function POST(request: NextRequest): Promise<NextResponseType<unkno
   if (!isAnonymousContext(user) && !bypassAccessCheck) {
     const { balance, settings, plan } = await balanceAndSettingsPromise;
 
-    if (
-      balance <= 0 &&
-      !isFreeModel(originalModelIdLowerCased) &&
-      !userByok &&
-      !isActiveReviewPromo(botId, originalModelIdLowerCased)
-    ) {
+    if (balance <= 0 && !isFreeModel(originalModelIdLowerCased) && !userByok) {
       return await usageLimitExceededResponse(user, balance);
     }
 
@@ -605,8 +599,7 @@ export async function POST(request: NextRequest): Promise<NextResponseType<unkno
 
   const isFreeModelRequiringCostRemoval =
     (provider.id === 'openrouter' || provider.id === 'vercel') &&
-    (isKiloFreeModel(originalModelIdLowerCased) ||
-      isActiveReviewPromo(botId, originalModelIdLowerCased));
+    isKiloFreeModel(originalModelIdLowerCased);
   const isStealthModelRequiringNameRemoval = isKiloStealthModel(originalModelIdLowerCased);
   const isProviderRequiringResponseFixes = provider.id === 'corethink';
 

src/components/code-reviews/ReviewConfigForm.tsx

@@ -31,7 +31,6 @@ import { ModelCombobox } from '@/components/shared/ModelCombobox';
 import { cn } from '@/lib/utils';
 import { RepositoryMultiSelect, type Repository } from './RepositoryMultiSelect';
 import { PRIMARY_DEFAULT_MODEL } from '@/lib/models';
-import { REVIEW_PROMO_MODEL, REVIEW_PROMO_END } from '@/lib/code-reviews/core/constants';
 import {
   getAvailableThinkingEfforts,
   thinkingEffortLabel,
@@ -195,14 +194,6 @@ export function ReviewConfigForm({
   // Fetch available models
   const { modelOptions, isLoadingModels } = useOrganizationModels(organizationId);
 
-  const promoModelOptions = useMemo(() => {
-    const promoActive = Date.now() < Date.parse(REVIEW_PROMO_END);
-    if (!promoActive) return modelOptions;
-    return modelOptions.map(m =>
-      m.id === REVIEW_PROMO_MODEL ? { ...m, name: `${m.name} (free)` } : m
-    );
-  }, [modelOptions]);
-
   // Local state
   const [isEnabled, setIsEnabled] = useState(false);
   const [reviewStyle, setReviewStyle] = useState<'strict' | 'balanced' | 'lenient' | 'roast'>(
@@ -553,7 +544,7 @@ export function ReviewConfigForm({
             {/* AI Model Selection */}
             <ModelCombobox
               label="AI Model"
-              models={promoModelOptions}
+              models={modelOptions}
               value={selectedModel}
               onValueChange={setSelectedModel}
               isLoading={isLoadingModels}

src/lib/code-reviews/core/constants.ts

@@ -16,22 +16,6 @@ export const DEFAULT_CODE_REVIEW_MODEL = 'anthropic/claude-sonnet-4.6';
  */
 export const DEFAULT_CODE_REVIEW_MODE = 'code' as const;
 
-// ============================================================================
-// Sonnet 4.6 Review Promotion
-// ============================================================================
-
-export const REVIEW_PROMO_MODEL = 'anthropic/claude-sonnet-4.6';
-export const REVIEW_PROMO_START = '2026-02-18T14:00:00Z'; // used only for admin logging
-export const REVIEW_PROMO_END = '2026-02-25T14:00:00Z';
-
-/** Single source of truth: is the free-review promo active for this request? */
-export function isActiveReviewPromo(botId: string | undefined, model: string): boolean {
-  if (botId !== 'reviewer') return false;
-  if (model !== REVIEW_PROMO_MODEL) return false;
-
-  return Date.now() < Date.parse(REVIEW_PROMO_END);
-}
-
 // ============================================================================
 // Feature Flags
 // ============================================================================

src/lib/code-reviews/triggers/prepare-review-payload.ts

@@ -42,9 +42,6 @@ import {
   DEFAULT_CODE_REVIEW_MODEL,
   DEFAULT_CODE_REVIEW_MODE,
   FEATURE_FLAG_INCREMENTAL_REVIEW,
-  isActiveReviewPromo,
-  REVIEW_PROMO_START,
-  REVIEW_PROMO_END,
 } from '../core/constants';
 import type { Owner } from '../core';
 import { generateReviewPrompt } from '../prompts/generate-prompt';
@@ -440,16 +437,6 @@ export async function prepareReviewPayload(
             ...(gateThreshold !== 'off' ? { gateThreshold } : {}),
           };
 
-    if (isActiveReviewPromo('reviewer', sessionInput.model)) {
-      logExceptInTest('[prepareReviewPayload] Promotional model selected for code review', {
-        reviewId,
-        owner,
-        model: sessionInput.model,
-        promoStart: REVIEW_PROMO_START,
-        promoEnd: REVIEW_PROMO_END,
-      });
-    }
-
     // Log the session input for GitLab
     if (platform === PLATFORM.GITLAB) {
       logExceptInTest('[prepareReviewPayload] GitLab session input prepared', {

src/lib/processUsage.ts

@@ -28,7 +28,6 @@ import { getEffectiveKiloPassThreshold } from '@/lib/kilo-pass/threshold';
 import { appendKiloPassAuditLog } from '@/lib/kilo-pass/issuance';
 import { KiloPassAuditLogAction, KiloPassAuditLogResult } from '@/lib/kilo-pass/enums';
 import { reportAbuseCost } from '@/lib/abuse-service';
-import { isActiveReviewPromo } from '@/lib/code-reviews/core/constants';
 import type {
   BalanceUpdateResult,
   ChatCompletionChunk,
@@ -839,14 +838,10 @@ async function processTokenData(
     console.error('[Abuse] Failed to report cost:', error);
   });
 
-  // Preserve the real cost before zeroing for free/BYOK/promo
+  // Preserve the real cost before zeroing for free/BYOK
   usageStats.market_cost = usageStats.cost_mUsd;
 
-  if (
-    isFreeModel(usageContext.requested_model) ||
-    usageContext.user_byok ||
-    isActiveReviewPromo(usageContext.botId, usageContext.requested_model)
-  ) {
+  if (isFreeModel(usageContext.requested_model) || usageContext.user_byok) {
     usageStats.cost_mUsd = 0;
     usageStats.cacheDiscount_mUsd = 0;
   }

src/routers/admin-code-reviews-router.ts

@@ -1,20 +1,8 @@
 import { adminProcedure, createTRPCRouter } from '@/lib/trpc/init';
 import { db } from '@/lib/drizzle';
-import {
-  cloud_agent_code_reviews,
-  kilocode_users,
-  microdollar_usage,
-  microdollar_usage_metadata,
-  organizations,
-} from '@kilocode/db/schema';
+import { cloud_agent_code_reviews, kilocode_users, organizations } from '@kilocode/db/schema';
 import * as z from 'zod';
 import { sql, and, gte, lt, eq, isNotNull, isNull, desc, ilike, or, type SQL } from 'drizzle-orm';
-import {
-  REVIEW_PROMO_MODEL,
-  REVIEW_PROMO_START,
-  REVIEW_PROMO_END,
-  isActiveReviewPromo,
-} from '@/lib/code-reviews/core/constants';
 
 /**
  * SQL condition that identifies billing/credits errors (402 Payment Required).
@@ -639,67 +627,4 @@ export const adminCodeReviewsRouter = createTRPCRouter({
 
       return result;
     }),
-
-  getReviewPromotionStats: adminProcedure.query(async () => {
-    // Aggregates: total requests, unique users, unique orgs
-    const aggregates = await db
-      .select({
-        total_requests: sql<number>`COUNT(*)`,
-        unique_users: sql<number>`COUNT(DISTINCT ${microdollar_usage.kilo_user_id})`,
-        unique_orgs: sql<number>`COUNT(DISTINCT ${microdollar_usage.organization_id})`,
-      })
-      .from(microdollar_usage)
-      .innerJoin(
-        microdollar_usage_metadata,
-        eq(microdollar_usage.id, microdollar_usage_metadata.id)
-      )
-      .where(
-        and(
-          eq(microdollar_usage.requested_model, REVIEW_PROMO_MODEL),
-          eq(microdollar_usage.cost, 0),
-          sql`(${microdollar_usage_metadata.is_user_byok} IS NULL OR ${microdollar_usage_metadata.is_user_byok} = false)`,
-          gte(microdollar_usage.created_at, REVIEW_PROMO_START),
-          lt(microdollar_usage.created_at, REVIEW_PROMO_END)
-        )
-      );
-
-    // Daily breakdown
-    const daily = await db
-      .select({
-        day: sql<string>`DATE_TRUNC('day', ${microdollar_usage.created_at})::date::text`,
-        total: sql<number>`COUNT(*)`,
-        unique_users: sql<number>`COUNT(DISTINCT ${microdollar_usage.kilo_user_id})`,
-      })
-      .from(microdollar_usage)
-      .innerJoin(
-        microdollar_usage_metadata,
-        eq(microdollar_usage.id, microdollar_usage_metadata.id)
-      )
-      .where(
-        and(
-          eq(microdollar_usage.requested_model, REVIEW_PROMO_MODEL),
-          eq(microdollar_usage.cost, 0),
-          sql`(${microdollar_usage_metadata.is_user_byok} IS NULL OR ${microdollar_usage_metadata.is_user_byok} = false)`,
-          gte(microdollar_usage.created_at, REVIEW_PROMO_START),
-          lt(microdollar_usage.created_at, REVIEW_PROMO_END)
-        )
-      )
-      .groupBy(sql`DATE_TRUNC('day', ${microdollar_usage.created_at})`)
-      .orderBy(sql`DATE_TRUNC('day', ${microdollar_usage.created_at})`);
-
-    const agg = aggregates[0];
-    return {
-      promoActive: isActiveReviewPromo('reviewer', REVIEW_PROMO_MODEL),
-      promoStart: REVIEW_PROMO_START,
-      promoEnd: REVIEW_PROMO_END,
-      totalRequests: Number(agg.total_requests) || 0,
-      uniqueUsers: Number(agg.unique_users) || 0,
-      uniqueOrgs: Number(agg.unique_orgs) || 0,
-      daily: daily.map(row => ({
-        day: row.day,
-        total: Number(row.total) || 0,
-        uniqueUsers: Number(row.unique_users) || 0,
-      })),
-    };
-  }),
 });