fix: bump pcat cache prefix to invalidate stale empty results

Old queries cached empty arrays for groups and schemas. Bumping cache
key prefix from "pcat:" to "pcat2:" so new correct queries bypass stale
entries without needing manual Redis flush.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/api/src/catalog/pcat-catalog.service.ts

@@ -62,6 +62,8 @@ export interface PcatSchemaDetailDto {
   hotspots: { id: string; key: string; group: number; shape: "rect"; coordinates: number[]; label: string }[];
 }
 
+const CACHE_PREFIX = "pcat2"; // bumped to invalidate stale cache from v1 queries
+
 const CACHE_TTL = {
   catalogs: 86400,
   models: 43200,
@@ -81,7 +83,7 @@ export class PcatCatalogService {
   ) {}
 
   async getCatalogs(): Promise<PcatCatalogDto[]> {
-    const cacheKey = "pcat:catalogs";
+    const cacheKey = `${CACHE_PREFIX}:catalogs`;
     const cached = await this.redis.getJson<PcatCatalogDto[]>(cacheKey);
     if (cached) return cached;
 
@@ -108,7 +110,7 @@ export class PcatCatalogService {
   }
 
   async getModels(catalogId: string): Promise<PcatModelDto[]> {
-    const cacheKey = `pcat:models:${catalogId}`;
+    const cacheKey = `${CACHE_PREFIX}:models:${catalogId}`;
     const cached = await this.redis.getJson<PcatModelDto[]>(cacheKey);
     if (cached) return cached;
 
@@ -139,7 +141,7 @@ export class PcatCatalogService {
   }
 
   async getCars(modelId: string): Promise<PcatCarDto[]> {
-    const cacheKey = `pcat:cars:${modelId}`;
+    const cacheKey = `${CACHE_PREFIX}:cars:${modelId}`;
     const cached = await this.redis.getJson<PcatCarDto[]>(cacheKey);
     if (cached) return cached;
 
@@ -184,7 +186,7 @@ export class PcatCatalogService {
   }
 
   async getCarGroups(carId: string, parentId?: string): Promise<PcatGroupDto[]> {
-    const cacheKey = `pcat:car-groups:${carId}:${parentId || "root"}`;
+    const cacheKey = `${CACHE_PREFIX}:car-groups:${carId}:${parentId || "root"}`;
     const cached = await this.redis.getJson<PcatGroupDto[]>(cacheKey);
     if (cached) return cached;
 
@@ -233,7 +235,7 @@ export class PcatCatalogService {
   }
 
   async getSchemaImages(carId: string, groupId: string): Promise<PcatSchemaImageDto[]> {
-    const cacheKey = `pcat:schemas:${carId}:${groupId}`;
+    const cacheKey = `${CACHE_PREFIX}:schemas:${carId}:${groupId}`;
     const cached = await this.redis.getJson<PcatSchemaImageDto[]>(cacheKey);
     if (cached) return cached;
 
@@ -257,7 +259,7 @@ export class PcatCatalogService {
   }
 
   async getSchemaDetail(schemaImageId: string): Promise<PcatSchemaDetailDto> {
-    const cacheKey = `pcat:schema-detail:${schemaImageId}`;
+    const cacheKey = `${CACHE_PREFIX}:schema-detail:${schemaImageId}`;
     const cached = await this.redis.getJson<PcatSchemaDetailDto>(cacheKey);
     if (cached) return cached;