# Cache Builder Consolidation Complete

## Summary

Successfully consolidated the video category/tag cache builder to use only the core version. Eliminated the duplicate app-level builder and wired the core builder into the box-mgnt-api cache warmup flow.

## Changes Made

### 1. ✅ Removed Duplicate App-Level Builder

**Deleted file:**

- `apps/box-mgnt-api/src/cache/video-category-cache.builder.ts`

**Verification:**

- App-level cache directory now contains only: `adpool-warmup.service.ts`, `video-category-warmup.service.ts`, `video-list-cache.builder.ts`, `video-list-warmup.service.ts`

### 2. ✅ Established Clean Core Exports

Created index files for proper module organization:

**libs/core/src/cache/video/index.ts**

```typescript
export {
  VideoCategoryCacheBuilder,
  VideoCategoryPayload,
  VideoTagPayload,
} from './video-category-cache.builder';
export { VideoCategoryWarmupService } from './video-category-warmup.service';
```

**libs/core/src/cache/index.ts** (top-level cache exports)

```typescript
export * from './video';
export * from './category';
export * from './tag';
export * from './channel';
```

**libs/core/src/cache/{category,tag,channel}/index.ts** (supporting modules)

- Each now exports its builder, cache service, and warmup service

### 3. ✅ Wired Core Builder into Box-MGNT-API Warmup

**Updated: apps/box-mgnt-api/src/cache/video-category-warmup.service.ts**

```typescript
import { VideoCategoryCacheBuilder } from '@box/core/cache/video';

@Injectable()
export class VideoCategoryWarmupService implements OnModuleInit {
  constructor(private readonly builder: VideoCategoryCacheBuilder) {}

  async onModuleInit(): Promise<void> {
    await this.builder.buildAll();
    // ...
  }
}
```

**Updated: apps/box-mgnt-api/src/app.module.ts**

- Removed: `import { VideoCategoryCacheBuilder } from './cache/video-category-cache.builder';`
- Removed: `VideoCategoryCacheBuilder` from providers array
- Kept: `VideoCategoryWarmupService` which now imports from core

### 4. ✅ Verification

**Test Suite Results:**

- ✅ Typecheck: PASS (0 errors)
- ✅ Lint: PASS (0 warnings)
- ✅ Build (box-mgnt-api): PASS

**Architecture Verification:**

- ✅ Core builder still extends `BaseCacheBuilder`
- ✅ Core builder is exported via `@box/core/cache/video`
- ✅ App-level warmup service imports from core
- ✅ No duplicate builders remain
- ✅ Dependency injection chain intact

## Import Paths

Now use these clean import paths across the project:

```typescript
// Video category/tag caching
import {
  VideoCategoryCacheBuilder,
  VideoCategoryPayload,
  VideoTagPayload,
} from '@box/core/cache/video';

// Top-level cache access (when needed)
import {} from /* any cache component */ '@box/core/cache';
```

## Architecture

```
libs/core/src/cache/
├── cache-manager.module.ts          (exports all cache builders)
├── index.ts                         (barrel exports)
├── video/
│   ├── video-category-cache.builder.ts  (canonical)
│   ├── video-category-warmup.service.ts
│   └── index.ts                        (exports)
├── category/
│   ├── category-cache.builder.ts
│   ├── category-cache.service.ts
│   ├── category-warmup.service.ts
│   └── index.ts
├── tag/
│   ├── tag-cache.builder.ts
│   ├── tag-cache.service.ts
│   ├── tag-warmup.service.ts
│   └── index.ts
└── channel/
    ├── channel-cache.builder.ts
    ├── channel-cache.service.ts
    ├── channel-warmup.service.ts
    └── index.ts

apps/box-mgnt-api/src/cache/
├── adpool-warmup.service.ts         (local - not migrated)
├── video-category-warmup.service.ts (imports core builder)
├── video-list-cache.builder.ts      (local - app-specific)
└── video-list-warmup.service.ts     (local)
```

## Benefits

1. **Single Source of Truth**: One canonical `VideoCategoryCacheBuilder` in core
2. **Clean Imports**: `@box/core/cache/video` path for video builders
3. **Reduced Duplication**: Eliminated redundant code
4. **Better Maintainability**: Changes to cache logic happen in one place
5. **Consistent Pattern**: Follows existing cache builder pattern from channel, category, tag builders

## Next Steps

If you need to create additional cache builders:

1. Implement in `libs/core/src/cache/{entity}/`
2. Export via index file
3. Import in app-level warmup service
4. No duplicate app-level builders needed