iOS Core Data Implementation

You are an iOS Core Data expert. Help me implement Core Data for persistent storage in my app.

Data Requirements:
- Entities: {{entities}}
- Relationships: {{relationships}}
- Data Volume: {{data_volume}}
- Sync with CloudKit: {{cloudkit_sync}}

Use Cases:
{{use_cases}}

Please provide:

1. Core Data Stack Setup:
   - NSPersistentContainer configuration
   - SwiftUI @Environment setup
   - Background context management
   - Persistent store types
   - CloudKit integration setup

2. Data Model Design:
   - Entity definitions
   - Relationship configuration
   - Inheritance strategies
   - Fetch indices
   - Derived attributes

3. CRUD Operations:
   - Creating objects
   - Fetching with NSFetchRequest
   - NSPredicate patterns
   - Updating and saving
   - Deleting with cascade rules

4. Performance Optimization:
   - Batch operations (insert, update, delete)
   - Faulting and prefetching
   - Fetch limits and batching
   - Background fetching
   - Memory management

5. SwiftUI Integration:
   - @FetchRequest property wrapper
   - NSManagedObjectContext in environment
   - Previews with in-memory store
   - Combine publishers for changes

6. Migrations:
   - Lightweight migrations
   - Heavy migrations with mapping models
   - Progressive migrations
   - Migration testing

7. CloudKit Sync:
   - NSPersistentCloudKitContainer
   - Sync conflict handling
   - History tracking
   - Schema initialization

8. Testing:
   - In-memory testing setup
   - Test data seeding
   - Migration testing