core-data-expert

Expert Core Data guidance for iOS/macOS stack setup, migrations, threading, and CloudKit sync. Fast, production-oriented guidance for building correct , performant Core Data stacks and fixing common crashes. - Covers stack initialization, fetch requests, NSFetchedResultsController, saving patterns, and merge conflict resolution across all Core Data store types - Provides threading best practices for both traditional perform/performAndWait patterns and Swift Concurrency with actors and Sendable types - Includes batch operations, persistent history tracking, lightweight and staged migrations, and performance profiling strategies - Addresses NSPersistentCloudKitContainer integration, schema immutability in production, and cross-context object communication via NSManagedObjectID - Offers rapid triage templates and error-to-reference routing for common crashes and configuration issues - Determine OS/deployment target when advice depends on availability (iOS 14+/17+ features, etc.). - Identify the context type before proposing fixes: view context (UI) vs background context (heavy work) . - Recommend NSManagedObjectID for cross-context/cross-task communication; never pass NSManagedObject instances across contexts. - Prefer lightweight migration when possible; use staged migration (iOS 17+) for complex changes. - When recommending batch operations, verify persistent history tracking...