Core Data Diagnostics & Migration FAQs

Question 1

When should I use this skill in my development workflow?

Accepted Answer

You should activate this skill when your app experiences 'unresolvable fault' crashes during launch, exhibits 'accessing NSManagedObject on a different thread' errors, or shows performance degradation after adding new relationships to your data model.

Question 2

What specific performance optimizations does it provide?

Accepted Answer

The skill provides patterns for SQL debugging, relationship prefetching, and batch sizing. It uses systematic SQL log analysis to identify and eliminate N+1 query patterns that cause mobile apps to lag during data fetching.

Question 3

What does the Core Data Diagnostics & Migration skill do?

Accepted Answer

This skill provides a systematic framework for Claude to diagnose and resolve complex Core Data issues. It focuses on identifying schema migration crashes, fixing thread-confinement concurrency errors, and optimizing N+1 query performance bottlenecks in iOS and macOS applications.

Question 4

How does this skill improve migration safety?

Accepted Answer

It implements a 'safety-first' approach by forcing diagnostics before code changes. It helps distinguish between lightweight and heavy migrations and mandates testing on real devices to avoid the common pitfall where migrations work in a simulator but fail in production.

Question 5

Does this skill help with SwiftData and Core Data interoperability?

Accepted Answer

Yes, it includes specific patterns for bridging SwiftData and Core Data. It helps resolve 'store is locked' errors and architectural conflicts when an app uses both frameworks simultaneously on the same persistent store.

Core Data Diagnostics & Migration

Core Data Diagnostics & Migration

Key Features

Use Cases

Key Features

Use Cases