Data & Persistence You MUST use this skill for ANY data persistence, database, storage, CloudKit, or serialization work. When to Use Use this skill when working with: - Databases (SwiftData, Core Data, GRDB, SQLiteData) - Schema migrations - CloudKit sync - File storage (iCloud Drive, local storage) - Data serialization (Codable, JSON) - Storage strategy decisions - Keychain / secure credential storage - Encryption, signing, key management (CryptoKit) Quick Reference | Symptom / Task | Reference | |----------------|-----------| | SwiftData @Model, @Query, ModelContext | See | | SwiftData sche…