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ios-data

@CharlesWiltgen/Axiom
64
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Use when working with ANY data persistence, database, storage, CloudKit, migration, or serialization. Covers SwiftData, Core Data, GRDB, SQLite, CloudKit sync, file storage, Codable, migrations.

Install Skill

1Download skill
2Enable skills in Claude

Open claude.ai/settings/capabilities and find the "Skills" section

3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name ios-data
description Use when working with ANY data persistence, database, storage, CloudKit, migration, or serialization. Covers SwiftData, Core Data, GRDB, SQLite, CloudKit sync, file storage, Codable, migrations.

iOS Data & Persistence Router

You MUST use this skill for ANY data persistence, database, storage, CloudKit, or serialization work.

When to Use

Use this router 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

Routing Logic

SwiftData

Working with SwiftData → /skill swiftdata Schema migration → /skill swiftdata-migration Migration issues → /skill swiftdata-migration-diag Migrating from Realm → /skill realm-migration-ref SwiftData vs SQLiteData → /skill swiftdata-to-sqlitedata

Other Databases

GRDB queries → /skill grdb SQLiteData → /skill sqlitedata Advanced SQLiteData → /skill sqlitedata-ref Core Data issues → /skill core-data-diag

Migrations

Database migration safety → /skill database-migration (critical - prevents data loss)

Serialization

Codable issues → /skill codable

Cloud Storage

CloudKit → /skill cloudkit-ref iCloud Drive → /skill icloud-drive-ref Cloud sync errors → /skill cloud-sync-diag

File Storage

Storage strategy → /skill storage-strategy Storage issues → /skill storage-diag Storage management → /skill storage-management-ref File protection → /skill file-protection-ref

Decision Tree

User asks about data/storage
  ├─ Database?
  │  ├─ SwiftData? → swiftdata, swiftdata-migration
  │  ├─ Core Data? → core-data-diag
  │  ├─ GRDB? → grdb
  │  └─ SQLiteData? → sqlitedata
  │
  ├─ Migration? → database-migration (ALWAYS - prevents data loss)
  │
  ├─ Cloud storage?
  │  ├─ CloudKit? → cloudkit-ref
  │  ├─ iCloud Drive? → icloud-drive-ref
  │  └─ Sync errors? → cloud-sync-diag
  │
  ├─ Serialization? → codable
  │
  └─ File storage? → storage-strategy, storage-diag, storage-management-ref

Critical Pattern: Migrations

ALWAYS invoke /skill database-migration when adding/modifying database columns.

This prevents:

  • "FOREIGN KEY constraint failed" errors
  • "no such column" crashes
  • Data loss from unsafe migrations

Example Invocations

User: "I need to add a column to my SwiftData model" → Invoke: /skill database-migration (critical - prevents data loss)

User: "How do I query SwiftData with complex filters?" → Invoke: /skill swiftdata

User: "CloudKit sync isn't working" → Invoke: /skill cloud-sync-diag

User: "Should I use SwiftData or SQLiteData?" → Invoke: /skill swiftdata-to-sqlitedata