axiom-ios-data

# iOS Data & Persistence Router

**You MUST use this skill for ANY data persistence, database, axiom-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 axiom-swiftdata`
**Schema migration** → `/skill axiom-swiftdata-migration`
**Migration issues** → `/skill axiom-swiftdata-migration-diag`
**Migrating from Realm** → `/skill axiom-realm-migration-ref`
**SwiftData vs SQLiteData** → `/skill axiom-sqlitedata-migration`

### Other Databases

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

### Migrations

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

### Serialization

**Codable issues** → `/skill axiom-codable`

### Cloud Storage

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

### File Storage

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

## Decision Tree

1. SwiftData? → swiftdata, swiftdata-migration
2. Core Data? → core-data, core-data-diag
3. GRDB? → grdb
4. SQLiteData? → sqlitedata, sqlitedata-ref
5. ANY schema migration? → database-migration (ALWAYS — prevents data loss)
6. Realm migration? → realm-migration-ref
7. SwiftData vs SQLiteData? → sqlitedata-migration
8. Cloud sync architecture? → cl