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

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

Critical Pattern: Migrations

ALWAYS invoke /skill axiom-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 axiom-database-migration (critical - prevents data loss)

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

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

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