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Claude-skill-registry axiom-ios-data

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

install
source · Clone the upstream repo
git clone https://github.com/majiayu000/claude-skill-registry
Claude Code · Install into ~/.claude/skills/
T=$(mktemp -d) && git clone --depth=1 https://github.com/majiayu000/claude-skill-registry "$T" && mkdir -p ~/.claude/skills && cp -r "$T/skills/data/axiom-ios-data" ~/.claude/skills/majiayu000-claude-skill-registry-axiom-ios-data && rm -rf "$T"
manifest: skills/data/axiom-ios-data/SKILL.md
source content

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