[CORE-DATA] Create Core Data Models and Schema

[DrunkOnJava]

📋 Sub-task of Epic #86

Problem

No Core Data models (.xcdatamodeld) exist in the project. Need to create proper entity definitions.

Required Entities

Item Entity

• id: UUID
• name: String
• brand: String?
• model: String?
• category: String (enum raw value)
• condition: String (enum raw value)
• quantity: Int32
• value: Decimal (as NSDecimalNumber)
• purchasePrice: Decimal?
• purchaseDate: Date?
• notes: String?
• barcode: String?
• serialNumber: String?
• tags: Transformable (array of strings)
• imageIds: Transformable (array of UUIDs)
• locationId: UUID?
• warrantyId: UUID?
• createdAt: Date
• updatedAt: Date

Location Entity

• id: UUID
• name: String
• type: String (enum raw value)
• parentId: UUID?
• customFields: Transformable (dictionary)
• createdAt: Date
• updatedAt: Date

Photo Entity

• id: UUID
• itemId: UUID
• imageData: Binary
• thumbnailData: Binary
• metadata: Transformable
• uploadedAt: Date

Receipt Entity

• id: UUID
• storeName: String
• purchaseDate: Date
• totalAmount: Decimal
• taxAmount: Decimal?
• items: Transformable
• imageData: Binary?
• ocrText: String?
• createdAt: Date

Relationships

• Item -> Location (many-to-one)
• Item -> Photos (one-to-many)
• Item -> Receipts (many-to-many)
• Location -> Location (self-referential for hierarchy)

Migration Strategy

• Version 1: Initial schema
• Include lightweight migration support
• Plan for future CloudKit integration

Acceptance Criteria

• .xcdatamodeld file created with all entities
• Proper data types and constraints
• Relationships configured correctly
• Indexes on frequently queried fields
• Migration policy defined
• NSManagedObject subclasses generated

[DrunkOnJava]

Closing: This issue has been resolved/superseded by the complete modular architecture restructure now in main branch (commit 33a0ead). The new architecture implements a comprehensive solution that addresses the core needs this issue was tracking.