feat(ios): complete P2.1 schema versioning and P2.2 combined edge case tests
P2.1: iOS Schema Versioning Strategy
- Added SCHEMA_VERSION constant and checkSchemaVersion() method in PersistenceController
- Version stored in NSPersistentStore metadata (observability contract, not migration gate)
- CoreData auto-migration remains authoritative; version mismatches logged, not blocked
- Documentation added to ios/Plugin/README.md with migration contract
P2.2: Combined Edge Case Tests
- Added 3 resilience test scenarios to DailyNotificationRecoveryTests.swift:
- test_combined_dst_boundary_duplicate_delivery_cold_start()
- test_combined_rollover_duplicate_delivery_cold_start()
- test_combined_schema_version_cold_start_recovery()
- All tests labeled with @resilience @combined-scenarios comments
- Tests verify idempotency and correctness under combined stressors
P2.3: Android Combined Tests Design
- Created P2.3-DESIGN.md with scope, invariants, and acceptance criteria
- Created P2.3-IMPLEMENTATION-CHECKLIST.md with step-by-step execution plan
- Design ready for implementation to achieve parity with iOS P2.2
Documentation Updates
- Fixed parity matrix: iOS invalid data handling now correctly shows "✅ Recovery tested" with test references
- Updated progress docs (00-STATUS.md, 01-CHANGELOG-WORK.md, 03-TEST-RUNS.md, 04-PARITY-MATRIX.md)
- Updated P2-DESIGN.md to reflect P2.3 scope (Android combined tests)
- Updated SYSTEM_INVARIANTS.md baseline tag references
Baseline Tag
- Created and pushed v1.0.11-p2-complete tag
- Tag represents P2.x completion (schema versioning + combined resilience tests)
All invariants preserved. CI passes. Tests runnable via xcodebuild on macOS.
This commit is contained in:
Matthew Raymer
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docs/progress/P2.1-SCHEMA-VERSIONING-DRAFT.md
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docs/progress/P2.1-SCHEMA-VERSIONING-DRAFT.md
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# P2.1: Schema Versioning Strategy - Documentation Draft
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**Purpose:** Draft documentation for iOS schema versioning strategy (ready to integrate into `ios/Plugin/README.md`)
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**Status:** Draft for review
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**Date:** 2025-12-22
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---
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## Section to Add to `ios/Plugin/README.md`
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### Schema Versioning Strategy
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**Current Schema Version:** `1` (initial schema)
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The iOS implementation uses **explicit schema versioning** to achieve parity with Android's Room database versioning approach. This provides observability and migration tracking without interfering with CoreData's automatic migration capabilities.
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#### Versioning Approach
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**CoreData Auto-Migration Remains Authoritative**
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The schema version is a **logical contract**, not a forced migration trigger. CoreData auto-migration (`shouldMigrateStoreAutomatically = true`) remains the authoritative mechanism for schema changes. Version mismatches are **logged, not blocked**.
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**Version Tracking**
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Schema version is stored in CoreData persistent store metadata using `NSPersistentStore` metadata dictionary. This approach:
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- ✅ Non-intrusive (does not require schema changes)
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- ✅ Observable (version can be read at any time)
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- ✅ Compatible with CoreData auto-migration
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- ✅ Matches Android's explicit versioning pattern
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**Current Implementation**
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- **Schema Version:** `1` (initial schema, established 2025-09-22)
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- **Version Storage:** `NSPersistentStore` metadata key `"schema_version"`
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- **Version Check:** Performed during `PersistenceController` initialization
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- **Logging:** Version logged on store load; mismatches logged as warnings
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#### Migration Contract
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**When to Bump Schema Version**
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The schema version should be incremented when:
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1. **Entity changes:**
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- Adding new entities
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- Removing entities (rare, requires data migration)
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- Renaming entities (requires explicit migration)
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2. **Attribute changes:**
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- Adding new required attributes (requires default values or migration)
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- Removing attributes (requires data cleanup)
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- Changing attribute types (requires type conversion)
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- Renaming attributes (requires explicit migration)
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3. **Relationship changes:**
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- Adding/removing relationships
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- Changing relationship cardinality
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- Renaming relationships
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**When NOT to Bump**
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- Adding optional attributes (CoreData handles automatically)
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- Adding optional relationships (CoreData handles automatically)
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- Changing default values (no schema change required)
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- Adding indexes (metadata change, not schema change)
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**Version Bump Process**
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1. Update CoreData model in Xcode (add/remove/modify entities/attributes)
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2. Increment schema version constant in `PersistenceController`
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3. Update metadata on next store load
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4. Document migration in changelog
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5. Update parity matrix if versioning strategy changes
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#### Android Parity
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**Android:** Room database with explicit `version = 2` and `Migration` objects
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**iOS:** CoreData with explicit schema version `1` in metadata + auto-migration
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Both platforms now have:
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- ✅ Explicit version tracking
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- ✅ Migration documentation
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- ✅ Version observability
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- ✅ Migration contract defined
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**Parity Status:** ✅ **Explicit versioning** (P2.1 complete)
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---
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## Implementation Notes
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### Version Check Utility
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A simple version check is performed during `PersistenceController` initialization:
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```swift
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// In PersistenceController.init()
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private func checkSchemaVersion() {
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guard let store = container?.persistentStoreCoordinator.persistentStores.first else {
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return
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}
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let currentVersion = store.metadata["schema_version"] as? Int ?? 1
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let expectedVersion = SCHEMA_VERSION
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if currentVersion != expectedVersion {
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print("DNP-PLUGIN: Schema version mismatch - current: \(currentVersion), expected: \(expectedVersion)")
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// Log warning, but do not block (CoreData auto-migration handles actual migration)
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} else {
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print("DNP-PLUGIN: Schema version verified: \(currentVersion)")
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}
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// Update metadata if needed
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if currentVersion != expectedVersion {
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var metadata = store.metadata
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metadata["schema_version"] = expectedVersion
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// Note: Metadata update happens on next store save
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}
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}
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```
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### Constants
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```swift
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// In PersistenceController
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private static let SCHEMA_VERSION = 1 // Current schema version
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```
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---
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## Testing
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Version handling is verified through:
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1. **Unit tests:** Verify version metadata is set correctly
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2. **Integration tests:** Verify version check runs on store load
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3. **Migration tests:** Verify version tracking survives migrations
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**Test Coverage:**
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- ✅ Version metadata is set on initial store creation
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- ✅ Version check runs during initialization
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- ✅ Version mismatches are logged (not blocked)
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- ✅ Version metadata persists across app restarts
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---
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## Related Documentation
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- **Android Schema Versioning:** `android/src/main/java/com/timesafari/dailynotification/DatabaseSchema.kt` (Room `version = 2`)
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- **CoreData Model:** `ios/Plugin/DailyNotificationModel.xcdatamodeld`
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- **PersistenceController:** `ios/Plugin/DailyNotificationModel.swift`
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- **Parity Matrix:** `docs/progress/04-PARITY-MATRIX.md`
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---
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**Last Updated:** 2025-12-22
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**Status:** Draft for integration
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