| SQLite archive | Archive v2 schema, snapshot-level observation grouping, differential write path, v2 verification/delete bookkeeping, daily aggregate rebuilds, integrity report, v2 record reads, SQL diff/count/aggregate/provenance/consolidation-evidence APIs, large synthetic diff pagination coverage, formal timing/memory metrics, and XCTest coverage are in place; the legacy `archive_samples` mirror has been removed | Move Snapshots/Data Types from SwiftData previews to archive/cache DTOs |

 | Core Data cache | Initial programmatic Core Data model, full-cache rebuild service, read DTOs for observation/type/diff/health rows, and Dashboard archive-cache status wiring are in place | Move remaining export/report paths to cache DTOs and add targeted partial invalidation |

 | SwiftData cache | Exists; test builds now reset legacy prototype UI/archive/cache stores once for archive v2 so old SwiftData-only snapshots are not treated as backed-up observations. Metric timeout calibration, local device profile settings, operation logging, ContentView preview, Settings data maintenance, and legacy anomaly/count-drop review have moved outside SwiftData or been removed. Remaining SwiftData imports are inventoried in [`SwiftData-Retirement-Inventory.md`](SwiftData-Retirement-Inventory.md) | Treat as disposable prototype data; replace capture review actions and navigation handles before removing `ModelContainer` |

 | Diff/change explanation | SQL diff summaries, paged diff records, aggregate comparisons, and consolidation-evidence labels exist; legacy anomaly/count-drop review has been removed from active flows | Continue moving remaining SwiftData fallback detail paths to archive/cache DTOs |

 | Export | SQLite export preview, paged JSON writing, SHA256 manifest hashing, and `export_manifests` rows are in place for selected records and observation diffs | Fill remaining recovery-compatible envelope metadata, CSV export, relationship preservation, and reproducibility checks |

 | Legacy device support | Simplified detail UI mode is implemented for small/accessibility layouts and as a Settings toggle | Remove SwiftData dependency and validate lower deployment targets |

 Checklist:

 - [ ] Replace direct SwiftData `@Query` dependencies for target screens.

 - [x] Observation timeline rows read Core Data cache when available, while retaining SwiftData handles for detail navigation during transition.

 - [x] Observation detail uses cached summary/type rows plus SQLite diff summaries when archive observation ids exist.

 - [x] Data Types list rows prefer Core Data cached counts plus SQLite `diffSummary` when archive observation ids exist.

 - `HealthProbe/Views/Settings/SettingsView.swift` no longer imports SwiftData.

   Its Data section now reports/rebuilds/deletes the rebuildable Core Data UI

   cache and leaves the SQLite archive untouched.

 - `HealthProbe/Models/AnomalyRecord.swift`,

   `HealthProbe/Models/AnomalyType.swift`, and

   `HealthProbe/Services/AnomalyDetector.swift` were deleted. The app no longer

     var archiveCacheError: String?

     private let healthKit = HealthKitService.shared

     private var pendingPartialSnapshot: HealthSnapshot?

     private var pendingAmbiguousSnapshot: HealthSnapshot?

         snapshotProgress = .idle

     }

     func loadArchiveCacheStatus() {

         do {

             let cache = try CoreDataArchiveCacheStore()

 struct DashboardView: View {

     @Environment(\.modelContext) private var modelContext

     @Environment(AppSettings.self) private var appSettings

     @State private var viewModel = DashboardViewModel()

     @State private var currentDeviceProfile = LocalDeviceProfileStore.profile(for: AppSettings.currentDeviceID)

     @State private var didAutoRequestPermissions = false

     @State private var idleTimerWasDisabledBeforeSnapshot = false

     @State private var snapshotIdleTimerOverrideActive = false

     private var latestArchiveObservation: CachedArchiveObservationRow? {

         viewModel.latestArchiveObservation

     }

     }

     private var currentDeviceDisplayName: String {

         if !currentDeviceProfile.name.isEmpty { return currentDeviceProfile.name }

         return "Local device"

     }

     private var latestArchiveChangeCount: Int? {

         guard let latestArchiveObservation,

               previousArchiveObservation != nil else {

                     Text("\(latestArchiveObservation.trackedTypeCount)")

                         .foregroundStyle(.secondary)

                 }

             } else {

                     .foregroundStyle(.secondary)

             }

                 InfoRow(label: "Device") {

                     Text(currentDeviceDisplayName)

                         .foregroundStyle(.secondary)

                     Text(archiveDelta == 0 ? "None" : "\(archiveDelta) records")

                         .foregroundStyle(archiveDelta == 0 ? Color.healthyGreen : Color.warningAmber)

                 }

             }

         }

     }

 #Preview {

     DashboardView()

         .environment(AppSettings())

 }