refactor(storage): remove SwiftData legacy import

AGENTS.md

@@ -176,7 +176,7 @@ Test with:
 
 - **UI**: SwiftUI, UIKit, and AppKit are all acceptable. Choose the most maintainable and platform-appropriate approach per feature.
 - **State**: `@Observable` pattern (not `ObservableObject`)
-- **Persistence**: SwiftData for profiles/libraries/fonts/series/books/collections/read lists/dashboard caches, UserDefaults via `AppConfig`
+- **Persistence**: GRDB for profiles/libraries/fonts/series/books/collections/read lists/dashboard caches, UserDefaults via `AppConfig`
 - **Networking**: Centralized `APIClient` with feature-specific services
 - **Real-time**: Server-Sent Events (SSE) via `SSEService`
 - **Error Handling**: Route all user-visible errors through `ErrorManager.shared` (Core/Storage/Errors/)
@@ -186,7 +186,7 @@ Test with:
 
 ```
 KMReader/
-├── MainApp.swift              # Entry point, SwiftData setup, environment injection
+├── MainApp.swift              # Entry point, GRDB setup, environment injection
 ├── ContentView.swift          # Main navigation, login/tab switching
 ├── MainSplitView.swift        # Split view shell for macOS/iPad
 ├── PhoneTabView.swift         # iPhone tab shell (iOS 18+)
@@ -295,7 +295,7 @@ KMReader/
 
 **App Lifecycle**
 
-- `MainApp.swift`: Loads SwiftData schema, configures stores, registers iOS AppDelegate for background downloads
+- `MainApp.swift`: Opens and migrates the GRDB store, configures stores, registers iOS AppDelegate for background downloads
 - `ContentView.swift`: Chooses onboarding (`LandingView`) or authenticated shells
   - macOS and iPad: `MainSplitView`
   - iPhone: `PhoneTabView` (iOS 18+) or `OldTabView`
@@ -309,7 +309,7 @@ KMReader/
 
 **State & Persistence**
 
-- **SwiftData**: `KomgaInstance`, `KomgaLibrary`, `KomgaSeries`, `KomgaBook`, `KomgaCollection`, `KomgaReadList`, `CustomFont`, `PendingProgress` with dedicated stores
+- **GRDB**: `KomgaInstance`, `KomgaLibrary`, `KomgaSeries`, `KomgaBook`, `KomgaCollection`, `KomgaReadList`, `CustomFont`, `PendingProgress` with dedicated stores
 - **AppConfig**: Centralizes UserDefaults (server URL, tokens, SSE toggles, reader preferences, cache budgets, API timeout/retry settings)
 - **Caches**: Multi-tier caching scoped per Komga instance via `CacheNamespace` (managed by `CacheManager`)
 - Use `@AppStorage` in views, `AppConfig` elsewhere
@@ -320,7 +320,7 @@ KMReader/
 - `APIClient.swift`: Authenticated requests, JSON decoding, OSLog logging, configurable timeout and retry
 - Feature services mirror `openapi.json` endpoints with pagination/filtering
 - Services organized by domain: `AuthService`, `BookService`, `SeriesService`, `LibraryService`, etc.
-- Authentication: `AuthService` + SwiftData `KomgaInstance` stores + `AppConfig`
+- Authentication: `AuthService` + GRDB `KomgaInstance` stores + `AppConfig`
 
 **Real-time Updates**
 
@@ -343,7 +343,7 @@ KMReader/
 
 **Sync & Initialization**
 
-- `SyncService`: Syncs data between server and local SwiftData
+- `SyncService`: Syncs data between server and local GRDB storage
 - `ProgressSyncService`: Syncs read progress to server
 - `SyncViewModel`: Exposes synchronization state to SwiftUI and delegates work to `SyncWorker`
 - `SyncWorker`: Runs synchronization, pagination, reconciliation, and persistence off the main actor
@@ -376,7 +376,7 @@ Additional patterns:
 - Pass shared object dependencies explicitly at split/tab roots, `NavigationStack` roots, sheets, full-screen covers, scene boundaries, and any `UIHostingController`/`NSHostingController` boundary; do not assume outer environment inheritance is stable during snapshot, rotation, or scene transitions
 - For architecture-level bugs, prefer replacing the confused layer instead of adding compensating state around it. Small patches are acceptable only when the underlying ownership model is already sound.
 - SSE callbacks are single-assignment closures; implement dispatchers if multiple components need the same event
-- Clearing caches/server data must go through `CacheManager` and SwiftData stores
+- Clearing caches/server data must go through `CacheManager` and GRDB stores
 - New API endpoints belong in appropriate service; keep request-building out of views
 - Dashboard/library selections stored via `LibraryManager` and related managers
 - All logging goes through `AppLogger` with OSLog subsystems and categories

KMReader.xcodeproj/project.pbxproj

@@ -442,7 +442,7 @@
 				"CODE_SIGN_ENTITLEMENTS[sdk=macosx*]" = "KMReader/KMReader-macOS.entitlements";
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 499;
+				CURRENT_PROJECT_VERSION = 500;
 				DEVELOPMENT_TEAM = M777UHWZA4;
 				ENABLE_APP_SANDBOX = YES;
 				ENABLE_HARDENED_RUNTIME = YES;
@@ -468,7 +468,7 @@
 					"@executable_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 14;
-				MARKETING_VERSION = 5.3;
+				MARKETING_VERSION = 6.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.everpcpc.Komga;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
@@ -500,7 +500,7 @@
 				"CODE_SIGN_ENTITLEMENTS[sdk=macosx*]" = "KMReader/KMReader-macOS.entitlements";
 				CODE_SIGN_IDENTITY = "Apple Distribution";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 499;
+				CURRENT_PROJECT_VERSION = 500;
 				DEVELOPMENT_TEAM = "";
 				"DEVELOPMENT_TEAM[sdk=appletvos*]" = M777UHWZA4;
 				"DEVELOPMENT_TEAM[sdk=iphoneos*]" = M777UHWZA4;
@@ -529,7 +529,7 @@
 					"@executable_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 14;
-				MARKETING_VERSION = 5.3;
+				MARKETING_VERSION = 6.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.everpcpc.Komga;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
@@ -560,7 +560,7 @@
 				CODE_SIGN_ENTITLEMENTS = KMReaderWidgets/KMReaderWidgets.entitlements;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 499;
+				CURRENT_PROJECT_VERSION = 500;
 				DEVELOPMENT_TEAM = M777UHWZA4;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = KMReaderWidgets/Info.plist;
@@ -572,7 +572,7 @@
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 5.3;
+				MARKETING_VERSION = 6.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.everpcpc.Komga.KMReaderWidgets;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -594,7 +594,7 @@
 				CODE_SIGN_IDENTITY = "Apple Distribution";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Distribution";
 				CODE_SIGN_STYLE = Manual;
-				CURRENT_PROJECT_VERSION = 499;
+				CURRENT_PROJECT_VERSION = 500;
 				DEVELOPMENT_TEAM = "";
 				"DEVELOPMENT_TEAM[sdk=iphoneos*]" = M777UHWZA4;
 				GENERATE_INFOPLIST_FILE = YES;
@@ -607,7 +607,7 @@
 					"@executable_path/Frameworks",
 					"@executable_path/../../Frameworks",
 				);
-				MARKETING_VERSION = 5.3;
+				MARKETING_VERSION = 6.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.everpcpc.Komga.KMReaderWidgets;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";

KMReader/Core/Storage/GRDB/LocalDatabase.swift

@@ -6,45 +6,8 @@
 import Foundation
 import GRDB
 
-enum LegacyImportMarkerState: String, Codable, Sendable {
-  case missing
-  case completed
-  case failed
-}
-
-nonisolated struct LocalMigrationMarker: Codable, Sendable {
-  static let databaseTableName = "local_migration_markers"
-
-  var key: String
-  var state: LegacyImportMarkerState
-  var message: String?
-  var updatedAt: Date
-
-  init(
-    key: String,
-    state: LegacyImportMarkerState,
-    message: String? = nil,
-    updatedAt: Date = Date()
-  ) {
-    self.key = key
-    self.state = state
-    self.message = message
-    self.updatedAt = updatedAt
-  }
-
-  enum CodingKeys: String, CodingKey {
-    case key
-    case state
-    case message
-    case updatedAt = "updated_at"
-  }
-}
-
-nonisolated extension LocalMigrationMarker: FetchableRecord, MutablePersistableRecord {}
-
 nonisolated enum LocalDatabase {
   static let fileName = "KMReader.sqlite"
-  static let legacyImportMarkerKey = "swiftdata_v6_import"
 
   static func open() throws -> DatabaseQueue {
     let url = try databaseURL()
@@ -100,6 +63,10 @@ nonisolated enum LocalDatabase {
       }
     }
 
+    migrator.registerMigration("00006_drop_migration_markers") { db in
+      try db.execute(sql: "DROP TABLE IF EXISTS local_migration_markers")
+    }
+
     try migrator.migrate(writer)
   }
 
@@ -108,18 +75,8 @@ nonisolated enum LocalDatabase {
     return supportDirectory.appendingPathComponent(fileName)
   }
 
-  static func legacyStoreCandidates(fileManager: FileManager = .default) -> [URL] {
-    var storeDirectories = AppStorageDirectory.supportDirectoryCandidates(fileManager: fileManager)
-
-    if let sharedContainer = WidgetDataStore.sharedContainerURL {
-      storeDirectories.append(sharedContainer.appendingPathComponent("Library/Application Support", isDirectory: true))
-    }
-
-    return storeDirectories.map { $0.appendingPathComponent("default.store") }
-  }
-
   private static nonisolated func createMarkerTable(_ db: Database) throws {
-    try db.create(table: LocalMigrationMarker.databaseTableName, ifNotExists: true) { table in
+    try db.create(table: "local_migration_markers", ifNotExists: true) { table in
       table.column("key", .text).primaryKey()
       table.column("state", .text).notNull()
       table.column("message", .text)