Add StadiumAlias CloudKit sync and offline-first data architecture

- Add CKStadiumAlias model for CloudKit record mapping
- Add fetchStadiumAliases/fetchStadiumAliasChanges to CloudKitService
- Add syncStadiumAliases to CanonicalSyncService for delta sync
- Add subscribeToStadiumAliasUpdates for push notifications
- Update cloudkit_import.py with --stadium-aliases-only option

Data Architecture Updates:
- Remove obsolete provider files (CanonicalDataProvider, CloudKitDataProvider, StubDataProvider)
- AppDataProvider now reads exclusively from SwiftData
- Add background CloudKit sync on app startup (non-blocking)
- Document data architecture in CLAUDE.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -50,11 +50,75 @@ This is an iOS app for planning multi-stop sports road trips. It uses **Clean MV
    - `Services/POISearchService` - Finds nearby restaurants, attractions via MKLocalSearch
    - `Services/PDFAssetPrefetcher` - Parallel prefetching of all PDF assets
 
-### Data Storage Strategy
+### Data Architecture (Offline-First)
 
-- **CloudKit Public DB**: Read-only schedules, stadiums, teams (shared across all users)
-- **SwiftData Local**: User's saved trips, preferences, cached schedules
-- **No network dependency** for trip planning once schedules are synced
+**CRITICAL: `AppDataProvider.shared` is the ONLY source of truth for canonical data.**
+
+All code that reads stadiums, teams, games, or league structure MUST use `AppDataProvider.shared`. Never access CloudKit or SwiftData directly for this data.
+
+```
+┌──────────────────┐     ┌──────────────────┐     ┌──────────────────┐
+│  Bundled JSON    │     │    SwiftData     │     │    CloudKit      │
+│  (App Bundle)    │     │  (Local Store)   │     │  (Remote Sync)   │
+└────────┬─────────┘     └────────▲─────────┘     └────────┬─────────┘
+         │                        │                        │
+         │ Bootstrap              │ Read                   │ Background
+         │ (first launch)        │                        │ Sync
+         ▼                        │                        ▼
+┌─────────────────────────────────┴────────────────────────────────────┐
+│                        AppDataProvider.shared                         │
+│                     (Single Source of Truth)                          │
+└─────────────────────────────────┬────────────────────────────────────┘
+                                  │
+                                  ▼
+                    All Features, ViewModels, Services
+```
+
+**App Startup Flow:**
+1. **Bootstrap** (first launch only): `BootstrapService` loads bundled JSON → SwiftData
+2. **Configure**: `AppDataProvider.shared.configure(with: context)`
+3. **Load**: `AppDataProvider.shared.loadInitialData()` reads SwiftData into memory
+4. **App usable immediately** with local data
+5. **Background sync**: `CanonicalSyncService.syncAll()` fetches CloudKit → updates SwiftData (non-blocking)
+6. **Reload**: After sync completes, `loadInitialData()` refreshes in-memory cache
+
+**Offline Handling:**
+- SwiftData always has data (from bootstrap or last successful CloudKit sync)
+- If CloudKit unavailable, app continues with existing local data
+- First launch + offline = bootstrap data used
+
+**Canonical Data Models** (in SwiftData, synced from CloudKit):
+- `CanonicalStadium` → `Stadium` (domain)
+- `CanonicalTeam` → `Team` (domain)
+- `CanonicalGame` → `Game` (domain)
+- `LeagueStructureModel`
+- `TeamAlias`, `StadiumAlias`
+
+**User Data Models** (local only, not synced):
+- `SavedTrip`, `StadiumVisit`, `UserPreferences`, `Achievement`
+
+**Correct Usage:**
+```swift
+// ✅ CORRECT - Use AppDataProvider
+let stadiums = AppDataProvider.shared.stadiums
+let teams = AppDataProvider.shared.teams
+let games = try await AppDataProvider.shared.fetchGames(sports: sports, startDate: start, endDate: end)
+let richGames = try await AppDataProvider.shared.fetchRichGames(...)
+
+// ❌ WRONG - Never access CloudKit directly for reads
+let stadiums = try await CloudKitService.shared.fetchStadiums() // NO!
+
+// ❌ WRONG - Never fetch canonical data from SwiftData directly
+let descriptor = FetchDescriptor<CanonicalStadium>()
+let stadiums = try context.fetch(descriptor) // NO! (except in DataProvider/Sync/Bootstrap)
+```
+
+**Allowed Direct SwiftData Access:**
+- `DataProvider.swift` - It IS the data provider
+- `CanonicalSyncService.swift` - CloudKit → SwiftData sync
+- `BootstrapService.swift` - Initial data population
+- `StadiumIdentityService.swift` - Specialized identity resolution for stadium renames
+- User data (e.g., `StadiumVisit`) - Not canonical data
 
 ### Key Data Flow
 

Scripts/cloudkit_import.py

@@ -14,6 +14,7 @@ Usage:
   python cloudkit_import.py --key-id XX --key-file key.p8  # Import all
   python cloudkit_import.py --stadiums-only ...          # Stadiums first
   python cloudkit_import.py --games-only ...             # Games after
+  python cloudkit_import.py --stadium-aliases-only ...   # Stadium aliases only
   python cloudkit_import.py --delete-all ...             # Delete then import
   python cloudkit_import.py --delete-only ...            # Delete only (no import)
 """
@@ -44,26 +45,27 @@ def show_menu():
     print("\n" + "="*50)
     print("CloudKit Import - Select Action")
     print("="*50)
-    print("\n  1. Import all (stadiums, teams, games, league structure, team aliases)")
+    print("\n  1. Import all (stadiums, teams, games, league structure, team aliases, stadium aliases)")
     print("  2. Stadiums only")
     print("  3. Games only")
     print("  4. League structure only")
     print("  5. Team aliases only")
-    print("  6. Canonical only (league structure + team aliases)")
-    print("  7. Delete all then import")
-    print("  8. Delete only (no import)")
-    print("  9. Dry run (preview only)")
+    print("  6. Stadium aliases only")
+    print("  7. Canonical only (league structure + team aliases + stadium aliases)")
+    print("  8. Delete all then import")
+    print("  9. Delete only (no import)")
+    print("  10. Dry run (preview only)")
     print("  0. Exit")
     print()
 
     while True:
         try:
-            choice = input("Enter choice [1-9, 0 to exit]: ").strip()
+            choice = input("Enter choice [1-10, 0 to exit]: ").strip()
             if choice == '0':
                 return None
-            if choice in ['1', '2', '3', '4', '5', '6', '7', '8', '9']:
+            if choice in ['1', '2', '3', '4', '5', '6', '7', '8', '9', '10']:
                 return int(choice)
-            print("Invalid choice. Please enter 1-9 or 0.")
+            print("Invalid choice. Please enter 1-10 or 0.")
         except (EOFError, KeyboardInterrupt):
             print("\nExiting.")
             return None
@@ -257,7 +259,8 @@ def main():
     p.add_argument('--games-only', action='store_true')
     p.add_argument('--league-structure-only', action='store_true', help='Import only league structure')
     p.add_argument('--team-aliases-only', action='store_true', help='Import only team aliases')
-    p.add_argument('--canonical-only', action='store_true', help='Import only canonical data (league structure + team aliases)')
+    p.add_argument('--stadium-aliases-only', action='store_true', help='Import only stadium aliases')
+    p.add_argument('--canonical-only', action='store_true', help='Import only canonical data (league structure + team aliases + stadium aliases)')
     p.add_argument('--delete-all', action='store_true', help='Delete all records before importing')
     p.add_argument('--delete-only', action='store_true', help='Only delete records, do not import')
     p.add_argument('--dry-run', action='store_true')
@@ -268,8 +271,8 @@ def main():
     # Show interactive menu if no action flags provided or --interactive
     has_action_flag = any([
         args.stadiums_only, args.games_only, args.league_structure_only,
-        args.team_aliases_only, args.canonical_only, args.delete_all,
-        args.delete_only, args.dry_run
+        args.team_aliases_only, args.stadium_aliases_only, args.canonical_only,
+        args.delete_all, args.delete_only, args.dry_run
     ])
 
     if args.interactive or not has_action_flag:
@@ -288,13 +291,15 @@ def main():
             args.league_structure_only = True
         elif choice == 5:  # Team aliases only
             args.team_aliases_only = True
-        elif choice == 6:  # Canonical only
+        elif choice == 6:  # Stadium aliases only
+            args.stadium_aliases_only = True
+        elif choice == 7:  # Canonical only
             args.canonical_only = True
-        elif choice == 7:  # Delete all then import
+        elif choice == 8:  # Delete all then import
             args.delete_all = True
-        elif choice == 8:  # Delete only
+        elif choice == 9:  # Delete only
             args.delete_only = True
-        elif choice == 9:  # Dry run
+        elif choice == 10:  # Dry run
             args.dry_run = True
 
     print(f"\n{'='*50}")
@@ -308,7 +313,8 @@ def main():
     games = json.load(open(data_dir / 'games.json')) if (data_dir / 'games.json').exists() else []
     league_structure = json.load(open(data_dir / 'league_structure.json')) if (data_dir / 'league_structure.json').exists() else []
     team_aliases = json.load(open(data_dir / 'team_aliases.json')) if (data_dir / 'team_aliases.json').exists() else []
-    print(f"Loaded {len(stadiums)} stadiums, {len(games)} games, {len(league_structure)} league structures, {len(team_aliases)} team aliases\n")
+    stadium_aliases = json.load(open(data_dir / 'stadium_aliases.json')) if (data_dir / 'stadium_aliases.json').exists() else []
+    print(f"Loaded {len(stadiums)} stadiums, {len(games)} games, {len(league_structure)} league structures, {len(team_aliases)} team aliases, {len(stadium_aliases)} stadium aliases\n")
 
     ck = None
     if not args.dry_run:
@@ -325,7 +331,7 @@ def main():
 
         print("--- Deleting Existing Records ---")
         # Delete in order: dependent records first, then base records
-        for record_type in ['Game', 'TeamAlias', 'Team', 'LeagueStructure', 'Stadium']:
+        for record_type in ['Game', 'TeamAlias', 'StadiumAlias', 'Team', 'LeagueStructure', 'Stadium']:
             print(f"  Deleting {record_type} records...")
             deleted = ck.delete_all(record_type, verbose=args.verbose)
             print(f"  Deleted {deleted} {record_type} records")
@@ -336,15 +342,16 @@ def main():
             print()
             return
 
-    stats = {'stadiums': 0, 'teams': 0, 'games': 0, 'league_structures': 0, 'team_aliases': 0}
+    stats = {'stadiums': 0, 'teams': 0, 'games': 0, 'league_structures': 0, 'team_aliases': 0, 'stadium_aliases': 0}
     team_map = {}
 
     # Determine what to import based on flags
-    import_stadiums = not args.games_only and not args.league_structure_only and not args.team_aliases_only and not args.canonical_only
-    import_teams = not args.games_only and not args.league_structure_only and not args.team_aliases_only and not args.canonical_only
-    import_games = not args.stadiums_only and not args.league_structure_only and not args.team_aliases_only and not args.canonical_only
-    import_league_structure = args.league_structure_only or args.canonical_only or (not args.stadiums_only and not args.games_only and not args.team_aliases_only)
-    import_team_aliases = args.team_aliases_only or args.canonical_only or (not args.stadiums_only and not args.games_only and not args.league_structure_only)
+    import_stadiums = not args.games_only and not args.league_structure_only and not args.team_aliases_only and not args.stadium_aliases_only and not args.canonical_only
+    import_teams = not args.games_only and not args.league_structure_only and not args.team_aliases_only and not args.stadium_aliases_only and not args.canonical_only
+    import_games = not args.stadiums_only and not args.league_structure_only and not args.team_aliases_only and not args.stadium_aliases_only and not args.canonical_only
+    import_league_structure = args.league_structure_only or args.canonical_only or (not args.stadiums_only and not args.games_only and not args.team_aliases_only and not args.stadium_aliases_only)
+    import_team_aliases = args.team_aliases_only or args.canonical_only or (not args.stadiums_only and not args.games_only and not args.league_structure_only and not args.stadium_aliases_only)
+    import_stadium_aliases = args.stadium_aliases_only or args.canonical_only or (not args.stadiums_only and not args.games_only and not args.league_structure_only and not args.team_aliases_only)
 
     # Build stadium UUID lookup (stadium string ID -> UUID)
     stadium_uuid_map = {s['id']: deterministic_uuid(s['id']) for s in stadiums}
@@ -522,8 +529,40 @@ def main():
             })
         stats['team_aliases'] = import_data(ck, recs, 'team aliases', args.dry_run, args.verbose)
 
+    # Import stadium aliases
+    if import_stadium_aliases and stadium_aliases:
+        print("--- Stadium Aliases ---")
+        now_ms = int(datetime.now(timezone.utc).timestamp() * 1000)
+        recs = []
+        for sa in stadium_aliases:
+            fields = {
+                'aliasName': {'value': sa['alias_name'].lower()},  # Normalize to lowercase
+                'stadiumCanonicalId': {'value': sa['stadium_canonical_id']},
+                'schemaVersion': {'value': 1},
+                'lastModified': {'value': now_ms, 'type': 'TIMESTAMP'},
+            }
+            # Add optional date fields
+            if sa.get('valid_from'):
+                try:
+                    dt = datetime.strptime(sa['valid_from'], '%Y-%m-%d')
+                    fields['validFrom'] = {'value': int(dt.timestamp() * 1000), 'type': 'TIMESTAMP'}
+                except:
+                    pass
+            if sa.get('valid_until'):
+                try:
+                    dt = datetime.strptime(sa['valid_until'], '%Y-%m-%d')
+                    fields['validUntil'] = {'value': int(dt.timestamp() * 1000), 'type': 'TIMESTAMP'}
+                except:
+                    pass
+            recs.append({
+                'recordType': 'StadiumAlias',
+                'recordName': sa['alias_name'].lower(),  # Use alias_name as recordName (unique key)
+                'fields': fields
+            })
+        stats['stadium_aliases'] = import_data(ck, recs, 'stadium aliases', args.dry_run, args.verbose)
+
     print(f"\n{'='*50}")
-    print(f"COMPLETE: {stats['stadiums']} stadiums, {stats['teams']} teams, {stats['games']} games, {stats['league_structures']} league structures, {stats['team_aliases']} team aliases")
+    print(f"COMPLETE: {stats['stadiums']} stadiums, {stats['teams']} teams, {stats['games']} games, {stats['league_structures']} league structures, {stats['team_aliases']} team aliases, {stats['stadium_aliases']} stadium aliases")
     if args.dry_run:
         print("[DRY RUN - nothing imported]")
     print()

SportsTime.xcodeproj/project.pbxproj

@@ -294,6 +294,7 @@
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = SportsTime/Info.plist;
+				INFOPLIST_KEY_NSPhotoLibraryUsageDescription = "SportsTime uses your photos to import stadium visits by reading GPS location and date from photo metadata.";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
@@ -328,6 +329,7 @@
 				ENABLE_PREVIEWS = YES;
 				GENERATE_INFOPLIST_FILE = YES;
 				INFOPLIST_FILE = SportsTime/Info.plist;
+				INFOPLIST_KEY_NSPhotoLibraryUsageDescription = "SportsTime uses your photos to import stadium visits by reading GPS location and date from photo metadata.";
 				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
 				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
 				INFOPLIST_KEY_UILaunchScreen_Generation = YES;

SportsTime/Core/Models/CloudKit/CKModels.swift

@@ -17,6 +17,7 @@ enum CKRecordType {
     static let sport = "Sport"
     static let leagueStructure = "LeagueStructure"
     static let teamAlias = "TeamAlias"
+    static let stadiumAlias = "StadiumAlias"
 }
 
 // MARK: - CKTeam
@@ -273,6 +274,55 @@ struct CKLeagueStructure {
     }
 }
 
+// MARK: - CKStadiumAlias
+
+struct CKStadiumAlias {
+    static let aliasNameKey = "aliasName"
+    static let stadiumCanonicalIdKey = "stadiumCanonicalId"
+    static let validFromKey = "validFrom"
+    static let validUntilKey = "validUntil"
+    static let schemaVersionKey = "schemaVersion"
+    static let lastModifiedKey = "lastModified"
+
+    let record: CKRecord
+
+    init(record: CKRecord) {
+        self.record = record
+    }
+
+    init(model: StadiumAlias) {
+        let record = CKRecord(recordType: CKRecordType.stadiumAlias, recordID: CKRecord.ID(recordName: model.aliasName))
+        record[CKStadiumAlias.aliasNameKey] = model.aliasName
+        record[CKStadiumAlias.stadiumCanonicalIdKey] = model.stadiumCanonicalId
+        record[CKStadiumAlias.validFromKey] = model.validFrom
+        record[CKStadiumAlias.validUntilKey] = model.validUntil
+        record[CKStadiumAlias.schemaVersionKey] = model.schemaVersion
+        record[CKStadiumAlias.lastModifiedKey] = model.lastModified
+        self.record = record
+    }
+
+    /// Convert to SwiftData model for local storage
+    func toModel() -> StadiumAlias? {
+        guard let aliasName = record[CKStadiumAlias.aliasNameKey] as? String,
+              let stadiumCanonicalId = record[CKStadiumAlias.stadiumCanonicalIdKey] as? String
+        else { return nil }
+
+        let validFrom = record[CKStadiumAlias.validFromKey] as? Date
+        let validUntil = record[CKStadiumAlias.validUntilKey] as? Date
+        let schemaVersion = record[CKStadiumAlias.schemaVersionKey] as? Int ?? SchemaVersion.current
+        let lastModified = record[CKStadiumAlias.lastModifiedKey] as? Date ?? record.modificationDate ?? Date()
+
+        return StadiumAlias(
+            aliasName: aliasName,
+            stadiumCanonicalId: stadiumCanonicalId,
+            validFrom: validFrom,
+            validUntil: validUntil,
+            schemaVersion: schemaVersion,
+            lastModified: lastModified
+        )
+    }
+}
+
 // MARK: - CKTeamAlias
 
 struct CKTeamAlias {

SportsTime/Core/Services/CanonicalDataProvider.swift

@@ -1,234 +0,0 @@
-//
-//  CanonicalDataProvider.swift
-//  SportsTime
-//
-//  DataProvider implementation that reads from SwiftData canonical models.
-//  This is the primary data source after bootstrap completes.
-//
-
-import Foundation
-import SwiftData
-
-actor CanonicalDataProvider: DataProvider {
-
-    // MARK: - Properties
-
-    private let modelContainer: ModelContainer
-
-    // Caches for converted domain objects (rebuilt on first access)
-    private var cachedTeams: [Team]?
-    private var cachedStadiums: [Stadium]?
-    private var teamsByCanonicalId: [String: Team] = [:]
-    private var stadiumsByCanonicalId: [String: Stadium] = [:]
-    private var teamUUIDByCanonicalId: [String: UUID] = [:]
-    private var stadiumUUIDByCanonicalId: [String: UUID] = [:]
-
-    // MARK: - Initialization
-
-    init(modelContainer: ModelContainer) {
-        self.modelContainer = modelContainer
-    }
-
-    // MARK: - DataProvider Protocol
-
-    func fetchTeams(for sport: Sport) async throws -> [Team] {
-        try await loadCachesIfNeeded()
-        return cachedTeams?.filter { $0.sport == sport } ?? []
-    }
-
-    func fetchAllTeams() async throws -> [Team] {
-        try await loadCachesIfNeeded()
-        return cachedTeams ?? []
-    }
-
-    func fetchStadiums() async throws -> [Stadium] {
-        try await loadCachesIfNeeded()
-        return cachedStadiums ?? []
-    }
-
-    func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game] {
-        try await loadCachesIfNeeded()
-
-        let context = ModelContext(modelContainer)
-
-        // Fetch canonical games within date range
-        let sportStrings = sports.map { $0.rawValue }
-        let descriptor = FetchDescriptor<CanonicalGame>(
-            predicate: #Predicate<CanonicalGame> { game in
-                sportStrings.contains(game.sport) &&
-                game.dateTime >= startDate &&
-                game.dateTime <= endDate &&
-                game.deprecatedAt == nil
-            },
-            sortBy: [SortDescriptor(\.dateTime)]
-        )
-
-        let canonicalGames = try context.fetch(descriptor)
-
-        // Convert to domain models
-        return canonicalGames.compactMap { canonical -> Game? in
-            guard let homeTeamUUID = teamUUIDByCanonicalId[canonical.homeTeamCanonicalId],
-                  let awayTeamUUID = teamUUIDByCanonicalId[canonical.awayTeamCanonicalId],
-                  let stadiumUUID = stadiumUUIDByCanonicalId[canonical.stadiumCanonicalId] else {
-                return nil
-            }
-
-            return Game(
-                id: canonical.uuid,
-                homeTeamId: homeTeamUUID,
-                awayTeamId: awayTeamUUID,
-                stadiumId: stadiumUUID,
-                dateTime: canonical.dateTime,
-                sport: canonical.sportEnum ?? .mlb,
-                season: canonical.season,
-                isPlayoff: canonical.isPlayoff,
-                broadcastInfo: canonical.broadcastInfo
-            )
-        }
-    }
-
-    func fetchGame(by id: UUID) async throws -> Game? {
-        try await loadCachesIfNeeded()
-
-        let context = ModelContext(modelContainer)
-
-        // Search by UUID
-        let descriptor = FetchDescriptor<CanonicalGame>(
-            predicate: #Predicate<CanonicalGame> { game in
-                game.uuid == id && game.deprecatedAt == nil
-            }
-        )
-
-        guard let canonical = try context.fetch(descriptor).first else {
-            return nil
-        }
-
-        guard let homeTeamUUID = teamUUIDByCanonicalId[canonical.homeTeamCanonicalId],
-              let awayTeamUUID = teamUUIDByCanonicalId[canonical.awayTeamCanonicalId],
-              let stadiumUUID = stadiumUUIDByCanonicalId[canonical.stadiumCanonicalId] else {
-            return nil
-        }
-
-        return Game(
-            id: canonical.uuid,
-            homeTeamId: homeTeamUUID,
-            awayTeamId: awayTeamUUID,
-            stadiumId: stadiumUUID,
-            dateTime: canonical.dateTime,
-            sport: canonical.sportEnum ?? .mlb,
-            season: canonical.season,
-            isPlayoff: canonical.isPlayoff,
-            broadcastInfo: canonical.broadcastInfo
-        )
-    }
-
-    func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame] {
-        try await loadCachesIfNeeded()
-
-        let games = try await fetchGames(sports: sports, startDate: startDate, endDate: endDate)
-        let teamsById = Dictionary(uniqueKeysWithValues: (cachedTeams ?? []).map { ($0.id, $0) })
-        let stadiumsById = Dictionary(uniqueKeysWithValues: (cachedStadiums ?? []).map { ($0.id, $0) })
-
-        return games.compactMap { game in
-            guard let homeTeam = teamsById[game.homeTeamId],
-                  let awayTeam = teamsById[game.awayTeamId],
-                  let stadium = stadiumsById[game.stadiumId] else {
-                return nil
-            }
-            return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
-        }
-    }
-
-    // MARK: - Additional Queries
-
-    /// Fetch stadium by canonical ID (useful for visit tracking)
-    func fetchStadium(byCanonicalId canonicalId: String) async throws -> Stadium? {
-        try await loadCachesIfNeeded()
-        return stadiumsByCanonicalId[canonicalId]
-    }
-
-    /// Fetch team by canonical ID
-    func fetchTeam(byCanonicalId canonicalId: String) async throws -> Team? {
-        try await loadCachesIfNeeded()
-        return teamsByCanonicalId[canonicalId]
-    }
-
-    /// Find stadium by name (matches aliases)
-    func findStadium(byName name: String) async throws -> Stadium? {
-        let context = ModelContext(modelContainer)
-
-        // Precompute lowercased name outside the predicate
-        let lowercasedName = name.lowercased()
-
-        // First try exact alias match
-        let aliasDescriptor = FetchDescriptor<StadiumAlias>(
-            predicate: #Predicate<StadiumAlias> { alias in
-                alias.aliasName == lowercasedName
-            }
-        )
-
-        if let alias = try context.fetch(aliasDescriptor).first,
-           let stadiumCanonicalId = Optional(alias.stadiumCanonicalId) {
-            return try await fetchStadium(byCanonicalId: stadiumCanonicalId)
-        }
-
-        return nil
-    }
-
-    /// Invalidate caches (call after sync completes)
-    func invalidateCaches() {
-        cachedTeams = nil
-        cachedStadiums = nil
-        teamsByCanonicalId.removeAll()
-        stadiumsByCanonicalId.removeAll()
-        teamUUIDByCanonicalId.removeAll()
-        stadiumUUIDByCanonicalId.removeAll()
-    }
-
-    // MARK: - Private Helpers
-
-    private func loadCachesIfNeeded() async throws {
-        guard cachedTeams == nil else { return }
-
-        let context = ModelContext(modelContainer)
-
-        // Load stadiums
-        let stadiumDescriptor = FetchDescriptor<CanonicalStadium>(
-            predicate: #Predicate<CanonicalStadium> { stadium in
-                stadium.deprecatedAt == nil
-            }
-        )
-        let canonicalStadiums = try context.fetch(stadiumDescriptor)
-
-        cachedStadiums = canonicalStadiums.map { canonical in
-            let stadium = canonical.toDomain()
-            stadiumsByCanonicalId[canonical.canonicalId] = stadium
-            stadiumUUIDByCanonicalId[canonical.canonicalId] = stadium.id
-            return stadium
-        }
-
-        // Load teams
-        let teamDescriptor = FetchDescriptor<CanonicalTeam>(
-            predicate: #Predicate<CanonicalTeam> { team in
-                team.deprecatedAt == nil
-            }
-        )
-        let canonicalTeams = try context.fetch(teamDescriptor)
-
-        cachedTeams = canonicalTeams.compactMap { canonical -> Team? in
-            guard let stadiumUUID = stadiumUUIDByCanonicalId[canonical.stadiumCanonicalId] else {
-                // Generate a placeholder UUID for teams without known stadiums
-                let placeholderUUID = CanonicalStadium.deterministicUUID(from: canonical.stadiumCanonicalId)
-                let team = canonical.toDomain(stadiumUUID: placeholderUUID)
-                teamsByCanonicalId[canonical.canonicalId] = team
-                teamUUIDByCanonicalId[canonical.canonicalId] = team.id
-                return team
-            }
-
-            let team = canonical.toDomain(stadiumUUID: stadiumUUID)
-            teamsByCanonicalId[canonical.canonicalId] = team
-            teamUUIDByCanonicalId[canonical.canonicalId] = team.id
-            return team
-        }
-    }
-}

SportsTime/Core/Services/CanonicalSyncService.swift

@@ -42,12 +42,13 @@ actor CanonicalSyncService {
         let gamesUpdated: Int
         let leagueStructuresUpdated: Int
         let teamAliasesUpdated: Int
+        let stadiumAliasesUpdated: Int
         let skippedIncompatible: Int
         let skippedOlder: Int
         let duration: TimeInterval
 
         var totalUpdated: Int {
-            stadiumsUpdated + teamsUpdated + gamesUpdated + leagueStructuresUpdated + teamAliasesUpdated
+            stadiumsUpdated + teamsUpdated + gamesUpdated + leagueStructuresUpdated + teamAliasesUpdated + stadiumAliasesUpdated
         }
 
         var isEmpty: Bool { totalUpdated == 0 }
@@ -81,7 +82,7 @@ actor CanonicalSyncService {
         guard syncState.syncEnabled else {
             return SyncResult(
                 stadiumsUpdated: 0, teamsUpdated: 0, gamesUpdated: 0,
-                leagueStructuresUpdated: 0, teamAliasesUpdated: 0,
+                leagueStructuresUpdated: 0, teamAliasesUpdated: 0, stadiumAliasesUpdated: 0,
                 skippedIncompatible: 0, skippedOlder: 0,
                 duration: 0
             )
@@ -101,6 +102,7 @@ actor CanonicalSyncService {
         var totalGames = 0
         var totalLeagueStructures = 0
         var totalTeamAliases = 0
+        var totalStadiumAliases = 0
         var totalSkippedIncompatible = 0
         var totalSkippedOlder = 0
 
@@ -138,13 +140,21 @@ actor CanonicalSyncService {
             totalSkippedIncompatible += skipIncompat4
             totalSkippedOlder += skipOlder4
 
-            let (games, skipIncompat5, skipOlder5) = try await syncGames(
+            let (stadiumAliases, skipIncompat5, skipOlder5) = try await syncStadiumAliases(
+                context: context,
+                since: syncState.lastSuccessfulSync
+            )
+            totalStadiumAliases = stadiumAliases
+            totalSkippedIncompatible += skipIncompat5
+            totalSkippedOlder += skipOlder5
+
+            let (games, skipIncompat6, skipOlder6) = try await syncGames(
                 context: context,
                 since: syncState.lastSuccessfulSync
             )
             totalGames = games
-            totalSkippedIncompatible += skipIncompat5
-            totalSkippedOlder += skipOlder5
+            totalSkippedIncompatible += skipIncompat6
+            totalSkippedOlder += skipOlder6
 
             // Mark sync successful
             syncState.syncInProgress = false
@@ -176,6 +186,7 @@ actor CanonicalSyncService {
             gamesUpdated: totalGames,
             leagueStructuresUpdated: totalLeagueStructures,
             teamAliasesUpdated: totalTeamAliases,
+            stadiumAliasesUpdated: totalStadiumAliases,
             skippedIncompatible: totalSkippedIncompatible,
             skippedOlder: totalSkippedOlder,
             duration: Date().timeIntervalSince(startTime)
@@ -346,6 +357,30 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
+    @MainActor
+    private func syncStadiumAliases(
+        context: ModelContext,
+        since lastSync: Date?
+    ) async throws -> (updated: Int, skippedIncompatible: Int, skippedOlder: Int) {
+        let remoteAliases = try await cloudKitService.fetchStadiumAliasChanges(since: lastSync)
+
+        var updated = 0
+        var skippedIncompatible = 0
+        var skippedOlder = 0
+
+        for remoteAlias in remoteAliases {
+            let result = try mergeStadiumAlias(remoteAlias, context: context)
+
+            switch result {
+            case .applied: updated += 1
+            case .skippedIncompatible: skippedIncompatible += 1
+            case .skippedOlder: skippedOlder += 1
+            }
+        }
+
+        return (updated, skippedIncompatible, skippedOlder)
+    }
+
     // MARK: - Merge Logic
 
     private enum MergeResult {
@@ -631,4 +666,41 @@ actor CanonicalSyncService {
             return .applied
         }
     }
+
+    @MainActor
+    private func mergeStadiumAlias(
+        _ remote: StadiumAlias,
+        context: ModelContext
+    ) throws -> MergeResult {
+        // Schema version check
+        guard remote.schemaVersion <= SchemaVersion.current else {
+            return .skippedIncompatible
+        }
+
+        let remoteAliasName = remote.aliasName
+        let descriptor = FetchDescriptor<StadiumAlias>(
+            predicate: #Predicate { $0.aliasName == remoteAliasName }
+        )
+        let existing = try context.fetch(descriptor).first
+
+        if let existing = existing {
+            // lastModified check
+            guard remote.lastModified > existing.lastModified else {
+                return .skippedOlder
+            }
+
+            // Update all fields (no user fields on StadiumAlias)
+            existing.stadiumCanonicalId = remote.stadiumCanonicalId
+            existing.validFrom = remote.validFrom
+            existing.validUntil = remote.validUntil
+            existing.schemaVersion = remote.schemaVersion
+            existing.lastModified = remote.lastModified
+
+            return .applied
+        } else {
+            // Insert new
+            context.insert(remote)
+            return .applied
+        }
+    }
 }

SportsTime/Core/Services/CloudKitDataProvider.swift

@@ -1,108 +0,0 @@
-//
-//  CloudKitDataProvider.swift
-//  SportsTime
-//
-//  Wraps CloudKitService to conform to DataProvider protocol
-//
-
-import Foundation
-
-actor CloudKitDataProvider: DataProvider {
-
-    private let cloudKit = CloudKitService.shared
-
-    // MARK: - Availability
-
-    func checkAvailability() async throws {
-        try await cloudKit.checkAvailabilityWithError()
-    }
-
-    // MARK: - DataProvider Protocol
-
-    func fetchTeams(for sport: Sport) async throws -> [Team] {
-        do {
-            try await checkAvailability()
-            return try await cloudKit.fetchTeams(for: sport)
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    func fetchAllTeams() async throws -> [Team] {
-        do {
-            try await checkAvailability()
-            var allTeams: [Team] = []
-            for sport in Sport.supported {
-                let teams = try await cloudKit.fetchTeams(for: sport)
-                allTeams.append(contentsOf: teams)
-            }
-            return allTeams
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    func fetchStadiums() async throws -> [Stadium] {
-        do {
-            try await checkAvailability()
-            return try await cloudKit.fetchStadiums()
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game] {
-        do {
-            try await checkAvailability()
-            return try await cloudKit.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    func fetchGame(by id: UUID) async throws -> Game? {
-        do {
-            try await checkAvailability()
-            return try await cloudKit.fetchGame(by: id)
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame] {
-        do {
-            try await checkAvailability()
-
-            // Fetch all required data
-            async let gamesTask = cloudKit.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
-            async let teamsTask = fetchAllTeamsInternal()
-            async let stadiumsTask = cloudKit.fetchStadiums()
-
-            let (games, teams, stadiums) = try await (gamesTask, teamsTask, stadiumsTask)
-
-            let teamsById = Dictionary(uniqueKeysWithValues: teams.map { ($0.id, $0) })
-            let stadiumsById = Dictionary(uniqueKeysWithValues: stadiums.map { ($0.id, $0) })
-
-            return games.compactMap { game in
-                guard let homeTeam = teamsById[game.homeTeamId],
-                      let awayTeam = teamsById[game.awayTeamId],
-                      let stadium = stadiumsById[game.stadiumId] else {
-                    return nil
-                }
-                return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
-            }
-        } catch {
-            throw CloudKitError.from(error)
-        }
-    }
-
-    // Internal helper to avoid duplicate availability checks
-    private func fetchAllTeamsInternal() async throws -> [Team] {
-        var allTeams: [Team] = []
-        for sport in Sport.supported {
-            let teams = try await cloudKit.fetchTeams(for: sport)
-            allTeams.append(contentsOf: teams)
-        }
-        return allTeams
-    }
-}

SportsTime/Core/Services/CloudKitService.swift

@@ -228,6 +228,24 @@ actor CloudKitService {
         }
     }
 
+    func fetchStadiumAliases(for stadiumCanonicalId: String? = nil) async throws -> [StadiumAlias] {
+        let predicate: NSPredicate
+        if let stadiumId = stadiumCanonicalId {
+            predicate = NSPredicate(format: "stadiumCanonicalId == %@", stadiumId)
+        } else {
+            predicate = NSPredicate(value: true)
+        }
+
+        let query = CKQuery(recordType: CKRecordType.stadiumAlias, predicate: predicate)
+
+        let (results, _) = try await publicDatabase.records(matching: query)
+
+        return results.compactMap { result in
+            guard case .success(let record) = result.1 else { return nil }
+            return CKStadiumAlias(record: record).toModel()
+        }
+    }
+
     // MARK: - Delta Sync (Date-Based for Public Database)
 
     /// Fetch league structure records modified after the given date
@@ -270,6 +288,26 @@ actor CloudKitService {
         }
     }
 
+    /// Fetch stadium alias records modified after the given date
+    func fetchStadiumAliasChanges(since lastSync: Date?) async throws -> [StadiumAlias] {
+        let predicate: NSPredicate
+        if let lastSync = lastSync {
+            predicate = NSPredicate(format: "lastModified > %@", lastSync as NSDate)
+        } else {
+            predicate = NSPredicate(value: true)
+        }
+
+        let query = CKQuery(recordType: CKRecordType.stadiumAlias, predicate: predicate)
+        query.sortDescriptors = [NSSortDescriptor(key: CKStadiumAlias.lastModifiedKey, ascending: true)]
+
+        let (results, _) = try await publicDatabase.records(matching: query)
+
+        return results.compactMap { result in
+            guard case .success(let record) = result.1 else { return nil }
+            return CKStadiumAlias(record: record).toModel()
+        }
+    }
+
     // MARK: - Sync Status
 
     func checkAccountStatus() async -> CKAccountStatus {
@@ -327,10 +365,26 @@ actor CloudKitService {
         try await publicDatabase.save(subscription)
     }
 
+    func subscribeToStadiumAliasUpdates() async throws {
+        let subscription = CKQuerySubscription(
+            recordType: CKRecordType.stadiumAlias,
+            predicate: NSPredicate(value: true),
+            subscriptionID: "stadium-alias-updates",
+            options: [.firesOnRecordCreation, .firesOnRecordUpdate]
+        )
+
+        let notification = CKSubscription.NotificationInfo()
+        notification.shouldSendContentAvailable = true
+        subscription.notificationInfo = notification
+
+        try await publicDatabase.save(subscription)
+    }
+
     /// Subscribe to all canonical data updates
     func subscribeToAllUpdates() async throws {
         try await subscribeToScheduleUpdates()
         try await subscribeToLeagueStructureUpdates()
         try await subscribeToTeamAliasUpdates()
+        try await subscribeToStadiumAliasUpdates()
     }
 }

SportsTime/Core/Services/DataProvider.swift

@@ -2,61 +2,90 @@
 //  DataProvider.swift
 //  SportsTime
 //
+//  Unified data provider that reads from SwiftData for offline support.
+//  Data is bootstrapped from bundled JSON and can be synced via CloudKit.
+//
 
 import Foundation
+import SwiftData
 import Combine
 
-/// Protocol defining data operations for teams, stadiums, and games
-protocol DataProvider: Sendable {
-    func fetchTeams(for sport: Sport) async throws -> [Team]
-    func fetchAllTeams() async throws -> [Team]
-    func fetchStadiums() async throws -> [Stadium]
-    func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game]
-    func fetchGame(by id: UUID) async throws -> Game?
-
-    // Resolved data (with team/stadium references)
-    func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame]
-}
-
-/// Environment-aware data provider that switches between stub and CloudKit
+/// Environment-aware data provider that reads from SwiftData (offline-first)
 @MainActor
 final class AppDataProvider: ObservableObject {
     static let shared = AppDataProvider()
 
-    private let provider: any DataProvider
-
     @Published private(set) var teams: [Team] = []
     @Published private(set) var stadiums: [Stadium] = []
     @Published private(set) var isLoading = false
     @Published private(set) var error: Error?
     @Published private(set) var errorMessage: String?
-    @Published private(set) var isUsingStubData: Bool
 
     private var teamsById: [UUID: Team] = [:]
     private var stadiumsById: [UUID: Stadium] = [:]
+    private var stadiumsByCanonicalId: [String: Stadium] = [:]
+    private var teamsByCanonicalId: [String: Team] = [:]
 
-    private init() {
-        #if targetEnvironment(simulator)
-        self.provider = StubDataProvider()
-        self.isUsingStubData = true
-        #else
-        self.provider = CloudKitDataProvider()
-        self.isUsingStubData = false
-        #endif
+    // Canonical ID lookups for game conversion
+    private var canonicalTeamUUIDs: [String: UUID] = [:]
+    private var canonicalStadiumUUIDs: [String: UUID] = [:]
+
+    private var modelContext: ModelContext?
+
+    private init() {}
+
+    // MARK: - Configuration
+
+    /// Set the model context for SwiftData access
+    func configure(with context: ModelContext) {
+        self.modelContext = context
     }
 
     // MARK: - Data Loading
 
+    /// Load all data from SwiftData into memory for fast access
     func loadInitialData() async {
+        guard let context = modelContext else {
+            errorMessage = "Model context not configured"
+            return
+        }
+
         isLoading = true
         error = nil
         errorMessage = nil
 
         do {
-            async let teamsTask = provider.fetchAllTeams()
-            async let stadiumsTask = provider.fetchStadiums()
+            // Fetch canonical stadiums from SwiftData
+            let stadiumDescriptor = FetchDescriptor<CanonicalStadium>(
+                predicate: #Predicate { $0.deprecatedAt == nil }
+            )
+            let canonicalStadiums = try context.fetch(stadiumDescriptor)
 
-            let (loadedTeams, loadedStadiums) = try await (teamsTask, stadiumsTask)
+            // Convert to domain models and build lookups
+            var loadedStadiums: [Stadium] = []
+            for canonical in canonicalStadiums {
+                let stadium = canonical.toDomain()
+                loadedStadiums.append(stadium)
+                stadiumsByCanonicalId[canonical.canonicalId] = stadium
+                canonicalStadiumUUIDs[canonical.canonicalId] = stadium.id
+            }
+
+            // Fetch canonical teams from SwiftData
+            let teamDescriptor = FetchDescriptor<CanonicalTeam>(
+                predicate: #Predicate { $0.deprecatedAt == nil }
+            )
+            let canonicalTeams = try context.fetch(teamDescriptor)
+
+            // Convert to domain models
+            var loadedTeams: [Team] = []
+            for canonical in canonicalTeams {
+                // Get stadium UUID for this team
+                let stadiumUUID = canonicalStadiumUUIDs[canonical.stadiumCanonicalId] ?? UUID()
+                let team = canonical.toDomain(stadiumUUID: stadiumUUID)
+                loadedTeams.append(team)
+                teamsByCanonicalId[canonical.canonicalId] = team
+                canonicalTeamUUIDs[canonical.canonicalId] = team.id
+            }
 
             self.teams = loadedTeams
             self.stadiums = loadedStadiums
@@ -64,9 +93,7 @@ final class AppDataProvider: ObservableObject {
             // Build lookup dictionaries
             self.teamsById = Dictionary(uniqueKeysWithValues: loadedTeams.map { ($0.id, $0) })
             self.stadiumsById = Dictionary(uniqueKeysWithValues: loadedStadiums.map { ($0.id, $0) })
-        } catch let cloudKitError as CloudKitError {
-            self.error = cloudKitError
-            self.errorMessage = cloudKitError.errorDescription
+
         } catch {
             self.error = error
             self.errorMessage = error.localizedDescription
@@ -98,12 +125,71 @@ final class AppDataProvider: ObservableObject {
         teams.filter { $0.sport == sport }
     }
 
+    // MARK: - Game Fetching
+
+    /// Fetch games from SwiftData within date range
     func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game] {
-        try await provider.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
+        guard let context = modelContext else {
+            throw DataProviderError.contextNotConfigured
+        }
+
+        let sportStrings = sports.map { $0.rawValue }
+
+        let descriptor = FetchDescriptor<CanonicalGame>(
+            predicate: #Predicate<CanonicalGame> { game in
+                game.deprecatedAt == nil &&
+                game.dateTime >= startDate &&
+                game.dateTime <= endDate
+            }
+        )
+
+        let canonicalGames = try context.fetch(descriptor)
+
+        // Filter by sport and convert to domain models
+        return canonicalGames.compactMap { canonical -> Game? in
+            guard sportStrings.contains(canonical.sport) else { return nil }
+
+            let homeTeamUUID = canonicalTeamUUIDs[canonical.homeTeamCanonicalId] ?? UUID()
+            let awayTeamUUID = canonicalTeamUUIDs[canonical.awayTeamCanonicalId] ?? UUID()
+            let stadiumUUID = canonicalStadiumUUIDs[canonical.stadiumCanonicalId] ?? UUID()
+
+            return canonical.toDomain(
+                homeTeamUUID: homeTeamUUID,
+                awayTeamUUID: awayTeamUUID,
+                stadiumUUID: stadiumUUID
+            )
+        }
     }
 
+    /// Fetch a single game by ID
+    func fetchGame(by id: UUID) async throws -> Game? {
+        guard let context = modelContext else {
+            throw DataProviderError.contextNotConfigured
+        }
+
+        let idString = id.uuidString
+        let descriptor = FetchDescriptor<CanonicalGame>(
+            predicate: #Predicate<CanonicalGame> { $0.canonicalId == idString }
+        )
+
+        guard let canonical = try context.fetch(descriptor).first else {
+            return nil
+        }
+
+        let homeTeamUUID = canonicalTeamUUIDs[canonical.homeTeamCanonicalId] ?? UUID()
+        let awayTeamUUID = canonicalTeamUUIDs[canonical.awayTeamCanonicalId] ?? UUID()
+        let stadiumUUID = canonicalStadiumUUIDs[canonical.stadiumCanonicalId] ?? UUID()
+
+        return canonical.toDomain(
+            homeTeamUUID: homeTeamUUID,
+            awayTeamUUID: awayTeamUUID,
+            stadiumUUID: stadiumUUID
+        )
+    }
+
+    /// Fetch games with full team and stadium data
     func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame] {
-        let games = try await provider.fetchGames(sports: sports, startDate: startDate, endDate: endDate)
+        let games = try await fetchGames(sports: sports, startDate: startDate, endDate: endDate)
 
         return games.compactMap { game in
             guard let homeTeam = teamsById[game.homeTeamId],
@@ -124,3 +210,16 @@ final class AppDataProvider: ObservableObject {
         return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
     }
 }
+
+// MARK: - Errors
+
+enum DataProviderError: Error, LocalizedError {
+    case contextNotConfigured
+
+    var errorDescription: String? {
+        switch self {
+        case .contextNotConfigured:
+            return "Data provider not configured with model context"
+        }
+    }
+}

SportsTime/Core/Services/StubDataProvider.swift

@@ -1,373 +0,0 @@
-//
-//  StubDataProvider.swift
-//  SportsTime
-//
-//  Provides real data from bundled JSON files for Simulator testing
-//
-
-import Foundation
-import CryptoKit
-
-actor StubDataProvider: DataProvider {
-
-    // MARK: - JSON Models
-
-    private struct JSONGame: Codable {
-        let id: String
-        let sport: String
-        let season: String
-        let date: String
-        let time: String?
-        let home_team: String
-        let away_team: String
-        let home_team_abbrev: String
-        let away_team_abbrev: String
-        let venue: String
-        let source: String
-        let is_playoff: Bool
-        let broadcast: String?
-    }
-
-    private struct JSONStadium: Codable {
-        let id: String
-        let name: String
-        let city: String
-        let state: String
-        let latitude: Double
-        let longitude: Double
-        let capacity: Int
-        let sport: String
-        let team_abbrevs: [String]
-        let source: String
-        let year_opened: Int?
-    }
-
-    // MARK: - Cached Data
-
-    private var cachedGames: [Game]?
-    private var cachedTeams: [Team]?
-    private var cachedStadiums: [Stadium]?
-    private var teamsByAbbrev: [String: Team] = [:]
-    private var stadiumsByVenue: [String: Stadium] = [:]
-
-    // MARK: - DataProvider Protocol
-
-    func fetchTeams(for sport: Sport) async throws -> [Team] {
-        try await loadAllDataIfNeeded()
-        return cachedTeams?.filter { $0.sport == sport } ?? []
-    }
-
-    func fetchAllTeams() async throws -> [Team] {
-        try await loadAllDataIfNeeded()
-        return cachedTeams ?? []
-    }
-
-    func fetchStadiums() async throws -> [Stadium] {
-        try await loadAllDataIfNeeded()
-        return cachedStadiums ?? []
-    }
-
-    func fetchGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [Game] {
-        try await loadAllDataIfNeeded()
-
-        return (cachedGames ?? []).filter { game in
-            sports.contains(game.sport) &&
-            game.dateTime >= startDate &&
-            game.dateTime <= endDate
-        }
-    }
-
-    func fetchGame(by id: UUID) async throws -> Game? {
-        try await loadAllDataIfNeeded()
-        return cachedGames?.first { $0.id == id }
-    }
-
-    func fetchRichGames(sports: Set<Sport>, startDate: Date, endDate: Date) async throws -> [RichGame] {
-        try await loadAllDataIfNeeded()
-
-        let games = try await fetchGames(sports: sports, startDate: startDate, endDate: endDate)
-        let teamsById = Dictionary(uniqueKeysWithValues: (cachedTeams ?? []).map { ($0.id, $0) })
-        let stadiumsById = Dictionary(uniqueKeysWithValues: (cachedStadiums ?? []).map { ($0.id, $0) })
-
-        return games.compactMap { game in
-            guard let homeTeam = teamsById[game.homeTeamId],
-                  let awayTeam = teamsById[game.awayTeamId],
-                  let stadium = stadiumsById[game.stadiumId] else {
-                return nil
-            }
-            return RichGame(game: game, homeTeam: homeTeam, awayTeam: awayTeam, stadium: stadium)
-        }
-    }
-
-    // MARK: - Data Loading
-
-    private func loadAllDataIfNeeded() async throws {
-        guard cachedGames == nil else { return }
-
-        // Load stadiums first
-        let jsonStadiums = try loadStadiumsJSON()
-        cachedStadiums = jsonStadiums.map { convertStadium($0) }
-
-        // Build stadium lookup by venue name
-        for stadium in cachedStadiums ?? [] {
-            stadiumsByVenue[stadium.name.lowercased()] = stadium
-        }
-
-        // Load games and extract teams
-        let jsonGames = try loadGamesJSON()
-
-        // Build teams from games data
-        var teamsDict: [String: Team] = [:]
-        for jsonGame in jsonGames {
-            let sport = parseSport(jsonGame.sport)
-
-            // Home team
-            let homeKey = "\(sport.rawValue)_\(jsonGame.home_team_abbrev)"
-            if teamsDict[homeKey] == nil {
-                let stadiumId = findStadiumId(venue: jsonGame.venue, sport: sport)
-                let team = Team(
-                    id: deterministicUUID(from: homeKey),
-                    name: extractTeamName(from: jsonGame.home_team),
-                    abbreviation: jsonGame.home_team_abbrev,
-                    sport: sport,
-                    city: extractCity(from: jsonGame.home_team),
-                    stadiumId: stadiumId
-                )
-                teamsDict[homeKey] = team
-                teamsByAbbrev[homeKey] = team
-            }
-
-            // Away team
-            let awayKey = "\(sport.rawValue)_\(jsonGame.away_team_abbrev)"
-            if teamsDict[awayKey] == nil {
-                // Away teams might not have a stadium in our data yet
-                let team = Team(
-                    id: deterministicUUID(from: awayKey),
-                    name: extractTeamName(from: jsonGame.away_team),
-                    abbreviation: jsonGame.away_team_abbrev,
-                    sport: sport,
-                    city: extractCity(from: jsonGame.away_team),
-                    stadiumId: UUID() // Placeholder, will be updated when they're home team
-                )
-                teamsDict[awayKey] = team
-                teamsByAbbrev[awayKey] = team
-            }
-        }
-        cachedTeams = Array(teamsDict.values)
-
-        // Convert games (deduplicate by ID - JSON may have duplicate entries)
-        var seenGameIds = Set<String>()
-        let uniqueJsonGames = jsonGames.filter { game in
-            if seenGameIds.contains(game.id) {
-                return false
-            }
-            seenGameIds.insert(game.id)
-            return true
-        }
-        cachedGames = uniqueJsonGames.compactMap { convertGame($0) }
-    }
-
-    private func loadGamesJSON() throws -> [JSONGame] {
-        guard let url = Bundle.main.url(forResource: "games", withExtension: "json") else {
-            return []
-        }
-        let data = try Data(contentsOf: url)
-        return try JSONDecoder().decode([JSONGame].self, from: data)
-    }
-
-    private func loadStadiumsJSON() throws -> [JSONStadium] {
-        guard let url = Bundle.main.url(forResource: "stadiums", withExtension: "json") else {
-            return []
-        }
-        let data = try Data(contentsOf: url)
-        return try JSONDecoder().decode([JSONStadium].self, from: data)
-    }
-
-    // MARK: - Conversion Helpers
-
-    private func convertStadium(_ json: JSONStadium) -> Stadium {
-        Stadium(
-            id: deterministicUUID(from: json.id),
-            name: json.name,
-            city: json.city,
-            state: json.state.isEmpty ? stateFromCity(json.city) : json.state,
-            latitude: json.latitude,
-            longitude: json.longitude,
-            capacity: json.capacity,
-            sport: parseSport(json.sport),
-            yearOpened: json.year_opened
-        )
-    }
-
-    private func convertGame(_ json: JSONGame) -> Game? {
-        let sport = parseSport(json.sport)
-
-        let homeKey = "\(sport.rawValue)_\(json.home_team_abbrev)"
-        let awayKey = "\(sport.rawValue)_\(json.away_team_abbrev)"
-
-        guard let homeTeam = teamsByAbbrev[homeKey],
-              let awayTeam = teamsByAbbrev[awayKey] else {
-            return nil
-        }
-
-        let stadiumId = findStadiumId(venue: json.venue, sport: sport)
-
-        guard let dateTime = parseDateTime(date: json.date, time: json.time ?? "7:00p") else {
-            return nil
-        }
-
-        return Game(
-            id: deterministicUUID(from: json.id),
-            homeTeamId: homeTeam.id,
-            awayTeamId: awayTeam.id,
-            stadiumId: stadiumId,
-            dateTime: dateTime,
-            sport: sport,
-            season: json.season,
-            isPlayoff: json.is_playoff,
-            broadcastInfo: json.broadcast
-        )
-    }
-
-    private func parseSport(_ sport: String) -> Sport {
-        switch sport.uppercased() {
-        case "MLB": return .mlb
-        case "NBA": return .nba
-        case "NHL": return .nhl
-        case "NFL": return .nfl
-        case "MLS": return .mls
-        default: return .mlb
-        }
-    }
-
-    private func parseDateTime(date: String, time: String) -> Date? {
-        let formatter = DateFormatter()
-        formatter.locale = Locale(identifier: "en_US_POSIX")
-
-        // Parse date
-        formatter.dateFormat = "yyyy-MM-dd"
-        guard let dateOnly = formatter.date(from: date) else { return nil }
-
-        // Parse time (e.g., "7:30p", "10:00p", "1:05p")
-        var hour = 12
-        var minute = 0
-
-        let cleanTime = time.lowercased().replacingOccurrences(of: " ", with: "")
-        let isPM = cleanTime.contains("p")
-        let timeWithoutAMPM = cleanTime.replacingOccurrences(of: "p", with: "").replacingOccurrences(of: "a", with: "")
-
-        let components = timeWithoutAMPM.split(separator: ":")
-        if !components.isEmpty, let h = Int(components[0]) {
-            hour = h
-            if isPM && hour != 12 {
-                hour += 12
-            } else if !isPM && hour == 12 {
-                hour = 0
-            }
-        }
-        if components.count > 1, let m = Int(components[1]) {
-            minute = m
-        }
-
-        return Calendar.current.date(bySettingHour: hour, minute: minute, second: 0, of: dateOnly)
-    }
-
-    // Venue name aliases for stadiums that changed names
-    private static let venueAliases: [String: String] = [
-        "daikin park": "minute maid park",                    // Houston Astros (renamed 2024)
-        "rate field": "guaranteed rate field",                // Chicago White Sox
-        "george m. steinbrenner field": "tropicana field",    // Tampa Bay spring training → main stadium
-        "loandepot park": "loandepot park",                   // Miami - ensure case match
-    ]
-
-    private func findStadiumId(venue: String, sport: Sport) -> UUID {
-        var venueLower = venue.lowercased()
-
-        // Check for known aliases
-        if let aliasedName = Self.venueAliases[venueLower] {
-            venueLower = aliasedName
-        }
-
-        // Try exact match
-        if let stadium = stadiumsByVenue[venueLower] {
-            return stadium.id
-        }
-
-        // Try partial match
-        for (name, stadium) in stadiumsByVenue {
-            if name.contains(venueLower) || venueLower.contains(name) {
-                return stadium.id
-            }
-        }
-
-        // Generate deterministic ID for unknown venues
-        return deterministicUUID(from: "venue_\(venue)")
-    }
-
-    private func deterministicUUID(from string: String) -> UUID {
-        // Create a deterministic UUID using SHA256 (truly deterministic across launches)
-        let data = Data(string.utf8)
-        let hash = SHA256.hash(data: data)
-        let hashBytes = Array(hash)
-
-        // Use first 16 bytes of SHA256 hash
-        var bytes = Array(hashBytes.prefix(16))
-
-        // Set UUID version (4) and variant bits
-        bytes[6] = (bytes[6] & 0x0F) | 0x40
-        bytes[8] = (bytes[8] & 0x3F) | 0x80
-
-        return UUID(uuid: (
-            bytes[0], bytes[1], bytes[2], bytes[3],
-            bytes[4], bytes[5], bytes[6], bytes[7],
-            bytes[8], bytes[9], bytes[10], bytes[11],
-            bytes[12], bytes[13], bytes[14], bytes[15]
-        ))
-    }
-
-    private func extractTeamName(from fullName: String) -> String {
-        // "Boston Celtics" -> "Celtics"
-        let parts = fullName.split(separator: " ")
-        if parts.count > 1 {
-            return parts.dropFirst().joined(separator: " ")
-        }
-        return fullName
-    }
-
-    private func extractCity(from fullName: String) -> String {
-        // "Boston Celtics" -> "Boston"
-        // "New York Knicks" -> "New York"
-        // "Los Angeles Lakers" -> "Los Angeles"
-        let knownCities = [
-            "New York", "Los Angeles", "San Francisco", "San Diego", "San Antonio",
-            "New Orleans", "Oklahoma City", "Salt Lake City", "Kansas City",
-            "St. Louis", "St Louis"
-        ]
-
-        for city in knownCities {
-            if fullName.hasPrefix(city) {
-                return city
-            }
-        }
-
-        // Default: first word
-        return String(fullName.split(separator: " ").first ?? Substring(fullName))
-    }
-
-    private func stateFromCity(_ city: String) -> String {
-        let cityToState: [String: String] = [
-            "Atlanta": "GA", "Boston": "MA", "Brooklyn": "NY", "Charlotte": "NC",
-            "Chicago": "IL", "Cleveland": "OH", "Dallas": "TX", "Denver": "CO",
-            "Detroit": "MI", "Houston": "TX", "Indianapolis": "IN", "Los Angeles": "CA",
-            "Memphis": "TN", "Miami": "FL", "Milwaukee": "WI", "Minneapolis": "MN",
-            "New Orleans": "LA", "New York": "NY", "Oklahoma City": "OK", "Orlando": "FL",
-            "Philadelphia": "PA", "Phoenix": "AZ", "Portland": "OR", "Sacramento": "CA",
-            "San Antonio": "TX", "San Francisco": "CA", "Seattle": "WA", "Toronto": "ON",
-            "Washington": "DC", "Las Vegas": "NV", "Tampa": "FL", "Pittsburgh": "PA",
-            "Baltimore": "MD", "Cincinnati": "OH", "St. Louis": "MO", "Kansas City": "MO",
-            "Arlington": "TX", "Anaheim": "CA", "Oakland": "CA", "San Diego": "CA",
-            "Tampa Bay": "FL", "St Petersburg": "FL", "Salt Lake City": "UT"
-        ]
-        return cityToState[city] ?? ""
-    }
-}

SportsTime/Info.plist

@@ -5,6 +5,8 @@
 	<key>UIBackgroundModes</key>
 	<array>
 		<string>remote-notification</string>
+		<string>fetch</string>
+		<string>processing</string>
 	</array>
 </dict>
 </plist>

SportsTime/SportsTimeApp.swift

@@ -90,13 +90,48 @@ struct BootstrappedContentView: View {
         let bootstrapService = BootstrapService()
 
         do {
+            // 1. Bootstrap from bundled JSON if first launch (no data exists)
             try await bootstrapService.bootstrapIfNeeded(context: context)
+
+            // 2. Configure DataProvider with SwiftData context
+            AppDataProvider.shared.configure(with: context)
+
+            // 3. Load data from SwiftData into memory
+            await AppDataProvider.shared.loadInitialData()
+
+            // 4. App is now usable
             isBootstrapping = false
+
+            // 5. Background: Try to refresh from CloudKit (non-blocking)
+            Task.detached(priority: .background) {
+                await self.performBackgroundSync(context: context)
+            }
         } catch {
             bootstrapError = error
             isBootstrapping = false
         }
     }
+
+    @MainActor
+    private func performBackgroundSync(context: ModelContext) async {
+        let syncService = CanonicalSyncService()
+
+        do {
+            let result = try await syncService.syncAll(context: context)
+
+            // If any data was updated, reload the DataProvider
+            if !result.isEmpty {
+                await AppDataProvider.shared.loadInitialData()
+                print("CloudKit sync completed: \(result.totalUpdated) items updated")
+            }
+        } catch CanonicalSyncService.SyncError.cloudKitUnavailable {
+            // Offline or CloudKit not available - silently continue with local data
+            print("CloudKit unavailable, using local data")
+        } catch {
+            // Other sync errors - log but don't interrupt user
+            print("Background sync error: \(error.localizedDescription)")
+        }
+    }
 }
 
 // MARK: - Bootstrap Loading View