diff --git a/lib/data/interfaces/connections_repo_intf.dart b/lib/data/interfaces/connections_repo_intf.dart
index 8d64be6..36beb28 100644
--- a/lib/data/interfaces/connections_repo_intf.dart
+++ b/lib/data/interfaces/connections_repo_intf.dart
@@ -1,5 +1,3 @@
-import 'dart:collection';
-
 import 'package:result_monad/result_monad.dart';
 
 import '../../models/connection.dart';
@@ -26,15 +24,11 @@ class IConnectionsRepo {
     throw UnimplementedError();
   }
 
-  Result<Connection, ExecError> getByProfileUrl(String url) {
+  List<Connection> getMyContacts() {
     throw UnimplementedError();
   }
 
-  UnmodifiableListView<Connection> getMyContacts() {
-    throw UnimplementedError();
-  }
-
-  UnmodifiableListView<Connection> getKnownUsersByName(String name) {
+  List<Connection> getKnownUsersByName(String name) {
     throw UnimplementedError();
   }
 }
diff --git a/lib/data/memory/memory_connections_repo.dart b/lib/data/memory/memory_connections_repo.dart
index 2f4dfee..bd43aa8 100644
--- a/lib/data/memory/memory_connections_repo.dart
+++ b/lib/data/memory/memory_connections_repo.dart
@@ -1,5 +1,3 @@
-import 'dart:collection';
-
 import 'package:result_monad/result_monad.dart';
 
 import '../../models/connection.dart';
@@ -9,7 +7,6 @@ import '../interfaces/connections_repo_intf.dart';
 class MemoryConnectionsRepo implements IConnectionsRepo {
   final _connectionsById = <String, Connection>{};
   final _connectionsByName = <String, Connection>{};
-  final _connectionsByProfileUrl = <String, Connection>{};
   final _myContacts = <Connection>[];
 
   @override
@@ -32,21 +29,20 @@ class MemoryConnectionsRepo implements IConnectionsRepo {
   }
 
   @override
-  UnmodifiableListView<Connection> getKnownUsersByName(String name) {
-    return UnmodifiableListView(_connectionsByName.values.where((it) {
+  List<Connection> getKnownUsersByName(String name) {
+    return _connectionsByName.values.where((it) {
       final normalizedHandle = it.handle.toLowerCase();
       final normalizedName = it.name.toLowerCase();
       final normalizedQuery = name.toLowerCase();
       return normalizedHandle.contains(normalizedQuery) ||
           normalizedName.contains(normalizedQuery);
-    }));
+    }).toList();
   }
 
   @override
   bool updateConnection(Connection connection) {
     _connectionsById[connection.id] = connection;
     _connectionsByName[connection.name] = connection;
-    _connectionsByProfileUrl[connection.profileUrl.toString()] = connection;
     int index = _myContacts.indexWhere((c) => c.id == connection.id);
     if (index >= 0) {
       _myContacts.removeAt(index);
@@ -69,8 +65,8 @@ class MemoryConnectionsRepo implements IConnectionsRepo {
   }
 
   @override
-  UnmodifiableListView<Connection> getMyContacts() {
-    return UnmodifiableListView(_myContacts);
+  List<Connection> getMyContacts() {
+    return _myContacts;
   }
 
   @override
@@ -98,16 +94,4 @@ class MemoryConnectionsRepo implements IConnectionsRepo {
 
     return Result.ok(result);
   }
-
-  @override
-  Result<Connection, ExecError> getByProfileUrl(String url) {
-    final result = _connectionsByProfileUrl[url];
-    if (result == null) {
-      return Result.error(ExecError(
-        type: ErrorType.notFound,
-        message: '$url not found',
-      ));
-    }
-    return Result.ok(result);
-  }
 }
diff --git a/lib/data/objectbox/objectbox_cache.dart b/lib/data/objectbox/objectbox_cache.dart
new file mode 100644
index 0000000..dc0eb0a
--- /dev/null
+++ b/lib/data/objectbox/objectbox_cache.dart
@@ -0,0 +1,19 @@
+import 'package:objectbox/objectbox.dart';
+import 'package:path/path.dart' as p;
+import 'package:path_provider/path_provider.dart';
+
+import '../../objectbox.g.dart';
+
+class ObjectBoxCache {
+  late final Store store;
+
+  ObjectBoxCache._create(this.store);
+
+  static Future<ObjectBoxCache> create() async {
+    final docsDir = await getApplicationSupportDirectory();
+
+    final path = p.join(docsDir.path, 'objectboxcache');
+    final store = await openStore(directory: path);
+    return ObjectBoxCache._create(store);
+  }
+}
diff --git a/lib/data/objectbox/objectbox_connections_repo.dart b/lib/data/objectbox/objectbox_connections_repo.dart
new file mode 100644
index 0000000..d7bae31
--- /dev/null
+++ b/lib/data/objectbox/objectbox_connections_repo.dart
@@ -0,0 +1,89 @@
+import 'package:result_monad/result_monad.dart';
+
+import '../../globals.dart';
+import '../../models/connection.dart';
+import '../../models/exec_error.dart';
+import '../../objectbox.g.dart';
+import '../interfaces/connections_repo_intf.dart';
+import 'objectbox_cache.dart';
+
+class ObjectBoxConnectionsRepo implements IConnectionsRepo {
+  late final Box<Connection> box;
+
+  ObjectBoxConnectionsRepo() {
+    box = getIt<ObjectBoxCache>().store.box<Connection>();
+  }
+
+  @override
+  bool addAllConnections(Iterable<Connection> newConnections) {
+    final result = box.putMany(newConnections.toList());
+    return result.length == newConnections.length;
+  }
+
+  @override
+  bool addConnection(Connection connection) {
+    box.putAsync(connection);
+    return true;
+  }
+
+  @override
+  Result<Connection, ExecError> getById(String id) {
+    return _getConnection(
+      Connection_.id.equals(id),
+    ).mapError(
+      (error) => error.copy(
+        message: "Can't find Connection for ID: $id",
+      ),
+    );
+  }
+
+  @override
+  Result<Connection, ExecError> getByName(String name) {
+    return _getConnection(
+      Connection_.name.equals(name),
+    ).mapError(
+      (error) => error.copy(
+        message: "Can't find Connection for ID: $name",
+      ),
+    );
+  }
+
+  @override
+  List<Connection> getKnownUsersByName(String name) {
+    return box
+        .query(
+          Connection_.name.contains(name, caseSensitive: false) |
+              Connection_.handle.contains(name, caseSensitive: false),
+        )
+        .build()
+        .find();
+  }
+
+  @override
+  List<Connection> getMyContacts() {
+    final connectedStatuses = [
+      ConnectionStatus.youFollowThem.code,
+      ConnectionStatus.theyFollowYou.code,
+      ConnectionStatus.mutual.code,
+    ];
+    return box
+        .query(Connection_.dbStatus.oneOf(connectedStatuses))
+        .build()
+        .find();
+  }
+
+  @override
+  bool updateConnection(Connection connection) {
+    box.put(connection);
+    return true;
+  }
+
+  Result<Connection, ExecError> _getConnection(Condition<Connection> query) {
+    final result = box.query(query).build().findFirst();
+    if (result == null) {
+      return buildErrorResult(type: ErrorType.notFound);
+    }
+
+    return Result.ok(result);
+  }
+}
diff --git a/lib/main.dart b/lib/main.dart
index bed7230..7d8343c 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,14 +1,15 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_dotenv/flutter_dotenv.dart';
-import 'package:friendica_portal/data/interfaces/groups_repo.intf.dart';
 import 'package:logging/logging.dart';
 import 'package:multi_trigger_autocomplete/multi_trigger_autocomplete.dart';
 import 'package:provider/provider.dart';
 import 'package:result_monad/result_monad.dart';
 
 import 'data/interfaces/connections_repo_intf.dart';
-import 'data/memory/memory_connections_repo.dart';
+import 'data/interfaces/groups_repo.intf.dart';
 import 'data/memory/memory_groups_repo.dart';
+import 'data/objectbox/objectbox_cache.dart';
+import 'data/objectbox/objectbox_connections_repo.dart';
 import 'globals.dart';
 import 'models/TimelineIdentifiers.dart';
 import 'routes.dart';
@@ -49,7 +50,10 @@ void main() async {
     await service.initialize();
     return service;
   });
-  getIt.registerSingleton<IConnectionsRepo>(MemoryConnectionsRepo());
+
+  final objectBoxCache = await ObjectBoxCache.create();
+  getIt.registerSingleton<ObjectBoxCache>(objectBoxCache);
+  getIt.registerSingleton<IConnectionsRepo>(ObjectBoxConnectionsRepo());
   getIt.registerSingleton<IGroupsRepo>(MemoryGroupsRepo());
   getIt.registerLazySingleton<ConnectionsManager>(() => ConnectionsManager());
   getIt.registerLazySingleton<HashtagService>(() => HashtagService());
diff --git a/lib/models/connection.dart b/lib/models/connection.dart
index 43b13c2..00b9e6d 100644
--- a/lib/models/connection.dart
+++ b/lib/models/connection.dart
@@ -1,44 +1,67 @@
+import 'package:objectbox/objectbox.dart';
+
+@Entity()
 class Connection {
-  final ConnectionStatus status;
+  @Id()
+  int obId;
+
+  ConnectionStatus status;
+
+  int get dbStatus => status.code;
+
+  set dbStatus(int value) => status = ConnectionStatus.fromValue(value);
 
   final String name;
 
   final String handle;
 
+  @Unique(onConflict: ConflictStrategy.replace)
   final String id;
 
-  final Uri profileUrl;
+  final String profileUrl;
 
   final String network;
 
-  final Uri avatarUrl;
+  final String avatarUrl;
 
-  Connection({this.status = ConnectionStatus.unknown,
-    this.name = '',
-    this.handle = '',
-    this.id = '',
-    Uri? profileUrl,
-    this.network = '',
-    Uri? avatarUrl})
-      : profileUrl = profileUrl ?? Uri(),
-        avatarUrl = avatarUrl ?? Uri();
+  @Property(type: PropertyType.date)
+  final DateTime lastUpdateTime;
+
+  Connection(
+      {this.obId = 0,
+      this.status = ConnectionStatus.unknown,
+      this.name = '',
+      this.handle = '',
+      this.id = '',
+      String? profileUrl,
+      this.network = '',
+      String? avatarUrl,
+      DateTime? lastUpdateTime})
+      : profileUrl = profileUrl ?? '',
+        avatarUrl = avatarUrl ?? '',
+        lastUpdateTime = lastUpdateTime ?? DateTime.now();
 
   bool get isEmpty =>
       name.isEmpty &&
-          id.isEmpty &&
-          network.isEmpty &&
-          status == ConnectionStatus.unknown;
+      id.isEmpty &&
+      network.isEmpty &&
+      status == ConnectionStatus.unknown;
 
   bool get isNotEmpty => !isEmpty;
 
-  Connection copy({ConnectionStatus? status,
+  Connection copy({
+    int? obId,
+    ConnectionStatus? status,
     String? name,
     String? handle,
     String? id,
-    Uri? profileUrl,
+    String? profileUrl,
     String? network,
-    Uri? avatarUrl}) =>
+    String? avatarUrl,
+    DateTime? lastUpdateTime,
+  }) =>
       Connection(
+        obId: obId ?? this.obId,
         status: status ?? this.status,
         name: name ?? this.name,
         handle: handle ?? this.handle,
@@ -46,6 +69,7 @@ class Connection {
         profileUrl: profileUrl ?? this.profileUrl,
         network: network ?? this.network,
         avatarUrl: avatarUrl ?? this.avatarUrl,
+        lastUpdateTime: lastUpdateTime ?? this.lastUpdateTime,
       );
 
   @override
@@ -56,20 +80,28 @@ class Connection {
   @override
   bool operator ==(Object other) =>
       identical(this, other) ||
-          other is Connection && runtimeType == other.runtimeType &&
-              id == other.id;
+      other is Connection && runtimeType == other.runtimeType && id == other.id;
 
   @override
   int get hashCode => id.hashCode;
 }
 
 enum ConnectionStatus {
-  youFollowThem,
-  theyFollowYou,
-  mutual,
-  you,
-  none,
-  unknown,
+  youFollowThem(1),
+  theyFollowYou(2),
+  mutual(3),
+  you(4),
+  none(5),
+  unknown(6),
+  ;
+
+  final int code;
+
+  const ConnectionStatus(this.code);
+
+  factory ConnectionStatus.fromValue(int value) {
+    return ConnectionStatus.values.where((e) => e.code == value).first;
+  }
 }
 
 extension FriendStatusWriter on ConnectionStatus {
diff --git a/lib/models/exec_error.dart b/lib/models/exec_error.dart
index b0d0f68..961ef7c 100644
--- a/lib/models/exec_error.dart
+++ b/lib/models/exec_error.dart
@@ -1,11 +1,31 @@
 import 'package:result_monad/result_monad.dart';
 
+Result<T, ExecError> buildErrorResult<T>({
+  required ErrorType type,
+  String message = '',
+}) =>
+    Result.error(
+      ExecError(
+        type: type,
+        message: message,
+      ),
+    );
+
 class ExecError {
   final ErrorType type;
   final String message;
 
   ExecError({required this.type, this.message = ''});
 
+  ExecError copy({
+    ErrorType? type,
+    String? message,
+  }) =>
+      ExecError(
+        type: type ?? this.type,
+        message: message ?? this.message,
+      );
+
   @override
   String toString() {
     return 'ExecError{type: $type, message: $message}';
diff --git a/lib/objectbox-model.json b/lib/objectbox-model.json
new file mode 100644
index 0000000..1f5cef7
--- /dev/null
+++ b/lib/objectbox-model.json
@@ -0,0 +1,74 @@
+{
+  "_note1": "KEEP THIS FILE! Check it into a version control system (VCS) like git.",
+  "_note2": "ObjectBox manages crucial IDs for your object model. See docs for details.",
+  "_note3": "If you have VCS merge conflicts, you must resolve them according to ObjectBox docs.",
+  "entities": [
+    {
+      "id": "1:1213035855270739890",
+      "lastPropertyId": "9:7727190023732579468",
+      "name": "Connection",
+      "properties": [
+        {
+          "id": "1:4133343279264917280",
+          "name": "obId",
+          "type": 6,
+          "flags": 1
+        },
+        {
+          "id": "2:3393770296096844708",
+          "name": "name",
+          "type": 9
+        },
+        {
+          "id": "3:5864801995210079539",
+          "name": "handle",
+          "type": 9
+        },
+        {
+          "id": "4:2926904168461994523",
+          "name": "id",
+          "type": 9,
+          "flags": 34848,
+          "indexId": "1:8342366639839511243"
+        },
+        {
+          "id": "5:3621370552742492695",
+          "name": "network",
+          "type": 9
+        },
+        {
+          "id": "6:3054748457893853359",
+          "name": "profileUrl",
+          "type": 9
+        },
+        {
+          "id": "7:3716471511430220806",
+          "name": "avatarUrl",
+          "type": 9
+        },
+        {
+          "id": "8:3334077197732145885",
+          "name": "dbStatus",
+          "type": 6
+        },
+        {
+          "id": "9:7727190023732579468",
+          "name": "lastUpdateTime",
+          "type": 10
+        }
+      ],
+      "relations": []
+    }
+  ],
+  "lastEntityId": "1:1213035855270739890",
+  "lastIndexId": "1:8342366639839511243",
+  "lastRelationId": "0:0",
+  "lastSequenceId": "0:0",
+  "modelVersion": 5,
+  "modelVersionParserMinimum": 5,
+  "retiredEntityUids": [],
+  "retiredIndexUids": [],
+  "retiredPropertyUids": [],
+  "retiredRelationUids": [],
+  "version": 1
+}
\ No newline at end of file
diff --git a/lib/objectbox.g.dart b/lib/objectbox.g.dart
new file mode 100644
index 0000000..486e8d3
--- /dev/null
+++ b/lib/objectbox.g.dart
@@ -0,0 +1,206 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+// This code was generated by ObjectBox. To update it run the generator again:
+// With a Flutter package, run `flutter pub run build_runner build`.
+// With a Dart package, run `dart run build_runner build`.
+// See also https://docs.objectbox.io/getting-started#generate-objectbox-code
+
+// ignore_for_file: camel_case_types
+// coverage:ignore-file
+
+import 'dart:typed_data';
+
+import 'package:flat_buffers/flat_buffers.dart' as fb;
+import 'package:objectbox/internal.dart'; // generated code can access "internal" functionality
+import 'package:objectbox/objectbox.dart';
+import 'package:objectbox_flutter_libs/objectbox_flutter_libs.dart';
+
+import 'models/connection.dart';
+
+export 'package:objectbox/objectbox.dart'; // so that callers only have to import this file
+
+final _entities = <ModelEntity>[
+  ModelEntity(
+      id: const IdUid(1, 1213035855270739890),
+      name: 'Connection',
+      lastPropertyId: const IdUid(9, 7727190023732579468),
+      flags: 0,
+      properties: <ModelProperty>[
+        ModelProperty(
+            id: const IdUid(1, 4133343279264917280),
+            name: 'obId',
+            type: 6,
+            flags: 1),
+        ModelProperty(
+            id: const IdUid(2, 3393770296096844708),
+            name: 'name',
+            type: 9,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(3, 5864801995210079539),
+            name: 'handle',
+            type: 9,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(4, 2926904168461994523),
+            name: 'id',
+            type: 9,
+            flags: 34848,
+            indexId: const IdUid(1, 8342366639839511243)),
+        ModelProperty(
+            id: const IdUid(5, 3621370552742492695),
+            name: 'network',
+            type: 9,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(6, 3054748457893853359),
+            name: 'profileUrl',
+            type: 9,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(7, 3716471511430220806),
+            name: 'avatarUrl',
+            type: 9,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(8, 3334077197732145885),
+            name: 'dbStatus',
+            type: 6,
+            flags: 0),
+        ModelProperty(
+            id: const IdUid(9, 7727190023732579468),
+            name: 'lastUpdateTime',
+            type: 10,
+            flags: 0)
+      ],
+      relations: <ModelRelation>[],
+      backlinks: <ModelBacklink>[])
+];
+
+/// Open an ObjectBox store with the model declared in this file.
+Future<Store> openStore(
+        {String? directory,
+        int? maxDBSizeInKB,
+        int? fileMode,
+        int? maxReaders,
+        bool queriesCaseSensitiveDefault = true,
+        String? macosApplicationGroup}) async =>
+    Store(getObjectBoxModel(),
+        directory: directory ?? (await defaultStoreDirectory()).path,
+        maxDBSizeInKB: maxDBSizeInKB,
+        fileMode: fileMode,
+        maxReaders: maxReaders,
+        queriesCaseSensitiveDefault: queriesCaseSensitiveDefault,
+        macosApplicationGroup: macosApplicationGroup);
+
+/// ObjectBox model definition, pass it to [Store] - Store(getObjectBoxModel())
+ModelDefinition getObjectBoxModel() {
+  final model = ModelInfo(
+      entities: _entities,
+      lastEntityId: const IdUid(1, 1213035855270739890),
+      lastIndexId: const IdUid(1, 8342366639839511243),
+      lastRelationId: const IdUid(0, 0),
+      lastSequenceId: const IdUid(0, 0),
+      retiredEntityUids: const [],
+      retiredIndexUids: const [],
+      retiredPropertyUids: const [],
+      retiredRelationUids: const [],
+      modelVersion: 5,
+      modelVersionParserMinimum: 5,
+      version: 1);
+
+  final bindings = <Type, EntityDefinition>{
+    Connection: EntityDefinition<Connection>(
+        model: _entities[0],
+        toOneRelations: (Connection object) => [],
+        toManyRelations: (Connection object) => {},
+        getId: (Connection object) => object.obId,
+        setId: (Connection object, int id) {
+          object.obId = id;
+        },
+        objectToFB: (Connection object, fb.Builder fbb) {
+          final nameOffset = fbb.writeString(object.name);
+          final handleOffset = fbb.writeString(object.handle);
+          final idOffset = fbb.writeString(object.id);
+          final networkOffset = fbb.writeString(object.network);
+          final profileUrlOffset = fbb.writeString(object.profileUrl);
+          final avatarUrlOffset = fbb.writeString(object.avatarUrl);
+          fbb.startTable(10);
+          fbb.addInt64(0, object.obId);
+          fbb.addOffset(1, nameOffset);
+          fbb.addOffset(2, handleOffset);
+          fbb.addOffset(3, idOffset);
+          fbb.addOffset(4, networkOffset);
+          fbb.addOffset(5, profileUrlOffset);
+          fbb.addOffset(6, avatarUrlOffset);
+          fbb.addInt64(7, object.dbStatus);
+          fbb.addInt64(8, object.lastUpdateTime.millisecondsSinceEpoch);
+          fbb.finish(fbb.endTable());
+          return object.obId;
+        },
+        objectFromFB: (Store store, ByteData fbData) {
+          final buffer = fb.BufferContext(fbData);
+          final rootOffset = buffer.derefObject(0);
+
+          final object = Connection(
+              obId: const fb.Int64Reader().vTableGet(buffer, rootOffset, 4, 0),
+              name: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 6, ''),
+              handle: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 8, ''),
+              id: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 10, ''),
+              profileUrl: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 14, ''),
+              network: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 12, ''),
+              avatarUrl: const fb.StringReader(asciiOptimization: true)
+                  .vTableGet(buffer, rootOffset, 16, ''),
+              lastUpdateTime: DateTime.fromMillisecondsSinceEpoch(
+                  const fb.Int64Reader().vTableGet(buffer, rootOffset, 20, 0)))
+            ..dbStatus =
+                const fb.Int64Reader().vTableGet(buffer, rootOffset, 18, 0);
+
+          return object;
+        })
+  };
+
+  return ModelDefinition(model, bindings);
+}
+
+/// [Connection] entity fields to define ObjectBox queries.
+class Connection_ {
+  /// see [Connection.obId]
+  static final obId =
+      QueryIntegerProperty<Connection>(_entities[0].properties[0]);
+
+  /// see [Connection.name]
+  static final name =
+      QueryStringProperty<Connection>(_entities[0].properties[1]);
+
+  /// see [Connection.handle]
+  static final handle =
+      QueryStringProperty<Connection>(_entities[0].properties[2]);
+
+  /// see [Connection.id]
+  static final id = QueryStringProperty<Connection>(_entities[0].properties[3]);
+
+  /// see [Connection.network]
+  static final network =
+      QueryStringProperty<Connection>(_entities[0].properties[4]);
+
+  /// see [Connection.profileUrl]
+  static final profileUrl =
+      QueryStringProperty<Connection>(_entities[0].properties[5]);
+
+  /// see [Connection.avatarUrl]
+  static final avatarUrl =
+      QueryStringProperty<Connection>(_entities[0].properties[6]);
+
+  /// see [Connection.dbStatus]
+  static final dbStatus =
+      QueryIntegerProperty<Connection>(_entities[0].properties[7]);
+
+  /// see [Connection.lastUpdateTime]
+  static final lastUpdateTime =
+      QueryIntegerProperty<Connection>(_entities[0].properties[8]);
+}
diff --git a/lib/serializers/friendica/connection_friendica_extensions.dart b/lib/serializers/friendica/connection_friendica_extensions.dart
index fa3f19a..8440808 100644
--- a/lib/serializers/friendica/connection_friendica_extensions.dart
+++ b/lib/serializers/friendica/connection_friendica_extensions.dart
@@ -14,7 +14,7 @@ extension ConnectionFriendicaExtensions on Connection {
         status: status,
         name: name,
         id: id,
-        profileUrl: profileUrl,
+        profileUrl: profileUrl.toString(),
         network: network);
   }
 }
diff --git a/lib/serializers/mastodon/connection_mastodon_extensions.dart b/lib/serializers/mastodon/connection_mastodon_extensions.dart
index 95e537d..b135dee 100644
--- a/lib/serializers/mastodon/connection_mastodon_extensions.dart
+++ b/lib/serializers/mastodon/connection_mastodon_extensions.dart
@@ -23,9 +23,9 @@ extension ConnectionMastodonExtensions on Connection {
       name: name,
       id: id,
       handle: handle,
-      profileUrl: profileUrl,
+      profileUrl: profileUrl.toString(),
       network: network,
-      avatarUrl: avatar,
+      avatarUrl: avatar.toString(),
     );
   }
 }
diff --git a/lib/services/connections_manager.dart b/lib/services/connections_manager.dart
index 52b29e1..09e7472 100644
--- a/lib/services/connections_manager.dart
+++ b/lib/services/connections_manager.dart
@@ -134,7 +134,7 @@ class ConnectionsManager extends ChangeNotifier {
     );
   }
 
-  UnmodifiableListView<Connection> getMyContacts() {
+  List<Connection> getMyContacts() {
     return conRepo.getMyContacts();
   }
 
@@ -265,15 +265,6 @@ class ConnectionsManager extends ChangeNotifier {
     }).execErrorCast();
   }
 
-  Result<Connection, ExecError> getByProfileUrl(Uri url) {
-    return conRepo.getByProfileUrl(url.toString()).andThenSuccess((c) {
-      if (c.status == ConnectionStatus.unknown) {
-        _refreshConnection(c, true);
-      }
-      return c;
-    }).execErrorCast();
-  }
-
   Future<void> fullRefresh(Connection connection) async {
     await _updateMyGroups(false);
     await _refreshGroupListData(connection.id, false);
diff --git a/linux/flutter/generated_plugin_registrant.cc b/linux/flutter/generated_plugin_registrant.cc
index 241dc8b..c1e3da3 100644
--- a/linux/flutter/generated_plugin_registrant.cc
+++ b/linux/flutter/generated_plugin_registrant.cc
@@ -8,6 +8,7 @@
 
 #include <desktop_window/desktop_window_plugin.h>
 #include <flutter_secure_storage_linux/flutter_secure_storage_linux_plugin.h>
+#include <objectbox_flutter_libs/objectbox_flutter_libs_plugin.h>
 #include <url_launcher_linux/url_launcher_plugin.h>
 
 void fl_register_plugins(FlPluginRegistry* registry) {
@@ -17,6 +18,9 @@ void fl_register_plugins(FlPluginRegistry* registry) {
   g_autoptr(FlPluginRegistrar) flutter_secure_storage_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "FlutterSecureStorageLinuxPlugin");
   flutter_secure_storage_linux_plugin_register_with_registrar(flutter_secure_storage_linux_registrar);
+  g_autoptr(FlPluginRegistrar) objectbox_flutter_libs_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "ObjectboxFlutterLibsPlugin");
+  objectbox_flutter_libs_plugin_register_with_registrar(objectbox_flutter_libs_registrar);
   g_autoptr(FlPluginRegistrar) url_launcher_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "UrlLauncherPlugin");
   url_launcher_plugin_register_with_registrar(url_launcher_linux_registrar);
diff --git a/linux/flutter/generated_plugins.cmake b/linux/flutter/generated_plugins.cmake
index fd2ab75..28dcfea 100644
--- a/linux/flutter/generated_plugins.cmake
+++ b/linux/flutter/generated_plugins.cmake
@@ -5,6 +5,7 @@
 list(APPEND FLUTTER_PLUGIN_LIST
   desktop_window
   flutter_secure_storage_linux
+  objectbox_flutter_libs
   url_launcher_linux
 )
 
diff --git a/macos/Flutter/GeneratedPluginRegistrant.swift b/macos/Flutter/GeneratedPluginRegistrant.swift
index 808f3fb..a3accbe 100644
--- a/macos/Flutter/GeneratedPluginRegistrant.swift
+++ b/macos/Flutter/GeneratedPluginRegistrant.swift
@@ -7,6 +7,7 @@ import Foundation
 
 import desktop_window
 import flutter_secure_storage_macos
+import objectbox_flutter_libs
 import path_provider_macos
 import shared_preferences_foundation
 import sqflite
@@ -15,6 +16,7 @@ import url_launcher_macos
 func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   DesktopWindowPlugin.register(with: registry.registrar(forPlugin: "DesktopWindowPlugin"))
   FlutterSecureStoragePlugin.register(with: registry.registrar(forPlugin: "FlutterSecureStoragePlugin"))
+  ObjectboxFlutterLibsPlugin.register(with: registry.registrar(forPlugin: "ObjectboxFlutterLibsPlugin"))
   PathProviderPlugin.register(with: registry.registrar(forPlugin: "PathProviderPlugin"))
   SharedPreferencesPlugin.register(with: registry.registrar(forPlugin: "SharedPreferencesPlugin"))
   SqflitePlugin.register(with: registry.registrar(forPlugin: "SqflitePlugin"))
diff --git a/pubspec.lock b/pubspec.lock
index 40d01e6..b5c14b2 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -1,6 +1,20 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  _fe_analyzer_shared:
+    dependency: transitive
+    description:
+      name: _fe_analyzer_shared
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "50.0.0"
+  analyzer:
+    dependency: transitive
+    description:
+      name: analyzer
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.2.0"
   archive:
     dependency: transitive
     description:
@@ -29,6 +43,62 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  build:
+    dependency: transitive
+    description:
+      name: build
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.1"
+  build_config:
+    dependency: transitive
+    description:
+      name: build_config
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.1.1"
+  build_daemon:
+    dependency: transitive
+    description:
+      name: build_daemon
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.0"
+  build_resolvers:
+    dependency: transitive
+    description:
+      name: build_resolvers
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
+  build_runner:
+    dependency: "direct dev"
+    description:
+      name: build_runner
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.3"
+  build_runner_core:
+    dependency: transitive
+    description:
+      name: build_runner_core
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "7.2.7"
+  built_collection:
+    dependency: transitive
+    description:
+      name: built_collection
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "5.1.1"
+  built_value:
+    dependency: transitive
+    description:
+      name: built_value
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "8.4.3"
   cached_network_image:
     dependency: "direct main"
     description:
@@ -57,6 +127,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.1"
+  checked_yaml:
+    dependency: transitive
+    description:
+      name: checked_yaml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   clock:
     dependency: transitive
     description:
@@ -64,6 +141,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.1.1"
+  code_builder:
+    dependency: transitive
+    description:
+      name: code_builder
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.4.0"
   collection:
     dependency: transitive
     description:
@@ -92,6 +176,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.2"
+  cryptography:
+    dependency: transitive
+    description:
+      name: cryptography
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
   csslib:
     dependency: transitive
     description:
@@ -106,6 +197,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.5"
+  dart_style:
+    dependency: transitive
+    description:
+      name: dart_style
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.4"
   desktop_window:
     dependency: "direct main"
     description:
@@ -148,6 +246,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "5.2.5"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.1"
+  flat_buffers:
+    dependency: transitive
+    description:
+      name: flat_buffers
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -261,6 +373,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.9.1"
+  frontend_server_client:
+    dependency: transitive
+    description:
+      name: frontend_server_client
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.2.0"
   functional_listener:
     dependency: transitive
     description:
@@ -289,6 +408,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.1.4+2"
+  glob:
+    dependency: transitive
+    description:
+      name: glob
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.1"
   go_router:
     dependency: "direct main"
     description:
@@ -296,6 +422,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "5.2.4"
+  graphs:
+    dependency: transitive
+    description:
+      name: graphs
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.0"
   html:
     dependency: transitive
     description:
@@ -310,6 +443,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.13.5"
+  http_multi_server:
+    dependency: transitive
+    description:
+      name: http_multi_server
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.2.1"
   http_parser:
     dependency: transitive
     description:
@@ -359,6 +499,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.6.2"
+  io:
+    dependency: transitive
+    description:
+      name: io
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.3"
   js:
     dependency: transitive
     description:
@@ -366,6 +513,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.6.4"
+  json_annotation:
+    dependency: transitive
+    description:
+      name: json_annotation
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.7.0"
   lints:
     dependency: transitive
     description:
@@ -415,6 +569,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.4.1"
+  mime:
+    dependency: transitive
+    description:
+      name: mime
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.4"
   multi_trigger_autocomplete:
     dependency: "direct main"
     description:
@@ -436,6 +597,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.0.1"
+  objectbox:
+    dependency: "direct main"
+    description:
+      name: objectbox
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.1"
+  objectbox_flutter_libs:
+    dependency: "direct main"
+    description:
+      name: objectbox_flutter_libs
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.1"
+  objectbox_generator:
+    dependency: "direct dev"
+    description:
+      name: objectbox_generator
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.1"
   octo_image:
     dependency: transitive
     description:
@@ -443,6 +625,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.2"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
   path:
     dependency: "direct main"
     description:
@@ -451,7 +640,7 @@ packages:
     source: hosted
     version: "1.8.2"
   path_provider:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: path_provider
       url: "https://pub.dartlang.org"
@@ -534,6 +723,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.6.2"
+  pool:
+    dependency: transitive
+    description:
+      name: pool
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.5.1"
   process:
     dependency: transitive
     description:
@@ -548,6 +744,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "6.0.5"
+  pub_semver:
+    dependency: transitive
+    description:
+      name: pub_semver
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.3"
+  pubspec_parse:
+    dependency: transitive
+    description:
+      name: pubspec_parse
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.1"
   result_monad:
     dependency: "direct main"
     description:
@@ -618,11 +828,32 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.2"
+  shelf:
+    dependency: transitive
+    description:
+      name: shelf
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.4.0"
+  shelf_web_socket:
+    dependency: transitive
+    description:
+      name: shelf_web_socket
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.3"
   sky_engine:
     dependency: transitive
     description: flutter
     source: sdk
     version: "0.0.99"
+  source_gen:
+    dependency: transitive
+    description:
+      name: source_gen
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.2.6"
   source_span:
     dependency: transitive
     description:
@@ -665,6 +896,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  stream_transform:
+    dependency: transitive
+    description:
+      name: stream_transform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
@@ -707,6 +945,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.9.17"
+  timing:
+    dependency: transitive
+    description:
+      name: timing
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
   typed_data:
     dependency: transitive
     description:
@@ -819,6 +1064,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.13"
+  watcher:
+    dependency: transitive
+    description:
+      name: watcher
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.2"
+  web_socket_channel:
+    dependency: transitive
+    description:
+      name: web_socket_channel
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.3.0"
   win32:
     dependency: transitive
     description:
@@ -840,6 +1099,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "6.1.0"
+  yaml:
+    dependency: transitive
+    description:
+      name: yaml
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.1"
 sdks:
   dart: ">=2.18.2 <3.0.0"
   flutter: ">=3.3.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 03c4a6a..05b221d 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -39,11 +39,16 @@ dependencies:
   url_launcher: ^6.1.6
   uuid: ^3.0.6
   video_player: ^2.4.10
+  objectbox: ^1.7.1
+  objectbox_flutter_libs: ^1.7.1
+  path_provider: ^2.0.11
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
   flutter_lints: ^2.0.0
+  build_runner: ^2.3.3
+  objectbox_generator: ^1.7.1
 
 flutter:
   uses-material-design: true
diff --git a/windows/flutter/generated_plugin_registrant.cc b/windows/flutter/generated_plugin_registrant.cc
index f50c00b..4c170c8 100644
--- a/windows/flutter/generated_plugin_registrant.cc
+++ b/windows/flutter/generated_plugin_registrant.cc
@@ -8,6 +8,7 @@
 
 #include <desktop_window/desktop_window_plugin.h>
 #include <flutter_secure_storage_windows/flutter_secure_storage_windows_plugin.h>
+#include <objectbox_flutter_libs/objectbox_flutter_libs_plugin.h>
 #include <url_launcher_windows/url_launcher_windows.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
@@ -15,6 +16,8 @@ void RegisterPlugins(flutter::PluginRegistry* registry) {
       registry->GetRegistrarForPlugin("DesktopWindowPlugin"));
   FlutterSecureStorageWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FlutterSecureStorageWindowsPlugin"));
+  ObjectboxFlutterLibsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("ObjectboxFlutterLibsPlugin"));
   UrlLauncherWindowsRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("UrlLauncherWindows"));
 }
diff --git a/windows/flutter/generated_plugins.cmake b/windows/flutter/generated_plugins.cmake
index ddb2474..5a12988 100644
--- a/windows/flutter/generated_plugins.cmake
+++ b/windows/flutter/generated_plugins.cmake
@@ -5,6 +5,7 @@
 list(APPEND FLUTTER_PLUGIN_LIST
   desktop_window
   flutter_secure_storage_windows
+  objectbox_flutter_libs
   url_launcher_windows
 )