[Persistence] Add support for pinned messages

Signed-off-by: Sahil Kumar <[email protected]>

packages/stream_chat_persistence/lib/src/entity/entity.dart

@@ -1,5 +1,6 @@
 export 'channels.dart';
 export 'messages.dart';
+export 'pinned_messages.dart';
 export 'reactions.dart';
 export 'users.dart';
 export 'members.dart';

packages/stream_chat_persistence/lib/src/entity/messages.dart

@@ -64,6 +64,18 @@ class Messages extends Table {
   /// Id of the User who sent the message
   TextColumn get userId => text().nullable()();
 
+  /// Whether the message is pinned or not
+  BoolColumn get pinned => boolean().withDefault(const Constant(false))();
+
+  /// The DateTime at which the message was pinned
+  DateTimeColumn get pinnedAt => dateTime().nullable()();
+
+  /// The DateTime on which the message pin expires
+  DateTimeColumn get pinExpires => dateTime().nullable()();
+
+  /// Id of the User who pinned the message
+  TextColumn get pinnedByUserId => text().nullable()();
+
   /// The channel cid of which this message is part of
   TextColumn get channelCid => text().nullable().customConstraint(
       'NULLABLE REFERENCES channels(cid) ON DELETE CASCADE')();

packages/stream_chat_persistence/lib/src/entity/pinned_messages.dart

@@ -0,0 +1,7 @@
+import 'package:moor/moor.dart';
+
+import 'messages.dart';
+
+/// Represents a [PinnedMessages] table in [MoorChatDatabase].
+@DataClassName('PinnedMessageEntity')
+class PinnedMessages extends Messages {}