refactor: unify session status model

Fixes #5

src/GmRelay.Bot/Features/Sessions/CreateSession/CancelSessionHandler.cs

@@ -48,7 +48,10 @@ public sealed class CancelSessionHandler(
         }
 
         // 2. Отменяем сессию
-        await connection.ExecuteAsync("UPDATE sessions SET status = 'Cancelled' WHERE id = @Id", new { Id = command.SessionId }, transaction);
+        await connection.ExecuteAsync(
+            "UPDATE sessions SET status = @Status WHERE id = @Id",
+            new { Id = command.SessionId, Status = SessionStatus.Cancelled },
+            transaction);
 
         // 3. Загружаем весь батч для перерисовки
         var batchSessions = await connection.QueryAsync<SessionBatchDto>(

src/GmRelay.Bot/Features/Sessions/CreateSession/CreateSessionHandler.cs

@@ -1,4 +1,5 @@
 using Dapper;
+using GmRelay.Shared.Domain;
 using GmRelay.Shared.Rendering;
 using Npgsql;
 using Telegram.Bot;
@@ -93,7 +94,7 @@ public sealed class CreateSessionHandler(
                 var sessionId = await connection.ExecuteScalarAsync<Guid>(
                     """
                     INSERT INTO sessions (batch_id, group_id, title, join_link, scheduled_at, status, thread_id)
-                    VALUES (@BatchId, @GroupId, @Title, @Link, @ScheduledAt, 'Planned', @ThreadId)
+                    VALUES (@BatchId, @GroupId, @Title, @Link, @ScheduledAt, @Status, @ThreadId)
                     RETURNING id;
                     """,
                     new
@@ -103,11 +104,12 @@ public sealed class CreateSessionHandler(
                         Title = title,
                         Link = link,
                         ScheduledAt = scheduledAt,
-                        ThreadId = messageThreadId
+                        ThreadId = messageThreadId,
+                        Status = SessionStatus.Planned
                     },
                     transaction);
 
-                sessions.Add(new SessionBatchDto(sessionId, scheduledAt.UtcDateTime, "Planned"));
+                sessions.Add(new SessionBatchDto(sessionId, scheduledAt.UtcDateTime, SessionStatus.Planned));
             }
 
             await transaction.CommitAsync(cancellationToken);

src/GmRelay.Bot/Features/Sessions/ExportCalendar/ExportCalendarHandler.cs

@@ -1,5 +1,6 @@
 using System.Text;
 using Dapper;
+using GmRelay.Shared.Domain;
 using Npgsql;
 using Telegram.Bot;
 using Telegram.Bot.Types;
@@ -21,10 +22,10 @@ public sealed class ExportCalendarHandler(
               FROM sessions s
               JOIN game_groups g ON s.group_id = g.id
               WHERE g.telegram_chat_id = @ChatId 
-                AND s.status = 'Planned' 
+                AND s.status = @Planned
                 AND s.scheduled_at > NOW()
               ORDER BY s.scheduled_at ASC",
-            new { ChatId = message.Chat.Id });
+            new { ChatId = message.Chat.Id, Planned = SessionStatus.Planned });
 
         var sessionsList = sessions.ToList();
 

src/GmRelay.Bot/Features/Sessions/ListSessions/DeleteSessionHandler.cs

@@ -80,10 +80,10 @@ public sealed class DeleteSessionHandler(
               FROM sessions s
               JOIN game_groups g ON s.group_id = g.id
               LEFT JOIN session_participants sp ON s.id = sp.session_id
-              WHERE g.telegram_chat_id = @ChatId AND s.status != 'Cancelled' AND s.scheduled_at > NOW()
+              WHERE g.telegram_chat_id = @ChatId AND s.status != @Cancelled AND s.scheduled_at > NOW()
               GROUP BY s.id, s.title, s.scheduled_at, s.status, g.gm_telegram_id
               ORDER BY s.scheduled_at ASC",
-            new { ChatId = command.ChatId });
+            new { ChatId = command.ChatId, Cancelled = SessionStatus.Cancelled });
 
         var sessionsList = sessions.ToList();
 

src/GmRelay.Bot/Features/Sessions/ListSessions/ListSessionsHandler.cs

@@ -23,10 +23,10 @@ public sealed class ListSessionsHandler(
               FROM sessions s
               JOIN game_groups g ON s.group_id = g.id
               LEFT JOIN session_participants sp ON s.id = sp.session_id
-              WHERE g.telegram_chat_id = @ChatId AND s.status != 'Cancelled' AND s.scheduled_at > NOW()
+              WHERE g.telegram_chat_id = @ChatId AND s.status != @Cancelled AND s.scheduled_at > NOW()
               GROUP BY s.id, s.title, s.scheduled_at, s.status, g.gm_telegram_id
               ORDER BY s.scheduled_at ASC",
-            new { ChatId = message.Chat.Id });
+            new { ChatId = message.Chat.Id, Cancelled = SessionStatus.Cancelled });
 
         var sessionsList = sessions.ToList();
 

src/GmRelay.Bot/Features/Sessions/RescheduleSession/HandleRescheduleTimeInputHandler.cs

@@ -154,10 +154,10 @@ public sealed class HandleRescheduleTimeInputHandler(
 
         await connection.ExecuteAsync(
             """
-            UPDATE sessions SET scheduled_at = @NewTime, status = 'Planned', updated_at = now()
+            UPDATE sessions SET scheduled_at = @NewTime, status = @Status, updated_at = now()
             WHERE id = @SessionId
             """,
-            new { NewTime = newTime, proposal.SessionId },
+            new { NewTime = newTime, proposal.SessionId, Status = SessionStatus.Planned },
             transaction);
 
         await connection.ExecuteAsync(

src/GmRelay.Bot/Features/Sessions/RescheduleSession/HandleRescheduleVoteHandler.cs

@@ -165,13 +165,13 @@ public sealed class HandleRescheduleVoteHandler(
                 """
                 UPDATE sessions
                 SET scheduled_at = @NewTime,
-                    status = 'Planned',
+                    status = @Status,
                     confirmation_message_id = NULL,
                     link_message_id = NULL,
                     updated_at = now()
                 WHERE id = @SessionId
                 """,
-                new { NewTime = newTime, proposal.SessionId },
+                new { NewTime = newTime, proposal.SessionId, Status = SessionStatus.Planned },
                 transaction);
 
             await connection.ExecuteAsync(

src/GmRelay.Bot/Features/Sessions/RescheduleSession/InitiateRescheduleHandler.cs

@@ -1,4 +1,5 @@
 using Dapper;
+using GmRelay.Shared.Domain;
 using Npgsql;
 using Telegram.Bot;
 
@@ -39,9 +40,9 @@ public sealed class InitiateRescheduleHandler(
             SELECT s.title AS Title, g.gm_telegram_id AS GmId
             FROM sessions s
             JOIN game_groups g ON s.group_id = g.id
-            WHERE s.id = @SessionId AND s.status != 'Cancelled'
+            WHERE s.id = @SessionId AND s.status != @Cancelled
             """,
-            new { command.SessionId });
+            new { command.SessionId, Cancelled = SessionStatus.Cancelled });
 
         if (session is null)
         {