Mail queues.

Wino.Core.Domain/Entities/Mail/MailItemQueue.cs

@@ -0,0 +1,19 @@
+using System;
+using SQLite;
+
+namespace Wino.Core.Domain.Entities.Mail;
+
+public class MailItemQueue
+{
+    [PrimaryKey]
+    public Guid Id { get; set; }
+    public Guid AccountId { get; set; }
+    public string RemoteServerId { get; set; }
+    public bool IsProcessed { get; set; }
+    public int FailedCount { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? ProcessedAt { get; set; }
+
+    public bool IsRecent() => (DateTime.UtcNow - CreatedAt).TotalDays <= 7;
+    public bool ShouldDelete() => IsProcessed || FailedCount >= 30;
+}

Wino.Core.Domain/Entities/Shared/MailAccount.cs

@@ -33,6 +33,11 @@ public class MailAccount
     /// </summary>
     public MailProviderType ProviderType { get; set; }
 
+    /// <summary>
+    /// Gets or sets the initial mail sync status for the account.
+    /// </summary>
+    public InitialSynchronizationStatus SynchronizationStatus { get; set; }
+
     /// <summary>
     /// For tracking mail change delta.
     /// Gmail  : historyId

Wino.Core.Domain/Enums/InitialSynchronizationStatus.cs

@@ -0,0 +1,8 @@
+namespace Wino.Core.Domain.Enums;
+
+public enum InitialSynchronizationStatus
+{
+    None,
+    IdsFetched,
+    Completed
+}

Wino.Core.Domain/Interfaces/IMailService.cs

@@ -162,4 +162,9 @@ public interface IMailService
     /// <param name="onlineArchiveMailIds">Retrieved MailCopy ids from search result.</param>
     /// <returns>Result model that contains added and removed mail copy ids.</returns>
     Task<GmailArchiveComparisonResult> GetGmailArchiveComparisonResultAsync(Guid archiveFolderId, List<string> onlineArchiveMailIds);
+    Task ClearMailItemQueueAsync(Guid accountId);
+    Task AddMailItemQueueItemsAsync(IEnumerable<MailItemQueue> queueItems);
+    Task<int> GetMailItemQueueCountAsync(Guid accountId);
+    Task<List<MailItemQueue>> GetMailItemQueueAsync(Guid accountId, int take);
+    Task UpdateMailItemQueueAsync(IEnumerable<MailItemQueue> queueItems);
 }