chore: init project

src/InboxIntel.Domain/Entities/MailThread.cs

@@ -0,0 +1,23 @@
+using InboxIntel.Domain.Common;
+
+namespace InboxIntel.Domain.Entities;
+
+/// <summary>
+/// A Gmail conversation thread, reconstructed from the Gmail threadId.
+/// </summary>
+public class MailThread : AuditableEntity
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public Guid UserId { get; set; }
+
+    /// <summary>Gmail-assigned thread id.</summary>
+    public string GmailThreadId { get; set; } = string.Empty;
+
+    public string? Subject { get; set; }
+    public string? Snippet { get; set; }
+    public int MessageCount { get; set; }
+    public DateTimeOffset? FirstMessageUtc { get; set; }
+    public DateTimeOffset? LastMessageUtc { get; set; }
+
+    public ICollection<Email> Emails { get; set; } = new List<Email>();
+}