feat(domain/application): add IncomingProtocol field to EmailAccount entity and account DTOs

src/core/DigitalData.MessagingService.Application/Common/Dto/EmailAccounts/EmailAccountDto.cs

@@ -1,3 +1,5 @@
+using DigitalData.MessagingService.Domain.Enums;
+
 namespace DigitalData.MessagingService.Application.Common.Dto.EmailAccounts;
 
 /// <summary>
@@ -53,4 +55,9 @@ public record EmailAccountDto
     public string? OAuth2ClientId { get; set; }
 
     public string? OAuth2TenantId { get; set; }
+
+    /// <summary>
+    /// The protocol used to receive (sync) incoming emails.
+    /// </summary>
+    public IncomingProtocol IncomingProtocol { get; set; } = IncomingProtocol.None;
 }

src/core/DigitalData.MessagingService.Application/Common/Dto/EmailAccounts/EmailAccountModificationDto.cs

@@ -1,3 +1,5 @@
+using DigitalData.MessagingService.Domain.Enums;
+
 namespace DigitalData.MessagingService.Application.Common.Dto.EmailAccounts;
 
 /// <summary>
@@ -56,4 +58,9 @@ public record EmailAccountModificationDto
     public string? OAuth2ClientSecret { get; set; }
 
     public string? OAuth2TenantId { get; set; }
+
+    /// <summary>
+    /// The protocol used to receive (sync) incoming emails.
+    /// </summary>
+    public IncomingProtocol IncomingProtocol { get; set; } = IncomingProtocol.None;
 }

src/core/DigitalData.MessagingService.Domain/Entities/EmailAccount.cs

@@ -1,5 +1,6 @@
 using System.ComponentModel.DataAnnotations;
 using System.ComponentModel.DataAnnotations.Schema;
+using DigitalData.MessagingService.Domain.Enums;
 
 namespace DigitalData.MessagingService.Domain.Entities;
 
@@ -113,4 +114,12 @@ public class EmailAccount
     [MaxLength(256)]
     [Column("OAUTH2_TENANT_ID", TypeName = "nvarchar(256)")]
     public string? OAuth2TenantId { get; set; }
+
+    /// <summary>
+    /// The protocol used to receive (sync) incoming emails.
+    /// When set to <see cref="IncomingProtocol.None"/>, this account is send-only and will be skipped by the sync worker.
+    /// Takes priority over the presence of <see cref="ImapServer"/> or <see cref="Pop3Server"/>.
+    /// </summary>
+    [Column("INCOMING_PROTOCOL", TypeName = "int")]
+    public IncomingProtocol IncomingProtocol { get; set; } = IncomingProtocol.None;
 }