MailWindow: Add feature to address members with ancmts on specific day

Elwig/Models/Entities/DeliverySchedule.cs

@@ -29,6 +29,9 @@ namespace Elwig.Models.Entities {
         [Column("description")]
         public required string Description { get; set; }
 
+        [NotMapped]
+        public string Identifier => $"{Date:dd.MM.} - {ZwstId} - {Description}";
+
         [Column("max_weight")]
         public int? MaxWeight { get; set; }
         [NotMapped]

Elwig/Models/Entities/Member.cs

@@ -167,6 +167,9 @@ namespace Elwig.Models.Entities {
         [InverseProperty(nameof(BillingAddr.Member))]
         public virtual BillingAddr? BillingAddress { get; private set; }
 
+        [InverseProperty(nameof(Delivery.Member))]
+        public virtual ICollection<DeliveryAncmt> Announcements { get; private set; } = null!;
+
         [InverseProperty(nameof(Delivery.Member))]
         public virtual ICollection<Delivery> Deliveries { get; private set; } = null!;