ok no i take it back, we do need a rememberer?

send 2 messages - it'll pull out a channel and complain it's already been attached.

Migrations/20250204004906_cascade.Designer.cs

@@ -0,0 +1,271 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
+using vassago.Models;
+
+#nullable disable
+
+namespace vassago.Migrations
+{
+    [DbContext(typeof(ChattingContext))]
+    [Migration("20250204004906_cascade")]
+    partial class cascade
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "7.0.5")
+                .HasAnnotation("Relational:MaxIdentifierLength", 63);
+
+            NpgsqlModelBuilderExtensions.UseIdentityByDefaultColumns(modelBuilder);
+
+            modelBuilder.Entity("vassago.Models.Account", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("DisplayName")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ExternalId")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("IsBot")
+                        .HasColumnType("boolean");
+
+                    b.Property<Guid?>("IsUserId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Protocol")
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("SeenInChannelId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Username")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("IsUserId");
+
+                    b.HasIndex("SeenInChannelId");
+
+                    b.ToTable("Accounts");
+                });
+
+            modelBuilder.Entity("vassago.Models.Attachment", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<byte[]>("Content")
+                        .HasColumnType("bytea");
+
+                    b.Property<string>("ContentType")
+                        .HasColumnType("text");
+
+                    b.Property<string>("Description")
+                        .HasColumnType("text");
+
+                    b.Property<decimal?>("ExternalId")
+                        .HasColumnType("numeric(20,0)");
+
+                    b.Property<string>("Filename")
+                        .HasColumnType("text");
+
+                    b.Property<Guid?>("MessageId")
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("Size")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("Source")
+                        .HasColumnType("text");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MessageId");
+
+                    b.ToTable("Attachments");
+                });
+
+            modelBuilder.Entity("vassago.Models.Channel", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<int>("ChannelType")
+                        .HasColumnType("integer");
+
+                    b.Property<string>("DisplayName")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ExternalId")
+                        .HasColumnType("text");
+
+                    b.Property<int?>("LewdnessFilterLevel")
+                        .HasColumnType("integer");
+
+                    b.Property<bool?>("LinksAllowed")
+                        .HasColumnType("boolean");
+
+                    b.Property<decimal?>("MaxAttachmentBytes")
+                        .HasColumnType("numeric(20,0)");
+
+                    b.Property<long?>("MaxTextChars")
+                        .HasColumnType("bigint");
+
+                    b.Property<int?>("MeannessFilterLevel")
+                        .HasColumnType("integer");
+
+                    b.Property<Guid?>("ParentChannelId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Protocol")
+                        .HasColumnType("text");
+
+                    b.Property<bool?>("ReactionsPossible")
+                        .HasColumnType("boolean");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("ParentChannelId");
+
+                    b.ToTable("Channels");
+                });
+
+            modelBuilder.Entity("vassago.Models.Message", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<bool>("ActedOn")
+                        .HasColumnType("boolean");
+
+                    b.Property<Guid?>("AuthorId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Guid?>("ChannelId")
+                        .HasColumnType("uuid");
+
+                    b.Property<string>("Content")
+                        .HasColumnType("text");
+
+                    b.Property<string>("ExternalId")
+                        .HasColumnType("text");
+
+                    b.Property<bool>("MentionsMe")
+                        .HasColumnType("boolean");
+
+                    b.Property<string>("Protocol")
+                        .HasColumnType("text");
+
+                    b.Property<DateTimeOffset>("Timestamp")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AuthorId");
+
+                    b.HasIndex("ChannelId");
+
+                    b.ToTable("Messages");
+                });
+
+            modelBuilder.Entity("vassago.Models.User", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("Users");
+                });
+
+            modelBuilder.Entity("vassago.Models.Account", b =>
+                {
+                    b.HasOne("vassago.Models.User", "IsUser")
+                        .WithMany("Accounts")
+                        .HasForeignKey("IsUserId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.HasOne("vassago.Models.Channel", "SeenInChannel")
+                        .WithMany("Users")
+                        .HasForeignKey("SeenInChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.Navigation("IsUser");
+
+                    b.Navigation("SeenInChannel");
+                });
+
+            modelBuilder.Entity("vassago.Models.Attachment", b =>
+                {
+                    b.HasOne("vassago.Models.Message", "Message")
+                        .WithMany("Attachments")
+                        .HasForeignKey("MessageId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.Navigation("Message");
+                });
+
+            modelBuilder.Entity("vassago.Models.Channel", b =>
+                {
+                    b.HasOne("vassago.Models.Channel", "ParentChannel")
+                        .WithMany("SubChannels")
+                        .HasForeignKey("ParentChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.Navigation("ParentChannel");
+                });
+
+            modelBuilder.Entity("vassago.Models.Message", b =>
+                {
+                    b.HasOne("vassago.Models.Account", "Author")
+                        .WithMany()
+                        .HasForeignKey("AuthorId");
+
+                    b.HasOne("vassago.Models.Channel", "Channel")
+                        .WithMany("Messages")
+                        .HasForeignKey("ChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
+
+                    b.Navigation("Author");
+
+                    b.Navigation("Channel");
+                });
+
+            modelBuilder.Entity("vassago.Models.Channel", b =>
+                {
+                    b.Navigation("Messages");
+
+                    b.Navigation("SubChannels");
+
+                    b.Navigation("Users");
+                });
+
+            modelBuilder.Entity("vassago.Models.Message", b =>
+                {
+                    b.Navigation("Attachments");
+                });
+
+            modelBuilder.Entity("vassago.Models.User", b =>
+                {
+                    b.Navigation("Accounts");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}

Migrations/20250204004906_cascade.cs

@@ -0,0 +1,133 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace vassago.Migrations
+{
+    /// <inheritdoc />
+    public partial class cascade : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Accounts_Channels_SeenInChannelId",
+                table: "Accounts");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Accounts_Users_IsUserId",
+                table: "Accounts");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Attachments_Messages_MessageId",
+                table: "Attachments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Channels_Channels_ParentChannelId",
+                table: "Channels");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Messages_Channels_ChannelId",
+                table: "Messages");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Accounts_Channels_SeenInChannelId",
+                table: "Accounts",
+                column: "SeenInChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Accounts_Users_IsUserId",
+                table: "Accounts",
+                column: "IsUserId",
+                principalTable: "Users",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Attachments_Messages_MessageId",
+                table: "Attachments",
+                column: "MessageId",
+                principalTable: "Messages",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Channels_Channels_ParentChannelId",
+                table: "Channels",
+                column: "ParentChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Messages_Channels_ChannelId",
+                table: "Messages",
+                column: "ChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_Accounts_Channels_SeenInChannelId",
+                table: "Accounts");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Accounts_Users_IsUserId",
+                table: "Accounts");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Attachments_Messages_MessageId",
+                table: "Attachments");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Channels_Channels_ParentChannelId",
+                table: "Channels");
+
+            migrationBuilder.DropForeignKey(
+                name: "FK_Messages_Channels_ChannelId",
+                table: "Messages");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Accounts_Channels_SeenInChannelId",
+                table: "Accounts",
+                column: "SeenInChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Accounts_Users_IsUserId",
+                table: "Accounts",
+                column: "IsUserId",
+                principalTable: "Users",
+                principalColumn: "Id");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Attachments_Messages_MessageId",
+                table: "Attachments",
+                column: "MessageId",
+                principalTable: "Messages",
+                principalColumn: "Id");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Channels_Channels_ParentChannelId",
+                table: "Channels",
+                column: "ParentChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_Messages_Channels_ChannelId",
+                table: "Messages",
+                column: "ChannelId",
+                principalTable: "Channels",
+                principalColumn: "Id");
+        }
+    }
+}

Migrations/ChattingContextModelSnapshot.cs

@@ -195,11 +195,13 @@ namespace vassago.Migrations
                 {
                     b.HasOne("vassago.Models.User", "IsUser")
                         .WithMany("Accounts")
-                        .HasForeignKey("IsUserId");
+                        .HasForeignKey("IsUserId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.HasOne("vassago.Models.Channel", "SeenInChannel")
                         .WithMany("Users")
-                        .HasForeignKey("SeenInChannelId");
+                        .HasForeignKey("SeenInChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.Navigation("IsUser");
 
@@ -210,7 +212,8 @@ namespace vassago.Migrations
                 {
                     b.HasOne("vassago.Models.Message", "Message")
                         .WithMany("Attachments")
-                        .HasForeignKey("MessageId");
+                        .HasForeignKey("MessageId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.Navigation("Message");
                 });
@@ -219,7 +222,8 @@ namespace vassago.Migrations
                 {
                     b.HasOne("vassago.Models.Channel", "ParentChannel")
                         .WithMany("SubChannels")
-                        .HasForeignKey("ParentChannelId");
+                        .HasForeignKey("ParentChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.Navigation("ParentChannel");
                 });
@@ -232,7 +236,8 @@ namespace vassago.Migrations
 
                     b.HasOne("vassago.Models.Channel", "Channel")
                         .WithMany("Messages")
-                        .HasForeignKey("ChannelId");
+                        .HasForeignKey("ChannelId")
+                        .OnDelete(DeleteBehavior.Cascade);
 
                     b.Navigation("Author");
 

Models/Channel.cs

@@ -6,6 +6,7 @@ using System.ComponentModel.DataAnnotations.Schema;
 using System.Reflection;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Components.Web;
+using Microsoft.EntityFrameworkCore;
 using static vassago.Models.Enumerations;
 
 public class Channel
@@ -14,10 +15,13 @@ public class Channel
     public Guid Id { get; set; }
     public string ExternalId { get; set; }
     public string DisplayName { get; set; }
+    [DeleteBehavior(DeleteBehavior.Cascade)]
     public List<Channel> SubChannels { get; set; }
     public Channel ParentChannel { get; set; }
     public string Protocol { get; set; }
+    [DeleteBehavior(DeleteBehavior.Cascade)]
     public List<Message> Messages { get; set; }
+    [DeleteBehavior(DeleteBehavior.Cascade)]
     public List<Account> Users { get; set; }
     public ChannelType ChannelType {get; set; }
 

Models/Message.cs

@@ -6,6 +6,7 @@ using System.ComponentModel.DataAnnotations.Schema;
 using System.Reflection;
 using System.Threading.Tasks;
 using Discord.WebSocket;
+using Microsoft.EntityFrameworkCore;
 
 public class Message
 {
@@ -17,6 +18,7 @@ public class Message
     public bool MentionsMe { get; set; }
     public DateTimeOffset Timestamp { get; set; }
     public bool ActedOn { get; set; }
+    [DeleteBehavior(DeleteBehavior.Cascade)]
     public List<Attachment> Attachments { get; set; }
     public Account Author { get; set; }
     public Channel Channel { get; set; }

Models/User.cs

@@ -4,11 +4,13 @@ using System;
 using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations.Schema;
 using System.Reflection;
+using Microsoft.EntityFrameworkCore;
 
 public class User
 {
     [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
     public Guid Id { get; set; }
+    [DeleteBehavior(DeleteBehavior.Cascade)]
     public List<Account> Accounts { get; set; }
 
     //if I ever get lots and lots of tags, or some automatic way to register a feature's arbitrary tags, then I can move this off.

ProtocolInterfaces/DiscordInterface/DiscordInterface.cs

@@ -234,7 +234,7 @@ public class DiscordInterface
 
         m.Reply = (t) => { return dMessage.ReplyAsync(t); };
         m.React = (e) => { return attemptReact(dMessage, e); };
-        db.SaveChangesAsync();
+        db.SaveChanges();
         return m;
     }
     internal Channel UpsertChannel(IMessageChannel channel)
@@ -255,7 +255,7 @@ public class DiscordInterface
         c.Protocol = PROTOCOL;
         if (channel is IGuildChannel)
         {
-            c.ParentChannel = UpsertChannel((channel as IGuildChannel).Guild);
+            c.ParentChannel = UpsertChannel((channel as IGuildChannel).Guild, db);
             c.ParentChannel.SubChannels.Add(c);
         }
         else if (channel is IPrivateChannel)
@@ -277,19 +277,25 @@ public class DiscordInterface
                 c.DisplayName = "DM: " + (channel as IPrivateChannel).Recipients?.FirstOrDefault(u => u.Id != client.CurrentUser.Id).Username;
                 break;
         }
-        db.SaveChangesAsync();
+        db.SaveChanges();
         return c;
     }
-    internal Channel UpsertChannel(IGuild channel)
+    internal Channel UpsertChannel(IGuild channel, ChattingContext db = null)
     {
-        var db = new ChattingContext();
+        db = db ?? new ChattingContext();
+        Console.WriteLine($"upserting *guild*: {channel.Id}");
         Channel c = db.Channels.FirstOrDefault(ci => ci.ExternalId == channel.Id.ToString() && ci.Protocol == PROTOCOL);
         if (c == null)
         {
+            Console.WriteLine($"don't have one already. Creating.");
             c = new Channel();
             db.Channels.Add(c);
             Console.WriteLine($"upserting channel {channel.Name} from discord, have to create a new one in the DB");
         }
+        else
+        {
+            Console.WriteLine($"found one.");
+        }
 
         c.DisplayName = channel.Name;
         c.ExternalId = channel.Id.ToString();
@@ -307,7 +313,6 @@ public class DiscordInterface
     }
     internal Account UpsertAccount(IUser user, Channel inChannel)
     {
-
         var db = new ChattingContext();
         var acc = db.Accounts.FirstOrDefault(ui => ui.ExternalId == user.Id.ToString() && ui.SeenInChannel.Id == inChannel.Id);
         if (acc == null)

appsettings.json

@@ -2,7 +2,8 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning"
+      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.EntityFrameworkCore": "None"
     }
   },
   "AllowedHosts": "*",