Added a generic interface for retrieving images. Where multiple images exist, it'll retrieve the least seen. If there are sufficient images to work with, it'll randomly pick from a subset of the least seen to make it less predictable what's going to show up.

KfChatDotNetBot/Migrations/20250207015155_Images.cs

@@ -0,0 +1,48 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace KfChatDotNetBot.Migrations
+{
+    /// <inheritdoc />
+    public partial class Images : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "ValueType",
+                table: "Settings",
+                type: "INTEGER",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateTable(
+                name: "Images",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    Key = table.Column<string>(type: "TEXT", nullable: false),
+                    Url = table.Column<string>(type: "TEXT", nullable: false),
+                    LastSeen = table.Column<DateTimeOffset>(type: "TEXT", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Images", x => x.Id);
+                });
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "Images");
+
+            migrationBuilder.DropColumn(
+                name: "ValueType",
+                table: "Settings");
+        }
+    }
+}