Added functionality to the database for a WhoWas feature that can say when a user was last in chat

KfChatDotNetBot/Migrations/20250413180751_UserWhoWas.cs

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+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace KfChatDotNetBot.Migrations
+{
+    /// <inheritdoc />
+    public partial class UserWhoWas : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.CreateTable(
+                name: "UsersWhoWere",
+                columns: table => new
+                {
+                    Id = table.Column<int>(type: "INTEGER", nullable: false)
+                        .Annotation("Sqlite:Autoincrement", true),
+                    UserId = table.Column<int>(type: "INTEGER", nullable: false),
+                    FirstOccurence = table.Column<DateTimeOffset>(type: "TEXT", nullable: false),
+                    LatestOccurence = table.Column<DateTimeOffset>(type: "TEXT", nullable: false),
+                    ActivityType = table.Column<int>(type: "INTEGER", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_UsersWhoWere", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_UsersWhoWere_Users_UserId",
+                        column: x => x.UserId,
+                        principalTable: "Users",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateIndex(
+                name: "IX_UsersWhoWere_UserId",
+                table: "UsersWhoWere",
+                column: "UserId");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropTable(
+                name: "UsersWhoWere");
+        }
+    }
+}