Use HWIDs for bans.

Content.Server.Database/Migrations/Postgres/20210321230012_HWID.cs

@@ -0,0 +1,62 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+namespace Content.Server.Database.Migrations.Postgres
+{
+    public partial class HWID : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropCheckConstraint(
+                name: "HaveEitherAddressOrUserId",
+                table: "server_ban");
+
+            migrationBuilder.AddColumn<byte[]>(
+                name: "hwid",
+                table: "server_ban",
+                type: "bytea",
+                nullable: true);
+
+            migrationBuilder.AddColumn<byte[]>(
+                name: "last_seen_hwid",
+                table: "player",
+                type: "bytea",
+                nullable: true);
+
+            migrationBuilder.AddColumn<byte[]>(
+                name: "hwid",
+                table: "connection_log",
+                type: "bytea",
+                nullable: true);
+
+            migrationBuilder.AddCheckConstraint(
+                name: "HaveEitherAddressOrUserIdOrHWId",
+                table: "server_ban",
+                sql: "address IS NOT NULL OR user_id IS NOT NULL OR hwid IS NOT NULL");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropCheckConstraint(
+                name: "HaveEitherAddressOrUserIdOrHWId",
+                table: "server_ban");
+
+            migrationBuilder.DropColumn(
+                name: "hwid",
+                table: "server_ban");
+
+            migrationBuilder.DropColumn(
+                name: "last_seen_hwid",
+                table: "player");
+
+            migrationBuilder.DropColumn(
+                name: "hwid",
+                table: "connection_log");
+
+            migrationBuilder.AddCheckConstraint(
+                name: "HaveEitherAddressOrUserId",
+                table: "server_ban",
+                sql: "address IS NOT NULL OR user_id IS NOT NULL");
+        }
+    }
+}