🐛 Fix some bugs that introduced in previous changes

DysonNetwork.Drive/Migrations/20260110142132_NullableReplicaPoolId.cs

@@ -0,0 +1,60 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace DysonNetwork.Drive.Migrations
+{
+    /// <inheritdoc />
+    public partial class NullableReplicaPoolId : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "fk_file_replicas_pools_pool_id",
+                table: "file_replicas");
+
+            migrationBuilder.AlterColumn<Guid>(
+                name: "pool_id",
+                table: "file_replicas",
+                type: "uuid",
+                nullable: true,
+                oldClrType: typeof(Guid),
+                oldType: "uuid");
+
+            migrationBuilder.AddForeignKey(
+                name: "fk_file_replicas_pools_pool_id",
+                table: "file_replicas",
+                column: "pool_id",
+                principalTable: "pools",
+                principalColumn: "id");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "fk_file_replicas_pools_pool_id",
+                table: "file_replicas");
+
+            migrationBuilder.AlterColumn<Guid>(
+                name: "pool_id",
+                table: "file_replicas",
+                type: "uuid",
+                nullable: false,
+                defaultValue: new Guid("00000000-0000-0000-0000-000000000000"),
+                oldClrType: typeof(Guid),
+                oldType: "uuid",
+                oldNullable: true);
+
+            migrationBuilder.AddForeignKey(
+                name: "fk_file_replicas_pools_pool_id",
+                table: "file_replicas",
+                column: "pool_id",
+                principalTable: "pools",
+                principalColumn: "id",
+                onDelete: ReferentialAction.Cascade);
+        }
+    }
+}