Redo database migrations for pgsql

database/migrations/0215-create_costs.php

@@ -0,0 +1,45 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+		Schema::create('costs', function (Blueprint $table)
+		{
+			$table->id();
+			$table->timestamps();
+			$table->integer('site_id')->unsigned();
+			$table->boolean('active')->default(false);
+
+			$table->date('billed_at');
+			$table->string('invoice_num')->nullable();
+
+			$table->foreign(['site_id'])->references(['id'])->on('sites');
+
+			$table->integer('supplier_id')->unsigned();
+			$table->foreign(['supplier_id'])->references(['id'])->on('suppliers');
+
+			$table->unique(['id','site_id']);
+		});
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+
+		Schema::dropIfExists('costs');
+    }
+};