Refactor upgrade and verify commands.

database/migrations/2019_03_03_081750_changes_for_v480.php

@@ -1,26 +0,0 @@
-<?php
-
-use Illuminate\Database\Migrations\Migration;
-
-class ChangesForV480 extends Migration
-{
-    /**
-     * Reverse the migrations.
-     *
-     * @return void
-     */
-    public function down(): void
-    {
-        //
-    }
-
-    /**
-     * Run the migrations.
-     *
-     * @return void
-     */
-    public function up(): void
-    {
-
-    }
-}

database/migrations/2019_03_22_183214_changes_for_v480.php

@@ -0,0 +1,54 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+/**
+ * Class ChangesForV480
+ */
+class ChangesForV480 extends Migration
+{
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down(): void
+    {
+        Schema::table(
+            'transaction_journals',
+            function (Blueprint $table) {
+                // drop transaction_group_id + foreign key.
+                // cannot drop foreign keys in SQLite:
+                if ('sqlite' !== config('database.default')) {
+                    $table->dropForeign('transaction_journals_transaction_group_id_foreign');
+                }
+                $table->dropColumn('transaction_group_id');
+            }
+        );
+    }
+
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up(): void
+    {
+
+        Schema::table(
+            'transaction_journals',
+            function (Blueprint $table) {
+
+                $table->integer('transaction_currency_id', false, true)->nullable()->change();
+
+                // add column "group_id" after "transaction_type_id"
+                $table->integer('transaction_group_id', false, true)
+                      ->nullable()->default(null)->after('transaction_type_id');
+
+                // add foreign key for "transaction_group_id"
+                $table->foreign('transaction_group_id')->references('id')->on('transaction_groups')->onDelete('cascade');
+            }
+        );
+    }
+}