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lib/pkp/classes/migration/install/NotesMigration.php

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+<?php
+
+/**
+ * @file classes/migration/install/NotesMigration.php
+ *
+ * Copyright (c) 2014-2021 Simon Fraser University
+ * Copyright (c) 2000-2021 John Willinsky
+ * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
+ *
+ * @class NotesMigration
+ *
+ * @brief Describe database table structures.
+ */
+
+namespace PKP\migration\install;
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class NotesMigration extends \PKP\migration\Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('notes', function (Blueprint $table) {
+            $table->comment('Notes allow users to annotate associated entities, such as submissions.');
+            $table->bigInteger('note_id')->autoIncrement();
+            $table->bigInteger('assoc_type');
+            $table->bigInteger('assoc_id');
+
+            $table->bigInteger('user_id');
+            $table->foreign('user_id')->references('user_id')->on('users')->onDelete('cascade');
+            $table->index(['user_id'], 'notes_user_id');
+
+            $table->datetime('date_created');
+            $table->datetime('date_modified')->nullable();
+            $table->string('title', 255)->nullable();
+            $table->text('contents')->nullable();
+
+            $table->index(['assoc_type', 'assoc_id'], 'notes_assoc');
+        });
+    }
+
+    /**
+     * Reverse the migration.
+     */
+    public function down(): void
+    {
+        Schema::drop('notes');
+    }
+}