Fix error spam in logs due to missing cron month

database/migrations/2021_03_21_104718_force_cron_month_field_to_have_value_if_missing.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Support\Facades\DB;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class ForceCronMonthFieldToHaveValueIfMissing extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('schedules', function (Blueprint $table) {
+            DB::update("UPDATE `schedules` SET `cron_month` = '*' WHERE `cron_month` = ''");
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        // No down function.
+    }
+}