New model and migration.

app/Models/AutoBudget.php

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+<?php
+/**
+ * AutoBudget.php
+ * Copyright (c) 2020 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * Class AutoBudget
+ */
+class AutoBudget extends Model
+{
+    /** @var int When the auto-budget resets every period automatically. */
+    public const AUTO_BUDGET_RESET = 1;
+    /** @var int When the auto-budget adds an amount every period automatically */
+    public const AUTO_BUDGET_ROLLOVER = 2;
+
+    use SoftDeletes;
+    //
+}

database/migrations/2020_03_13_201950_changes_for_v520.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+
+/**
+ * Class ChangesForV520
+ */
+class ChangesForV520 extends Migration
+{
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('auto_budgets');
+    }
+
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up(): void
+    {
+        if (!Schema::hasTable('auto_budgets')) {
+            Schema::create(
+                'auto_budgets',
+                static function (Blueprint $table) {
+                    $table->increments('id');
+                    $table->timestamps();
+                    $table->softDeletes();
+                    $table->integer('budget_id', false, true);
+                    $table->integer('transaction_currency_id', false, true);
+                    $table->tinyInteger('auto_budget_type', false, true)->default(1);
+                    $table->decimal('amount', 22, 12);
+                    $table->string('period', 50);
+
+
+                    //$table->string('password', 60);
+                    //$table->string('remember_token', 100)->nullable();
+                    //$table->string('reset', 32)->nullable();
+                    //$table->tinyInteger('blocked', false, true)->default('0');
+                    //$table->string('blocked_code', 25)->nullable();
+
+                    $table->foreign('transaction_currency_id')->references('id')->on('transaction_currencies')->onDelete('cascade');
+                    $table->foreign('budget_id')->references('id')->on('budgets')->onDelete('cascade');
+                }
+            );
+        }
+    }
+}