Add postgres migration

database/migrations/2023_05_03_023758_update_postgres_visibility_defaults_on_statuses_table.php

@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+use Illuminate\Support\Facades\DB;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        $type = config('database.default');
+
+        if($type === 'pgsql') {
+			DB::statement("ALTER TABLE statuses DROP CONSTRAINT statuses_visibility_check");
+
+			$types = ['public', 'unlisted', 'private', 'direct', 'draft'];
+			$result = join( ', ', array_map(function ($value){
+			    return sprintf("'%s'::character varying", $value);
+			}, $types));
+
+			DB::statement("ALTER TABLE statuses ADD CONSTRAINT statuses_visibility_check CHECK (visibility::text = ANY (ARRAY[$result]::text[]))");
+        }
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        //
+    }
+};