Updated command classes to include "Command" in name

app/Console/Commands/UpgradeDatabaseEncodingCommand.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace BookStack\Console\Commands;
+
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\DB;
+
+class UpgradeDatabaseEncodingCommand extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'bookstack:db-utf8mb4 
+                            {--database= : The database connection to use}';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Generate SQL commands to upgrade the database to UTF8mb4';
+
+
+    /**
+     * Execute the console command.
+     */
+    public function handle(): int
+    {
+        $connection = DB::getDefaultConnection();
+        if ($this->option('database') !== null) {
+            DB::setDefaultConnection($this->option('database'));
+        }
+
+        $database = DB::getDatabaseName();
+        $tables = DB::select('SHOW TABLES');
+        $this->line('ALTER DATABASE `' . $database . '` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;');
+        $this->line('USE `' . $database . '`;');
+        $key = 'Tables_in_' . $database;
+        foreach ($tables as $table) {
+            $tableName = $table->$key;
+            $this->line("ALTER TABLE `{$tableName}` CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;");
+        }
+
+        DB::setDefaultConnection($connection);
+
+        return 0;
+    }
+}