diff --git a/app/Core/DB/mysql.php b/app/Core/DB/mysql.php
deleted file mode 100644
index a5aedd64..00000000
--- a/app/Core/DB/mysql.php
+++ /dev/null
@@ -1,588 +0,0 @@
-<?php
-/**
- * This file is part of the ForkBB <https://github.com/forkbb>.
- *
- * @copyright (c) Visman <mio.visman@yandex.ru, https://github.com/MioVisman>
- * @license   The MIT License (MIT)
- */
-
-declare(strict_types=1);
-
-namespace ForkBB\Core\DB;
-
-use ForkBB\Core\DB;
-use PDO;
-use PDOStatement;
-use PDOException;
-
-class Mysql
-{
-    /**
-     * @var DB
-     */
-    protected $db;
-
-    /**
-     * Префикс для таблиц базы
-     * @var string
-     */
-    protected $dbPrefix;
-
-    /**
-     * Массив замены типов полей таблицы
-     * @var array
-     */
-    protected $dbTypeRepl = [
-        '%^SERIAL$%i' => 'INT(10) UNSIGNED AUTO_INCREMENT',
-    ];
-
-    /**
-     * Подстановка типов полей для карты БД
-     * @var array
-     */
-    protected $types = [
-        'bool'      => 'b',
-        'boolean'   => 'b',
-        'tinyint'   => 'i',
-        'smallint'  => 'i',
-        'mediumint' => 'i',
-        'int'       => 'i',
-        'integer'   => 'i',
-        'bigint'    => 'i',
-        'decimal'   => 'i',
-        'dec'       => 'i',
-        'float'     => 'i',
-        'double'    => 'i',
-    ];
-
-    public function __construct(DB $db, string $prefix)
-    {
-        $this->db = $db;
-
-        $this->testStr($prefix);
-
-        $this->dbPrefix = $prefix;
-    }
-
-    /**
-     * Перехват неизвестных методов
-     */
-    public function __call(string $name, array $args)
-    {
-        throw new PDOException("Method '{$name}' not found in DB driver.");
-    }
-
-    /**
-     * Проверяет строку на допустимые символы
-     */
-    protected function testStr(string $str): void
-    {
-        if (\preg_match('%[^a-zA-Z0-9_]%', $str)) {
-            throw new PDOException("Name '{$str}' have bad characters.");
-        }
-    }
-
-    /**
-     * Операции над полями индексов: проверка, замена
-     */
-    protected function replIdxs(array $arr): string
-    {
-        foreach ($arr as &$value) {
-            if (\preg_match('%^(.*)\s*(\(\d+\))$%', $value, $matches)) {
-                $this->testStr($matches[1]);
-
-                $value = "`{$matches[1]}`{$matches[2]}";
-            } else {
-                $this->testStr($value);
-
-                $value = "`{$value}`";
-            }
-            unset($value);
-        }
-
-        return \implode(',', $arr);
-    }
-
-    /**
-     * Замена типа поля в соответствии с dbTypeRepl
-     */
-    protected function replType(string $type): string
-    {
-        return \preg_replace(\array_keys($this->dbTypeRepl), \array_values($this->dbTypeRepl), $type);
-    }
-
-    /**
-     * Конвертирует данные в строку для DEFAULT
-     */
-    protected function convToStr(/* mixed */ $data): string
-    {
-        if (\is_string($data)) {
-            return $this->db->quote($data);
-        } elseif (\is_numeric($data)) {
-            return (string) $data;
-        } elseif (\is_bool($data)) {
-            return $data ? 'true' : 'false';
-        } else {
-            throw new PDOException('Invalid data type for DEFAULT.');
-        }
-    }
-
-    /**
-     * Проверяет наличие таблицы в базе
-     */
-    public function tableExists(string $table, bool $noPrefix = false): bool
-    {
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        try {
-            $vars = [
-                ':table' => $table,
-            ];
-            $query = 'SELECT 1
-                FROM INFORMATION_SCHEMA.TABLES
-                WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?s:table';
-
-            $stmt   = $this->db->query($query, $vars);
-            $result = $stmt->fetch();
-            $stmt->closeCursor();
-        } catch (PDOException $e) {
-            return false;
-        }
-
-        return ! empty($result);
-    }
-
-    /**
-     * Проверяет наличие поля в таблице
-     */
-    public function fieldExists(string $table, string $field, bool $noPrefix = false): bool
-    {
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        try {
-            $vars = [
-                ':table' => $table,
-                ':field' => $field,
-            ];
-            $query = 'SELECT 1
-                FROM INFORMATION_SCHEMA.COLUMNS
-                WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?s:table AND COLUMN_NAME = ?s:field';
-
-            $stmt   = $this->db->query($query, $vars);
-            $result = $stmt->fetch();
-            $stmt->closeCursor();
-        } catch (PDOException $e) {
-            return false;
-        }
-
-        return ! empty($result);
-    }
-
-    /**
-     * Проверяет наличие индекса в таблице
-     */
-    public function indexExists(string $table, string $index, bool $noPrefix = false): bool
-    {
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-        $index = 'PRIMARY' == $index ? $index : $table . '_' . $index;
-
-        try {
-            $vars = [
-                ':table' => $table,
-                ':index' => $index,
-            ];
-            $query = 'SELECT 1
-                FROM INFORMATION_SCHEMA.STATISTICS
-                WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?s:table AND INDEX_NAME = ?s:index';
-
-            $stmt   = $this->db->query($query, $vars);
-            $result = $stmt->fetch();
-            $stmt->closeCursor();
-        } catch (PDOException $e) {
-            return false;
-        }
-
-        return ! empty($result);
-    }
-
-    /**
-     * Создает таблицу
-     */
-    public function createTable(string $table, array $schema, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        $query = "CREATE TABLE IF NOT EXISTS `{$table}` (";
-        foreach ($schema['FIELDS'] as $field => $data) {
-            $this->testStr($field);
-            // имя и тип
-            $query .= "`{$field}` " . $this->replType($data[0]);
-            // сравнение
-            if (\preg_match('%^(?:CHAR|VARCHAR|TINYTEXT|TEXT|MEDIUMTEXT|LONGTEXT|ENUM|SET)%i', $data[0])) {
-                $query .= ' CHARACTER SET utf8mb4 COLLATE utf8mb4_';
-                if (
-                    isset($data[3])
-                    && \is_string($data[3])
-                ) {
-                    $this->testStr($data[3]);
-                    $query .= $data[3];
-                } else {
-                    $query .= 'unicode_ci';
-                }
-            }
-            // не NULL
-            if (empty($data[1])) {
-                $query .= ' NOT NULL';
-            }
-            // значение по умолчанию
-            if (isset($data[2])) {
-                $query .= ' DEFAULT ' . $this->convToStr($data[2]);
-            }
-            $query .= ', ';
-        }
-        if (isset($schema['PRIMARY KEY'])) {
-            $query .= 'PRIMARY KEY (' . $this->replIdxs($schema['PRIMARY KEY']) . '), ';
-        }
-        if (isset($schema['UNIQUE KEYS'])) {
-            foreach ($schema['UNIQUE KEYS'] as $key => $fields) {
-                $this->testStr($key);
-
-                $query .= "UNIQUE `{$table}_{$key}` (" . $this->replIdxs($fields) . '), ';
-            }
-        }
-        if (isset($schema['INDEXES'])) {
-            foreach ($schema['INDEXES'] as $index => $fields) {
-                $this->testStr($index);
-
-                $query .= "INDEX `{$table}_{$index}` (" . $this->replIdxs($fields) . '), ';
-            }
-        }
-        if (isset($schema['ENGINE'])) {
-            $engine = $schema['ENGINE'];
-        } else {
-            // при отсутствии типа таблицы он определяется на основании типов других таблиц в базе
-            $prefix = \str_replace('_', '\\_', $this->dbPrefix);
-            $stmt = $this->db->query("SHOW TABLE STATUS LIKE '{$prefix}%'");
-            $engine = [];
-            while ($row = $stmt->fetch()) {
-                if (isset($engine[$row['Engine']])) {
-                    ++$engine[$row['Engine']];
-                } else {
-                    $engine[$row['Engine']] = 1;
-                }
-            }
-            // в базе нет таблиц
-            if (empty($engine)) {
-                $engine = 'MyISAM';
-            } else {
-                \arsort($engine);
-                // берем тип наиболее часто встречаемый у имеющихся таблиц
-                $engine = \array_keys($engine);
-                $engine = \array_shift($engine);
-            }
-        }
-        $this->testStr($engine);
-        $query = \rtrim($query, ', ') . ") ENGINE={$engine} CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci";
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Удаляет таблицу
-     */
-    public function dropTable(string $table, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        return false !== $this->db->exec("DROP TABLE IF EXISTS `{$table}`");
-    }
-
-    /**
-     * Переименовывает таблицу
-     */
-    public function renameTable(string $old, string $new, bool $noPrefix = false): bool
-    {
-        $this->testStr($old);
-        $this->testStr($new);
-
-        if (
-            $this->tableExists($new, $noPrefix)
-            && ! $this->tableExists($old, $noPrefix)
-        ) {
-            return true;
-        }
-
-        $old = ($noPrefix ? '' : $this->dbPrefix) . $old;
-        $new = ($noPrefix ? '' : $this->dbPrefix) . $new;
-
-        return false !== $this->db->exec("ALTER TABLE `{$old}` RENAME TO `{$new}`");
-    }
-
-    /**
-     * Добавляет поле в таблицу
-     */
-    public function addField(string $table, string $field, string $type, bool $allowNull, /* mixed */ $default = null, string $after = null, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-        $this->testStr($field);
-
-        if ($this->fieldExists($table, $field, $noPrefix)) {
-            return true;
-        }
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        $query = "ALTER TABLE `{$table}` ADD `{$field}` " . $this->replType($type);
-        if (! $allowNull) {
-            $query .= ' NOT NULL';
-        }
-        if (null !== $default) {
-            $query .= ' DEFAULT ' . $this->convToStr($default);
-        }
-        if (null !== $after) {
-            $this->testStr($after);
-
-            $query .= " AFTER `{$after}`";
-        }
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Модифицирует поле в таблице
-     */
-    public function alterField(string $table, string $field, string $type, bool $allowNull, /* mixed */ $default = null, string $after = null, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-        $this->testStr($field);
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        $query = "ALTER TABLE `{$table}` MODIFY `{$field}` " . $this->replType($type);
-        if (! $allowNull) {
-            $query .= ' NOT NULL';
-        }
-        if (null !== $default) {
-            $query .= ' DEFAULT ' . $this->convToStr($default);
-        }
-        if (null !== $after) {
-            $this->testStr($after);
-
-            $query .= " AFTER `{$after}`";
-        }
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Удаляет поле из таблицы
-     */
-    public function dropField(string $table, string $field, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-        $this->testStr($field);
-
-        if (! $this->fieldExists($table, $field, $noPrefix)) {
-            return true;
-        }
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        return false !== $this->db->exec("ALTER TABLE `{$table}` DROP COLUMN `{$field}`");
-    }
-
-    /**
-     * Переименование поля в таблице
-     */
-    public function renameField(string $table, string $old, string $new, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-        $this->testStr($old);
-        $this->testStr($new);
-
-        if (
-            ! $this->fieldExists($table, $old, $noPrefix)
-            || $this->fieldExists($table, $new, $noPrefix)
-        ) {
-            return false;
-        }
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        try {
-            $vars = [
-                ':table' => $table,
-                ':field' => $old,
-            ];
-            $query = 'SELECT COLUMN_DEFAULT, IS_NULLABLE, COLUMN_TYPE
-                FROM INFORMATION_SCHEMA.COLUMNS
-                WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME = ?s:table AND COLUMN_NAME = ?s:field';
-
-            $stmt   = $this->db->query($query, $vars);
-            $result = $stmt->fetch();
-            $stmt->closeCursor();
-
-            $type      = $result['COLUMN_TYPE'];
-            $allowNull = 'YES' == $result['IS_NULLABLE'];
-            $default   = $result['COLUMN_DEFAULT'];
-        } catch (PDOException $e) {
-            return false;
-        }
-
-        $query = "ALTER TABLE `{$table}` CHANGE COLUMN `{$old}` `{$new}` " . $this->replType($type);
-        if (! $allowNull) {
-            $query .= ' NOT NULL';
-        }
-        if (null !== $default) {
-            $query .= ' DEFAULT ' . $this->convToStr($default);
-        }
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Добавляет индекс в таблицу
-     */
-    public function addIndex(string $table, string $index, array $fields, bool $unique = false, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-
-        if ($this->indexExists($table, $index, $noPrefix)) {
-            return true;
-        }
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        $query = "ALTER TABLE `{$table}` ADD ";
-        if ('PRIMARY' == $index) {
-            $query .= 'PRIMARY KEY';
-        } else {
-            $index = $table . '_' . $index;
-
-            $this->testStr($index);
-
-            if ($unique) {
-                $query .= "UNIQUE `{$index}`";
-            } else {
-                $query .= "INDEX `{$index}`";
-            }
-        }
-        $query .= ' (' . $this->replIdxs($fields) . ')';
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Удаляет индекс из таблицы
-     */
-    public function dropIndex(string $table, string $index, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-
-        if (! $this->indexExists($table, $index, $noPrefix)) {
-            return true;
-        }
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        $query = "ALTER TABLE `{$table}` ";
-        if ('PRIMARY' == $index) {
-            $query .= "DROP PRIMARY KEY";
-        } else {
-            $index = $table . '_' . $index;
-
-            $this->testStr($index);
-
-            $query .= "DROP INDEX `{$index}`";
-        }
-
-        return false !== $this->db->exec($query);
-    }
-
-    /**
-     * Очищает таблицу
-     */
-    public function truncateTable(string $table, bool $noPrefix = false): bool
-    {
-        $this->testStr($table);
-
-        $table = ($noPrefix ? '' : $this->dbPrefix) . $table;
-
-        return false !== $this->db->exec("TRUNCATE TABLE `{$table}`");
-    }
-
-    /**
-     * Возвращает статистику
-     */
-    public function statistics(): array
-    {
-        $prefix  = str_replace('_', '\\_', $this->dbPrefix);
-        $stmt    = $this->db->query("SHOW TABLE STATUS LIKE '{$prefix}%'");
-        $records = $size = 0;
-        $engine  = [];
-
-        while ($row = $stmt->fetch()) {
-            $records += $row['Rows'];
-            $size += $row['Data_length'] + $row['Index_length'];
-            if (isset($engine[$row['Engine']])) {
-                ++$engine[$row['Engine']];
-            } else {
-                $engine[$row['Engine']] = 1;
-            }
-        }
-
-        \arsort($engine);
-
-        $tmp = [];
-
-        foreach ($engine as $key => $val) {
-            $tmp[] = "{$key}({$val})";
-        }
-
-        $other = [];
-        $stmt  = $this->db->query("SHOW VARIABLES LIKE 'character\\_set\\_%'");
-
-        while ($row = $stmt->fetch(PDO::FETCH_NUM)) {
-            $other[$row[0]] = $row[1];
-        }
-
-        return [
-            'db'      => 'MySQL (PDO) ' . $this->db->getAttribute(PDO::ATTR_SERVER_VERSION) . ' : ' . implode(', ', $tmp),
-            'records' => $records,
-            'size'    => $size,
-            'server info' => $this->db->getAttribute(PDO::ATTR_SERVER_INFO),
-        ] + $other;
-    }
-
-    /**
-     * Формирует карту базы данных
-     */
-    public function getMap(): array
-    {
-        $vars = [
-            "{$this->dbPrefix}%",
-        ];
-        $query = 'SELECT TABLE_NAME, COLUMN_NAME, DATA_TYPE
-            FROM INFORMATION_SCHEMA.COLUMNS
-            WHERE TABLE_SCHEMA = DATABASE() AND TABLE_NAME LIKE ?s';
-
-        $stmt   = $this->db->query($query, $vars);
-        $result = [];
-        $table  = null;
-        while ($row = $stmt->fetch()) {
-            if ($table !== $row['TABLE_NAME']) {
-                $table = $row['TABLE_NAME'];
-                $tableNoPref = \substr($table, \strlen($this->dbPrefix));
-                $result[$tableNoPref] = [];
-            }
-            $type = \strtolower($row['DATA_TYPE']);
-            $result[$tableNoPref][$row['COLUMN_NAME']] = $this->types[$type] ?? 's';
-        }
-
-        return $result;
-    }
-}