diff --git a/src/Maintenance.php b/src/Maintenance.php
new file mode 100644
index 0000000..423be69
--- /dev/null
+++ b/src/Maintenance.php
@@ -0,0 +1,210 @@
+<?php
+/*
+	Copyright (c) TPsoft.org 2000-2025
+	Author: Ing. Igor Mino <mino@tpsoft.org>
+	License: GNU GPL-3.0 or later
+
+	Description: Tool for automatic maintenance of database in your project.
+	Version: 1.0.0
+
+	Milestones:
+	2025-05-29 07:59  Igor - Forked from Beteha to standalone public library
+*/
+
+namespace TPsoft\DBmodel;
+
+class Maintenance
+{
+	public const ABNORMAL = 0;
+	public const OK = 1;
+	public const FIXED = 2;
+	public const FIX_FAILED = 3;
+	public const UPDATED = 4;
+	public const UPDATE_FAIL = 5;
+
+	public string $lastMessage = '';
+
+	private DBmodel $dbh;
+
+	public function __construct(DBmodel $dbh)
+	{
+		$this->dbh = $dbh;
+	}
+
+	public function testDB($test, $test_out)
+	{
+		global $core;
+		if (is_array($test_out)) {
+			$row = $core->dbh->getRow($test);
+			if (!is_array($row)) return false;
+			foreach ($test_out as $col => $val) {
+				if (strlen($row[$col]) != strlen($val)) {
+					$max_len = min(strlen($row[$col]), strlen($val));
+					if (substr(strtolower($row[$col]), 0, $max_len) != substr(strtolower($val), 0, $max_len)) {
+						return false;
+					}
+				} else {
+					if (strtolower($row[$col]) != strtolower($val)) {
+						return false;
+					}
+				}
+			}
+			return true;
+		} else {
+			return $core->dbh->getOne($test) == $test_out;
+		}
+	}
+
+	public function checkDB($test, $test_out, $fix)
+	{
+		global $core;
+		if ($this->testDB($test, $test_out)) {
+			return Maintenance::OK;
+		} else {
+			$core->dbh->query($fix);
+			if ($this->testDB($test, $test_out)) {
+				return Maintenance::FIXED;
+			} else {
+				return Maintenance::FIX_FAILED;
+			}
+		}
+		return 0;
+	}
+
+	public function checkDBTable($table_index, $definition)
+	{
+		global $core;
+		$table_name = $core->tables[$table_index];
+		if (strlen($table_name) <= 0) {
+			$this->lastMessage = 'Table ' . strtoupper($table_index) . ' - invalid index';
+			return Maintenance::ABNORMAL;
+		}
+		$status = $this->checkDB(
+			// TEST query
+			'SHOW TABLES LIKE "' . $table_name . '"',
+			// TEST output
+			$table_name,
+			// FIX query
+			'CREATE TABLE `' . $table_name . '` (' . $definition . ')'
+		);
+		$this->lastMessage = 'Table ' . strtoupper($table_index) . ' (' . $table_name . ')';
+		return $status;
+	}
+
+	public function checkDBAdd($table_index, $column, $definition)
+	{
+		global $core;
+		$status = $this->checkDB(
+			// TEST query
+			'DESCRIBE `' . $core->tables[$table_index] . '` `' . $column . '`',
+			// TEST output
+			$column,
+			// FIX query
+			'ALTER TABLE `' . $core->tables[$table_index] . '` ADD `' . $column . '` ' . $definition
+		);
+		$this->lastMessage = "Added column $column to table $table_index";
+		return $status;
+	}
+
+	public function checkDBRename($table_index, $column_old, $column_new, $definition, $test = null)
+	{
+		global $core;
+		$status = $this->checkDB(
+			// TEST query
+			'DESCRIBE `' . $core->tables[$table_index] . '` `' . $column_old . '`',
+			// TEST output
+			$test,
+			// FIX query
+			'ALTER TABLE `' . $core->tables[$table_index] . '` CHANGE `' . $column_old . '` `' . $column_new . '` ' . $definition
+		);
+		$this->lastMessage = "Renamed  column $column_old to $column_new for $table_index";
+		return $status;
+	}
+
+	public function checkDBRetype($table_index, $column, $new_type, $definition)
+	{
+		global $core;
+		$status = $this->checkDB(
+			// TEST query
+			'DESCRIBE `' . $core->tables[$table_index] . '` `' . $column . '`',
+			// TEST output
+			array('type' => strtolower($new_type)),
+			// FIX query
+			'ALTER TABLE `' . $core->tables[$table_index] . '` CHANGE `' . $column . '` `' . $column . '` ' . $definition
+		);
+		$this->lastMessage = "Changed type of column $column for tabke $table_index to tyoe " . strtoupper($new_type);
+		return $status;
+	}
+
+	public function checkDBRemove($table_index, $column)
+	{
+		global $core;
+		$status = $this->checkDB(
+			// TEST query
+			'DESCRIBE `' . $core->tables[$table_index] . '` `' . $column . '`',
+			// TEST output
+			NULL,
+			// FIX query
+			'ALTER TABLE `' . $core->tables[$table_index] . '` DROP COLUMN `' . $column . '`'
+		);
+		$this->lastMessage = "Removed column $column for $table_index";
+		return $status;
+	}
+
+	public function dropKey($table_index, $key)
+	{
+		global $core;
+		$test = 'SHOW INDEX FROM `' . $core->tables[$table_index] . '` WHERE column_name = "' . $key . '"';
+		$test_out = null;
+		if ($this->testDB($test, $test_out)) {
+			$status = Maintenance::OK;
+		} else {
+			$index_name = $core->dbh->getRow('SHOW INDEX FROM `' . $core->tables[$table_index] . '` WHERE column_name = "' . $key . '"')['key_name'];
+			$fix = 'ALTER TABLE `' . $core->tables[$table_index] . '` DROP INDEX ' . $index_name;
+			$core->dbh->query($fix);
+			if ($this->testDB($test, $test_out)) {
+				$status = Maintenance::FIXED;
+			} else {
+				$status = Maintenance::FIX_FAILED;
+			}
+		}
+		$this->lastMessage = 'Deleted KEY ' . $key . ' for ' . $table_index;
+		return $status;
+	}
+
+	public function addKey($table_index, $key)
+	{
+		global $core;
+		$test = 'SHOW INDEX FROM `' . $core->tables[$table_index] . '` WHERE column_name = "' . $key . '"';
+		$test_out = array('table' => $core->tables[$table_index]);
+		if ($this->testDB($test, $test_out)) {
+			$status = Maintenance::OK;
+		} else {
+			$fix = 'CREATE INDEX `' . $key . '` ON `' . $core->tables[$table_index] . '` (`' . $key . '`)';
+			$core->dbh->query($fix);
+			if ($this->testDB($test, $test_out)) {
+				$status = Maintenance::FIXED;
+			} else {
+				$status = Maintenance::FIX_FAILED;
+			}
+		}
+		$this->lastMessage = 'Added KEY ' . $key . ' for ' . $table_index;
+		return $status;
+	}
+
+	public function updateDB($test, $test_out, $update)
+	{
+		global $core;
+		if (!$this->testDB($test, $test_out)) {
+			return Maintenance::OK;
+		} else {
+			$suc = $core->dbh->query($update);
+			if ($suc !== false) {
+				return Maintenance::UPDATED;
+			} else {
+				return Maintenance::UPDATE_FAIL;
+			}
+		}
+		return 0;
+	}
+}