# Release Notes: MIT - Version 2.8.6



## Improvement

| issue                                                                    | summary                                             |
|--------------------------------------------------------------------------|-----------------------------------------------------|
| [MIT-1924](https://zuarkb.atlassian.net/browse/MIT-1924/browse/MIT-1924) | Add ability to prevent writing header for `tocsv()` |

## Bug

| issue                                                                    | summary                                                                                            |
|--------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------|
| [MIT-1925](https://zuarkb.atlassian.net/browse/MIT-1925/browse/MIT-1925) | Fix broken mariadb tests                                                                           |
| [MIT-1920](https://zuarkb.atlassian.net/browse/MIT-1920/browse/MIT-1920) | 'SnowflakeDialect' object has no attribute 'default_schema_name'                                   |
| [MIT-1914](https://zuarkb.atlassian.net/browse/MIT-1914/browse/MIT-1914) | MaxTimestamp - add parameter to specify timestamp timezone, if one is not present                  |
| [MIT-1907](https://zuarkb.atlassian.net/browse/MIT-1907/browse/MIT-1907) | The word "schedule" is misspelled as "shedule" on sequence page                                    |
| [MIT-1904](https://zuarkb.atlassian.net/browse/MIT-1904/browse/MIT-1904) | Plain-text credentials apparently encrypted at upgrade with default SECRET                         |
| [MIT-1894](https://zuarkb.atlassian.net/browse/MIT-1894/browse/MIT-1894) | Redshift - Invalid argument(s) 's3_bucket','s3_access_key','s3_secret_key' sent to create_engine() |
| [MIT-1884](https://zuarkb.atlassian.net/browse/MIT-1884/browse/MIT-1884) | MySQL - decimal(32,18) converting to decimal(10) with reflect transform                            |
| [MIT-1814](https://zuarkb.atlassian.net/browse/MIT-1814/browse/MIT-1814) | Tableau Extract Jobs Failing only when started by scheduler                                        |
| [MIT-1804](https://zuarkb.atlassian.net/browse/MIT-1804/browse/MIT-1804) | Credentials - Credentials can be created without a name                                            |