ID 460165 - Database: OOP property for Sequences is stored in meta_data instead of hidden column

§Problem summary
Column hidden in MySQL table sequence is not actually used to set a Sequence hidden property. This is instead done in meta_data column by having "hidden": true or "hidden": false.

Customer reported version
Flix 6.3.5

Customer reported platform
CentOS7

Steps to reproduce

1) In Flix, go to View > Dev Tools and open the Network tab.

2) Navigate to the Sequences browser, and set one or two of your Sequences as OOP (click the kebab menu on the left of the Sequence > select Edit > enable OOP).

3) Click on the sequences request in the Dev Tools and find the Sequence you have just hidden.

Expected behaviour
hidden value to be true (1 in the database).

Actual behaviour

hidden value is false (0 in the database), but under meta_data there will be hidden: true.

Reproduced by support

This bug has been reproduced in:
6.3.5 - macOS 10.14 Client - CentOS 7 Server

6.3.3 - macOS 10.14 Client - CentOS 7 Server

Earlier versions may also reproduce the issue but have not been tested.