[ADD] maintain: revert and update "db_online"

task-2601835

closes odoo/documentation#1191

Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com>

content/administration/maintain.rst

@@ -9,5 +9,6 @@ Maintain
     maintain/update
     maintain/enterprise
     maintain/hosting_changes
+    maintain/online
     maintain/on_premise
     maintain/supported_versions

content/administration/maintain/online.rst

@@ -0,0 +1,143 @@
+=================================
+Online (SaaS) database management
+=================================
+
+To manage a database, sign in to https://www.odoo.com and access the `database management page
+<https://www.odoo.com/my/databases>`_ by clicking on the user icon, then on *My Databases*.
+
+.. image:: online/my-databases.png
+   :align: center
+   :alt: Clicking on the user icon opens a drop-down menu. "My databases" button is highlighted.
+
+.. note::
+   Make sure you are connected as the administrator of the database you want to manage.
+
+.. image:: online/dropdown-menu.png
+   :align: right
+   :alt: Clicking on the gear icon opens the drop-down menu.
+
+Open the drop-down menu next to the database you want to manage by clicking on the gear icon.
+
+Several actions are available:
+
+- :ref:`online/upgrade`
+- :ref:`online/duplicate`
+- :ref:`online/rename`
+- :ref:`online/download`
+- :ref:`online/domains`
+- :ref:`online/tags`
+- :ref:`online/delete`
+- :ref:`online/contact-support`
+- :ref:`online/users`
+
+.. _online/upgrade:
+
+Upgrade
+=======
+
+Upgrade the database to the latest Odoo version.
+
+.. warning::
+   Upgrading a database to a newer version of Odoo is a complex operation that requires time and
+   caution. It is essential to test the upgrade before upgrading the production database.
+
+.. seealso::
+   - :doc:`../upgrade/process`
+
+.. _online/duplicate:
+
+Duplicate
+=========
+
+Make an exact copy of the database to be able to perform testing without compromising the daily
+operations.
+
+.. important::
+   - By checking *For testing purposes*, all external communication (emails, payments, delivery
+     orders, etc.) are disabled by default on the duplicated database.
+   - Duplicate databases expire automatically after 15 days.
+
+.. _online/rename:
+
+Rename
+======
+
+Rename the database and its URL.
+
+.. _online/download:
+
+Download
+========
+
+Download instantly a ZIP file with a backup of the database.
+
+.. note::
+   Databases are backed up daily according to the `Odoo Cloud SLA
+   <https://www.odoo.com/cloud-sla>`_.
+
+.. _online/domains:
+
+Domains
+=======
+
+Configure custom domains to access the database via another URL.
+
+.. seealso::
+   - :doc:`/applications/websites/website/publish/domain_name`
+
+.. _online/tags:
+
+Tags
+====
+
+Add tags to sort your databases out. You can search the tags in the search bar.
+
+.. _online/delete:
+
+Delete
+======
+
+Delete a database instantly.
+
+.. danger::
+   Deleting a database means that all data is permanently lost. The deletion is instant and for all
+   users. It is recommended to create a backup of the database before deleting it.
+
+Read carefully the warning message that pops up and proceed only if you fully understand the
+implications of deleting a database:
+
+.. image:: online/delete.png
+   :align: center
+   :alt: A warning message is prompted before deleting a database.
+
+.. note::
+   - Only an administrator can delete a database.
+   - The database name is immediately available for a new database.
+   - It is not possible to delete a database if it is expired or linked to a subscription. If
+     needed, please get in touch with `Odoo Support <https://www.odoo.com/help>`_.
+   - To delete your account, please get in touch with `Odoo Support <https://www.odoo.com/help>`_.
+
+.. _online/contact-support:
+
+Contact Support
+===============
+
+Access the Odoo `support page <https://www.odoo.com/help>`_ with your database's details already
+pre-filled.
+
+.. _online/users:
+
+Invite / Remove Users
+=====================
+
+To invite users, fill out the email address of the new user and click on *Invite*. To add multiple
+users, click on *Add more users*.
+
+.. image:: online/invite-users.png
+   :align: center
+   :alt: Clicking on "Add more users" adds additional email fields.
+
+To remove users, select the users to remove and click on *Remove*.
+
+.. seealso::
+   - :doc:`/applications/general/users/manage_users`