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superset2/superset/models
Beto Dealmeida 8041b63af6 Backend only tagging system (#6823)
This PR introduces the backend changes for a tagging system for Superset, allowing dashboards, charts and queries to be tagged. It also allows searching for a given tag, and will be the basis for a new landing page (see #5327).

# Implicit tags
Dashboard, chart and (saved) queries have implicit tags related to their owners, types and favorites. For example, all objects owned by the admin have the tag `owner:1`. All charts have the tag `type:chart`. Objects favorited by the admin have the tag `favorited_by:1`.

These tags are automatically added by a migration script, and kept in sync through SQLAlchemy event listeners. They are currently not surfaced to the user, but can be searched for. For example, it's possible to search for `owner:1` in the welcome page to see all objects owned by the admin, or even search for `owner:{{ current_user_id() }}`.
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