Schema priv extension

#### What's this PR do?
Extends schema privilege setting with DB setting

#### Where should the reviewer start?

#### How should this be manually tested?

#### Any background context you want to provide?

#### What are the relevant Asana issues?

#### Screenshots (if appropriate)

#### Questions:
  - Do we need to translate new strings?
  - Does anyone need to be notified when this has been deployed?
  - Does this include migrations that might take a while?