no issue
- adapt major changes of knex-migrator v3
- adapt migration scripts, simplify and add `down` (rollback) hook if possible
- clear Ghost cache after init hook (because of `knex-migrator migrate --init`)
- ensure db migrations work with the CLI
- updated troubleshooting guide (https://docs.ghost.org/v1/docs/troubleshooting#section-task-execute-is-not-a-function)
**For development only: Please ensure you run `npm i -g knex-migrator@latest` to update your global installation to v3. We always prefer the local installation, but v3 has modified and added binaries.**
closes#8334
- adds title, image and description to structured data to be rendered as open graph and twitter data.
- if meta title and description for a post exists already, the custom structured data will overwrite those for `og:` and `twitter:` data. `JSON-LD` (Schema.org`) is not affected and will stay the same.
- adds tests
- adds new og and twitter fields to schema incl. migration
