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Remove table 'custom_table_view_data' which was used to save settings of the custom tables, and save all custom table information in configuration. Now it is very easy to move your work across different sites.
This is an alpha release for the next feature release of Drupal 8. Alpha releases are good testing targets for developers and site builders who are comfortable reporting (and where possible, fixing) their own bugs. Alpha releases are not recommended for non-technical users, nor for production websites. More information on alpha releases.