Add GaqSummaryRepository and GaqSummaryInvalidationRepository and export them from the repositories index.

Update migration to replace the previous invalidated_at field with created_at and add updated_at to mirror default Sequelize tables.

…tedAt

Rename and change mcReproducible to be the coverage float not the boolean.

Forgot to remove.

Add a calculation_failed boolean column to gaq_summaries. This allows us to know whether a summary has been attempted to be calculated but unsuccessful due to limited data etc.

Remove not-null constraints from several GAQ summary columns in the migration to allow NULL when values are unavailable.

Store invalidation timestamp directly on gaq_summaries instead of a separate gaq_summary_invalidations table.

Create an index on invalidated_at column of gaq_summaries table to improve query performance, as it is commonly used to fetch the invalidated summary queue.

Sequelize model omitted the primaryKey that migration file defines.