NewMySQL constructs MySQL with all dependencies.

NewPostgres constructs Postgres with all dependencies.

Failed represents failed to publish outbox row.

InProcess represents outbox row is already being processed by worker.

ErrNoEvents is an error returned when no ready outbox rows available after mining from DB.

MySQL represents mysql implementation for MineSweeper.

Postgres represents postgres implementation for MineSweeper.

MineSweeper should be implemented by Datastore.

Status represents the outbox row status.