feat(matrix): add indexes to optimise queries

db/migrations/20200106_create_indexes_on_latest_pact_publications.rb

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+Sequel.migration do
+  up do
+    alter_table(:latest_pact_publication_ids_for_consumer_versions) do
+      add_index [:consumer_id], name: 'ndx_latest_pact_publications_consumer_id'
+      add_index [:provider_id], name: 'ndx_latest_pact_publications_provider_id'
+      add_index [:consumer_version_id], name: 'ndx_latest_pact_publications_cv_id'
+    end
+  end
+
+  down do
+    alter_table(:latest_pact_publication_ids_for_consumer_versions) do
+      drop_index [:consumer_id], name: 'ndx_latest_pact_publications_consumer_id'
+      drop_index [:provider_id], name: 'ndx_latest_pact_publications_provider_id'
+      drop_index [:consumer_version_id], name: 'ndx_latest_pact_publications_cv_id'
+    end
+  end
+end

db/migrations/20200107_create_indexes_on_latest_verifications.rb

@@ -0,0 +1,17 @@
+Sequel.migration do
+  up do
+    alter_table(:latest_verification_id_for_pact_version_and_provider_version) do
+      add_index [:consumer_id], name: 'ndx_latest_verification_consumer_id'
+      add_index [:provider_id], name: 'ndx_latest_verification_provider_id'
+      add_index [:provider_version_id], name: 'ndx_latest_verification_provider_version_id'
+    end
+  end
+
+  down do
+    alter_table(:latest_verification_id_for_pact_version_and_provider_version) do
+      drop_index [:consumer_id], name: 'ndx_latest_verification_consumer_id'
+      drop_index [:provider_id], name: 'ndx_latest_verification_provider_id'
+      drop_index [:provider_version_id], name: 'ndx_latest_verification_provider_version_id'
+    end
+  end
+end