chore: index dates and mr events (#380)

* index transform_dates on week

* index transform_merge_request_events on occured_on

* generated migrations for tenant-db

Author: dejan-crocoder

migrations/tenant-db/0002_wise_swarm.sql

@@ -0,0 +1,2 @@
+CREATE INDEX `dates_week_idx` ON `transform_dates` (`week`);--> statement-breakpoint
+CREATE INDEX `merge_request_events_occured_on_idx` ON `transform_merge_request_events` (`occured_on`);