refactoring

backend/prisma/migrations/20260218000001_remove_unique_project_id_from_ongoing_timers/migration.sql

@@ -0,0 +1,4 @@
+-- Remove the erroneous UNIQUE constraint on ongoing_timers.project_id.
+-- Multiple users must be able to have concurrent timers on the same project.
+-- The one-timer-per-user constraint is correctly enforced by the UNIQUE on user_id.
+DROP INDEX IF EXISTS "ongoing_timers_project_id_key";