Add user and employee management enhancements with database schema updates

- Introduced new columns `status`, `created_by`, and `updated_by` in the `users` table to track user status and ownership.
- Updated the `employees` table to include a foreign key reference to the `users` table via `user_id`.
- Created migration script `0012_users_primary.sql` to apply these changes to the database schema.
- Enhanced the `EmployeesService` and `EmployeesRepository` to support user assignments and related data retrieval.
- Updated DTOs and service methods to reflect the new user and employee relationships.
- Added unit tests to validate the new functionality and ensure data integrity.
- Modified existing controllers to accommodate the new fields and relationships in user and employee management.

drizzle/migrations/0012_users_primary.sql

@@ -0,0 +1,21 @@
+ALTER TABLE "users" ADD COLUMN "status" text DEFAULT 'draft' NOT NULL;
+--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "created_by" uuid;
+--> statement-breakpoint
+ALTER TABLE "users" ADD COLUMN "updated_by" uuid;
+--> statement-breakpoint
+UPDATE "users" SET "status" = 'active', "created_by" = "id", "updated_by" = "id";
+--> statement-breakpoint
+ALTER TABLE "users" ALTER COLUMN "created_by" SET NOT NULL;
+--> statement-breakpoint
+ALTER TABLE "users" ALTER COLUMN "updated_by" SET NOT NULL;
+--> statement-breakpoint
+ALTER TABLE "users" ADD CONSTRAINT "users_created_by_users_id_fk" FOREIGN KEY ("created_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;
+--> statement-breakpoint
+ALTER TABLE "users" ADD CONSTRAINT "users_updated_by_users_id_fk" FOREIGN KEY ("updated_by") REFERENCES "public"."users"("id") ON DELETE no action ON UPDATE no action;
+--> statement-breakpoint
+ALTER TABLE "employees" ADD COLUMN "user_id" uuid;
+--> statement-breakpoint
+ALTER TABLE "employees" ADD CONSTRAINT "employees_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE set null ON UPDATE no action;
+--> statement-breakpoint
+CREATE UNIQUE INDEX "employees_user_id_unique" ON "employees" USING btree ("user_id");