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.

src/database/employees-table.ts

@@ -14,9 +14,13 @@ export const employees = pgTable(
     name: varchar('name', { length: 64 }).notNull(),
     phone: text('phone').notNull(),
     position: text('position').notNull(),
+    userId: uuid('user_id').references(() => users.id, { onDelete: 'set null' }),
     ...primaryEntityColumns(users),
   },
-  (t) => [uniqueIndex('employees_code_unique').on(t.code)],
+  (t) => [
+    uniqueIndex('employees_code_unique').on(t.code),
+    uniqueIndex('employees_user_id_unique').on(t.userId),
+  ],
 );
 
 export type EmployeeRow = typeof employees.$inferSelect;