feat(po-returns): make warehouse_id optional and refactor validation logic

feat(po-returns): refactor validation logic and add comprehensive test suite

feat(employee): convert designation to free-form string and remove test files

minio doc store

feat(receipts): Enhance GRN item model and schema to support base quantities and units, improving transaction accuracy

feat: Add merchant_name field to merchant model and update related tests

warehouse_id changes

feat(uom): Implement UOM service layer with CRUD operations for groups and units

Refactor COUNT queries to use COUNT(1) for improved performance and consistency across various scripts and services.

docs: update merchant type naming conventions to lowercase

merchant fixes

docs(taxonomy): standardize NCNF label formatting across documentation

feat(catalogues/pricing): standardize pricing level keys to lowercase format

refactor(database): consolidate shared database base and fix foreign key schema references

refactor: reorganize constants and clean up legacy code structure

feat(catalogues): refactor procurement schema to use batch_managed flag

backup

feat(taxonomy): Implement comprehensive taxonomy management module

test(properties_sync): Improve connection pool acquisition test reliability

feat(system_users): Make full_name and role_id optional in SystemUserModel

feat(postgres): Add connection pool metrics retrieval and reset functions

feat(sync): Add PostgreSQL connection infrastructure and sync service framework

Remove deprecated system users example, start script, and test scripts; streamline user management utilities and authentication tests.

feat: Implement system user management module with authentication and CRUD operations

feat: Add quick start example for merchant module

feat(scm-ms): Initialize SCM microservice project structure