Backend Implementation Plan

Foundation Setup

Project Structure

• Create app/domain/ directory for domain models
• Create app/infrastructure/ directory for implementations
• Create app/service/ directory for business logic
• Create app/api/v1/ directory for API routes

Core Infrastructure

• Create app/core/errors.py for custom exception definitions
• Create app/core/logging.py for logging configuration
• Create app/core/security.py for authentication utilities
• Create app/core/config.py for environment configuration

Base Classes

• Create app/domain/base.py for domain model interfaces
• Create app/domain/mixins.py for shared model behaviors
• Create app/infrastructure/database.py for database connection handling
• Create app/infrastructure/base_repository.py for repository base class

Domain Layer Implementation

User Domain

• Create app/domain/user/entity.py for user domain model
• Create app/domain/user/repository.py for user repository interface
• Create app/domain/user/exceptions.py for user-specific exceptions
• Create app/domain/user/value_objects.py for user-related value objects

Tenant Domain

• Create app/domain/tenant/entity.py for tenant domain model
• Create app/domain/tenant/repository.py for tenant repository interface
• Create app/domain/tenant/exceptions.py for tenant-specific exceptions
• Create app/domain/tenant/schema.py for tenant database schema management

Infrastructure Layer Implementation

Database Implementation

• Create app/infrastructure/repositories/user_repository.py for user repository implementation
• Create app/infrastructure/repositories/tenant_repository.py for tenant repository implementation
• Create app/infrastructure/unit_of_work.py for transaction management
• Create app/infrastructure/database_session.py for session management

Security Implementation

• Create app/infrastructure/auth/jwt.py for JWT handling
• Create app/infrastructure/auth/password.py for password hashing
• Create app/infrastructure/auth/permissions.py for permission management
• Create app/infrastructure/auth/role_resolver.py for RBAC

Service Layer Implementation

Application Services

• Create app/service/user/user_service.py for user management logic
• Create app/service/auth/auth_service.py for authentication logic
• Create app/service/tenant/tenant_service.py for tenant management
• Create app/service/email/email_service.py for email notifications

DTOs and Mappers

• Create app/service/dto/user_dto.py for user data transfer objects
• Create app/service/dto/auth_dto.py for authentication DTOs
• Create app/service/dto/tenant_dto.py for tenant DTOs
• Create app/service/mappers/entity_mappers.py for entity-DTO mapping

API Layer Implementation

API Routes

• Create app/api/v1/auth.py for authentication endpoints
• Create app/api/v1/users.py for user management endpoints
• Create app/api/v1/tenants.py for tenant management endpoints
• Create app/api/v1/admin.py for administrative endpoints

Request/Response Models

• Create app/api/schemas/auth.py for auth request/response models
• Create app/api/schemas/user.py for user request/response models
• Create app/api/schemas/tenant.py for tenant request/response models
• Create app/api/schemas/error.py for error response models

Testing Infrastructure

Test Configuration

• Create tests/conftest.py with shared test fixtures
• Create tests/test_config.py for test settings
• Create tests/factories.py for test data factories
• Create tests/helpers.py for test helper functions

Unit Tests

• Create tests/unit/domain/test_user_entity.py for user domain tests
• Create tests/unit/service/test_user_service.py for user service tests
• Create tests/unit/infrastructure/test_user_repository.py for repository tests
• Create tests/unit/auth/test_security.py for security utility tests

Integration Tests

• Create tests/integration/api/test_auth_routes.py for auth endpoint tests
• Create tests/integration/api/test_user_routes.py for user endpoint tests
• Create tests/integration/api/test_tenant_routes.py for tenant endpoint tests
• Create tests/integration/infrastructure/test_database.py for database tests

Documentation

API Documentation

• Create docs/api/auth.md for authentication API documentation
• Create docs/api/users.md for user management API documentation
• Create docs/api/tenants.md for tenant management API documentation
• Create docs/api/admin.md for admin API documentation

Technical Documentation

• Create docs/architecture/domain_model.md for domain model documentation
• Create docs/architecture/database.md for database schema documentation
• Create docs/architecture/security.md for security implementation docs
• Create docs/architecture/api.md for API design documentation

Configuration and Scripts

Database Migrations

• Create alembic/versions/initial_schema.py for base database schema
• Create alembic/versions/add_user_tables.py for user-related tables
• Create alembic/versions/add_tenant_tables.py for tenant-related tables
• Create alembic/versions/add_audit_tables.py for audit logging tables

Development Scripts

• Create scripts/setup_dev.py for development environment setup
• Create scripts/seed_data.py for initial data seeding
• Create scripts/test_data.py for test data generation
• Create scripts/generate_openapi.py for OpenAPI spec generation

Monitoring Setup

Observability

• Create app/infrastructure/monitoring/logger.py for logging setup
• Create app/infrastructure/monitoring/metrics.py for metrics collection
• Create app/infrastructure/monitoring/tracing.py for request tracing
• Create app/infrastructure/monitoring/health.py for health checks