feat: Introduce base entity structure and update DTOs for Activity, Company, User, and TimeEntry

docu/README.md

@@ -13,6 +13,8 @@ This document provides an overview of the Time Tracking and Management System. F
 - [Extensibility and Integrations](extensibility_integrations.md)
 - [LLM Guidance](llm_guidance.md)
 - [Roadmap](Roadmap.md)
+- [Domain Types](domain_types.md)
+- [DTOs](dtos.md)
 
 ## Code Examples
 - [GORM Entities](code_examples/gorm_entities.go)

docu/database_schema.md

@@ -13,6 +13,40 @@ CREATE TABLE companies (
     updated_at TIMESTAMP NOT NULL DEFAULT NOW()
 );
 
+-- Go structs for creating and updating customers
+-- type CustomerCreate struct {
+-- 	Name      string
+-- 	CompanyID int
+-- }
+
+-- type CustomerUpdate struct {
+-- 	ID        ulid.ULID
+-- 	Name      *string
+-- 	CompanyID *int
+-- }
+
+-- Go structs for creating and updating companies
+-- type CompanyCreate struct {
+-- 	Name string
+-- }
+
+-- type CompanyUpdate struct {
+-- 	ID   ulid.ULID
+-- 	Name *string
+-- }
+
+-- Go structs for creating and updating activities
+-- type ActivityCreate struct {
+-- 	Name        string
+-- 	BillingRate float64
+-- }
+
+-- type ActivityUpdate struct {
+-- 	ID          ulid.ULID
+-- 	Name        *string
+-- 	BillingRate *float64
+-- }
+
 -- Users and Roles
 CREATE TABLE roles (
     id SERIAL PRIMARY KEY,

docu/domain_types.md

@@ -0,0 +1,27 @@
+# Domain Types
+
+This document describes the domain types used in the Time Tracker application. Domain types represent the core business concepts and are used throughout the application.
+
+## Activity
+
+The `Activity` type represents a specific activity that can be tracked, such as "Development", "Meeting", or "Bug Fixing".
+
+## Company
+
+The `Company` type represents a tenant in the multi-tenant application. Each company has its own set of users, customers, projects, and activities.
+
+## Customer
+
+The `Customer` type represents a customer of a company.
+
+## Project
+
+The `Project` type represents a project for a specific customer.
+
+## TimeEntry
+
+The `TimeEntry` type represents a time booking for a specific user, project, and activity.
+
+## User
+
+The `User` type represents a user of the application. Each user belongs to a company and has a specific role.

docu/dtos.md

@@ -0,0 +1,27 @@
+# Data Transfer Objects (DTOs)
+
+This document describes the Data Transfer Objects (DTOs) used in the Time Tracker application. DTOs are used to transfer data between the backend and frontend, and between different layers of the backend.
+
+## ActivityDto
+
+The `ActivityDto` type represents a specific activity that can be tracked, such as "Development", "Meeting", or "Bug Fixing". It is used to transfer activity data between the backend and frontend.
+
+## CompanyDto
+
+The `CompanyDto` type represents a tenant in the multi-tenant application. Each company has its own set of users, customers, projects, and activities. It is used to transfer company data between the backend and frontend.
+
+## CustomerDto
+
+The `CustomerDto` type represents a customer of a company. It is used to transfer customer data between the backend and frontend.
+
+## ProjectDto
+
+The `ProjectDto` type represents a project for a specific customer. It is used to transfer project data between the backend and frontend.
+
+## TimeEntryDto
+
+The `TimeEntryDto` type represents a time booking for a specific user, project, and activity. It is used to transfer time entry data between the backend and frontend.
+
+## UserDto
+
+The `UserDto` type represents a user of the application. Each user belongs to a company and has a specific role. It is used to transfer user data between the backend and frontend.