# Dev_Agent Report

## Task: Create UserPresence Entity

### Date: 2026-02-24

## Summary
Successfully created the UserPresence entity with all required properties and configurations.

## Files Created/Modified

### 1. UserStatus Enum
**File:** `Chat.Domain/Enums/UserStatus.cs`

Created enum with three values:
- Online
- Offline
- Away

### 2. UserPresence Entity
**File:** `Chat.Domain/Entities/UserPresence.cs`

Properties implemented:
- ✅ UserId (Guid) - Primary Key
- ✅ Status (UserStatus enum)
- ✅ LastSeenAt (DateTime)
- ✅ ConnectionId (string?) - For SignalR

### 3. Database Context Update
**File:** `Chat.Domain/Context.cs`

Added:
- DbSet<UserPresence> UserPresences property
- Entity configuration with:
  - Primary key (UserId)
  - Required fields constraints
  - Max length for ConnectionId (255)
  - Indexes for Status, ConnectionId, LastSeenAt
  - Prepared relationship for User entity (commented out until User entity exists)

## Implementation Details

### Default Values
- Status: UserStatus.Offline
- LastSeenAt: DateTime.UtcNow
- ConnectionId: null

### Database Configuration
- UserId configured as primary key
- Status field is required
- LastSeenAt field is required
- ConnectionId has max length of 255 characters
- Created indexes for optimal query performance (Status, ConnectionId, LastSeenAt)
- Foreign key relationship prepared for future User entity with Cascade delete

### Code Quality
- Follows existing code patterns from Message and Conversation entities
- Uses XML documentation comments
- Proper namespace organization
- Follows C# naming conventions

## Status: ✅ SUCCESS

All required properties have been implemented according to task specifications.