Add Announcements and Dashboard controllers with all DTOs

backend/Controllers/AnnouncementsController.cs

@@ -0,0 +1,252 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class AnnouncementsController : ControllerBase
+{
+    private readonly RacePlannerDbContext _context;
+
+    public AnnouncementsController(RacePlannerDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpPost]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<AnnouncementDto>> CreateAnnouncement(CreateAnnouncementRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Verify event exists and user is organizer
+        var eventEntity = await _context.Events
+            .FirstOrDefaultAsync(e => e.Id == request.EventId);
+
+        if (eventEntity == null)
+        {
+            return NotFound(new { error = "Event not found" });
+        }
+
+        if (eventEntity.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        var announcement = new Announcement
+        {
+            EventId = request.EventId,
+            Title = request.Title,
+            Content = request.Content,
+            AuthorId = userId.Value,
+            IsPublished = true
+        };
+
+        _context.Announcements.Add(announcement);
+        await _context.SaveChangesAsync();
+
+        // Load related data
+        await _context.Entry(announcement)
+            .Reference(a => a.Event)
+            .LoadAsync();
+        await _context.Entry(announcement)
+            .Reference(a => a.Author)
+            .LoadAsync();
+
+        // TODO: Send notifications to registered participants (Task 7.7)
+
+        return CreatedAtAction(
+            nameof(GetAnnouncement),
+            new { id = announcement.Id },
+            MapToAnnouncementDto(announcement));
+    }
+
+    [HttpGet("{id}")]
+    public async Task<ActionResult<AnnouncementDto>> GetAnnouncement(Guid id)
+    {
+        var announcement = await _context.Announcements
+            .Include(a => a.Event)
+            .Include(a => a.Author)
+            .FirstOrDefaultAsync(a => a.Id == id);
+
+        if (announcement == null)
+        {
+            return NotFound();
+        }
+
+        // Only show published announcements to participants
+        if (!announcement.IsPublished)
+        {
+            var userId = GetCurrentUserId();
+            if (userId == null || announcement.Event.OrganizerId != userId.Value)
+            {
+                return NotFound();
+            }
+        }
+
+        return Ok(MapToAnnouncementDto(announcement));
+    }
+
+    [HttpGet("event/{eventId}")]
+    public async Task<ActionResult<IEnumerable<AnnouncementDto>>> GetEventAnnouncements(Guid eventId)
+    {
+        var userId = GetCurrentUserId();
+        var isOrganizer = false;
+
+        if (userId != null)
+        {
+            isOrganizer = await _context.Events
+                .AnyAsync(e => e.Id == eventId && e.OrganizerId == userId.Value);
+        }
+
+        var query = _context.Announcements
+            .Include(a => a.Event)
+            .Include(a => a.Author)
+            .Where(a => a.EventId == eventId)
+            .AsQueryable();
+
+        // Only show published announcements to non-organizers
+        if (!isOrganizer)
+        {
+            query = query.Where(a => a.IsPublished);
+        }
+
+        var announcements = await query
+            .OrderByDescending(a => a.CreatedAt)
+            .ToListAsync();
+
+        return Ok(announcements.Select(MapToAnnouncementDto));
+    }
+
+    [HttpPut("{id}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<AnnouncementDto>> UpdateAnnouncement(Guid id, UpdateAnnouncementRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var announcement = await _context.Announcements
+            .Include(a => a.Event)
+            .Include(a => a.Author)
+            .FirstOrDefaultAsync(a => a.Id == id);
+
+        if (announcement == null)
+        {
+            return NotFound();
+        }
+
+        // Only organizer can update
+        if (announcement.Event.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        // Update fields
+        if (request.Title != null) announcement.Title = request.Title;
+        if (request.Content != null) announcement.Content = request.Content;
+        if (request.IsPublished.HasValue) announcement.IsPublished = request.IsPublished.Value;
+
+        announcement.UpdatedAt = DateTime.UtcNow;
+
+        await _context.SaveChangesAsync();
+
+        return Ok(MapToAnnouncementDto(announcement));
+    }
+
+    [HttpDelete("{id}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<IActionResult> DeleteAnnouncement(Guid id)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var announcement = await _context.Announcements
+            .Include(a => a.Event)
+            .FirstOrDefaultAsync(a => a.Id == id);
+
+        if (announcement == null)
+        {
+            return NotFound();
+        }
+
+        // Only organizer can delete
+        if (announcement.Event.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        _context.Announcements.Remove(announcement);
+        await _context.SaveChangesAsync();
+
+        return NoContent();
+    }
+
+    [HttpGet("my-announcements")]
+    public async Task<ActionResult<IEnumerable<AnnouncementDto>>> GetMyAnnouncements()
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Get user registrations
+        var userRegistrationEventIds = await _context.Registrations
+            .Where(r => r.ParticipantId == userId.Value && r.Status != RegistrationStatus.Cancelled)
+            .Select(r => r.EventId)
+            .ToListAsync();
+
+        // Get announcements for those events
+        var announcements = await _context.Announcements
+            .Include(a => a.Event)
+            .Include(a => a.Author)
+            .Where(a => userRegistrationEventIds.Contains(a.EventId) && a.IsPublished)
+            .OrderByDescending(a => a.CreatedAt)
+            .ToListAsync();
+
+        return Ok(announcements.Select(MapToAnnouncementDto));
+    }
+
+    private Guid? GetCurrentUserId()
+    {
+        var userIdClaim = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+        if (Guid.TryParse(userIdClaim, out var userId))
+        {
+            return userId;
+        }
+        return null;
+    }
+
+    private static AnnouncementDto MapToAnnouncementDto(Announcement announcement)
+    {
+        return new AnnouncementDto
+        {
+            Id = announcement.Id,
+            EventId = announcement.EventId,
+            EventName = announcement.Event?.Name ?? string.Empty,
+            Title = announcement.Title,
+            Content = announcement.Content,
+            AuthorId = announcement.AuthorId,
+            AuthorName = announcement.Author?.Name ?? string.Empty,
+            CreatedAt = announcement.CreatedAt,
+            UpdatedAt = announcement.UpdatedAt,
+            IsPublished = announcement.IsPublished
+        };
+    }
+}

backend/Controllers/DashboardController.cs

@@ -0,0 +1,167 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class DashboardController : ControllerBase
+{
+    private readonly RacePlannerDbContext _context;
+
+    public DashboardController(RacePlannerDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpGet("organizer")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<OrganizerDashboardDto>> GetOrganizerDashboard()
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var events = await _context.Events
+            .Include(e => e.Registrations)
+            .ThenInclude(r => r.Payments)
+            .Where(e => e.OrganizerId == userId.Value)
+            .ToListAsync();
+
+        var totalEvents = events.Count;
+        var publishedEvents = events.Count(e => e.Status == EventStatus.Published);
+        var draftEvents = events.Count(e => e.Status == EventStatus.Draft);
+
+        var allRegistrations = events.SelectMany(e => e.Registrations).ToList();
+        var totalRegistrations = allRegistrations.Count;
+        var pendingRegistrations = allRegistrations.Count(r => r.Status == RegistrationStatus.Pending);
+        var confirmedRegistrations = allRegistrations.Count(r => r.Status == RegistrationStatus.Confirmed);
+        var cancelledRegistrations = allRegistrations.Count(r => r.Status == RegistrationStatus.Cancelled);
+
+        var totalRevenue = allRegistrations
+            .SelectMany(r => r.Payments)
+            .Sum(p => p.Amount);
+
+        var upcomingEvents = events
+            .Where(e => e.EventDate >= DateTime.UtcNow && e.EventDate <= DateTime.UtcNow.AddDays(30))
+            .OrderBy(e => e.EventDate)
+            .Take(5)
+            .Select(e => new EventSummaryDto
+            {
+                Id = e.Id,
+                Name = e.Name,
+                EventDate = e.EventDate,
+                Location = e.Location,
+                RegistrationCount = e.Registrations.Count(r => r.Status != RegistrationStatus.Cancelled),
+                MaxParticipants = e.MaxParticipants
+            })
+            .ToList();
+
+        var eventsNearCapacity = events
+            .Where(e => e.MaxParticipants.HasValue && e.Status == EventStatus.Published)
+            .Select(e => new EventCapacityDto
+            {
+                Id = e.Id,
+                Name = e.Name,
+                EventDate = e.EventDate,
+                RegistrationCount = e.Registrations.Count(r => r.Status != RegistrationStatus.Cancelled),
+                MaxParticipants = e.MaxParticipants
+            })
+            .Where(e => e.CapacityPercentage >= 80)
+            .OrderByDescending(e => e.CapacityPercentage)
+            .Take(5)
+            .ToList();
+
+        var dashboard = new OrganizerDashboardDto
+        {
+            TotalEvents = totalEvents,
+            PublishedEvents = publishedEvents,
+            DraftEvents = draftEvents,
+            TotalRegistrations = totalRegistrations,
+            PendingRegistrations = pendingRegistrations,
+            ConfirmedRegistrations = confirmedRegistrations,
+            CancelledRegistrations = cancelledRegistrations,
+            TotalRevenue = totalRevenue,
+            UpcomingEvents = upcomingEvents,
+            EventsNearCapacity = eventsNearCapacity
+        };
+
+        return Ok(dashboard);
+    }
+
+    [HttpGet("participant")]
+    public async Task<ActionResult<ParticipantDashboardDto>> GetParticipantDashboard()
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registrations = await _context.Registrations
+            .Include(r => r.Event)
+            .Where(r => r.ParticipantId == userId.Value)
+            .ToListAsync();
+
+        var totalRegistrations = registrations.Count;
+        var upcomingEvents = registrations.Count(r => r.Event.EventDate >= DateTime.UtcNow && r.Status != RegistrationStatus.Cancelled);
+        var completedEvents = registrations.Count(r => r.Event.EventDate < DateTime.UtcNow && r.Status == RegistrationStatus.Completed);
+        var cancelledRegistrations = registrations.Count(r => r.Status == RegistrationStatus.Cancelled);
+
+        var registrationSummaries = registrations
+            .OrderByDescending(r => r.Event.EventDate)
+            .Take(10)
+            .Select(r => new RegistrationSummaryDto
+            {
+                Id = r.Id,
+                EventId = r.EventId,
+                EventName = r.Event.Name,
+                EventDate = r.Event.EventDate,
+                Status = r.Status.ToString(),
+                RegisteredAt = r.CreatedAt
+            })
+            .ToList();
+
+        var upcomingEventList = registrations
+            .Where(r => r.Event.EventDate >= DateTime.UtcNow && r.Status != RegistrationStatus.Cancelled)
+            .OrderBy(r => r.Event.EventDate)
+            .Take(5)
+            .Select(r => new UpcomingEventDto
+            {
+                Id = r.EventId,
+                Name = r.Event.Name,
+                EventDate = r.Event.EventDate,
+                Location = r.Event.Location
+            })
+            .ToList();
+
+        var dashboard = new ParticipantDashboardDto
+        {
+            TotalRegistrations = totalRegistrations,
+            UpcomingEvents = upcomingEvents,
+            CompletedEvents = completedEvents,
+            CancelledRegistrations = cancelledRegistrations,
+            MyRegistrations = registrationSummaries,
+            UpcomingEventList = upcomingEventList
+        };
+
+        return Ok(dashboard);
+    }
+
+    private Guid? GetCurrentUserId()
+    {
+        var userIdClaim = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+        if (Guid.TryParse(userIdClaim, out var userId))
+        {
+            return userId;
+        }
+        return null;
+    }
+}

backend/Controllers/EventsController.cs

@@ -0,0 +1,242 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class EventsController : ControllerBase
+{
+    private readonly RacePlannerDbContext _context;
+
+    public EventsController(RacePlannerDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpPost]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<EventDto>> CreateEvent(CreateEventRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var eventEntity = new Event
+        {
+            Name = request.Name,
+            Description = request.Description,
+            EventDate = request.EventDate,
+            Location = request.Location,
+            Category = request.Category,
+            Tags = request.Tags ?? new List<string>(),
+            MaxParticipants = request.MaxParticipants,
+            OrganizerId = userId.Value,
+            Status = EventStatus.Draft
+        };
+
+        _context.Events.Add(eventEntity);
+        await _context.SaveChangesAsync();
+
+        // Load organizer for response
+        await _context.Entry(eventEntity).Reference(e => e.Organizer).LoadAsync();
+
+        return CreatedAtAction(
+            nameof(GetEvent),
+            new { id = eventEntity.Id },
+            MapToEventDto(eventEntity));
+    }
+
+    [HttpGet]
+    [AllowAnonymous]
+    public async Task<ActionResult<IEnumerable<EventDto>>> GetEvents(
+        [FromQuery] EventFilterRequest? filter = null)
+    {
+        var query = _context.Events
+            .Include(e => e.Organizer)
+            .Include(e => e.Registrations)
+            .AsQueryable();
+
+        // Apply filters
+        if (filter?.Category != null)
+        {
+            query = query.Where(e => e.Category == filter.Category);
+        }
+
+        if (filter?.Tags != null && filter.Tags.Any())
+        {
+            query = query.Where(e => e.Tags.Any(t => filter.Tags.Contains(t)));
+        }
+
+        if (filter?.FromDate != null)
+        {
+            query = query.Where(e => e.EventDate >= filter.FromDate);
+        }
+
+        if (filter?.ToDate != null)
+        {
+            query = query.Where(e => e.EventDate <= filter.ToDate);
+        }
+
+        if (filter?.Status != null && Enum.TryParse<EventStatus>(filter.Status, out var status))
+        {
+            query = query.Where(e => e.Status == status);
+        }
+
+        if (filter?.OrganizerId != null)
+        {
+            query = query.Where(e => e.OrganizerId == filter.OrganizerId);
+        }
+
+        // Default to showing published events only for anonymous users
+        if (!User.Identity?.IsAuthenticated ?? true)
+        {
+            query = query.Where(e => e.Status == EventStatus.Published);
+        }
+
+        var events = await query
+            .OrderBy(e => e.EventDate)
+            .ToListAsync();
+
+        return Ok(events.Select(MapToEventDto));
+    }
+
+    [HttpGet("{id}")]
+    [AllowAnonymous]
+    public async Task<ActionResult<EventDto>> GetEvent(Guid id)
+    {
+        var eventEntity = await _context.Events
+            .Include(e => e.Organizer)
+            .Include(e => e.Registrations)
+            .FirstOrDefaultAsync(e => e.Id == id);
+
+        if (eventEntity == null)
+        {
+            return NotFound();
+        }
+
+        // Draft events only visible to organizers
+        if (eventEntity.Status == EventStatus.Draft)
+        {
+            var userId = GetCurrentUserId();
+            if (userId == null || eventEntity.OrganizerId != userId)
+            {
+                return NotFound();
+            }
+        }
+
+        return Ok(MapToEventDto(eventEntity));
+    }
+
+    [HttpPut("{id}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<EventDto>> UpdateEvent(Guid id, UpdateEventRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var eventEntity = await _context.Events
+            .Include(e => e.Organizer)
+            .FirstOrDefaultAsync(e => e.Id == id);
+
+        if (eventEntity == null)
+        {
+            return NotFound();
+        }
+
+        // Only organizer can update their event
+        if (eventEntity.OrganizerId != userId)
+        {
+            return Forbid();
+        }
+
+        // Update fields
+        if (request.Name != null) eventEntity.Name = request.Name;
+        if (request.Description != null) eventEntity.Description = request.Description;
+        if (request.EventDate != null) eventEntity.EventDate = request.EventDate.Value;
+        if (request.Location != null) eventEntity.Location = request.Location;
+        if (request.Status != null) eventEntity.Status = request.Status.Value;
+        if (request.Category != null) eventEntity.Category = request.Category;
+        if (request.Tags != null) eventEntity.Tags = request.Tags;
+        if (request.MaxParticipants != null) eventEntity.MaxParticipants = request.MaxParticipants;
+
+        eventEntity.UpdatedAt = DateTime.UtcNow;
+
+        await _context.SaveChangesAsync();
+
+        return Ok(MapToEventDto(eventEntity));
+    }
+
+    [HttpDelete("{id}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<IActionResult> DeleteEvent(Guid id)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var eventEntity = await _context.Events.FindAsync(id);
+
+        if (eventEntity == null)
+        {
+            return NotFound();
+        }
+
+        if (eventEntity.OrganizerId != userId)
+        {
+            return Forbid();
+        }
+
+        _context.Events.Remove(eventEntity);
+        await _context.SaveChangesAsync();
+
+        return NoContent();
+    }
+
+    private Guid? GetCurrentUserId()
+    {
+        var userIdClaim = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+        if (Guid.TryParse(userIdClaim, out var userId))
+        {
+            return userId;
+        }
+        return null;
+    }
+
+    private static EventDto MapToEventDto(Event eventEntity)
+    {
+        return new EventDto
+        {
+            Id = eventEntity.Id,
+            Name = eventEntity.Name,
+            Description = eventEntity.Description,
+            EventDate = eventEntity.EventDate,
+            Location = eventEntity.Location,
+            Status = eventEntity.Status.ToString(),
+            Category = eventEntity.Category,
+            Tags = eventEntity.Tags,
+            MaxParticipants = eventEntity.MaxParticipants,
+            CurrentRegistrations = eventEntity.Registrations?.Count ?? 0,
+            CreatedAt = eventEntity.CreatedAt,
+            UpdatedAt = eventEntity.UpdatedAt,
+            Organizer = new UserSummaryDto
+            {
+                Id = eventEntity.Organizer.Id,
+                Name = eventEntity.Organizer.Name,
+                Email = eventEntity.Organizer.Email
+            }
+        };
+    }
+}

backend/Controllers/PaymentsController.cs

@@ -0,0 +1,258 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class PaymentsController : ControllerBase
+{
+    private readonly RacePlannerDbContext _context;
+
+    public PaymentsController(RacePlannerDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpPost]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<PaymentDto>> RecordPayment(CreatePaymentRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Load registration with event
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .FirstOrDefaultAsync(r => r.Id == request.RegistrationId);
+
+        if (registration == null)
+        {
+            return NotFound(new { error = "Registration not found" });
+        }
+
+        // Verify user is organizer of the event
+        if (registration.Event.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        // Check registration is not cancelled
+        if (registration.Status == RegistrationStatus.Cancelled)
+        {
+            return BadRequest(new { error = "Cannot record payment for cancelled registration" });
+        }
+
+        var payment = new Payment
+        {
+            RegistrationId = request.RegistrationId,
+            Amount = request.Amount,
+            Method = request.Method,
+            TransactionId = request.TransactionId,
+            Notes = request.Notes,
+            PaymentDate = request.PaymentDate ?? DateTime.UtcNow
+        };
+
+        _context.Payments.Add(payment);
+        await _context.SaveChangesAsync();
+
+        // Update registration status if fully paid (assuming a fixed fee amount would be known)
+        // For now, we'll just record the payment
+
+        return CreatedAtAction(
+            nameof(GetPayment),
+            new { id = payment.Id },
+            MapToPaymentDto(payment));
+    }
+
+    [HttpGet("{id}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<PaymentDto>> GetPayment(Guid id)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var payment = await _context.Payments
+            .Include(p => p.Registration)
+            .ThenInclude(r => r.Event)
+            .FirstOrDefaultAsync(p => p.Id == id);
+
+        if (payment == null)
+        {
+            return NotFound();
+        }
+
+        // Verify user is organizer
+        if (payment.Registration.Event.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        return Ok(MapToPaymentDto(payment));
+    }
+
+    [HttpGet("registration/{registrationId}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<IEnumerable<PaymentDto>>> GetRegistrationPayments(Guid registrationId)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Verify organizer has access to this registration
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .FirstOrDefaultAsync(r => r.Id == registrationId);
+
+        if (registration == null)
+        {
+            return NotFound();
+        }
+
+        if (registration.Event.OrganizerId != userId.Value)
+        {
+            return Forbid();
+        }
+
+        var payments = await _context.Payments
+            .Where(p => p.RegistrationId == registrationId)
+            .OrderByDescending(p => p.PaymentDate)
+            .ToListAsync();
+
+        return Ok(payments.Select(MapToPaymentDto));
+    }
+
+    [HttpGet("registration/{registrationId}/status")]
+    [Authorize]
+    public async Task<ActionResult<object>> GetPaymentStatus(Guid registrationId)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .Include(r => r.Payments)
+            .FirstOrDefaultAsync(r => r.Id == registrationId);
+
+        if (registration == null)
+        {
+            return NotFound();
+        }
+
+        // Participant can view their own, organizer can view any
+        var isOrganizer = registration.Event.OrganizerId == userId.Value;
+
+        if (registration.ParticipantId != userId.Value && !isOrganizer)
+        {
+            return Forbid();
+        }
+
+        var totalPaid = registration.Payments.Sum(p => p.Amount);
+        var status = totalPaid > 0 ? "paid" : "unpaid";
+
+        return Ok(new
+        {
+            RegistrationId = registrationId,
+            TotalPaid = totalPaid,
+            PaymentCount = registration.Payments.Count,
+            Status = status,
+            Payments = registration.Payments.Select(MapToPaymentDto)
+        });
+    }
+
+    [HttpGet("event/{eventId}/report")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<PaymentReportDto>> GetPaymentReport(Guid eventId)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var eventEntity = await _context.Events
+            .FirstOrDefaultAsync(e => e.Id == eventId && e.OrganizerId == userId.Value);
+
+        if (eventEntity == null)
+        {
+            return NotFound();
+        }
+
+        var registrations = await _context.Registrations
+            .Include(r => r.Participant)
+            .Include(r => r.Payments)
+            .Where(r => r.EventId == eventId && r.Status != RegistrationStatus.Cancelled)
+            .ToListAsync();
+
+        var totalCollected = registrations.Sum(r => r.Payments.Sum(p => p.Amount));
+        var totalRegistrations = registrations.Count;
+        var paidRegistrations = registrations.Count(r => r.Payments.Any());
+        var unpaidRegistrations = registrations.Count(r => !r.Payments.Any());
+
+        var report = new PaymentReportDto
+        {
+            EventId = eventId,
+            EventName = eventEntity.Name,
+            TotalCollected = totalCollected,
+            TotalPending = 0, // Would require event fee structure
+            TotalOutstanding = 0, // Would require event fee structure
+            TotalRegistrations = totalRegistrations,
+            PaidRegistrations = paidRegistrations,
+            PartialRegistrations = 0, // Would require partial payment logic
+            UnpaidRegistrations = unpaidRegistrations,
+            Registrations = registrations.Select(r => new RegistrationPaymentDto
+            {
+                RegistrationId = r.Id,
+                ParticipantName = r.Participant.Name,
+                Status = r.Status.ToString(),
+                TotalPaid = r.Payments.Sum(p => p.Amount),
+                AmountDue = 0, // Would require event fee structure
+                PaymentStatus = r.Payments.Any() ? "paid" : "unpaid",
+                Payments = r.Payments.Select(MapToPaymentDto).ToList()
+            }).ToList()
+        };
+
+        return Ok(report);
+    }
+
+    private Guid? GetCurrentUserId()
+    {
+        var userIdClaim = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+        if (Guid.TryParse(userIdClaim, out var userId))
+        {
+            return userId;
+        }
+        return null;
+    }
+
+    private static PaymentDto MapToPaymentDto(Payment payment)
+    {
+        return new PaymentDto
+        {
+            Id = payment.Id,
+            RegistrationId = payment.RegistrationId,
+            Amount = payment.Amount,
+            Method = payment.Method.ToString(),
+            TransactionId = payment.TransactionId,
+            Notes = payment.Notes,
+            PaymentDate = payment.PaymentDate,
+            CreatedAt = payment.CreatedAt
+        };
+    }
+}

backend/Controllers/RegistrationsController.cs

@@ -0,0 +1,303 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using RacePlannerApi.Data;
+using RacePlannerApi.DTOs;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+[Authorize]
+public class RegistrationsController : ControllerBase
+{
+    private readonly RacePlannerDbContext _context;
+
+    public RegistrationsController(RacePlannerDbContext context)
+    {
+        _context = context;
+    }
+
+    [HttpPost]
+    public async Task<ActionResult<RegistrationDto>> CreateRegistration(CreateRegistrationRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Check if event exists and is published
+        var eventEntity = await _context.Events
+            .FirstOrDefaultAsync(e => e.Id == request.EventId);
+
+        if (eventEntity == null)
+        {
+            return NotFound(new { error = "Event not found" });
+        }
+
+        if (eventEntity.Status != EventStatus.Published)
+        {
+            return BadRequest(new { error = "Event is not open for registration" });
+        }
+
+        // Check if already registered
+        var existingRegistration = await _context.Registrations
+            .FirstOrDefaultAsync(r => r.EventId == request.EventId && r.ParticipantId == userId.Value);
+
+        if (existingRegistration != null)
+        {
+            return Conflict(new { error = "Already registered for this event" });
+        }
+
+        // Check if event is full
+        if (eventEntity.MaxParticipants.HasValue)
+        {
+            var registrationCount = await _context.Registrations
+                .CountAsync(r => r.EventId == request.EventId && r.Status != RegistrationStatus.Cancelled);
+
+            if (registrationCount >= eventEntity.MaxParticipants.Value)
+            {
+                return BadRequest(new { error = "Event is full" });
+            }
+        }
+
+        var registration = new Registration
+        {
+            EventId = request.EventId,
+            ParticipantId = userId.Value,
+            Status = RegistrationStatus.Pending,
+            Category = request.Category,
+            EmergencyContact = request.EmergencyContact
+        };
+
+        _context.Registrations.Add(registration);
+        await _context.SaveChangesAsync();
+
+        // Load related data
+        await _context.Entry(registration)
+            .Reference(r => r.Event)
+            .LoadAsync();
+        await _context.Entry(registration)
+            .Reference(r => r.Participant)
+            .LoadAsync();
+        await _context.Entry(registration)
+            .Collection(r => r.Payments)
+            .LoadAsync();
+
+        return CreatedAtAction(
+            nameof(GetRegistration),
+            new { id = registration.Id },
+            MapToRegistrationDto(registration));
+    }
+
+    [HttpGet("{id}")]
+    public async Task<ActionResult<RegistrationDto>> GetRegistration(Guid id)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .Include(r => r.Participant)
+            .Include(r => r.Payments)
+            .FirstOrDefaultAsync(r => r.Id == id);
+
+        if (registration == null)
+        {
+            return NotFound();
+        }
+
+        // Only participant or event organizer can view
+        var isOrganizer = await _context.Events
+            .AnyAsync(e => e.Id == registration.EventId && e.OrganizerId == userId.Value);
+
+        if (registration.ParticipantId != userId.Value && !isOrganizer)
+        {
+            return Forbid();
+        }
+
+        return Ok(MapToRegistrationDto(registration));
+    }
+
+    [HttpGet("my-registrations")]
+    public async Task<ActionResult<IEnumerable<RegistrationDto>>> GetMyRegistrations()
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registrations = await _context.Registrations
+            .Include(r => r.Event)
+            .Include(r => r.Participant)
+            .Include(r => r.Payments)
+            .Where(r => r.ParticipantId == userId.Value)
+            .OrderBy(r => r.Event.EventDate)
+            .ToListAsync();
+
+        return Ok(registrations.Select(MapToRegistrationDto));
+    }
+
+    [HttpGet("event/{eventId}")]
+    [Authorize(Roles = "Organizer")]
+    public async Task<ActionResult<IEnumerable<RegistrationDto>>> GetEventRegistrations(Guid eventId)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        // Verify user is organizer of this event
+        var eventEntity = await _context.Events
+            .FirstOrDefaultAsync(e => e.Id == eventId && e.OrganizerId == userId.Value);
+
+        if (eventEntity == null)
+        {
+            return NotFound();
+        }
+
+        var registrations = await _context.Registrations
+            .Include(r => r.Event)
+            .Include(r => r.Participant)
+            .Include(r => r.Payments)
+            .Where(r => r.EventId == eventId)
+            .OrderBy(r => r.CreatedAt)
+            .ToListAsync();
+
+        return Ok(registrations.Select(MapToRegistrationDto));
+    }
+
+    [HttpPut("{id}")]
+    public async Task<ActionResult<RegistrationDto>> UpdateRegistration(Guid id, UpdateRegistrationRequest request)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .FirstOrDefaultAsync(r => r.Id == id);
+
+        if (registration == null)
+        {
+            return NotFound();
+        }
+
+        // Participants can only update their own registrations
+        // Organizers can update any registration for their events
+        var isOrganizer = registration.Event.OrganizerId == userId.Value;
+
+        if (registration.ParticipantId != userId.Value && !isOrganizer)
+        {
+            return Forbid();
+        }
+
+        // Update fields
+        if (request.Status.HasValue && isOrganizer)
+        {
+            registration.Status = request.Status.Value;
+        }
+
+        if (request.Category != null)
+        {
+            registration.Category = request.Category;
+        }
+
+        if (request.EmergencyContact != null)
+        {
+            registration.EmergencyContact = request.EmergencyContact;
+        }
+
+        registration.UpdatedAt = DateTime.UtcNow;
+
+        await _context.SaveChangesAsync();
+
+        // Reload related data
+        await _context.Entry(registration)
+            .Reference(r => r.Participant)
+            .LoadAsync();
+        await _context.Entry(registration)
+            .Collection(r => r.Payments)
+            .LoadAsync();
+
+        return Ok(MapToRegistrationDto(registration));
+    }
+
+    [HttpPost("{id}/cancel")]
+    public async Task<ActionResult<RegistrationDto>> CancelRegistration(Guid id)
+    {
+        var userId = GetCurrentUserId();
+        if (userId == null)
+        {
+            return Unauthorized();
+        }
+
+        var registration = await _context.Registrations
+            .Include(r => r.Event)
+            .Include(r => r.Participant)
+            .Include(r => r.Payments)
+            .FirstOrDefaultAsync(r => r.Id == id);
+
+        if (registration == null)
+        {
+            return NotFound();
+        }
+
+        // Only participant or event organizer can cancel
+        var isOrganizer = registration.Event.OrganizerId == userId.Value;
+
+        if (registration.ParticipantId != userId.Value && !isOrganizer)
+        {
+            return Forbid();
+        }
+
+        registration.Status = RegistrationStatus.Cancelled;
+        registration.UpdatedAt = DateTime.UtcNow;
+
+        await _context.SaveChangesAsync();
+
+        return Ok(MapToRegistrationDto(registration));
+    }
+
+    private Guid? GetCurrentUserId()
+    {
+        var userIdClaim = User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value;
+        if (Guid.TryParse(userIdClaim, out var userId))
+        {
+            return userId;
+        }
+        return null;
+    }
+
+    private static RegistrationDto MapToRegistrationDto(Registration registration)
+    {
+        var totalPaid = registration.Payments?.Sum(p => p.Amount) ?? 0;
+
+        return new RegistrationDto
+        {
+            Id = registration.Id,
+            EventId = registration.EventId,
+            EventName = registration.Event?.Name ?? string.Empty,
+            EventDate = registration.Event?.EventDate ?? DateTime.MinValue,
+            ParticipantId = registration.ParticipantId,
+            ParticipantName = registration.Participant?.Name ?? string.Empty,
+            ParticipantEmail = registration.Participant?.Email ?? string.Empty,
+            Status = registration.Status.ToString(),
+            Category = registration.Category,
+            EmergencyContact = registration.EmergencyContact,
+            CreatedAt = registration.CreatedAt,
+            UpdatedAt = registration.UpdatedAt,
+            TotalPaid = totalPaid,
+            AmountDue = 0 // Will be calculated based on event fee if needed
+        };
+    }
+}

backend/DTOs/AnnouncementDtos.cs

@@ -0,0 +1,42 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace RacePlannerApi.DTOs;
+
+public class CreateAnnouncementRequest
+{
+    [Required]
+    public Guid EventId { get; set; }
+
+    [Required]
+    [MaxLength(200)]
+    public string Title { get; set; } = string.Empty;
+
+    [Required]
+    [MaxLength(5000)]
+    public string Content { get; set; } = string.Empty;
+}
+
+public class UpdateAnnouncementRequest
+{
+    [MaxLength(200)]
+    public string? Title { get; set; }
+
+    [MaxLength(5000)]
+    public string? Content { get; set; }
+
+    public bool? IsPublished { get; set; }
+}
+
+public class AnnouncementDto
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string EventName { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+    public string Content { get; set; } = string.Empty;
+    public Guid AuthorId { get; set; }
+    public string AuthorName { get; set; } = string.Empty;
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public bool IsPublished { get; set; }
+}

backend/DTOs/DashboardDtos.cs

@@ -0,0 +1,66 @@
+namespace RacePlannerApi.DTOs;
+
+public class OrganizerDashboardDto
+{
+    public int TotalEvents { get; set; }
+    public int PublishedEvents { get; set; }
+    public int DraftEvents { get; set; }
+    public int TotalRegistrations { get; set; }
+    public int PendingRegistrations { get; set; }
+    public int ConfirmedRegistrations { get; set; }
+    public int CancelledRegistrations { get; set; }
+    public decimal TotalRevenue { get; set; }
+    public List<EventSummaryDto> UpcomingEvents { get; set; } = new();
+    public List<EventCapacityDto> EventsNearCapacity { get; set; } = new();
+}
+
+public class EventSummaryDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public string Location { get; set; } = string.Empty;
+    public int RegistrationCount { get; set; }
+    public int? MaxParticipants { get; set; }
+}
+
+public class EventCapacityDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public int RegistrationCount { get; set; }
+    public int? MaxParticipants { get; set; }
+    public double CapacityPercentage => MaxParticipants.HasValue && MaxParticipants.Value > 0
+        ? (double)RegistrationCount / MaxParticipants.Value * 100
+        : 0;
+}
+
+public class ParticipantDashboardDto
+{
+    public int TotalRegistrations { get; set; }
+    public int UpcomingEvents { get; set; }
+    public int CompletedEvents { get; set; }
+    public int CancelledRegistrations { get; set; }
+    public List<RegistrationSummaryDto> MyRegistrations { get; set; } = new();
+    public List<UpcomingEventDto> UpcomingEventList { get; set; } = new();
+}
+
+public class RegistrationSummaryDto
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string EventName { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public string Status { get; set; } = string.Empty;
+    public DateTime RegisteredAt { get; set; }
+}
+
+public class UpcomingEventDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public string Location { get; set; } = string.Empty;
+    public int DaysUntil => (EventDate - DateTime.UtcNow).Days;
+}

backend/DTOs/EventDtos.cs

@@ -0,0 +1,85 @@
+using System.ComponentModel.DataAnnotations;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.DTOs;
+
+public class CreateEventRequest
+{
+    [Required]
+    [MaxLength(200)]
+    public string Name { get; set; } = string.Empty;
+
+    [MaxLength(2000)]
+    public string Description { get; set; } = string.Empty;
+
+    [Required]
+    public DateTime EventDate { get; set; }
+
+    [Required]
+    [MaxLength(500)]
+    public string Location { get; set; } = string.Empty;
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    public List<string> Tags { get; set; } = new();
+
+    public int? MaxParticipants { get; set; }
+}
+
+public class UpdateEventRequest
+{
+    [MaxLength(200)]
+    public string? Name { get; set; }
+
+    [MaxLength(2000)]
+    public string? Description { get; set; }
+
+    public DateTime? EventDate { get; set; }
+
+    [MaxLength(500)]
+    public string? Location { get; set; }
+
+    public EventStatus? Status { get; set; }
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    public List<string>? Tags { get; set; }
+
+    public int? MaxParticipants { get; set; }
+}
+
+public class EventDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string Description { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public string Location { get; set; } = string.Empty;
+    public string Status { get; set; } = string.Empty;
+    public string? Category { get; set; }
+    public List<string> Tags { get; set; } = new();
+    public int? MaxParticipants { get; set; }
+    public int CurrentRegistrations { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+    public UserSummaryDto Organizer { get; set; } = null!;
+}
+
+public class EventFilterRequest
+{
+    public string? Category { get; set; }
+    public List<string>? Tags { get; set; }
+    public DateTime? FromDate { get; set; }
+    public DateTime? ToDate { get; set; }
+    public string? Status { get; set; }
+    public Guid? OrganizerId { get; set; }
+}
+
+public class UserSummaryDto
+{
+    public Guid Id { get; set; }
+    public string Name { get; set; } = string.Empty;
+    public string Email { get; set; } = string.Empty;
+}

backend/DTOs/PaymentDtos.cs

@@ -0,0 +1,62 @@
+using System.ComponentModel.DataAnnotations;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.DTOs;
+
+public class CreatePaymentRequest
+{
+    [Required]
+    public Guid RegistrationId { get; set; }
+
+    [Required]
+    [Range(0.01, double.MaxValue)]
+    public decimal Amount { get; set; }
+
+    [Required]
+    public PaymentMethod Method { get; set; }
+
+    [MaxLength(100)]
+    public string? TransactionId { get; set; }
+
+    [MaxLength(500)]
+    public string? Notes { get; set; }
+
+    public DateTime? PaymentDate { get; set; }
+}
+
+public class PaymentDto
+{
+    public Guid Id { get; set; }
+    public Guid RegistrationId { get; set; }
+    public decimal Amount { get; set; }
+    public string Method { get; set; } = string.Empty;
+    public string? TransactionId { get; set; }
+    public string? Notes { get; set; }
+    public DateTime PaymentDate { get; set; }
+    public DateTime CreatedAt { get; set; }
+}
+
+public class PaymentReportDto
+{
+    public Guid EventId { get; set; }
+    public string EventName { get; set; } = string.Empty;
+    public decimal TotalCollected { get; set; }
+    public decimal TotalPending { get; set; }
+    public decimal TotalOutstanding { get; set; }
+    public int TotalRegistrations { get; set; }
+    public int PaidRegistrations { get; set; }
+    public int PartialRegistrations { get; set; }
+    public int UnpaidRegistrations { get; set; }
+    public List<RegistrationPaymentDto> Registrations { get; set; } = new();
+}
+
+public class RegistrationPaymentDto
+{
+    public Guid RegistrationId { get; set; }
+    public string ParticipantName { get; set; } = string.Empty;
+    public string Status { get; set; } = string.Empty;
+    public decimal TotalPaid { get; set; }
+    public decimal AmountDue { get; set; }
+    public string PaymentStatus { get; set; } = string.Empty;
+    public List<PaymentDto> Payments { get; set; } = new();
+}

backend/DTOs/RegistrationDtos.cs

@@ -0,0 +1,45 @@
+using System.ComponentModel.DataAnnotations;
+using RacePlannerApi.Models;
+
+namespace RacePlannerApi.DTOs;
+
+public class CreateRegistrationRequest
+{
+    [Required]
+    public Guid EventId { get; set; }
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    [MaxLength(200)]
+    public string? EmergencyContact { get; set; }
+}
+
+public class UpdateRegistrationRequest
+{
+    public RegistrationStatus? Status { get; set; }
+
+    [MaxLength(100)]
+    public string? Category { get; set; }
+
+    [MaxLength(200)]
+    public string? EmergencyContact { get; set; }
+}
+
+public class RegistrationDto
+{
+    public Guid Id { get; set; }
+    public Guid EventId { get; set; }
+    public string EventName { get; set; } = string.Empty;
+    public DateTime EventDate { get; set; }
+    public Guid ParticipantId { get; set; }
+    public string ParticipantName { get; set; } = string.Empty;
+    public string ParticipantEmail { get; set; } = string.Empty;
+    public string Status { get; set; } = string.Empty;
+    public string? Category { get; set; }
+    public string? EmergencyContact { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public DateTime? UpdatedAt { get; set; }
+    public decimal TotalPaid { get; set; }
+    public decimal AmountDue { get; set; }
+}

openspec/changes/new-raceplanner-app/tasks.md

@@ -18,20 +18,20 @@
 
 ## 3. User Authentication (user-auth)
 
-- [ ] 3.1 Implement user registration endpoint
-- [ ] 3.2 Implement user login endpoint with JWT
-- [ ] 3.3 Create authentication middleware
-- [ ] 3.4 Implement role-based access control middleware
+- [x] 3.1 Implement user registration endpoint
+- [x] 3.2 Implement user login endpoint with JWT
+- [x] 3.3 Create authentication middleware
+- [x] 3.4 Implement role-based access control middleware
 - [ ] 3.5 Create registration form component
 - [ ] 3.6 Create login form component
 - [ ] 3.7 Implement logout functionality
 
 ## 4. Event Management (event-management)
 
-- [ ] 4.1 Implement create event endpoint
-- [ ] 4.2 Implement update event endpoint
-- [ ] 4.3 Implement list events endpoint with filtering
-- [ ] 4.4 Implement get event details endpoint
+- [x] 4.1 Implement create event endpoint
+- [x] 4.2 Implement update event endpoint
+- [x] 4.3 Implement list events endpoint with filtering
+- [x] 4.4 Implement get event details endpoint
 - [ ] 4.5 Create event creation form component
 - [ ] 4.6 Create event editing form component
 - [ ] 4.7 Create event list view with filters
@@ -39,36 +39,36 @@
 
 ## 5. Registration System (registration-system)
 
-- [ ] 5.1 Implement registration endpoint
-- [ ] 5.2 Implement registration status update endpoint
-- [ ] 5.3 Implement cancel registration endpoint
+- [x] 5.1 Implement registration endpoint
+- [x] 5.2 Implement registration status update endpoint
+- [x] 5.3 Implement cancel registration endpoint
 - [ ] 5.4 Create registration form component
 - [ ] 5.5 Create my registrations list component
 - [ ] 5.6 Implement registration status display
 
 ## 6. Payment Tracking (payment-tracking)
 
-- [ ] 6.1 Implement record payment endpoint
-- [ ] 6.2 Implement payment status endpoint
-- [ ] 6.3 Implement payment report endpoint
+- [x] 6.1 Implement record payment endpoint
+- [x] 6.2 Implement payment status endpoint
+- [x] 6.3 Implement payment report endpoint
 - [ ] 6.4 Create payment recording form component
 - [ ] 6.5 Create payment status display component
 - [ ] 6.6 Create payment report view
 
 ## 7. Announcements (announcements)
 
-- [ ] 7.1 Implement create announcement endpoint
-- [ ] 7.2 Implement edit announcement endpoint
-- [ ] 7.3 Implement delete announcement endpoint
-- [ ] 7.4 Implement list announcements endpoint
+- [x] 7.1 Implement create announcement endpoint
+- [x] 7.2 Implement edit announcement endpoint
+- [x] 7.3 Implement delete announcement endpoint
+- [x] 7.4 Implement list announcements endpoint
 - [ ] 7.5 Create announcement creation form
 - [ ] 7.6 Create announcement list component
 - [ ] 7.7 Implement notification system
 
 ## 8. Dashboard (dashboard)
 
-- [ ] 8.1 Implement organizer metrics endpoint
-- [ ] 8.2 Implement participant registrations endpoint
+- [x] 8.1 Implement organizer metrics endpoint
+- [x] 8.2 Implement participant registrations endpoint
 - [ ] 8.3 Create organizer dashboard component
 - [ ] 8.4 Create participant dashboard component
 - [ ] 8.5 Add quick action buttons