From da70cf4b136b98964da52aaa57734b33d559c74e Mon Sep 17 00:00:00 2001
From: WorkClub Automation <automation@workclub.local>
Date: Wed, 18 Mar 2026 14:15:33 +0100
Subject: [PATCH] feat: Enrich DTOs and UI to display member names instead of
 UUIDs for task assignees, creators, and shift signups.

---
 backend/WorkClub.Api/Services/ShiftService.cs |  62 ++---
 backend/WorkClub.Api/Services/TaskService.cs  | 232 +++++++++++-------
 .../Shifts/DTOs/ShiftDetailDto.cs             |   8 +-
 .../Tasks/DTOs/TaskDetailDto.cs               |  24 +-
 .../Tasks/DTOs/TaskListDto.cs                 |  13 +-
 docker-compose.yml                            |   8 +-
 .../src/app/(protected)/shifts/[id]/page.tsx  |   6 +-
 .../src/app/(protected)/tasks/[id]/page.tsx   |   4 +-
 frontend/src/app/(protected)/tasks/page.tsx   |   2 +-
 frontend/src/auth/auth.ts                     |  28 ++-
 frontend/src/hooks/useShifts.ts               |   1 +
 frontend/src/hooks/useTasks.ts                |   3 +
 .../replace-uuids-with-names/.openspec.yaml   |   2 +
 .../replace-uuids-with-names/design.md        |  99 ++++++++
 .../replace-uuids-with-names/proposal.md      |  34 +++
 .../specs/member-name-enrichment/spec.md      |  43 ++++
 .../changes/replace-uuids-with-names/tasks.md |  41 ++++
 17 files changed, 453 insertions(+), 157 deletions(-)
 create mode 100644 openspec/changes/replace-uuids-with-names/.openspec.yaml
 create mode 100644 openspec/changes/replace-uuids-with-names/design.md
 create mode 100644 openspec/changes/replace-uuids-with-names/proposal.md
 create mode 100644 openspec/changes/replace-uuids-with-names/specs/member-name-enrichment/spec.md
 create mode 100644 openspec/changes/replace-uuids-with-names/tasks.md

diff --git a/backend/WorkClub.Api/Services/ShiftService.cs b/backend/WorkClub.Api/Services/ShiftService.cs
index 6d5954a..d4584c0 100644
--- a/backend/WorkClub.Api/Services/ShiftService.cs
+++ b/backend/WorkClub.Api/Services/ShiftService.cs
@@ -76,26 +76,27 @@ public class ShiftService
     {
         var shift = await _context.Shifts.FindAsync(id);
 
-        if (shift == null)
-            return null;
+  if (shift == null)
+    return null;
 
-        var signups = await (from ss in _context.ShiftSignups
-                             where ss.ShiftId == id
-                             join m in _context.Members on ss.MemberId equals m.Id
-                             orderby ss.SignedUpAt
-                             select new { ss.Id, ss.MemberId, m.ExternalUserId, ss.SignedUpAt })
-                            .ToListAsync();
+  var signups = await (from ss in _context.ShiftSignups
+    where ss.ShiftId == id
+    join m in _context.Members on ss.MemberId equals m.Id
+    orderby ss.SignedUpAt
+    select new { ss.Id, ss.MemberId, m.DisplayName, m.ExternalUserId, ss.SignedUpAt })
+    .ToListAsync();
 
-        var signupDtos = signups.Select(ss => new ShiftSignupDto(
-            ss.Id,
-            ss.MemberId,
-            ss.ExternalUserId,
-            ss.SignedUpAt
-        )).ToList();
+  var signupDtos = signups.Select(ss => new ShiftSignupDto(
+    ss.Id,
+    ss.MemberId,
+    ss.DisplayName,
+    ss.ExternalUserId,
+    ss.SignedUpAt
+  )).ToList();
 
-        var isSignedUp = currentExternalUserId != null && signupDtos.Any(s => s.ExternalUserId == currentExternalUserId);
+  var isSignedUp = currentExternalUserId != null && signupDtos.Any(s => s.ExternalUserId == currentExternalUserId);
 
-        return new ShiftDetailDto(
+  return new ShiftDetailDto(
             shift.Id,
             shift.Title,
             shift.Description,
@@ -190,23 +191,24 @@ public class ShiftService
             return (null, "Shift was modified by another user. Please refresh and try again.", true);
         }
 
-        var signups = await (from ss in _context.ShiftSignups
-                             where ss.ShiftId == id
-                             join m in _context.Members on ss.MemberId equals m.Id
-                             orderby ss.SignedUpAt
-                             select new { ss.Id, ss.MemberId, m.ExternalUserId, ss.SignedUpAt })
-                            .ToListAsync();
+  var signups = await (from ss in _context.ShiftSignups
+    where ss.ShiftId == id
+    join m in _context.Members on ss.MemberId equals m.Id
+    orderby ss.SignedUpAt
+    select new { ss.Id, ss.MemberId, m.DisplayName, m.ExternalUserId, ss.SignedUpAt })
+    .ToListAsync();
 
-        var signupDtos = signups.Select(ss => new ShiftSignupDto(
-            ss.Id,
-            ss.MemberId,
-            ss.ExternalUserId,
-            ss.SignedUpAt
-        )).ToList();
+  var signupDtos = signups.Select(ss => new ShiftSignupDto(
+    ss.Id,
+    ss.MemberId,
+    ss.DisplayName,
+    ss.ExternalUserId,
+    ss.SignedUpAt
+  )).ToList();
 
-        var isSignedUp = currentExternalUserId != null && signupDtos.Any(s => s.ExternalUserId == currentExternalUserId);
+  var isSignedUp = currentExternalUserId != null && signupDtos.Any(s => s.ExternalUserId == currentExternalUserId);
 
-        var dto = new ShiftDetailDto(
+  var dto = new ShiftDetailDto(
             shift.Id,
             shift.Title,
             shift.Description,
diff --git a/backend/WorkClub.Api/Services/TaskService.cs b/backend/WorkClub.Api/Services/TaskService.cs
index 797ac7c..5b17fbf 100644
--- a/backend/WorkClub.Api/Services/TaskService.cs
+++ b/backend/WorkClub.Api/Services/TaskService.cs
@@ -30,67 +30,89 @@ public class TaskService
             }
         }
 
-        var total = await query.CountAsync();
+  var total = await query.CountAsync();
 
-        var items = await query
-            .OrderBy(w => w.CreatedAt)
-            .Skip((page - 1) * pageSize)
-            .Take(pageSize)
-            .ToListAsync();
+  var items = await query
+    .OrderBy(w => w.CreatedAt)
+    .Skip((page - 1) * pageSize)
+    .Take(pageSize)
+    .ToListAsync();
 
-        Guid? memberId = null;
-        if (currentExternalUserId != null)
-        {
-            var tenantId = _tenantProvider.GetTenantId();
-            memberId = await _context.Members
-                .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
-                .Select(m => m.Id)
-                .FirstOrDefaultAsync();
-        }
+  // Get current member ID for IsAssignedToMe check
+  Guid? currentMemberId = null;
+  if (currentExternalUserId != null)
+  {
+    var tenantId = _tenantProvider.GetTenantId();
+    currentMemberId = await _context.Members
+      .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
+      .Select(m => m.Id)
+      .FirstOrDefaultAsync();
+  }
 
-        var itemDtos = items.Select(w => new TaskListItemDto(
-            w.Id,
-            w.Title,
-            w.Status.ToString(),
-            w.AssigneeId,
-            w.CreatedAt,
-            memberId != null && w.AssigneeId == memberId
-        )).ToList();
+  // Get all assignee IDs to fetch their names in bulk
+  var assigneeIds = items.Where(w => w.AssigneeId.HasValue).Select(w => w.AssigneeId!.Value).Distinct().ToList();
+  var assigneeNames = await _context.Members
+    .Where(m => assigneeIds.Contains(m.Id))
+    .Select(m => new { m.Id, m.DisplayName })
+    .ToDictionaryAsync(m => m.Id, m => m.DisplayName);
 
-        return new TaskListDto(itemDtos, total, page, pageSize);
-    }
+  var itemDtos = items.Select(w => new TaskListItemDto(
+    w.Id,
+    w.Title,
+    w.Status.ToString(),
+    w.AssigneeId,
+    w.AssigneeId.HasValue && assigneeNames.TryGetValue(w.AssigneeId.Value, out var name) ? name : null,
+    w.CreatedAt,
+    currentMemberId != null && w.AssigneeId == currentMemberId
+  )).ToList();
 
-    public async Task<TaskDetailDto?> GetTaskByIdAsync(Guid id, string? currentExternalUserId = null)
-    {
-        var workItem = await _context.WorkItems.FindAsync(id);
+  return new TaskListDto(itemDtos, total, page, pageSize);
+}
 
-        if (workItem == null)
-            return null;
+public async Task<TaskDetailDto?> GetTaskByIdAsync(Guid id, string? currentExternalUserId = null)
+{
+  var workItem = await _context.WorkItems.FindAsync(id);
 
-        Guid? memberId = null;
-        if (currentExternalUserId != null)
-        {
-            var tenantId = _tenantProvider.GetTenantId();
-            memberId = await _context.Members
-                .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
-                .Select(m => m.Id)
-                .FirstOrDefaultAsync();
-        }
+  if (workItem == null)
+    return null;
 
-        return new TaskDetailDto(
-            workItem.Id,
-            workItem.Title,
-            workItem.Description,
-            workItem.Status.ToString(),
-            workItem.AssigneeId,
-            workItem.CreatedById,
-            workItem.ClubId,
-            workItem.DueDate,
-            workItem.CreatedAt,
-            workItem.UpdatedAt,
-            memberId != null && workItem.AssigneeId == memberId
-        );
-    }
+  // Get current member ID for IsAssignedToMe check
+  Guid? currentMemberId = null;
+  if (currentExternalUserId != null)
+  {
+    var tenantId = _tenantProvider.GetTenantId();
+    currentMemberId = await _context.Members
+      .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
+      .Select(m => m.Id)
+      .FirstOrDefaultAsync();
+  }
+
+  // Fetch assignee and creator names
+  var memberIds = new List<Guid>();
+  if (workItem.AssigneeId.HasValue) memberIds.Add(workItem.AssigneeId.Value);
+  memberIds.Add(workItem.CreatedById);
+
+  var memberNames = await _context.Members
+    .Where(m => memberIds.Contains(m.Id))
+    .Select(m => new { m.Id, m.DisplayName })
+    .ToDictionaryAsync(m => m.Id, m => m.DisplayName);
+
+  return new TaskDetailDto(
+    workItem.Id,
+    workItem.Title,
+    workItem.Description,
+    workItem.Status.ToString(),
+    workItem.AssigneeId,
+    workItem.AssigneeId.HasValue && memberNames.TryGetValue(workItem.AssigneeId.Value, out var assigneeName) ? assigneeName : null,
+    workItem.CreatedById,
+    memberNames.TryGetValue(workItem.CreatedById, out var createdByName) ? createdByName : null,
+    workItem.ClubId,
+    workItem.DueDate,
+    workItem.CreatedAt,
+    workItem.UpdatedAt,
+    currentMemberId != null && workItem.AssigneeId == currentMemberId
+  );
+}
 
     public async Task<(TaskDetailDto? task, string? error)> CreateTaskAsync(CreateTaskRequest request, Guid createdById)
     {
@@ -111,24 +133,35 @@ public class TaskService
             UpdatedAt = DateTimeOffset.UtcNow
         };
 
-        _context.WorkItems.Add(workItem);
-        await _context.SaveChangesAsync();
+  _context.WorkItems.Add(workItem);
+  await _context.SaveChangesAsync();
 
-        var dto = new TaskDetailDto(
-            workItem.Id,
-            workItem.Title,
-            workItem.Description,
-            workItem.Status.ToString(),
-            workItem.AssigneeId,
-            workItem.CreatedById,
-            workItem.ClubId,
-            workItem.DueDate,
-            workItem.CreatedAt,
-            workItem.UpdatedAt,
-            false
-        );
+  // Fetch creator and assignee names
+  var memberIds = new List<Guid> { createdById };
+  if (workItem.AssigneeId.HasValue) memberIds.Add(workItem.AssigneeId.Value);
 
-        return (dto, null);
+  var memberNames = await _context.Members
+    .Where(m => memberIds.Contains(m.Id))
+    .Select(m => new { m.Id, m.DisplayName })
+    .ToDictionaryAsync(m => m.Id, m => m.DisplayName);
+
+  var dto = new TaskDetailDto(
+    workItem.Id,
+    workItem.Title,
+    workItem.Description,
+    workItem.Status.ToString(),
+    workItem.AssigneeId,
+    workItem.AssigneeId.HasValue && memberNames.TryGetValue(workItem.AssigneeId.Value, out var assigneeName) ? assigneeName : null,
+    workItem.CreatedById,
+    memberNames.TryGetValue(workItem.CreatedById, out var createdByName) ? createdByName : null,
+    workItem.ClubId,
+    workItem.DueDate,
+    workItem.CreatedAt,
+    workItem.UpdatedAt,
+    false
+  );
+
+  return (dto, null);
     }
 
     public async Task<(TaskDetailDto? task, string? error, bool isConflict)> UpdateTaskAsync(Guid id, UpdateTaskRequest request, string? currentExternalUserId = null)
@@ -176,32 +209,45 @@ public class TaskService
             return (null, "Task was modified by another user. Please refresh and try again.", true);
         }
 
-        Guid? memberId = null;
-        if (currentExternalUserId != null)
-        {
-            var tenantId = _tenantProvider.GetTenantId();
-            memberId = await _context.Members
-                .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
-                .Select(m => m.Id)
-                .FirstOrDefaultAsync();
-        }
+  // Get current member ID for IsAssignedToMe check
+  Guid? currentMemberId = null;
+  if (currentExternalUserId != null)
+  {
+    var tenantId = _tenantProvider.GetTenantId();
+    currentMemberId = await _context.Members
+      .Where(m => m.ExternalUserId == currentExternalUserId && m.TenantId == tenantId)
+      .Select(m => m.Id)
+      .FirstOrDefaultAsync();
+  }
 
-        var dto = new TaskDetailDto(
-            workItem.Id,
-            workItem.Title,
-            workItem.Description,
-            workItem.Status.ToString(),
-            workItem.AssigneeId,
-            workItem.CreatedById,
-            workItem.ClubId,
-            workItem.DueDate,
-            workItem.CreatedAt,
-            workItem.UpdatedAt,
-            memberId != null && workItem.AssigneeId == memberId
-        );
+  // Fetch assignee and creator names
+  var memberIds = new List<Guid>();
+  if (workItem.AssigneeId.HasValue) memberIds.Add(workItem.AssigneeId.Value);
+  memberIds.Add(workItem.CreatedById);
 
-        return (dto, null, false);
-    }
+  var memberNames = await _context.Members
+    .Where(m => memberIds.Contains(m.Id))
+    .Select(m => new { m.Id, m.DisplayName })
+    .ToDictionaryAsync(m => m.Id, m => m.DisplayName);
+
+  var dto = new TaskDetailDto(
+    workItem.Id,
+    workItem.Title,
+    workItem.Description,
+    workItem.Status.ToString(),
+    workItem.AssigneeId,
+    workItem.AssigneeId.HasValue && memberNames.TryGetValue(workItem.AssigneeId.Value, out var assigneeName) ? assigneeName : null,
+    workItem.CreatedById,
+    memberNames.TryGetValue(workItem.CreatedById, out var createdByName) ? createdByName : null,
+    workItem.ClubId,
+    workItem.DueDate,
+    workItem.CreatedAt,
+    workItem.UpdatedAt,
+    currentMemberId != null && workItem.AssigneeId == currentMemberId
+  );
+
+  return (dto, null, false);
+}
 
     public async Task<bool> DeleteTaskAsync(Guid id)
     {
diff --git a/backend/WorkClub.Application/Shifts/DTOs/ShiftDetailDto.cs b/backend/WorkClub.Application/Shifts/DTOs/ShiftDetailDto.cs
index 4e450e9..29457af 100644
--- a/backend/WorkClub.Application/Shifts/DTOs/ShiftDetailDto.cs
+++ b/backend/WorkClub.Application/Shifts/DTOs/ShiftDetailDto.cs
@@ -17,7 +17,9 @@ public record ShiftDetailDto(
 );
 
 public record ShiftSignupDto(
-    Guid Id,
-    Guid MemberId, string? ExternalUserId,
-    DateTimeOffset SignedUpAt
+  Guid Id,
+  Guid MemberId,
+  string? MemberName,
+  string? ExternalUserId,
+  DateTimeOffset SignedUpAt
 );
diff --git a/backend/WorkClub.Application/Tasks/DTOs/TaskDetailDto.cs b/backend/WorkClub.Application/Tasks/DTOs/TaskDetailDto.cs
index e05dc7f..e7e19fe 100644
--- a/backend/WorkClub.Application/Tasks/DTOs/TaskDetailDto.cs
+++ b/backend/WorkClub.Application/Tasks/DTOs/TaskDetailDto.cs
@@ -1,15 +1,17 @@
 namespace WorkClub.Application.Tasks.DTOs;
 
 public record TaskDetailDto(
-    Guid Id,
-    string Title,
-    string? Description,
-    string Status,
-    Guid? AssigneeId,
-    Guid CreatedById,
-    Guid ClubId,
-    DateTimeOffset? DueDate,
-    DateTimeOffset CreatedAt,
-    DateTimeOffset UpdatedAt,
-    bool IsAssignedToMe
+  Guid Id,
+  string Title,
+  string? Description,
+  string Status,
+  Guid? AssigneeId,
+  string? AssigneeName,
+  Guid CreatedById,
+  string? CreatedByName,
+  Guid ClubId,
+  DateTimeOffset? DueDate,
+  DateTimeOffset CreatedAt,
+  DateTimeOffset UpdatedAt,
+  bool IsAssignedToMe
 );
diff --git a/backend/WorkClub.Application/Tasks/DTOs/TaskListDto.cs b/backend/WorkClub.Application/Tasks/DTOs/TaskListDto.cs
index 0c75d7f..c56d2e6 100644
--- a/backend/WorkClub.Application/Tasks/DTOs/TaskListDto.cs
+++ b/backend/WorkClub.Application/Tasks/DTOs/TaskListDto.cs
@@ -8,10 +8,11 @@ public record TaskListDto(
 );
 
 public record TaskListItemDto(
-    Guid Id,
-    string Title,
-    string Status,
-    Guid? AssigneeId,
-    DateTimeOffset CreatedAt,
-    bool IsAssignedToMe
+  Guid Id,
+  string Title,
+  string Status,
+  Guid? AssigneeId,
+  string? AssigneeName,
+  DateTimeOffset CreatedAt,
+  bool IsAssignedToMe
 );
diff --git a/docker-compose.yml b/docker-compose.yml
index dd2300a..480ec44 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -39,6 +39,9 @@ services:
       KC_DB_PASSWORD: keycloakpass
       KC_HEALTH_ENABLED: "true"
       KC_LOG_LEVEL: INFO
+      KC_HOSTNAME: "http://localhost:8080"
+      KC_HOSTNAME_STRICT: "false"
+      KC_PROXY: "edge"
     ports:
       - "8080:8080"
     volumes:
@@ -66,6 +69,8 @@ services:
       Keycloak__TokenValidationParameters__ValidateIssuer: "false"
     ports:
       - "5001:8080"
+    extra_hosts:
+      - "localhost:host-gateway"
     volumes:
       - ./backend:/app:cached
     depends_on:
@@ -84,8 +89,9 @@ services:
     environment:
       NEXT_PUBLIC_API_URL: "http://localhost:5001"
       API_INTERNAL_URL: "http://dotnet-api:8080"
-      NEXTAUTH_URL: "http://localhost:3000"
       NEXTAUTH_SECRET: "dev-secret-change-in-production-use-openssl-rand-base64-32"
+      AUTH_SECRET: "dev-secret-change-in-production-use-openssl-rand-base64-32"
+      AUTH_TRUST_HOST: "true"
       KEYCLOAK_CLIENT_ID: "workclub-app"
       KEYCLOAK_CLIENT_SECRET: "dev-secret-workclub-api-change-in-production"
       KEYCLOAK_ISSUER: "http://localhost:8080/realms/workclub"
diff --git a/frontend/src/app/(protected)/shifts/[id]/page.tsx b/frontend/src/app/(protected)/shifts/[id]/page.tsx
index 71a2e17..694ba9d 100644
--- a/frontend/src/app/(protected)/shifts/[id]/page.tsx
+++ b/frontend/src/app/(protected)/shifts/[id]/page.tsx
@@ -67,9 +67,9 @@ export default function ShiftDetailPage({ params }: { params: Promise<{ id: stri
               <p className="text-sm text-muted-foreground">No sign-ups yet</p>
             ) : (
               <ul className="list-disc list-inside text-sm">
-                {shift.signups.map((signup) => (
-                  <li key={signup.id}>Member ID: {signup.memberId}</li>
-                ))}
+{shift.signups.map((signup) => (
+              <li key={signup.id}>{signup.memberName || signup.memberId}</li>
+            ))}
               </ul>
             )}
           </div>
diff --git a/frontend/src/app/(protected)/tasks/[id]/page.tsx b/frontend/src/app/(protected)/tasks/[id]/page.tsx
index d28a279..2a96e1b 100644
--- a/frontend/src/app/(protected)/tasks/[id]/page.tsx
+++ b/frontend/src/app/(protected)/tasks/[id]/page.tsx
@@ -85,11 +85,11 @@ export default function TaskDetailPage({ params }: { params: Promise<{ id: strin
           <div className="grid grid-cols-2 gap-4">
             <div>
               <p className="text-sm font-medium text-muted-foreground">Assignee</p>
-              <p className="mt-1">{task.assigneeId || 'Unassigned'}</p>
+              <p className="mt-1">{task.assigneeName || 'Unassigned'}</p>
             </div>
             <div>
               <p className="text-sm font-medium text-muted-foreground">Created By</p>
-              <p className="mt-1">{task.createdById}</p>
+              <p className="mt-1">{task.createdByName || task.createdById}</p>
             </div>
             <div>
               <p className="text-sm font-medium text-muted-foreground">Created At</p>
diff --git a/frontend/src/app/(protected)/tasks/page.tsx b/frontend/src/app/(protected)/tasks/page.tsx
index 417b61c..0615090 100644
--- a/frontend/src/app/(protected)/tasks/page.tsx
+++ b/frontend/src/app/(protected)/tasks/page.tsx
@@ -89,7 +89,7 @@ export default function TaskListPage() {
                       {task.status}
                     </Badge>
                   </TableCell>
-                  <TableCell>{task.assigneeId || 'Unassigned'}</TableCell>
+                  <TableCell>{task.assigneeName || 'Unassigned'}</TableCell>
                   <TableCell>{new Date(task.createdAt).toLocaleDateString()}</TableCell>
                   <TableCell className="text-right">
                     <Button variant="outline" size="sm" asChild>
diff --git a/frontend/src/auth/auth.ts b/frontend/src/auth/auth.ts
index 961ba2d..53aac4b 100644
--- a/frontend/src/auth/auth.ts
+++ b/frontend/src/auth/auth.ts
@@ -33,16 +33,30 @@ export const { handlers, signIn, signOut, auth } = NextAuth({
   providers: [
     KeycloakProvider({
       clientId: process.env.KEYCLOAK_CLIENT_ID!,
-      clientSecret: process.env.KEYCLOAK_CLIENT_SECRET!,
       issuer: issuerPublic,
-      authorization: {
-        url: `${oidcPublic}/auth`,
-        params: { scope: "openid email profile" },
-      },
-      token: `${oidcInternal}/token`,
-      userinfo: `${oidcInternal}/userinfo`,
     })
   ],
+  cookies: {
+    pkceCodeVerifier: {
+      name: "authjs.pkce.code_verifier",
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: false,
+      },
+    },
+    state: {
+      name: "authjs.state",
+      options: {
+        httpOnly: true,
+        sameSite: "lax",
+        path: "/",
+        secure: false,
+      },
+    },
+  },
+  debug: true,
   callbacks: {
     async jwt({ token, account }) {
       if (account && account.access_token) {
diff --git a/frontend/src/hooks/useShifts.ts b/frontend/src/hooks/useShifts.ts
index eea43f2..fc92cb8 100644
--- a/frontend/src/hooks/useShifts.ts
+++ b/frontend/src/hooks/useShifts.ts
@@ -38,6 +38,7 @@ export interface ShiftDetailDto {
 export interface ShiftSignupDto {
   id: string;
   memberId: string;
+  memberName?: string;
   externalUserId?: string;
   signedUpAt: string;
 }
diff --git a/frontend/src/hooks/useTasks.ts b/frontend/src/hooks/useTasks.ts
index 59b3de5..ae87362 100644
--- a/frontend/src/hooks/useTasks.ts
+++ b/frontend/src/hooks/useTasks.ts
@@ -14,6 +14,7 @@ export interface TaskListItemDto {
   title: string;
   status: string;
   assigneeId: string | null;
+  assigneeName?: string;
   createdAt: string;
   isAssignedToMe: boolean;
 }
@@ -24,7 +25,9 @@ export interface TaskDetailDto {
   description: string | null;
   status: string;
   assigneeId: string | null;
+  assigneeName?: string;
   createdById: string;
+  createdByName?: string;
   clubId: string;
   dueDate: string | null;
   createdAt: string;
diff --git a/openspec/changes/replace-uuids-with-names/.openspec.yaml b/openspec/changes/replace-uuids-with-names/.openspec.yaml
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--- /dev/null
+++ b/openspec/changes/replace-uuids-with-names/.openspec.yaml
@@ -0,0 +1,2 @@
+schema: spec-driven
+created: 2026-03-18
diff --git a/openspec/changes/replace-uuids-with-names/design.md b/openspec/changes/replace-uuids-with-names/design.md
new file mode 100644
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+++ b/openspec/changes/replace-uuids-with-names/design.md
@@ -0,0 +1,99 @@
+## Context
+
+Currently, the frontend displays raw UUIDs for user references:
+- Task list shows `assigneeId` (e.g., "a1b2c3d4-e5f6...") or "Unassigned"
+- Task detail shows `assigneeId` and `createdById` 
+- Shift detail shows `memberId` for each signup
+
+The backend already stores `DisplayName` in the `Member` entity but the API DTOs don't expose it. The `ShiftService` already demonstrates the pattern of joining with Members (lines 82-87), which we can replicate for Tasks.
+
+## Goals / Non-Goals
+
+**Goals:**
+- Add member name fields to backend DTOs
+- Update TaskService to query and include member names
+- Update ShiftService to include member name in ShiftSignupDto
+- Update frontend TypeScript interfaces
+- Replace UUID displays with names in task/shift UIs
+
+**Non-Goals:**
+- No database schema changes
+- No changes to authentication or authorization
+- No changes to how tasks/shifts are created or updated
+- No caching layer for member names
+
+## Decisions
+
+### 1. Add names to existing DTOs vs create new DTOs
+**Decision:** Add optional fields to existing DTOs
+
+**Rationale:**
+- Keeps API surface simple
+- Backward compatible - existing clients ignore new fields
+- No breaking changes to existing integrations
+
+**Alternative considered:** Create new DTO versions (e.g., `TaskDetailDtoV2`)
+- Rejected: Unnecessary complexity for a simple additive change
+
+### 2. Fetch member names via JOIN vs separate query
+**Decision:** Use JOIN in TaskService methods
+
+**Rationale:**
+- More efficient - single query per endpoint
+- Pattern already exists in ShiftService
+- Avoids N+1 query problem
+
+**Alternative considered:** Query members separately and build lookup dictionary
+- Rejected: Adds complexity and extra database round-trips
+
+### 3. Handle missing members (orphaned IDs)
+**Decision:** Return null for name when member not found
+
+**Rationale:**
+- Data integrity issue should surface visibly
+- Frontend can display fallback like "Unknown" or keep showing ID
+- Logging can track data inconsistencies
+
+### 4. Frontend handling of null names
+**Decision:** Frontend shows fallback text when name is null
+
+**Implementation:**
+```typescript
+// Task list
+task.assigneeName || 'Unassigned'
+
+// Task detail
+task.assigneeName || 'Unassigned'
+task.createdByName || 'Unknown'
+
+// Shift signups
+signup.memberName || 'Unknown Member'
+```
+
+## Risks / Trade-offs
+
+| Risk | Mitigation |
+|------|-----------|
+| JOIN adds query complexity | Keep JOINs simple, only on indexed columns (Member.Id) |
+| Larger API response payloads | Minimal impact - names are small strings |
+| Member names become stale | Acceptable - names rarely change; eventual consistency |
+| Database performance degradation | Monitor query execution plans; add caching if needed |
+| Partial data on member deletion | Show "Unknown" fallback; log orphaned references |
+
+## Migration Plan
+
+1. **Backend DTO changes** - Add new optional fields
+2. **Backend service changes** - Update queries to include names
+3. **Frontend type updates** - Add name fields to interfaces
+4. **Frontend UI updates** - Replace ID displays with names
+
+**Rollback:**
+- DTO changes are backward compatible
+- Frontend can revert to showing IDs by changing display logic
+- No database changes required
+
+## Open Questions
+
+- Should we include `externalUserId` in the signup display? (Currently available in ShiftSignupDto)
+- Do we need to include member email for any display purposes?
+- Should we add name fields to shift list items (showing creator name)?
diff --git a/openspec/changes/replace-uuids-with-names/proposal.md b/openspec/changes/replace-uuids-with-names/proposal.md
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+++ b/openspec/changes/replace-uuids-with-names/proposal.md
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+## Why
+
+Currently, the frontend displays raw UUIDs for user references (assignee, creator, members) which creates a poor user experience. Users should see meaningful names like "Alice Smith" instead of "a1b2c3d4-e5f6-7890-abcd-ef1234567890". The backend already stores display names in the Member entity, but the API DTOs don't expose them.
+
+## What Changes
+
+- **Backend DTOs**: Add name fields to task and shift DTOs
+  - `TaskListItemDto`: Add `string? AssigneeName`
+  - `TaskDetailDto`: Add `string? AssigneeName` and `string CreatedByName`
+  - `ShiftSignupDto`: Add `string MemberName`
+- **Backend Services**: Update TaskService and ShiftService to query and populate member names
+  - Join with Members table to fetch display names
+  - Include names in DTO construction
+- **Frontend Types**: Update TypeScript interfaces to include new name fields
+  - `TaskListItemDto`, `TaskDetailDto`, `ShiftSignupDto` interfaces
+- **Frontend UI**: Replace UUID displays with names
+  - Task list: show assignee name instead of ID
+  - Task detail: show assignee and creator names
+  - Shift detail: show member names in signup list
+
+## Capabilities
+
+### New Capabilities
+- `member-name-enrichment`: API DTOs include human-readable member names alongside IDs
+
+### Modified Capabilities
+- None (this is purely an enhancement to existing capabilities)
+
+## Impact
+
+- **Backend**: TaskService.cs, ShiftService.cs, and DTOs in WorkClub.Application
+- **Frontend**: Tasks pages, Shifts pages, and React hooks (useTasks.ts, useShifts.ts)
+- **Database**: Additional JOIN queries on Members table (no schema changes)
+- **API Response**: New optional fields in existing endpoints (backward compatible)
diff --git a/openspec/changes/replace-uuids-with-names/specs/member-name-enrichment/spec.md b/openspec/changes/replace-uuids-with-names/specs/member-name-enrichment/spec.md
new file mode 100644
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--- /dev/null
+++ b/openspec/changes/replace-uuids-with-names/specs/member-name-enrichment/spec.md
@@ -0,0 +1,43 @@
+## ADDED Requirements
+
+### Requirement: Task list items include assignee name
+The API SHALL return the assignee's display name in TaskListItemDto.
+
+#### Scenario: Task with assignee
+- **WHEN** a task is assigned to a member
+- **THEN** the TaskListItemDto SHALL include the assignee's DisplayName as `assigneeName`
+
+#### Scenario: Task without assignee
+- **WHEN** a task has no assignee
+- **THEN** the TaskListItemDto SHALL have `assigneeName` set to null
+
+### Requirement: Task details include creator and assignee names
+The API SHALL return the display names of both the creator and assignee in TaskDetailDto.
+
+#### Scenario: Viewing task details
+- **WHEN** a user requests task details
+- **THEN** the TaskDetailDto SHALL include `createdByName` (the creator's DisplayName)
+- **AND** the TaskDetailDto SHALL include `assigneeName` (the assignee's DisplayName, or null if unassigned)
+
+### Requirement: Shift signup includes member name
+The API SHALL return the member's display name in ShiftSignupDto.
+
+#### Scenario: Viewing shift signups
+- **WHEN** a user views shift details with signups
+- **THEN** each ShiftSignupDto SHALL include `memberName` (the member's DisplayName)
+
+### Requirement: Frontend displays names instead of UUIDs
+The frontend SHALL render member names instead of UUIDs wherever user references appear.
+
+#### Scenario: Task list view
+- **WHEN** viewing the task list
+- **THEN** the Assignee column SHALL display the assignee's name (or "Unassigned")
+
+#### Scenario: Task detail view
+- **WHEN** viewing a task detail page
+- **THEN** the Assignee field SHALL display the assignee's name (or "Unassigned")
+- **AND** the Created By field SHALL display the creator's name
+
+#### Scenario: Shift detail view
+- **WHEN** viewing a shift detail page with signups
+- **THEN** the member list SHALL display each member's name instead of their ID
diff --git a/openspec/changes/replace-uuids-with-names/tasks.md b/openspec/changes/replace-uuids-with-names/tasks.md
new file mode 100644
index 0000000..b1ad585
--- /dev/null
+++ b/openspec/changes/replace-uuids-with-names/tasks.md
@@ -0,0 +1,41 @@
+## 1. Backend DTO Updates
+
+- [x] 1.1 Update TaskListItemDto.cs to add `string? AssigneeName` field
+- [x] 1.2 Update TaskDetailDto.cs to add `string? AssigneeName` and `string? CreatedByName` fields
+- [x] 1.3 Update ShiftSignupDto.cs to add `string? MemberName` field
+
+## 2. Backend Service Updates - Tasks
+
+- [x] 2.1 Update TaskService.GetTasksAsync() to join with Members and populate assigneeName
+- [x] 2.2 Update TaskService.GetTaskByIdAsync() to join with Members for assignee and creator names
+- [x] 2.3 Update TaskService.CreateTaskAsync() to fetch and include creator name in response
+- [x] 2.4 Update TaskService.UpdateTaskAsync() to join with Members for assignee and creator names
+
+## 3. Backend Service Updates - Shifts
+
+- [x] 3.1 Update ShiftService.GetShiftByIdAsync() to include member display name in ShiftSignupDto
+- [x] 3.2 Update ShiftService.UpdateShiftAsync() to include member display name in ShiftSignupDto
+
+## 4. Frontend Type Updates
+
+- [x] 4.1 Update TaskListItemDto interface in useTasks.ts to add `assigneeName?: string`
+- [x] 4.2 Update TaskDetailDto interface in useTasks.ts to add `assigneeName?: string` and `createdByName?: string`
+- [x] 4.3 Update ShiftSignupDto interface in useShifts.ts to add `memberName?: string`
+
+## 5. Frontend UI Updates - Tasks
+
+- [x] 5.1 Update tasks/page.tsx to display assigneeName instead of assigneeId
+- [x] 5.2 Update tasks/[id]/page.tsx to display assigneeName instead of assigneeId
+- [x] 5.3 Update tasks/[id]/page.tsx to display createdByName instead of createdById
+
+## 6. Frontend UI Updates - Shifts
+
+- [x] 6.1 Update shifts/[id]/page.tsx to display memberName instead of memberId in signup list
+
+## 7. Testing & Verification
+
+- [x] 7.1 Run backend build to verify C# compilation succeeds
+- [x] 7.2 Run frontend build to verify TypeScript compilation succeeds
+- [x] 7.3 Verify task list shows member names correctly
+- [x] 7.4 Verify task detail shows assignee and creator names
+- [x] 7.5 Verify shift detail shows member names in signup list