The implementation is complete. Here's a summary of the changes made: (#1871)

## Summary

I've implemented the GitHub PR status display on `WorkspaceSummary.tsx`. The changes include:

### Backend Changes

1. **`crates/db/src/models/merge.rs`** - Added a new method `get_latest_pr_status_for_workspaces()` that efficiently queries the latest PR status for all workspaces grouped by archived status.

2. **`crates/server/src/routes/task_attempts/workspace_summary.rs`** - Added `pr_status: Option<MergeStatus>` field to the `WorkspaceSummary` struct and included the PR status query in the summary endpoint.

### Frontend Changes

3. **`frontend/src/components/ui-new/hooks/useWorkspaces.ts`** - Added `prStatus` to the `SidebarWorkspace` interface and mapped it in `toSidebarWorkspace()`.

4. **`frontend/src/components/ui-new/primitives/WorkspaceSummary.tsx`** - Added:
   - Import for `GitPullRequestIcon`
   - `prStatus` prop to the component
   - Display logic showing:
     - **PR open**: `GitPullRequestIcon` with `text-brand` (orange) color
     - **PR merged**: `GitPullRequestIcon` with `text-success` (green) color
     - **No PR/closed/unknown**: No icon displayed

5. **`frontend/src/components/ui-new/views/WorkspacesSidebar.tsx`** - Passed the `prStatus` prop to both active and archived workspace summaries.

### Generated Types

6. **`shared/types.ts`** - Auto-generated to include the new `pr_status` field in `WorkspaceSummary`.

crates/db/src/models/merge.rs

@@ -1,3 +1,5 @@
+use std::collections::HashMap;
+
 use chrono::{DateTime, Utc};
 use serde::{Deserialize, Serialize};
 use sqlx::{FromRow, SqlitePool, Type};
@@ -288,6 +290,45 @@ impl Merge {
 
         Ok(rows.into_iter().map(Into::into).collect())
     }
+
+    /// Get the latest PR status for each workspace (for workspace summaries)
+    /// Returns a map of workspace_id -> MergeStatus for workspaces that have PRs
+    pub async fn get_latest_pr_status_for_workspaces(
+        pool: &SqlitePool,
+        archived: bool,
+    ) -> Result<HashMap<Uuid, MergeStatus>, sqlx::Error> {
+        #[derive(FromRow)]
+        struct PrStatusRow {
+            workspace_id: Uuid,
+            pr_status: Option<MergeStatus>,
+        }
+
+        // Get the latest PR for each workspace by using a subquery to find the max created_at
+        // Only consider PR merges (not direct merges)
+        let rows = sqlx::query_as::<_, PrStatusRow>(
+            r#"SELECT
+                m.workspace_id,
+                m.pr_status
+            FROM merges m
+            INNER JOIN (
+                SELECT workspace_id, MAX(created_at) as max_created_at
+                FROM merges
+                WHERE merge_type = 'pr'
+                GROUP BY workspace_id
+            ) latest ON m.workspace_id = latest.workspace_id
+                AND m.created_at = latest.max_created_at
+            INNER JOIN workspaces w ON m.workspace_id = w.id
+            WHERE m.merge_type = 'pr' AND w.archived = $1"#,
+        )
+        .bind(archived)
+        .fetch_all(pool)
+        .await?;
+
+        Ok(rows
+            .into_iter()
+            .filter_map(|row| row.pr_status.map(|status| (row.workspace_id, status)))
+            .collect())
+    }
 }
 
 // Conversion implementations

crates/server/src/routes/task_attempts/workspace_summary.rs

@@ -4,6 +4,7 @@ use axum::{Json, extract::State, response::Json as ResponseJson};
 use db::models::{
     coding_agent_turn::CodingAgentTurn,
     execution_process::{ExecutionProcess, ExecutionProcessStatus},
+    merge::{Merge, MergeStatus},
     workspace::Workspace,
     workspace_repo::WorkspaceRepo,
 };
@@ -45,6 +46,8 @@ pub struct WorkspaceSummary {
     pub has_running_dev_server: bool,
     /// Does this workspace have unseen coding agent turns?
     pub has_unseen_turns: bool,
+    /// PR status for this workspace (if any PR exists)
+    pub pr_status: Option<MergeStatus>,
 }
 
 /// Response containing summaries for requested workspaces
@@ -103,7 +106,10 @@ pub async fn get_workspace_summaries(
     // 5. Check which workspaces have unseen coding agent turns
     let unseen_workspaces = CodingAgentTurn::find_workspaces_with_unseen(pool, archived).await?;
 
-    // 6. Compute diff stats for each workspace (in parallel)
+    // 6. Get PR status for each workspace
+    let pr_statuses = Merge::get_latest_pr_status_for_workspaces(pool, archived).await?;
+
+    // 7. Compute diff stats for each workspace (in parallel)
     let diff_futures: Vec<_> = workspaces
         .iter()
         .map(|ws| {
@@ -126,7 +132,7 @@ pub async fn get_workspace_summaries(
         futures_util::future::join_all(diff_futures).await;
     let diff_stats: HashMap<Uuid, DiffStats> = diff_results.into_iter().flatten().collect();
 
-    // 7. Assemble response
+    // 8. Assemble response
     let summaries: Vec<WorkspaceSummary> = workspaces
         .iter()
         .map(|ws| {
@@ -148,6 +154,7 @@ pub async fn get_workspace_summaries(
                 latest_process_status: latest.map(|p| p.status.clone()),
                 has_running_dev_server: dev_server_workspaces.contains(&id),
                 has_unseen_turns: unseen_workspaces.contains(&id),
+                pr_status: pr_statuses.get(&id).cloned(),
             }
         })
         .collect();

frontend/src/components/ui-new/hooks/useWorkspaces.ts

@@ -25,6 +25,7 @@ export interface SidebarWorkspace {
   hasUnseenActivity?: boolean;
   latestProcessCompletedAt?: string;
   latestProcessStatus?: 'running' | 'completed' | 'failed' | 'killed';
+  prStatus?: 'open' | 'merged' | 'closed' | 'unknown';
 }
 
 // Keep the old export name for backwards compatibility
@@ -67,6 +68,7 @@ function toSidebarWorkspace(
     hasUnseenActivity: summary?.has_unseen_turns,
     latestProcessCompletedAt: summary?.latest_process_completed_at ?? undefined,
     latestProcessStatus: summary?.latest_process_status ?? undefined,
+    prStatus: summary?.pr_status ?? undefined,
   };
 }
 

frontend/src/components/ui-new/primitives/WorkspaceSummary.tsx

@@ -6,6 +6,7 @@ import {
   PlayIcon,
   FileIcon,
   CircleIcon,
+  GitPullRequestIcon,
 } from '@phosphor-icons/react';
 import { useTranslation } from 'react-i18next';
 import { cn } from '@/lib/utils';
@@ -27,6 +28,7 @@ interface WorkspaceSummaryProps {
   hasUnseenActivity?: boolean;
   latestProcessCompletedAt?: string;
   latestProcessStatus?: 'running' | 'completed' | 'failed' | 'killed';
+  prStatus?: 'open' | 'merged' | 'closed' | 'unknown';
   onClick?: () => void;
   className?: string;
   summary?: boolean;
@@ -48,6 +50,7 @@ export function WorkspaceSummary({
   hasUnseenActivity = false,
   latestProcessCompletedAt,
   latestProcessStatus,
+  prStatus,
   onClick,
   className,
   summary = false,
@@ -120,6 +123,20 @@ export function WorkspaceSummary({
               />
             )}
 
+            {/* PR status icon */}
+            {prStatus === 'open' && (
+              <GitPullRequestIcon
+                className="size-icon-xs text-brand shrink-0"
+                weight="fill"
+              />
+            )}
+            {prStatus === 'merged' && (
+              <GitPullRequestIcon
+                className="size-icon-xs text-success shrink-0"
+                weight="fill"
+              />
+            )}
+
             {/* Pin icon */}
             {isPinned && (
               <PushPinIcon

frontend/src/components/ui-new/views/WorkspacesSidebar.tsx

@@ -97,6 +97,7 @@ export function WorkspacesSidebar({
               hasUnseenActivity={workspace.hasUnseenActivity}
               latestProcessCompletedAt={workspace.latestProcessCompletedAt}
               latestProcessStatus={workspace.latestProcessStatus}
+              prStatus={workspace.prStatus}
               onClick={() => onSelectWorkspace(workspace.id)}
             />
           ))}
@@ -124,6 +125,7 @@ export function WorkspacesSidebar({
               hasUnseenActivity={workspace.hasUnseenActivity}
               latestProcessCompletedAt={workspace.latestProcessCompletedAt}
               latestProcessStatus={workspace.latestProcessStatus}
+              prStatus={workspace.prStatus}
               onClick={() => onSelectWorkspace(workspace.id)}
             />
           ))}

shared/types.ts

@@ -352,7 +352,11 @@ has_running_dev_server: boolean,
 /**
  * Does this workspace have unseen coding agent turns?
  */
-has_unseen_turns: boolean, };
+has_unseen_turns: boolean, 
+/**
+ * PR status for this workspace (if any PR exists)
+ */
+pr_status: MergeStatus | null, };
 
 export type WorkspaceSummaryResponse = { summaries: Array<WorkspaceSummary>, };