feat(jobs): add host_names to job list API and UI (#24)

* feat(jobs): add host_names to job list API and UI

Closes #23

* fix(jobs): add mut for host_names merge loop

crates/pm-core/src/models.rs

@@ -505,6 +505,10 @@ pub struct PatchJobSummary {
     pub status: JobStatus,
     pub immediate: bool,
     pub host_count: i64,
+    /// Display names of hosts targeted by this job (falls back to fqdn).
+    #[serde(default)]
+    #[sqlx(skip)]
+    pub host_names: Vec<String>,
     pub succeeded_count: i64,
     pub failed_count: i64,
     pub notes: String,

crates/pm-web/src/routes/jobs.rs

@@ -20,6 +20,7 @@ use pm_core::{
 };
 use serde::{Deserialize, Serialize};
 use serde_json::{json, Value};
+use std::collections::HashMap;
 use uuid::Uuid;
 
 use crate::AppState;
@@ -52,6 +53,13 @@ struct JobListResponse {
     offset: i64,
 }
 
+/// Helper struct for the host_names aggregation query.
+#[derive(Debug, sqlx::FromRow)]
+struct JobHostNames {
+    id: Uuid,
+    host_names: Vec<String>,
+}
+
 /// Per-host row included in `GET /api/v1/jobs/{id}` response.
 #[derive(Debug, Clone, Serialize, sqlx::FromRow)]
 struct JobHostRow {
@@ -229,7 +237,7 @@ async fn list_jobs(
     let limit = q.limit.unwrap_or(50).min(200);
     let offset = q.offset.unwrap_or(0);
 
-    let jobs: Vec<PatchJobSummary> = if auth.role.is_admin() {
+    let mut jobs: Vec<PatchJobSummary> = if auth.role.is_admin() {
         // Admins see every job.
         sqlx::query_as(
             r#"
@@ -298,6 +306,40 @@ async fn list_jobs(
         err(StatusCode::INTERNAL_SERVER_ERROR, "internal_error", "Database error")
     })?;
 
+    // Fetch host names for all jobs in this page.
+    let job_ids: Vec<Uuid> = jobs.iter().map(|j| j.id).collect();
+    let host_names_rows: Vec<JobHostNames> = if job_ids.is_empty() {
+        Vec::new()
+    } else {
+        sqlx::query_as(
+            r#"
+            SELECT pjh.job_id AS id,
+                   array_agg(COALESCE(NULLIF(h.display_name, ''), h.fqdn)
+                             ORDER BY h.fqdn) AS host_names
+            FROM patch_job_hosts pjh
+            JOIN hosts h ON h.id = pjh.host_id
+            WHERE pjh.job_id = ANY($1)
+            GROUP BY pjh.job_id
+            "#,
+        )
+        .bind(&job_ids)
+        .fetch_all(&state.db)
+        .await
+        .unwrap_or_else(|e| {
+            tracing::warn!(error = %e, "list_jobs: host_names query failed, using empty defaults");
+            Vec::new()
+        })
+    };
+
+    // Merge host_names into summaries.
+    let mut host_names_map: HashMap<Uuid, Vec<String>> = host_names_rows
+        .into_iter()
+        .map(|r| (r.id, r.host_names))
+        .collect();
+    for job in &mut jobs {
+        job.host_names = host_names_map.remove(&job.id).unwrap_or_default();
+    }
+
     // Total count for pagination metadata.
     let total: i64 = if auth.role.is_admin() {
         sqlx::query_scalar("SELECT COUNT(*) FROM patch_jobs")

docs/REST_API.md

@@ -70,12 +70,16 @@ Security: JWT Bearer Token (except Public Endpoints)
 ## 7. Jobs & Patch Deployment
 | Method | Endpoint | Description |
 |--------|----------|-------------|
-| GET | `/jobs` | List patch jobs |
+| GET | `/jobs` | List patch jobs (includes `host_names` per job) |
 | POST | `/jobs` | Create new patch job |
 | GET | `/jobs/{id}` | Get job status/details |
 | POST | `/jobs/{id}/cancel` | Cancel running job |
 | POST | `/jobs/{id}/rollback` | Rollback completed job |
 
+### GET /jobs Response Fields
+Each job summary object includes:
+- `host_names`: Array of display names for hosts targeted by this job. Falls back to `fqdn` when `display_name` is empty. Single-host jobs show one name; multi-host jobs show all names sorted alphabetically.
+
 ## 8. Maintenance Windows
 *Scoped to host.*
 | Method | Endpoint | Description |

frontend/src/pages/JobsPage.tsx

@@ -194,7 +194,13 @@ function JobRow({
         <TableCell>
           <StatusChip status={job.status} />
         </TableCell>
-        <TableCell align="right">{job.host_count}</TableCell>
+        <TableCell>
+          {job.host_names.length === 1
+            ? job.host_names[0]
+            : job.host_names.length > 1
+              ? <Tooltip title={job.host_names.join(', ')}><span>{job.host_names[0]} +{job.host_names.length - 1}</span></Tooltip>
+              : '—'}
+        </TableCell>
         <TableCell align="right">
           <Typography color="success.main" fontWeight={600}>
             {job.succeeded_count}
@@ -512,7 +518,7 @@ export default function JobsPage() {
                 <TableCell>Created</TableCell>
                 <TableCell>Kind</TableCell>
                 <TableCell>Status</TableCell>
-                <TableCell align="right">Hosts</TableCell>
+                <TableCell>Hosts</TableCell>
                 <TableCell align="right">Succeeded</TableCell>
                 <TableCell align="right">Failed</TableCell>
                 <TableCell>Schedule</TableCell>

frontend/src/types/index.ts

@@ -144,6 +144,7 @@ export interface PatchJobSummary {
   status: JobStatus
   immediate: boolean
   host_count: number
+  host_names: string[]
   succeeded_count: number
   failed_count: number
   notes: string