build-logs: surface runtime_secs in header; show duration in dashboard row

frontend/packages/dashboard/src/tabs.js

@@ -1126,10 +1126,19 @@ window.marked = marked;
               : 'running';
             const age = h.started_at
               ? fmtAgeSecs(nowUnix - h.started_at) + ' ago' : '?';
+            const runtimeSpan = h.runtime_secs != null
+              ? el('span', { class: 'build-logs-runtime meta' }, fmtDuration(h.runtime_secs))
+              : h.started_at && !h.finished_at
+                ? el('span', {
+                    class: 'build-logs-runtime meta',
+                    'data-bl-elapsed': String(h.started_at),
+                  }, fmtElapsed(Math.max(0, nowUnix - h.started_at)))
+                : null;
             const rowBtn = el('button',
               { type: 'button', class: 'build-logs-row-btn', 'aria-expanded': 'false' },
               el('span', { class: `badge ${statusCls}` }, statusLabel),
               el('span', { class: 'build-logs-kind' }, h.kind),
+              runtimeSpan,
               el('span', { class: 'build-logs-age meta' }, age),
               el('span', { class: 'build-logs-cmdline meta' }, h.cmdline),
             );
@@ -2192,6 +2201,12 @@ window.marked = marked;
       const elapsed = Math.max(0, Math.floor(Date.now() / 1000 - started));
       span.textContent = '· ' + fmtElapsed(elapsed);
     }
+    for (const span of document.querySelectorAll('.build-logs-runtime[data-bl-elapsed]')) {
+      const started = parseInt(span.dataset.blElapsed, 10);
+      if (!started) continue;
+      const elapsed = Math.max(0, Math.floor(Date.now() / 1000 - started));
+      span.textContent = fmtElapsed(elapsed);
+    }
   }, 1000);
 
   // ─── reminders ──────────────────────────────────────────────────────────

hive-c0re/src/build_logs.rs

@@ -96,6 +96,9 @@ pub struct BuildLogHeader {
     pub started_at: i64,
     pub finished_at: Option<i64>,
     pub status: Option<String>,
+    /// Elapsed seconds from `started_at` to `finished_at`. `None` while
+    /// the build is still in progress.
+    pub runtime_secs: Option<i64>,
 }
 
 /// Full row with stdout/stderr text inlined. Returned by `get_full`,
@@ -328,15 +331,19 @@ impl BuildLogs {
         )?;
         let row = stmt
             .query_row(params![id], |r| {
+                let started_at: i64 = r.get(4)?;
+                let finished_at: Option<i64> = r.get(5)?;
+                let runtime_secs = finished_at.map(|f| f - started_at);
                 Ok(BuildLogFull {
                     header: BuildLogHeader {
                         id: r.get(0)?,
                         agent: r.get(1)?,
                         kind: r.get(2)?,
                         cmdline: r.get(3)?,
-                        started_at: r.get(4)?,
-                        finished_at: r.get(5)?,
+                        started_at,
+                        finished_at,
                         status: r.get(6)?,
+                        runtime_secs,
                     },
                     stdout: r.get(7)?,
                     stderr: r.get(8)?,
@@ -404,14 +411,18 @@ pub fn spawn_vacuum(coord: &Arc<crate::coordinator::Coordinator>) {
 }
 
 fn row_to_header(r: &rusqlite::Row) -> rusqlite::Result<BuildLogHeader> {
+    let started_at: i64 = r.get(4)?;
+    let finished_at: Option<i64> = r.get(5)?;
+    let runtime_secs = finished_at.map(|f| f - started_at);
     Ok(BuildLogHeader {
         id: r.get(0)?,
         agent: r.get(1)?,
         kind: r.get(2)?,
         cmdline: r.get(3)?,
-        started_at: r.get(4)?,
-        finished_at: r.get(5)?,
+        started_at,
+        finished_at,
         status: r.get(6)?,
+        runtime_secs,
     })
 }