diff --git a/src/gitea_codex_bot/main.py b/src/gitea_codex_bot/main.py
index 070598e..6fd7dc7 100644
--- a/src/gitea_codex_bot/main.py
+++ b/src/gitea_codex_bot/main.py
@@ -11,10 +11,12 @@ from fastapi import Depends, FastAPI, Header, HTTPException, Request, status
 from fastapi.exception_handlers import http_exception_handler
 from fastapi.responses import HTMLResponse
 from starlette.exceptions import HTTPException as StarletteHTTPException
+from sqlalchemy import select
 from sqlalchemy.orm import Session
 
 from gitea_codex_bot.config import Settings, get_settings
 from gitea_codex_bot.db import get_session
+from gitea_codex_bot.models import JobStatus, ReviewJob
 from gitea_codex_bot.services.commands import parse_command
 from gitea_codex_bot.services.gitea import GiteaClient
 from gitea_codex_bot.services.jobs import cooldown_remaining_seconds, enqueue_job, persist_webhook_event
@@ -147,6 +149,13 @@ def _load_repo_review_config_for_pr(gitea: GiteaClient, repo: str, pr_number: in
     return parse_repo_review_config_text(cfg_text, configured=True), head_sha
 
 
+def _resolve_pr_head_sha(gitea: GiteaClient, repo: str, pr_number: int, fallback: str) -> str:
+    try:
+        return gitea.get_pull_request(repo, pr_number).head_sha
+    except Exception:
+        return fallback
+
+
 def _render_landing_page() -> str:
     return """<!doctype html>
 <html lang="en">
@@ -164,6 +173,8 @@ def _render_landing_page() -> str:
         <p class="mt-4 text-base leading-7 text-slate-300">This endpoint powers automated pull request review workflows for Gitea. It validates signed webhook events, queues review jobs, and posts structured feedback back to pull requests.</p>
         <div class="mt-8 flex flex-wrap gap-3 text-sm">
           <button id="health-button" type="button" class="rounded-lg border border-slate-700 bg-slate-800/80 px-3 py-2 text-slate-200 transition hover:border-slate-500 hover:bg-slate-700">Health: <code>/healthz</code></button>
+          <button id="failure-button" type="button" class="rounded-lg border border-amber-500/40 bg-amber-500/10 px-3 py-2 text-amber-200 transition hover:border-amber-400 hover:bg-amber-500/20">Latest failure: <code>/healthz/latest-failure</code></button>
+          <button id="job-button" type="button" class="rounded-lg border border-cyan-500/40 bg-cyan-500/10 px-3 py-2 text-cyan-200 transition hover:border-cyan-400 hover:bg-cyan-500/20">Latest job: <code>/healthz/latest-job</code></button>
           <span class="rounded-lg border border-slate-700 bg-slate-800/80 px-3 py-2 text-slate-200">Webhook: <code>POST /webhook/gitea</code></span>
         </div>
       </section>
@@ -179,6 +190,8 @@ def _render_landing_page() -> str:
     </div>
     <script>
       const healthButton = document.getElementById("health-button");
+      const failureButton = document.getElementById("failure-button");
+      const jobButton = document.getElementById("job-button");
       const healthModal = document.getElementById("health-modal");
       const closeModal = document.getElementById("close-modal");
       const healthResult = document.getElementById("health-result");
@@ -196,6 +209,57 @@ def _render_landing_page() -> str:
         }
       }
 
+      async function loadLatestFailure() {
+        healthResult.textContent = "Loading...";
+        try {
+          const response = await fetch("/healthz/latest-failure", { headers: { Accept: "application/json" } });
+          const payload = await response.json();
+          if (!payload.has_failed_job) {
+            healthResult.textContent = "No failed jobs found.";
+            return;
+          }
+          const failedAt = payload.failed_at ? payload.failed_at : "unknown";
+          const errorText = payload.error ? payload.error : "unknown";
+          healthResult.textContent =
+            "Latest failed job #" + payload.job_id +
+            " | " + payload.repo + "#" + payload.pr_number +
+            " | command=" + payload.command +
+            " | commit=" + payload.head_sha.slice(0, 7) +
+            " | failed_at=" + failedAt +
+            " | error=" + errorText;
+        } catch (_error) {
+          healthResult.textContent = "Could not load latest failure output.";
+        }
+      }
+
+      async function loadLatestJob() {
+        healthResult.textContent = "Loading...";
+        try {
+          const response = await fetch("/healthz/latest-job", { headers: { Accept: "application/json" } });
+          const payload = await response.json();
+          if (!payload.has_job) {
+            healthResult.textContent = "No jobs found yet.";
+            return;
+          }
+          const startedAt = payload.started_at ? payload.started_at : "not started";
+          const finishedAt = payload.finished_at ? payload.finished_at : "not finished";
+          const errorText = payload.error ? payload.error : "none";
+          const summary = payload.result_summary ? payload.result_summary : "none";
+          healthResult.textContent =
+            "Latest job #" + payload.job_id +
+            " | " + payload.repo + "#" + payload.pr_number +
+            " | command=" + payload.command +
+            " | status=" + payload.job_status +
+            " | commit=" + payload.head_sha.slice(0, 7) +
+            " | started_at=" + startedAt +
+            " | finished_at=" + finishedAt +
+            " | error=" + errorText +
+            " | summary=" + summary;
+        } catch (_error) {
+          healthResult.textContent = "Could not load latest job output.";
+        }
+      }
+
       function showModal() {
         healthModal.classList.remove("hidden");
         healthModal.classList.add("flex");
@@ -210,6 +274,14 @@ def _render_landing_page() -> str:
         showModal();
         await loadHealth();
       });
+      failureButton.addEventListener("click", async function () {
+        showModal();
+        await loadLatestFailure();
+      });
+      jobButton.addEventListener("click", async function () {
+        showModal();
+        await loadLatestJob();
+      });
 
       closeModal.addEventListener("click", hideModal);
       healthModal.addEventListener("click", function (event) {
@@ -264,6 +336,54 @@ def healthz(settings: Settings = Depends(get_settings)) -> dict[str, str]:
     return {"status": "ok"}
 
 
+@app.get("/healthz/latest-failure")
+def healthz_latest_failure(session: Session = Depends(get_session)) -> dict[str, Any]:
+    failed_job = session.execute(
+        select(ReviewJob).where(ReviewJob.status == JobStatus.failed).order_by(ReviewJob.created_at.desc(), ReviewJob.id.desc()).limit(1)
+    ).scalar_one_or_none()
+    if not failed_job:
+        return {"status": "ok", "has_failed_job": False}
+    return {
+        "status": "ok",
+        "has_failed_job": True,
+        "job_id": failed_job.id,
+        "repo": failed_job.repo,
+        "pr_number": failed_job.pr_number,
+        "command": failed_job.command,
+        "head_sha": failed_job.head_sha,
+        "error": failed_job.last_error or "",
+        "failed_at": failed_job.finished_at.isoformat() if failed_job.finished_at else None,
+    }
+
+
+@app.get("/healthz/latest-job")
+def healthz_latest_job(session: Session = Depends(get_session)) -> dict[str, Any]:
+    latest_job = session.execute(select(ReviewJob).order_by(ReviewJob.created_at.desc(), ReviewJob.id.desc()).limit(1)).scalar_one_or_none()
+    if not latest_job:
+        return {"status": "ok", "has_job": False}
+
+    result_summary = ""
+    if isinstance(latest_job.result_json, dict):
+        summary = latest_job.result_json.get("summary")
+        if isinstance(summary, str):
+            result_summary = summary
+    return {
+        "status": "ok",
+        "has_job": True,
+        "job_id": latest_job.id,
+        "repo": latest_job.repo,
+        "pr_number": latest_job.pr_number,
+        "command": latest_job.command,
+        "head_sha": latest_job.head_sha,
+        "job_status": latest_job.status.value if hasattr(latest_job.status, "value") else str(latest_job.status),
+        "error": latest_job.last_error or "",
+        "result_summary": result_summary,
+        "created_at": latest_job.created_at.isoformat() if latest_job.created_at else None,
+        "started_at": latest_job.started_at.isoformat() if latest_job.started_at else None,
+        "finished_at": latest_job.finished_at.isoformat() if latest_job.finished_at else None,
+    }
+
+
 @app.post("/webhook/gitea")
 async def gitea_webhook(
     request: Request,
@@ -334,6 +454,7 @@ async def gitea_webhook(
 
     gitea = GiteaClient(settings)
     if parsed_command.name in {"review", "rerun"}:
+        head_sha = _resolve_pr_head_sha(gitea, repo, pr_number, head_sha)
         repo_cfg: RepoReviewConfig | None = None
         try:
             repo_cfg, resolved_head_sha = _load_repo_review_config_for_pr(gitea, repo, pr_number)
@@ -341,10 +462,7 @@ async def gitea_webhook(
         except Exception:
             repo_cfg = None
         if head_sha == "unknown":
-            try:
-                head_sha = gitea.get_pull_request(repo, pr_number).head_sha
-            except Exception:
-                pass
+            head_sha = _resolve_pr_head_sha(gitea, repo, pr_number, head_sha)
         if repo_cfg and not repo_cfg.enabled:
             gitea.post_issue_comment(repo, pr_number, format_disabled_ack())
             return {"accepted": True, "reason": "review disabled by repo config"}
diff --git a/src/gitea_codex_bot/services/gitea.py b/src/gitea_codex_bot/services/gitea.py
index 70d789c..b44bd24 100644
--- a/src/gitea_codex_bot/services/gitea.py
+++ b/src/gitea_codex_bot/services/gitea.py
@@ -90,6 +90,16 @@ class GiteaClient:
         )
         return int(payload["id"])
 
+    def get_issue_comment(self, repo: str, comment_id: int) -> dict[str, Any]:
+        owner, name = self.split_repo(repo)
+        encoded_owner = quote(owner, safe="")
+        encoded_name = quote(name, safe="")
+        payload = self._request(
+            "GET",
+            f"/api/v1/repos/{encoded_owner}/{encoded_name}/issues/comments/{comment_id}",
+        )
+        return dict(payload)
+
     def list_issue_comments(self, repo: str, pr_number: int) -> list[dict[str, Any]]:
         owner, name = self.split_repo(repo)
         encoded_owner = quote(owner, safe="")
diff --git a/src/gitea_codex_bot/services/jobs.py b/src/gitea_codex_bot/services/jobs.py
index 28f1e8a..488cda6 100644
--- a/src/gitea_codex_bot/services/jobs.py
+++ b/src/gitea_codex_bot/services/jobs.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 from datetime import datetime, timedelta, timezone
 
 from sqlalchemy import select
@@ -10,6 +11,8 @@ from gitea_codex_bot.models import JobStatus, ReviewJob, ReviewRun, RunStatus, W
 from gitea_codex_bot.services.security import payload_digest
 from gitea_codex_bot.types import ParsedCommand
 
+logger = logging.getLogger(__name__)
+
 
 def persist_webhook_event(
     session: Session,
@@ -79,6 +82,16 @@ def enqueue_job(
     session.add(job)
     session.commit()
     session.refresh(job)
+    logger.info(
+        "Job enqueued id=%s repo=%s pr=%s command=%s head_sha=%s trigger_comment_id=%s requested_by=%s",
+        job.id,
+        job.repo,
+        job.pr_number,
+        job.command,
+        job.head_sha,
+        job.trigger_comment_id,
+        job.requested_by,
+    )
     return job
 
 
@@ -95,6 +108,15 @@ def claim_next_job(session: Session) -> ReviewJob | None:
     session.add(run)
     session.commit()
     session.refresh(job)
+    logger.info(
+        "Job claimed id=%s repo=%s pr=%s command=%s head_sha=%s status=%s",
+        job.id,
+        job.repo,
+        job.pr_number,
+        job.command,
+        job.head_sha,
+        job.status.value if hasattr(job.status, "value") else job.status,
+    )
     return job
 
 
@@ -136,3 +158,13 @@ def finish_job(
         latest_run.error_message = error_message
 
     session.commit()
+    logger.info(
+        "Job finished id=%s repo=%s pr=%s status=%s run_status=%s skipped=%s error_present=%s",
+        job.id,
+        job.repo,
+        job.pr_number,
+        job.status.value if hasattr(job.status, "value") else job.status,
+        run_status.value if hasattr(run_status, "value") else run_status,
+        skipped,
+        bool(error_message),
+    )
diff --git a/src/gitea_codex_bot/workers/dispatcher.py b/src/gitea_codex_bot/workers/dispatcher.py
index 84b38f1..899ff9d 100644
--- a/src/gitea_codex_bot/workers/dispatcher.py
+++ b/src/gitea_codex_bot/workers/dispatcher.py
@@ -4,14 +4,13 @@ import asyncio
 import logging
 from typing import Any
 
-import httpx
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
 from gitea_codex_bot.config import Settings
 from gitea_codex_bot.db import get_session_factory
 from gitea_codex_bot.models import ReviewJob
-from gitea_codex_bot.services.comments import get_persistent_review_comment_id, upsert_persistent_review_comment_id
+from gitea_codex_bot.services.comments import upsert_persistent_review_comment_id
 from gitea_codex_bot.services.gitea import GiteaClient
 from gitea_codex_bot.services.jobs import claim_next_job, finish_job
 from gitea_codex_bot.services.review_format import format_disabled_ack, format_result_comment
@@ -75,6 +74,16 @@ def _handle_non_review_command(
     return False, False, None, None
 
 
+def _post_review_failure_comment(gitea: GiteaClient, job: ReviewJob, error_message: str) -> None:
+    message = (
+        "⚠️ Codex review run failed after queueing.\n\n"
+        f"- Commit: `{job.head_sha[:7]}`\n"
+        f"- Error: `{error_message[:500]}`\n\n"
+        "Please rerun `@codex rerun` after checking worker logs."
+    )
+    gitea.post_issue_comment(job.repo, job.pr_number, message)
+
+
 def process_one_job(settings: Settings) -> bool:
     session_factory = get_session_factory()
     with session_factory() as session:
@@ -84,11 +93,27 @@ def process_one_job(settings: Settings) -> bool:
 
     command = _command_from_job(job)
     gitea = GiteaClient(settings)
+    logger.info(
+        "Processing job id=%s repo=%s pr=%s command=%s args=%s head_sha=%s",
+        job.id,
+        job.repo,
+        job.pr_number,
+        command.name,
+        command.arguments,
+        job.head_sha,
+    )
 
     with session_factory() as session:
         db_job = session.execute(select(ReviewJob).where(ReviewJob.id == job.id)).scalar_one()
         handled, skipped, result, error = _handle_non_review_command(settings, session, gitea, db_job, command)
         if handled:
+            logger.info(
+                "Non-review command handled job id=%s command=%s skipped=%s error_present=%s",
+                db_job.id,
+                command.name,
+                skipped,
+                bool(error),
+            )
             finish_job(session, job_id=db_job.id, success=error is None, skipped=skipped, result=result, error_message=error)
             return True
 
@@ -108,6 +133,15 @@ def process_one_job(settings: Settings) -> bool:
                 )
                 return True
         result, repo_cfg = run_review_ephemeral(settings, repo=job.repo, pr_number=job.pr_number, command=command)
+        logger.info(
+            "Runner returned job id=%s repo=%s pr=%s repo_cfg_enabled=%s repo_cfg_configured=%s result_keys=%s",
+            job.id,
+            job.repo,
+            job.pr_number,
+            repo_cfg.enabled,
+            repo_cfg.configured,
+            sorted(result.keys()),
+        )
         if not repo_cfg.enabled:
             with session_factory() as session:
                 gitea.post_issue_comment(job.repo, job.pr_number, format_disabled_ack())
@@ -122,22 +156,14 @@ def process_one_job(settings: Settings) -> bool:
                 return True
         comment_body = format_result_comment(job.head_sha, result, repo_configured=repo_cfg.configured)
         with session_factory() as session:
-            comment_id = get_persistent_review_comment_id(session, job.repo, job.pr_number)
-            if comment_id:
-                try:
-                    gitea.edit_issue_comment(job.repo, comment_id, comment_body)
-                except httpx.HTTPStatusError as exc:
-                    if exc.response.status_code != 404:
-                        raise
-                    logger.warning(
-                        "Persistent review comment not found; posting a new one repo=%s pr=%s old_comment_id=%s",
-                        job.repo,
-                        job.pr_number,
-                        comment_id,
-                    )
-                    comment_id = gitea.post_issue_comment(job.repo, job.pr_number, comment_body)
-            else:
-                comment_id = gitea.post_issue_comment(job.repo, job.pr_number, comment_body)
+            comment_id = gitea.post_issue_comment(job.repo, job.pr_number, comment_body)
+            logger.info(
+                "Posted review comment job id=%s repo=%s pr=%s comment_id=%s",
+                job.id,
+                job.repo,
+                job.pr_number,
+                comment_id,
+            )
             upsert_persistent_review_comment_id(
                 session,
                 repo=job.repo,
@@ -145,11 +171,24 @@ def process_one_job(settings: Settings) -> bool:
                 head_sha=job.head_sha,
                 comment_id=comment_id,
             )
+            logger.info(
+                "Persistent comment mapping upserted job id=%s repo=%s pr=%s comment_id=%s head_sha=%s",
+                job.id,
+                job.repo,
+                job.pr_number,
+                comment_id,
+                job.head_sha,
+            )
             finish_job(session, job_id=job.id, success=True, skipped=False, result=result, error_message=None)
     except Exception as exc:
         logger.exception("Review job failed id=%s", job.id)
+        error_text = str(exc).strip() or exc.__class__.__name__
+        try:
+            _post_review_failure_comment(gitea, job, error_text)
+        except Exception:
+            logger.exception("Failed to post review failure comment id=%s", job.id)
         with session_factory() as session:
-            finish_job(session, job_id=job.id, success=False, skipped=False, result=None, error_message=str(exc))
+            finish_job(session, job_id=job.id, success=False, skipped=False, result=None, error_message=error_text)
     return True
 
 
diff --git a/tests/test_dispatcher.py b/tests/test_dispatcher.py
index ffa1ee2..57d2ffe 100644
--- a/tests/test_dispatcher.py
+++ b/tests/test_dispatcher.py
@@ -2,7 +2,6 @@ from __future__ import annotations
 
 from types import SimpleNamespace
 
-import httpx
 from sqlalchemy import select
 
 from gitea_codex_bot.config import get_settings
@@ -15,7 +14,8 @@ from gitea_codex_bot.types import ParsedCommand
 from gitea_codex_bot.workers.dispatcher import process_one_job
 
 
-def test_process_one_job_recreates_persistent_comment_when_edit_returns_404(monkeypatch) -> None:
+def test_process_one_job_always_posts_new_review_comment(monkeypatch) -> None:
+    posted_ids: list[int] = []
     session_factory = get_session_factory()
     with session_factory() as session:
         job = enqueue_job(
@@ -39,37 +39,27 @@ def test_process_one_job_recreates_persistent_comment_when_edit_returns_404(monk
     monkeypatch.setattr(
         "gitea_codex_bot.workers.dispatcher.run_review_ephemeral",
         lambda *_args, **_kwargs: (
-            {
-                "verdict": "has_issues",
-                "confidence": 0.7,
-                "summary": "runner error",
-                "findings": [],
-            },
+            {"verdict": "has_issues", "confidence": 0.7, "summary": "runner error", "findings": []},
             RepoReviewConfig(configured=True, enabled=True),
         ),
     )
 
     class _FakeGiteaClient:
         def __init__(self, _settings) -> None:
-            self.posted_comment_id = 0
+            pass
 
         def get_pull_request(self, _repo: str, _pr_number: int):
             return SimpleNamespace(is_fork=False)
 
-        def edit_issue_comment(self, _repo: str, _comment_id: int, _body: str) -> int:
-            request = httpx.Request("PATCH", "https://gitea.test/api/v1/repos/acme/repo/issues/comments/289")
-            response = httpx.Response(404, request=request, text='{"message":"not found"}')
-            raise httpx.HTTPStatusError("not found", request=request, response=response)
-
         def post_issue_comment(self, _repo: str, _pr_number: int, _body: str) -> int:
-            self.posted_comment_id = 990
-            return self.posted_comment_id
+            new_id = 990
+            posted_ids.append(new_id)
+            return new_id
 
     monkeypatch.setattr("gitea_codex_bot.workers.dispatcher.GiteaClient", _FakeGiteaClient)
 
-    settings = get_settings()
-    processed = process_one_job(settings)
-    assert processed is True
+    assert process_one_job(get_settings()) is True
+    assert posted_ids == [990]
 
     with session_factory() as session:
         persisted_comment_id = get_persistent_review_comment_id(session, "acme/repo", 9)
@@ -107,15 +97,10 @@ def test_process_one_job_passes_full_trigger_message_to_runner(monkeypatch) -> N
         def post_issue_comment(self, _repo: str, _pr_number: int, _body: str) -> int:
             return 901
 
-        def edit_issue_comment(self, _repo: str, _comment_id: int, _body: str) -> int:
-            return _comment_id
-
     monkeypatch.setattr("gitea_codex_bot.workers.dispatcher.run_review_ephemeral", _fake_run_review_ephemeral)
     monkeypatch.setattr("gitea_codex_bot.workers.dispatcher.GiteaClient", _FakeGiteaClient)
 
-    settings = get_settings()
-    processed = process_one_job(settings)
-    assert processed is True
+    assert process_one_job(get_settings()) is True
     assert captured["raw"] == "@codex review security --full\nFocus auth/session handling."
 
 
@@ -155,9 +140,7 @@ def test_process_one_job_skips_review_when_repo_config_disabled(monkeypatch) ->
 
     monkeypatch.setattr("gitea_codex_bot.workers.dispatcher.GiteaClient", _FakeGiteaClient)
 
-    settings = get_settings()
-    processed = process_one_job(settings)
-    assert processed is True
+    assert process_one_job(get_settings()) is True
     assert any("Review is disabled" in body for body in posted_comments)
 
     with session_factory() as session:
diff --git a/tests/test_main_pages.py b/tests/test_main_pages.py
index fd6443a..6024a94 100644
--- a/tests/test_main_pages.py
+++ b/tests/test_main_pages.py
@@ -2,7 +2,9 @@ from __future__ import annotations
 
 from fastapi.testclient import TestClient
 
+from gitea_codex_bot.db import get_session_factory
 from gitea_codex_bot.main import app
+from gitea_codex_bot.models import JobStatus, ReviewJob
 
 
 def test_root_returns_tailwind_landing_page() -> None:
@@ -15,8 +17,10 @@ def test_root_returns_tailwind_landing_page() -> None:
     assert "Gitea Codex Review Bot" in response.text
     assert "cdn.tailwindcss.com" in response.text
     assert 'id="health-button"' in response.text
+    assert 'id="failure-button"' in response.text
     assert 'id="health-modal"' in response.text
     assert 'fetch("/healthz"' in response.text
+    assert 'fetch("/healthz/latest-failure"' in response.text
 
 
 def test_404_returns_tailwind_page_for_browser_requests() -> None:
@@ -38,3 +42,104 @@ def test_404_returns_json_for_non_browser_requests() -> None:
     assert response.status_code == 404
     assert response.headers["content-type"].startswith("application/json")
     assert response.json() == {"detail": "Not Found"}
+
+
+def test_healthz_latest_failure_returns_empty_when_no_failed_jobs() -> None:
+    client = TestClient(app)
+    response = client.get("/healthz/latest-failure")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok", "has_failed_job": False}
+
+
+def test_healthz_latest_failure_returns_latest_failed_job() -> None:
+    session_factory = get_session_factory()
+    with session_factory() as session:
+        first = ReviewJob(
+            repo="acme/repo",
+            pr_number=1,
+            head_sha="1111111",
+            trigger_comment_id=3001,
+            trigger_comment_body="@codex review",
+            command="review",
+            requested_by="alice",
+            status=JobStatus.failed,
+            last_error="first error",
+        )
+        second = ReviewJob(
+            repo="acme/repo",
+            pr_number=2,
+            head_sha="2222222",
+            trigger_comment_id=3002,
+            trigger_comment_body="@codex rerun",
+            command="rerun",
+            requested_by="bob",
+            status=JobStatus.failed,
+            last_error="second error",
+        )
+        session.add(first)
+        session.add(second)
+        session.commit()
+
+    client = TestClient(app)
+    response = client.get("/healthz/latest-failure")
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["status"] == "ok"
+    assert payload["has_failed_job"] is True
+    assert payload["repo"] == "acme/repo"
+    assert payload["pr_number"] == 2
+    assert payload["command"] == "rerun"
+    assert payload["head_sha"] == "2222222"
+    assert payload["error"] == "second error"
+
+
+def test_healthz_latest_job_returns_empty_when_no_jobs() -> None:
+    client = TestClient(app)
+    response = client.get("/healthz/latest-job")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok", "has_job": False}
+
+
+def test_healthz_latest_job_returns_latest_job_details() -> None:
+    session_factory = get_session_factory()
+    with session_factory() as session:
+        first = ReviewJob(
+            repo="acme/repo",
+            pr_number=3,
+            head_sha="3333333",
+            trigger_comment_id=3003,
+            trigger_comment_body="@codex review",
+            command="review",
+            requested_by="alice",
+            status=JobStatus.succeeded,
+            result_json={"summary": "first summary"},
+        )
+        second = ReviewJob(
+            repo="acme/repo",
+            pr_number=4,
+            head_sha="4444444",
+            trigger_comment_id=3004,
+            trigger_comment_body="@codex rerun",
+            command="rerun",
+            requested_by="bob",
+            status=JobStatus.failed,
+            last_error="failed later",
+            result_json={"summary": "second summary"},
+        )
+        session.add(first)
+        session.add(second)
+        session.commit()
+
+    client = TestClient(app)
+    response = client.get("/healthz/latest-job")
+    assert response.status_code == 200
+    payload = response.json()
+    assert payload["status"] == "ok"
+    assert payload["has_job"] is True
+    assert payload["repo"] == "acme/repo"
+    assert payload["pr_number"] == 4
+    assert payload["command"] == "rerun"
+    assert payload["head_sha"] == "4444444"
+    assert payload["job_status"] == "failed"
+    assert payload["error"] == "failed later"
+    assert payload["result_summary"] == "second summary"
diff --git a/tests/test_webhook.py b/tests/test_webhook.py
index fd79739..10afba5 100644
--- a/tests/test_webhook.py
+++ b/tests/test_webhook.py
@@ -93,6 +93,47 @@ def test_webhook_accepts_review_and_queues(monkeypatch) -> None:
         assert queued.trigger_comment_body == "@codex review security"
 
 
+def test_webhook_uses_latest_pr_head_sha_when_config_lookup_fails(monkeypatch) -> None:
+    posted_comments: list[str] = []
+
+    def _post_issue_comment(self, repo: str, pr_number: int, body: str) -> int:
+        posted_comments.append(body)
+        return 100
+
+    monkeypatch.setattr("gitea_codex_bot.services.gitea.GiteaClient.post_issue_comment", _post_issue_comment)
+    monkeypatch.setattr(
+        "gitea_codex_bot.services.gitea.GiteaClient.get_pull_request",
+        lambda *_args, **_kwargs: type("PR", (), {"head_sha": "newsha123"})(),
+    )
+    monkeypatch.setattr(
+        "gitea_codex_bot.services.gitea.GiteaClient.get_file_content",
+        lambda *_args, **_kwargs: (_ for _ in ()).throw(RuntimeError("config unavailable")),
+    )
+
+    client = TestClient(app)
+    payload_obj = _payload("@codex review", username="alice", comment_id=112)
+    payload_obj["pull_request"]["head"]["sha"] = "oldsha999"
+    raw = json.dumps(payload_obj).encode()
+
+    response = client.post(
+        "/webhook/gitea",
+        content=raw,
+        headers={
+            "X-Gitea-Event": "issue_comment",
+            "X-Gitea-Delivery": "d-2b",
+            "X-Gitea-Signature": _sign(raw),
+            "Content-Type": "application/json",
+        },
+    )
+    assert response.status_code == 200
+    assert response.json()["status"] == "queued"
+    assert any("`newsha1`" in body for body in posted_comments)
+    session_factory = get_session_factory()
+    with session_factory() as session:
+        queued = session.execute(select(ReviewJob).where(ReviewJob.trigger_comment_id == 112)).scalar_one()
+        assert queued.head_sha == "newsha123"
+
+
 def test_webhook_logs_when_no_codex_review_command(monkeypatch) -> None:
     messages: list[str] = []
 
