docs: refresh CLAUDE.md for /healthz, JSON logs, Session 2

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -47,14 +47,19 @@ then restart.
 
 ## Current Project State
 
-* **Phase**: shipped MVP + posting ledger. Working daily-use tool.
+* **Phase**: shipped MVP + posting ledger + template-entry edit +
-* **Last worked on**: 2026-04-17
+  platform-deploy prep (`/healthz`, structured JSON logs). Working
-* **Last commit on main**: `19cac8f` — Backing transaction ledger:
+  daily-use tool; first production deploy to home-ctr-onyx pending.
-  Postings replace the applied field (#20)
+* **Last worked on**: 2026-04-19
+* **Last commit on main**: `1296258` — chore: silence jsonlogger
+  deprecation, fix LogQL example (#26, #27)
 * **Open PRs**: none
-* **Open issues**: none
+* **Open issues**: #28 Dockerfile, #29 compose.yml, #30 Forgejo
-* **Test count**: 117 / 117 passing
+  Actions deploy workflow (dependency-chained); #31 small cleanups
-* **Migrations**: 5 applied; latest `cc60e7f73a1c`
+  (non-blocking polish)
+* **Test count**: 148 / 148 passing
+* **Migrations**: 5 applied; latest `cc60e7f73a1c` (no schema change
+  in #26 or #27)
 * **Blocking issues**: none
 
 After pulling new work, always:
@@ -70,6 +75,36 @@ the live DB.
 
 Most recent 3 sessions (full history in the [wiki](https://forgejo.labbity.unbiasedgeek.com/archeious/quartermaster/wiki)).
 
+### Session 2 — 2026-04-19
+
+Platform contract intake (#25) filled out and accepted; platform team
+provisioned DNS (`quartermaster.unbiasedgeek.com`), Traefik middlewares
+(basic-auth + rate-limit), the `/mnt/quartermaster/` bind mount, and
+basic-auth creds. Two issues landed on main (#26 `/healthz`, #27
+structured JSON logs) via the superpowers brainstorm → spec → plan →
+subagent-driven-TDD workflow. Thirteen commits on a single branch
+(`feat/platform-deploy-prep`), rebased onto origin/main so history
+stays linear despite the unrelated MCP-doc PR that landed alongside.
+
+Key decisions: single-source-of-truth `logconfig.json` (not a Python
+dict + YAML shim, which would need `pyyaml` and introduce drift); five
+seed app events (`month_created`, `month_closed`,
+`template_entry_updated`, `posting_added`, `posting_deleted`) placed
+after commit + refresh so they only fire on durable success; `/healthz`
+on a dedicated router as a file boundary, with auth living in Traefik
+per the platform contract.
+
+Two real misses caught by code review mid-flight: the autouse-fixture
+workaround for Task 3's `dictConfig` state leak was wrong (fix: make
+the contaminating test save/restore state itself); the third LogQL
+example in README used `{{.path}}` on `month_closed` records that
+carry `year_month`, not `path`. Both landed as fix commits.
+
+Deploy-pipeline work queued as #28 (Dockerfile), #29 (compose.yml),
+#30 (Forgejo Actions), dependency-chained. Polish umbrella at #31.
+
+Full retro: [Session2](https://forgejo.labbity.unbiasedgeek.com/archeious/quartermaster/wiki/Session2).
+
 ### Session 1 — 2026-04-17
 
 Greenfield to working ledger. 10 PRs merged in one sitting:

README.md

@@ -37,11 +37,32 @@ The SQLite file lives at `./quartermaster.db` by default. Override with the
 ## Run
 
 ```sh
-uv run uvicorn quartermaster.main:app --reload
+uv run uvicorn quartermaster.main:app \
+    --log-config src/quartermaster/logconfig.json \
+    --reload
 ```
 
 Open http://127.0.0.1:8000.
 
+## Logs
+
+Logs are JSON on stdout. Each line has `level` and `event` as queryable
+Loki labels (indexed by Promtail on the deploy host), plus arbitrary
+extra fields in the JSON body.
+
+Example LogQL queries in Grafana Explore (Loki data source):
+
+```
+{container="quartermaster"} | json
+{container="quartermaster", event="http_request", status=~"5.."}
+{container="quartermaster", event="month_closed"} | json | line_format "{{.year_month}} {{.message}}"
+```
+
+HTTP access logs appear as `event="http_request"` with `method`, `path`,
+`status`, and `client_ip` extras. Application events (`month_created`,
+`month_closed`, `template_entry_updated`, `posting_added`,
+`posting_deleted`) fire at the matching mutation sites.
+
 ## Tests
 
 ```sh

docs/superpowers/plans/2026-04-19-healthz-and-json-logs.md

@@ -0,0 +1,835 @@
+# Healthz + Structured JSON Logs Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Add `GET /healthz` endpoint and structured JSON logging to stdout so Quartermaster can satisfy the homelab platform contract (#25) for its first deploy.
+
+**Architecture:** One new logging module (`logging_config.py`) loads a JSON config (`src/quartermaster/logconfig.json`) and exposes an `AccessLogFilter` that enriches uvicorn access records with `event="http_request"` and request metadata. One new router module (`routes_health.py`) handles `/healthz`. Five seed events (`logger.info(..., extra={"event": ...})`) are sprinkled at the five most operationally interesting mutations so the Loki view is useful on day one.
+
+**Tech Stack:** Python 3.12, FastAPI, uvicorn, SQLAlchemy, pytest, `python-json-logger`.
+
+**Spec:** `docs/superpowers/specs/2026-04-19-healthz-and-json-logs-design.md`
+
+---
+
+## File Structure
+
+New files:
+
+| Path | Responsibility |
+|---|---|
+| `src/quartermaster/logconfig.json` | uvicorn/stdlib `dictConfig` — formatter, filter, handler, loggers |
+| `src/quartermaster/logging_config.py` | Loads `logconfig.json` into `LOG_CONFIG`; defines `AccessLogFilter` |
+| `src/quartermaster/routes_health.py` | `GET /healthz` router |
+| `tests/test_logging.py` | Formatter + filter unit tests + drift/load tests |
+| `tests/test_health.py` | Healthz endpoint tests (200 + 503) |
+
+Modified files:
+
+| Path | Change |
+|---|---|
+| `pyproject.toml` | Add `python-json-logger` to `[project].dependencies` |
+| `src/quartermaster/main.py` | Include the health router |
+| `src/quartermaster/service.py` | Add one `logger.info` seed call in `update_entry` |
+| `src/quartermaster/month_service.py` | Add four `logger.info` seed calls in `create_month`, `close_month`, `add_posting`, `delete_posting` |
+| `README.md` | Add "Logs" section; update Run block to mention `--log-config` |
+
+Ship logging first, then healthz.
+
+---
+
+## Task 1: Add `python-json-logger` dependency
+
+**Files:**
+- Modify: `pyproject.toml`
+
+- [ ] **Step 1: Edit `pyproject.toml`**
+
+Add `"python-json-logger>=3.2.0",` to the `dependencies` list. The resulting block should read:
+
+```toml
+dependencies = [
+    "alembic>=1.18.4",
+    "fastapi>=0.136.0",
+    "jinja2>=3.1.6",
+    "python-json-logger>=3.2.0",
+    "python-multipart>=0.0.26",
+    "sqlalchemy>=2.0.49",
+    "uvicorn[standard]>=0.44.0",
+]
+```
+
+- [ ] **Step 2: Sync the lock file**
+
+Run: `uv sync`
+Expected: `uv.lock` updated; no errors.
+
+- [ ] **Step 3: Confirm the import works**
+
+Run: `uv run python -c "from pythonjsonlogger.jsonlogger import JsonFormatter; print(JsonFormatter)"`
+Expected: prints `<class 'pythonjsonlogger.jsonlogger.JsonFormatter'>` and exits 0.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add pyproject.toml uv.lock
+git commit -m "chore: add python-json-logger dependency (#27)"
+```
+
+---
+
+## Task 2: Add JSON log config + formatter test
+
+**Files:**
+- Create: `src/quartermaster/logconfig.json`
+- Create: `src/quartermaster/logging_config.py`
+- Test: `tests/test_logging.py`
+
+- [ ] **Step 1: Write the failing test**
+
+Create `tests/test_logging.py`:
+
+```python
+from __future__ import annotations
+
+import io
+import json
+import logging
+
+from quartermaster.logging_config import LOG_CONFIG
+
+
+def _build_formatter():
+    """Instantiate the JSON formatter from LOG_CONFIG for direct testing."""
+    from pydoc import locate
+
+    cfg = dict(LOG_CONFIG["formatters"]["json"])
+    factory_path = cfg.pop("()")
+    factory = locate(factory_path)
+    assert factory is not None, f"formatter factory not importable: {factory_path}"
+    return factory(**cfg)
+
+
+def test_log_config_emits_json_with_required_fields():
+    formatter = _build_formatter()
+    stream = io.StringIO()
+    handler = logging.StreamHandler(stream)
+    handler.setFormatter(formatter)
+
+    logger = logging.getLogger("tests.logging_smoke")
+    logger.handlers = [handler]
+    logger.propagate = False
+    logger.setLevel(logging.INFO)
+
+    logger.info("smoke message", extra={"event": "smoke"})
+
+    line = stream.getvalue().strip()
+    assert line, "formatter produced no output"
+    payload = json.loads(line)
+
+    assert payload["event"] == "smoke"
+    assert payload["level"] == "INFO"
+    assert payload["logger"] == "tests.logging_smoke"
+    assert payload["message"] == "smoke message"
+    assert "timestamp" in payload
+```
+
+- [ ] **Step 2: Run the test and verify it fails**
+
+Run: `uv run pytest tests/test_logging.py -v`
+Expected: FAIL with `ModuleNotFoundError: No module named 'quartermaster.logging_config'`.
+
+- [ ] **Step 3: Create `src/quartermaster/logconfig.json`**
+
+```json
+{
+  "version": 1,
+  "disable_existing_loggers": false,
+  "formatters": {
+    "json": {
+      "()": "pythonjsonlogger.jsonlogger.JsonFormatter",
+      "format": "%(asctime)s %(levelname)s %(name)s %(message)s",
+      "rename_fields": {
+        "asctime": "timestamp",
+        "levelname": "level",
+        "name": "logger"
+      }
+    }
+  },
+  "filters": {
+    "access": {
+      "()": "quartermaster.logging_config.AccessLogFilter"
+    }
+  },
+  "handlers": {
+    "stdout": {
+      "class": "logging.StreamHandler",
+      "stream": "ext://sys.stdout",
+      "formatter": "json"
+    },
+    "access": {
+      "class": "logging.StreamHandler",
+      "stream": "ext://sys.stdout",
+      "formatter": "json",
+      "filters": ["access"]
+    }
+  },
+  "loggers": {
+    "quartermaster": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn.error": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn.access": {
+      "level": "INFO",
+      "handlers": ["access"],
+      "propagate": false
+    }
+  },
+  "root": {
+    "level": "INFO",
+    "handlers": ["stdout"]
+  }
+}
+```
+
+- [ ] **Step 4: Create `src/quartermaster/logging_config.py`**
+
+```python
+from __future__ import annotations
+
+import json
+import logging
+from pathlib import Path
+
+_CONFIG_PATH = Path(__file__).parent / "logconfig.json"
+LOG_CONFIG = json.loads(_CONFIG_PATH.read_text())
+
+
+class AccessLogFilter(logging.Filter):
+    """Enrich uvicorn access records with structured fields for Loki.
+
+    Uvicorn emits access records whose ``args`` tuple is
+    ``(client_addr, method, full_path, http_version, status_code)``.
+    """
+
+    def filter(self, record: logging.LogRecord) -> bool:
+        args = record.args
+        if isinstance(args, tuple) and len(args) >= 5:
+            record.event = "http_request"
+            record.client_ip = args[0]
+            record.method = args[1]
+            record.path = args[2]
+            record.status = args[4]
+        return True
+```
+
+- [ ] **Step 5: Run the test and verify it passes**
+
+Run: `uv run pytest tests/test_logging.py -v`
+Expected: PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/quartermaster/logconfig.json src/quartermaster/logging_config.py tests/test_logging.py
+git commit -m "feat(logging): add JSON log config and formatter (#27)"
+```
+
+---
+
+## Task 3: AccessLogFilter enriches uvicorn access records
+
+**Files:**
+- Modify: `src/quartermaster/logging_config.py` (already has `AccessLogFilter` from Task 2 — this task adds the test to lock in behavior)
+- Test: `tests/test_logging.py`
+
+- [ ] **Step 1: Write the failing test**
+
+Append to `tests/test_logging.py`:
+
+```python
+def test_access_log_filter_enriches_record():
+    from quartermaster.logging_config import AccessLogFilter
+
+    record = logging.LogRecord(
+        name="uvicorn.access",
+        level=logging.INFO,
+        pathname=__file__,
+        lineno=0,
+        msg='%s - "%s %s HTTP/%s" %d',
+        args=("127.0.0.1:1234", "GET", "/healthz", "1.1", 200),
+        exc_info=None,
+    )
+
+    assert AccessLogFilter().filter(record) is True
+    assert record.event == "http_request"
+    assert record.method == "GET"
+    assert record.path == "/healthz"
+    assert record.status == 200
+    assert record.client_ip == "127.0.0.1:1234"
+
+
+def test_access_log_filter_passes_through_non_access_records():
+    """Non-access records (args tuple shape mismatch) are kept, unmodified."""
+    from quartermaster.logging_config import AccessLogFilter
+
+    record = logging.LogRecord(
+        name="quartermaster",
+        level=logging.INFO,
+        pathname=__file__,
+        lineno=0,
+        msg="regular app log",
+        args=None,
+        exc_info=None,
+    )
+
+    assert AccessLogFilter().filter(record) is True
+    assert not hasattr(record, "event") or record.event is None
+    assert not hasattr(record, "method") or record.method is None
+```
+
+- [ ] **Step 2: Run the tests and verify they pass**
+
+Run: `uv run pytest tests/test_logging.py -v`
+Expected: PASS for all four tests (the two from Task 2 plus the two above). `AccessLogFilter` was already implemented in Task 2; these tests codify its contract.
+
+- [ ] **Step 3: Commit**
+
+```bash
+git add tests/test_logging.py
+git commit -m "test(logging): cover AccessLogFilter contract (#27)"
+```
+
+---
+
+## Task 4: Wire uvicorn to the log config + update README
+
+**Files:**
+- Modify: `README.md`
+
+- [ ] **Step 1: Update the "Run" section of `README.md`**
+
+Replace the current Run block (`uv run uvicorn quartermaster.main:app --reload`) with:
+
+````markdown
+## Run
+
+```sh
+uv run uvicorn quartermaster.main:app \
+    --log-config src/quartermaster/logconfig.json \
+    --reload
+```
+
+Open http://127.0.0.1:8000.
+````
+
+- [ ] **Step 2: Add a "Logs" section to `README.md`**
+
+Insert this section between "Run" and "Tests":
+
+````markdown
+## Logs
+
+Logs are JSON on stdout. Each line has `level` and `event` as queryable
+Loki labels (indexed by Promtail on the deploy host), plus arbitrary
+extra fields in the JSON body.
+
+Example LogQL queries in Grafana Explore (Loki data source):
+
+```
+{container="quartermaster"} | json
+{container="quartermaster", event="http_request", status=~"5.."}
+{container="quartermaster", event="month_closed"} | json | line_format "{{.path}} {{.message}}"
+```
+
+HTTP access logs appear as `event="http_request"` with `method`, `path`,
+`status`, and `client_ip` extras. Application events (`month_created`,
+`month_closed`, `template_entry_updated`, `posting_added`,
+`posting_deleted`) fire at the matching mutation sites.
+````
+
+- [ ] **Step 3: Manual smoke test**
+
+Run: `uv run uvicorn quartermaster.main:app --log-config src/quartermaster/logconfig.json --port 8765 &`
+Then in another shell: `curl -s http://127.0.0.1:8765/ > /dev/null`
+Then: `kill %1`
+
+Expected: uvicorn's stdout shows JSON lines like
+`{"timestamp": "...", "level": "INFO", "logger": "uvicorn.access", "message": "...", "event": "http_request", "client_ip": "127.0.0.1:...", "method": "GET", "path": "/", "status": 200}`.
+
+If the output is plain text, the `--log-config` path is wrong or the JSON file has a syntax error.
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add README.md
+git commit -m "docs: README Logs section and --log-config flag (#27)"
+```
+
+---
+
+## Task 5: Seed app events in `month_service.py`
+
+**Files:**
+- Modify: `src/quartermaster/month_service.py`
+- Test: `tests/test_logging.py`
+
+This task adds `logger.info(..., extra={"event": ...})` calls at four sites: `create_month`, `close_month`, `add_posting`, `delete_posting`.
+
+- [ ] **Step 1: Write the failing tests**
+
+Append to `tests/test_logging.py`:
+
+```python
+import pytest
+from decimal import Decimal
+from datetime import date
+
+from quartermaster import month_service, service
+from quartermaster.models import Section
+
+
+def _make_debt_minimum(db, name="Loan", amount=Decimal("100.00")):
+    from quartermaster.models import Entry
+    entry = Entry(section=Section.debt_minimum, name=name, amount=amount)
+    db.add(entry)
+    db.commit()
+    db.refresh(entry)
+    return entry
+
+
+def test_create_month_logs_month_created_event(db, caplog):
+    caplog.set_level(logging.INFO, logger="quartermaster")
+    month_service.create_month(db, "2026-05")
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "month_created"]
+    assert len(events) == 1
+    assert events[0].levelname == "INFO"
+
+
+def test_close_month_logs_month_closed_event(db, caplog):
+    month = month_service.create_month(db, "2026-06")
+    # move through active → closed with a zero-applied budget (no entries yet)
+    month_service.activate_month(db, month)
+    caplog.clear()
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.close_month(db, month)
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "month_closed"]
+    assert len(events) == 1
+
+
+def test_add_posting_logs_posting_added_event(db, caplog):
+    _make_debt_minimum(db)
+    month = month_service.create_month(db, "2026-07")
+    entry = month.entries[0]
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.add_posting(
+        db, month, entry.id,
+        occurred_on=date(2026, 7, 15),
+        amount=Decimal("25.00"),
+    )
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "posting_added"]
+    assert len(events) == 1
+
+
+def test_delete_posting_logs_posting_deleted_event(db, caplog):
+    _make_debt_minimum(db)
+    month = month_service.create_month(db, "2026-08")
+    entry = month.entries[0]
+    posting = month_service.add_posting(
+        db, month, entry.id,
+        occurred_on=date(2026, 8, 15),
+        amount=Decimal("10.00"),
+    )
+    caplog.clear()
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.delete_posting(db, month, posting.id)
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "posting_deleted"]
+    assert len(events) == 1
+```
+
+- [ ] **Step 2: Run the tests and verify they fail**
+
+Run: `uv run pytest tests/test_logging.py -v -k "logs_"`
+Expected: FAIL — no records with the expected `event` values.
+
+- [ ] **Step 3: Add the module logger and four `logger.info` calls**
+
+At the top of `src/quartermaster/month_service.py`, after the existing imports, add:
+
+```python
+import logging
+
+logger = logging.getLogger("quartermaster.month_service")
+```
+
+Inside `create_month`, immediately before the final `return month` (after `db.commit(); db.refresh(month)`):
+
+```python
+logger.info(
+    "created month snapshot",
+    extra={"event": "month_created", "year_month": month.year_month},
+)
+return month
+```
+
+Inside `close_month`, immediately before the final `return month` (after `db.commit(); db.refresh(month)`):
+
+```python
+logger.info(
+    "closed month",
+    extra={"event": "month_closed", "year_month": month.year_month},
+)
+return month
+```
+
+Inside `add_posting`, immediately before the final `return posting` (after `db.commit(); db.refresh(posting)`):
+
+```python
+logger.info(
+    "added posting",
+    extra={
+        "event": "posting_added",
+        "posting_id": posting.id,
+        "month_entry_id": posting.month_entry_id,
+        "amount": str(posting.amount),
+    },
+)
+return posting
+```
+
+Inside `delete_posting` — look at the full function; it needs the log line at the end, after `db.commit()` and before the function returns. Here is the exact shape:
+
+```python
+def delete_posting(
+    db: Session, month: Month, posting_id: int
+) -> MonthEntry | None:
+    """Delete a posting; return the parent entry so callers can re-render its section."""
+    posting = get_posting(db, month, posting_id)
+    if posting is None:
+        return None
+    entry = posting.entry
+    db.delete(posting)
+    db.commit()
+    logger.info(
+        "deleted posting",
+        extra={"event": "posting_deleted", "posting_id": posting_id},
+    )
+    return entry
+```
+
+(The `posting_id` parameter is captured before the delete, so logging it after commit is safe.)
+
+- [ ] **Step 4: Run the tests and verify they pass**
+
+Run: `uv run pytest tests/test_logging.py -v -k "logs_"`
+Expected: PASS for all four seed-event tests.
+
+- [ ] **Step 5: Run the full test suite**
+
+Run: `uv run pytest`
+Expected: all 137 existing tests plus the 8 new logging tests pass.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/quartermaster/month_service.py tests/test_logging.py
+git commit -m "feat(logging): seed month + posting events (#27)"
+```
+
+---
+
+## Task 6: Seed `template_entry_updated` event in `service.py`
+
+**Files:**
+- Modify: `src/quartermaster/service.py`
+- Test: `tests/test_logging.py`
+
+- [ ] **Step 1: Write the failing test**
+
+Append to `tests/test_logging.py`:
+
+```python
+def test_update_entry_logs_template_entry_updated_event(db, caplog):
+    from quartermaster.models import Entry
+    entry = Entry(section=Section.fixed_bill, name="Power", amount=Decimal("50.00"))
+    db.add(entry)
+    db.commit()
+    db.refresh(entry)
+
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    service.update_entry(db, entry.id, amount=Decimal("55.00"))
+
+    events = [
+        r for r in caplog.records
+        if getattr(r, "event", None) == "template_entry_updated"
+    ]
+    assert len(events) == 1
+    assert events[0].entry_id == entry.id
+```
+
+- [ ] **Step 2: Run the test and verify it fails**
+
+Run: `uv run pytest tests/test_logging.py::test_update_entry_logs_template_entry_updated_event -v`
+Expected: FAIL.
+
+- [ ] **Step 3: Add the module logger and `logger.info` call**
+
+At the top of `src/quartermaster/service.py`, after the existing imports, add:
+
+```python
+import logging
+
+logger = logging.getLogger("quartermaster.service")
+```
+
+Inside `update_entry`, immediately before the final `return entry` (after `db.commit(); db.refresh(entry)`):
+
+```python
+logger.info(
+    "updated template entry",
+    extra={"event": "template_entry_updated", "entry_id": entry.id},
+)
+return entry
+```
+
+- [ ] **Step 4: Run the test and verify it passes**
+
+Run: `uv run pytest tests/test_logging.py::test_update_entry_logs_template_entry_updated_event -v`
+Expected: PASS.
+
+- [ ] **Step 5: Run the full test suite**
+
+Run: `uv run pytest`
+Expected: all tests pass.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/quartermaster/service.py tests/test_logging.py
+git commit -m "feat(logging): seed template_entry_updated event (#27)"
+```
+
+---
+
+## Task 7: `/healthz` success path
+
+**Files:**
+- Create: `src/quartermaster/routes_health.py`
+- Modify: `src/quartermaster/main.py`
+- Test: `tests/test_health.py`
+
+- [ ] **Step 1: Write the failing test**
+
+Create `tests/test_health.py`:
+
+```python
+from __future__ import annotations
+
+
+def test_healthz_returns_ok(client):
+    response = client.get("/healthz")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}
+```
+
+- [ ] **Step 2: Run the test and verify it fails**
+
+Run: `uv run pytest tests/test_health.py -v`
+Expected: FAIL with 404 (route not registered).
+
+- [ ] **Step 3: Create `src/quartermaster/routes_health.py`**
+
+```python
+from __future__ import annotations
+
+import logging
+
+from fastapi import APIRouter, Depends
+from fastapi.responses import JSONResponse
+from sqlalchemy import text
+from sqlalchemy.orm import Session
+
+from quartermaster.db import get_session
+
+logger = logging.getLogger("quartermaster.health")
+
+router = APIRouter()
+
+
+@router.get("/healthz")
+def healthz(db: Session = Depends(get_session)) -> JSONResponse:
+    try:
+        db.execute(text("SELECT 1"))
+    except Exception as exc:
+        logger.warning(
+            "healthz check failed",
+            extra={"event": "healthz_failed", "error_class": type(exc).__name__},
+        )
+        return JSONResponse(
+            status_code=503,
+            content={"status": "error", "detail": type(exc).__name__},
+        )
+    return JSONResponse(status_code=200, content={"status": "ok"})
+```
+
+- [ ] **Step 4: Wire the router into the FastAPI app**
+
+Edit `src/quartermaster/main.py`. Change the imports block and `create_app` to:
+
+```python
+from __future__ import annotations
+
+from pathlib import Path
+
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+
+from quartermaster.routes import router
+from quartermaster.routes_health import router as health_router
+from quartermaster.routes_month import router as month_router
+
+STATIC_DIR = Path(__file__).parent / "static"
+
+
+def create_app() -> FastAPI:
+    app = FastAPI(title="Quartermaster", version="0.1.0")
+    app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")
+    app.include_router(health_router)
+    app.include_router(router)
+    app.include_router(month_router)
+    return app
+
+
+app = create_app()
+```
+
+- [ ] **Step 5: Run the test and verify it passes**
+
+Run: `uv run pytest tests/test_health.py::test_healthz_returns_ok -v`
+Expected: PASS.
+
+- [ ] **Step 6: Commit**
+
+```bash
+git add src/quartermaster/routes_health.py src/quartermaster/main.py tests/test_health.py
+git commit -m "feat(health): add /healthz endpoint (#26)"
+```
+
+---
+
+## Task 8: `/healthz` returns 503 when the DB check fails
+
+**Files:**
+- Test: `tests/test_health.py`
+- No production code changes — the exception handler from Task 7 already covers this.
+
+- [ ] **Step 1: Write the failing test**
+
+Append to `tests/test_health.py`:
+
+```python
+from sqlalchemy.exc import OperationalError
+
+from quartermaster.db import get_session
+from quartermaster.main import create_app
+from fastapi.testclient import TestClient
+
+
+def test_healthz_returns_503_when_db_check_raises():
+    app = create_app()
+
+    def broken_session():
+        class BrokenSession:
+            def execute(self, *args, **kwargs):
+                raise OperationalError("boom", None, Exception("boom"))
+
+            def close(self):
+                pass
+
+        session = BrokenSession()
+        try:
+            yield session
+        finally:
+            session.close()
+
+    app.dependency_overrides[get_session] = broken_session
+
+    with TestClient(app) as client:
+        response = client.get("/healthz")
+
+    assert response.status_code == 503
+    body = response.json()
+    assert body["status"] == "error"
+    assert body["detail"] == "OperationalError"
+```
+
+- [ ] **Step 2: Run the test and verify it passes**
+
+Run: `uv run pytest tests/test_health.py -v`
+Expected: PASS for both tests. The exception handler in Task 7 already implements the 503 path; this test codifies the contract.
+
+- [ ] **Step 3: Run the full suite**
+
+Run: `uv run pytest`
+Expected: all tests pass (137 existing + 9 new logging tests + 2 healthz tests = 148).
+
+- [ ] **Step 4: Commit**
+
+```bash
+git add tests/test_health.py
+git commit -m "test(health): cover 503 on DB failure (#26)"
+```
+
+---
+
+## Post-implementation verification
+
+After Task 8 completes:
+
+- [ ] **Full test suite**
+
+Run: `uv run pytest -v`
+Expected: 148 tests pass.
+
+- [ ] **End-to-end smoke test with the log config**
+
+Run in one shell: `uv run uvicorn quartermaster.main:app --log-config src/quartermaster/logconfig.json --port 8765 &`
+Then: `curl -s http://127.0.0.1:8765/healthz`
+Then: `kill %1`
+
+Expected:
+- `curl` prints `{"status":"ok"}`.
+- uvicorn stdout showed at least one JSON line containing `"event": "http_request"`, `"path": "/healthz"`, `"status": 200`.
+
+- [ ] **Close issues #26 and #27**
+
+Reference the merge commit on both issues. Leave #25 open.
+
+---
+
+## Dependencies and ordering
+
+- Tasks 1 → 2 → 3 → 4 must be sequential (each builds on the last).
+- Task 5 depends on Task 2 (needs LOG_CONFIG in place to test via caplog, though caplog itself does not require the config — independent in practice).
+- Task 6 is independent of 5 but logically belongs after.
+- Tasks 7 → 8 are sequential.
+- Tasks 5, 6, 7 could theoretically run in parallel after Task 4, but linear is cleaner.

docs/superpowers/specs/2026-04-19-healthz-and-json-logs-design.md

@@ -0,0 +1,180 @@
+# Healthcheck endpoint and structured JSON logs
+
+**Date:** 2026-04-19
+**Issues:** #26 (healthz), #27 (JSON logs), part of #25 (platform contract intake)
+
+## Background
+
+The homelab platform contract for Quartermaster (#25) requires two
+things the codebase does not have today:
+
+1. A Docker `HEALTHCHECK` so `container_health_status` is visible to
+   cAdvisor/Prometheus, which in turn drives the container-down alert
+   planned at launch. That requires an in-app endpoint to target.
+2. Structured JSON logs on stdout with `level` and `event` fields so
+   Promtail indexes them as Loki labels.
+
+Both block the first deploy to `home-ctr-onyx`. This spec covers both
+so the work can land as one coherent change.
+
+## /healthz
+
+### Endpoint
+
+`GET /healthz`, unauthenticated.
+
+- Success: `200 {"status": "ok"}`.
+- Failure: `503 {"status": "error", "detail": "<exception class name>"}`.
+  The class name goes in so operators can tell from the response body
+  what tripped the check; no traceback or message is leaked.
+
+The check opens a session via the standard `SessionLocal` factory,
+runs `SELECT 1`, and closes. Any exception surfaces as a 503.
+
+### Placement
+
+New module `src/quartermaster/routes_health.py` with its own
+`APIRouter`, included from `main.create_app()` alongside the existing
+routers. Keeping it on a dedicated router means any future middleware
+(basic-auth, rate-limit bypass) applied to the main routers can leave
+`/healthz` alone — the Docker healthcheck runs inside the container
+and must not need credentials.
+
+### Tests
+
+`tests/test_health.py`:
+
+- Success: FastAPI `TestClient` hits `/healthz`, asserts 200 and
+  `{"status": "ok"}`.
+- Failure: monkey-patch the session factory to raise on `.execute()`,
+  assert 503 and `{"status": "error", "detail": "<class-name>"}`.
+
+## Structured JSON logs
+
+### Dependency
+
+Add `python-json-logger` to `[project].dependencies` in
+`pyproject.toml`. One small, single-purpose dep; no transitive
+surprises. `structlog` is explicitly out of scope (#27).
+
+### Config module
+
+`src/quartermaster/logconfig.json` holds the
+`logging.config.dictConfig`-compatible config. New
+`src/quartermaster/logging_config.py` loads that JSON file at import
+time into `LOG_CONFIG` and defines `AccessLogFilter`. The JSON file is
+the single source of truth — tests import `LOG_CONFIG` via the Python
+module; uvicorn reads the same JSON via its `--log-config` flag. No
+drift risk, no `pyyaml` dep needed.
+
+Config contents:
+
+- One formatter using `pythonjsonlogger.jsonlogger.JsonFormatter`
+  emitting `timestamp` (ISO-8601 UTC), `level`, `event`, `logger`,
+  `message`. `extra={...}` kwargs passed to logger calls flatten into
+  the JSON body.
+- One handler writing to `sys.stdout`.
+- Loggers: the root app logger and `uvicorn.access` both route
+  through the JSON handler. `uvicorn.error` also gets the handler so
+  startup / shutdown lines are captured in the same format.
+
+JSON was picked over YAML because `uvicorn --log-config *.yaml`
+requires `pyyaml` at runtime while `*.json` uses stdlib.
+
+### Access log filter
+
+Uvicorn's access logger emits a record whose message is the raw
+access line; the fields we care about live on the record's positional
+args. A small `logging.Filter` subclass in `logging_config.py` unpacks
+those args and sets:
+
+- `event = "http_request"`
+- `method`, `path`, `status`, `client_ip`
+- `duration_ms` (uvicorn doesn't expose this natively; computed via
+  the `extra` injected by a small middleware if straightforward,
+  otherwise deferred — the filter already gives Loki status + path,
+  which is the main thing)
+
+If the duration cannot be obtained cheaply from uvicorn's access
+record, landing the rest is still a win; the `duration_ms` field can
+come in a follow-up without changing the log schema (it's an extra
+field, not a label).
+
+### Seed application events
+
+Five events added as single-line `logger.info(..., extra={"event":
+"..."})` calls at the matching code paths (names aligned with the
+existing function names):
+
+| Event | Site |
+|---|---|
+| `month_created` | `month_service.create_month` |
+| `month_closed` | `month_service.close_month` |
+| `template_entry_updated` | `service.update_entry` |
+| `posting_added` | `month_service.add_posting` |
+| `posting_deleted` | `month_service.delete_posting` |
+
+One module-scoped logger at the top of each file that touches these
+paths. No broader instrumentation in this change.
+
+### Tests
+
+`tests/test_logging.py`:
+
+- Apply `LOG_CONFIG` via `logging.config.dictConfig`, emit a record
+  with `extra={"event": "smoke"}`, capture stdout via `capsys`,
+  `json.loads` the captured line, assert `level` / `event` /
+  `logger` / `message` / `timestamp` all present and correct.
+- Feed a synthetic uvicorn access record through the filter, assert
+  resulting fields include `event="http_request"`, `method`, `path`,
+  `status`.
+
+No end-to-end uvicorn-subprocess test. Formatter and filter
+correctness at the handler level is enough for the launch contract.
+
+### Dev flow
+
+`uv run uvicorn quartermaster.main:app --log-config
+src/quartermaster/logconfig.json --reload` — `--reload` keeps working.
+README gets a short "Logs" section with two LogQL examples mirroring
+the Archon contract style.
+
+## File additions / changes
+
+New:
+- `src/quartermaster/routes_health.py`
+- `src/quartermaster/logging_config.py`
+- `src/quartermaster/logconfig.json` (single source of truth for the log config)
+- `tests/test_health.py`
+- `tests/test_logging.py`
+
+Changed:
+- `pyproject.toml` — add `python-json-logger`
+- `src/quartermaster/main.py` — include the health router
+- `src/quartermaster/service.py` — add one `logger.info` seed call
+  in `update_entry`
+- `src/quartermaster/month_service.py` — add four `logger.info` seed
+  calls in `create_month`, `close_month`, `add_posting`,
+  `delete_posting`
+- `README.md` — add the "Logs" section and mention `--log-config` in
+  the Run block
+
+Not touched:
+- Dockerfile / Compose: owned by later issues under #25.
+- Alembic / DB layer: the healthcheck uses the existing session
+  factory; no migration.
+
+## Order of work
+
+Logging before healthz. Once `LOG_CONFIG` exists the healthz handler
+can emit `event="healthz_check"` for free; the reverse order doesn't
+give logging anything useful. Not load-bearing.
+
+## Out of scope
+
+- `/readyz` vs. `/livez` split — one endpoint covers this single-
+  container app.
+- `/metrics` or any Prometheus exposition (5.2 in #25 is "not needed").
+- Adding `structlog` (#27 explicitly excludes).
+- Log-shipping configuration — Promtail on the host handles it.
+- Broad app instrumentation beyond the five seed events.

pyproject.toml

@@ -11,6 +11,7 @@ dependencies = [
     "alembic>=1.18.4",
     "fastapi>=0.136.0",
     "jinja2>=3.1.6",
+    "python-json-logger>=3.2.0",
     "python-multipart>=0.0.26",
     "sqlalchemy>=2.0.49",
     "uvicorn[standard]>=0.44.0",

src/quartermaster/logconfig.json

@@ -0,0 +1,59 @@
+{
+  "version": 1,
+  "disable_existing_loggers": false,
+  "formatters": {
+    "json": {
+      "()": "pythonjsonlogger.json.JsonFormatter",
+      "fmt": "%(asctime)s %(levelname)s %(name)s %(message)s",
+      "rename_fields": {
+        "asctime": "timestamp",
+        "levelname": "level",
+        "name": "logger"
+      }
+    }
+  },
+  "filters": {
+    "access": {
+      "()": "quartermaster.logging_config.AccessLogFilter"
+    }
+  },
+  "handlers": {
+    "stdout": {
+      "class": "logging.StreamHandler",
+      "stream": "ext://sys.stdout",
+      "formatter": "json"
+    },
+    "access": {
+      "class": "logging.StreamHandler",
+      "stream": "ext://sys.stdout",
+      "formatter": "json",
+      "filters": ["access"]
+    }
+  },
+  "loggers": {
+    "quartermaster": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn.error": {
+      "level": "INFO",
+      "handlers": ["stdout"],
+      "propagate": false
+    },
+    "uvicorn.access": {
+      "level": "INFO",
+      "handlers": ["access"],
+      "propagate": false
+    }
+  },
+  "root": {
+    "level": "INFO",
+    "handlers": ["stdout"]
+  }
+}

src/quartermaster/logging_config.py

@@ -0,0 +1,26 @@
+from __future__ import annotations
+
+import json
+import logging
+from pathlib import Path
+
+_CONFIG_PATH = Path(__file__).parent / "logconfig.json"
+LOG_CONFIG = json.loads(_CONFIG_PATH.read_text())
+
+
+class AccessLogFilter(logging.Filter):
+    """Enrich uvicorn access records with structured fields for Loki.
+
+    Uvicorn emits access records whose ``args`` tuple is
+    ``(client_addr, method, full_path, http_version, status_code)``.
+    """
+
+    def filter(self, record: logging.LogRecord) -> bool:
+        args = record.args
+        if isinstance(args, tuple) and len(args) >= 5:
+            record.event = "http_request"
+            record.client_ip = args[0]
+            record.method = args[1]
+            record.path = args[2]
+            record.status = args[4]
+        return True

src/quartermaster/main.py

@@ -6,6 +6,7 @@ from fastapi import FastAPI
 from fastapi.staticfiles import StaticFiles
 
 from quartermaster.routes import router
+from quartermaster.routes_health import router as health_router
 from quartermaster.routes_month import router as month_router
 
 STATIC_DIR = Path(__file__).parent / "static"
@@ -14,6 +15,7 @@ STATIC_DIR = Path(__file__).parent / "static"
 def create_app() -> FastAPI:
     app = FastAPI(title="Quartermaster", version="0.1.0")
     app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")
+    app.include_router(health_router)
     app.include_router(router)
     app.include_router(month_router)
     return app

src/quartermaster/month_service.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import logging
 import re
 from dataclasses import dataclass
 from datetime import date, datetime, timezone
@@ -28,6 +29,8 @@ from quartermaster.models import (
     Section,
 )
 
+logger = logging.getLogger("quartermaster.month_service")
+
 YEAR_MONTH_RE = re.compile(r"^\d{4}-(0[1-9]|1[0-2])$")
 
 
@@ -148,6 +151,10 @@ def create_month(db: Session, year_month: str) -> Month:
     )
     db.commit()
     db.refresh(month)
+    logger.info(
+        "created month snapshot",
+        extra={"event": "month_created", "year_month": month.year_month},
+    )
     return month
 
 
@@ -314,6 +321,15 @@ def add_posting(
     db.add(posting)
     db.commit()
     db.refresh(posting)
+    logger.info(
+        "added posting",
+        extra={
+            "event": "posting_added",
+            "posting_id": posting.id,
+            "month_entry_id": posting.month_entry_id,
+            "amount": str(posting.amount),
+        },
+    )
     return posting
 
 
@@ -368,6 +384,10 @@ def delete_posting(
     entry = posting.entry
     db.delete(posting)
     db.commit()
+    logger.info(
+        "deleted posting",
+        extra={"event": "posting_deleted", "posting_id": posting_id},
+    )
     return entry
 
 
@@ -428,6 +448,10 @@ def close_month(db: Session, month: Month) -> Month:
     month.closed_at = datetime.now(timezone.utc)
     db.commit()
     db.refresh(month)
+    logger.info(
+        "closed month",
+        extra={"event": "month_closed", "year_month": month.year_month},
+    )
     return month
 
 

src/quartermaster/routes_health.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import logging
+
+from fastapi import APIRouter, Depends
+from fastapi.responses import JSONResponse
+from sqlalchemy import text
+from sqlalchemy.orm import Session
+
+from quartermaster.db import get_session
+
+logger = logging.getLogger("quartermaster.health")
+
+router = APIRouter()
+
+
+@router.get("/healthz")
+def healthz(db: Session = Depends(get_session)) -> JSONResponse:
+    try:
+        db.execute(text("SELECT 1"))
+    except Exception as exc:
+        logger.warning(
+            "healthz check failed",
+            extra={"event": "healthz_failed", "error_class": type(exc).__name__},
+        )
+        return JSONResponse(
+            status_code=503,
+            content={"status": "error", "detail": type(exc).__name__},
+        )
+    return JSONResponse(status_code=200, content={"status": "ok"})

src/quartermaster/service.py

@@ -1,11 +1,14 @@
 from __future__ import annotations
 
+import logging
 from dataclasses import dataclass
 from decimal import Decimal
 
 from sqlalchemy import select
 from sqlalchemy.orm import Session
 
+logger = logging.getLogger("quartermaster.service")
+
 from quartermaster.groups import (
     GROUP_DEFAULT_OPEN,
     GROUP_LABELS,
@@ -134,6 +137,10 @@ def update_entry(
         entry.notes = _clean_notes(notes)  # type: ignore[arg-type]
     db.commit()
     db.refresh(entry)
+    logger.info(
+        "updated template entry",
+        extra={"event": "template_entry_updated", "entry_id": entry.id},
+    )
     return entry
 
 

tests/test_health.py

@@ -0,0 +1,49 @@
+from __future__ import annotations
+
+import logging
+
+from sqlalchemy.exc import OperationalError
+
+from quartermaster.db import get_session
+from quartermaster.main import create_app
+from fastapi.testclient import TestClient
+
+
+def test_healthz_returns_ok(client):
+    response = client.get("/healthz")
+    assert response.status_code == 200
+    assert response.json() == {"status": "ok"}
+
+
+def test_healthz_returns_503_when_db_check_raises(caplog):
+    app = create_app()
+
+    def broken_session():
+        class BrokenSession:
+            def execute(self, *args, **kwargs):
+                raise OperationalError("boom", None, Exception("boom"))
+
+            def close(self):
+                pass
+
+        session = BrokenSession()
+        try:
+            yield session
+        finally:
+            session.close()
+
+    app.dependency_overrides[get_session] = broken_session
+
+    caplog.set_level(logging.WARNING, logger="quartermaster.health")
+    with TestClient(app) as client:
+        response = client.get("/healthz")
+
+    assert response.status_code == 503
+    body = response.json()
+    assert body["status"] == "error"
+    assert body["detail"] == "OperationalError"
+
+    failed = [r for r in caplog.records if getattr(r, "event", None) == "healthz_failed"]
+    assert len(failed) == 1
+    assert failed[0].levelname == "WARNING"
+    assert failed[0].error_class == "OperationalError"

tests/test_logging.py

@@ -0,0 +1,190 @@
+from __future__ import annotations
+
+import io
+import json
+import logging
+from datetime import date
+from decimal import Decimal
+
+import pytest
+
+from quartermaster import month_service, service
+from quartermaster.logging_config import LOG_CONFIG
+from quartermaster.models import Section
+
+
+def _build_formatter():
+    """Instantiate the JSON formatter from LOG_CONFIG for direct testing."""
+    from pydoc import locate
+
+    cfg = dict(LOG_CONFIG["formatters"]["json"])
+    factory_path = cfg.pop("()")
+    factory = locate(factory_path)
+    assert factory is not None, f"formatter factory not importable: {factory_path}"
+    return factory(**cfg)
+
+
+def test_log_config_emits_json_with_required_fields():
+    formatter = _build_formatter()
+    stream = io.StringIO()
+    handler = logging.StreamHandler(stream)
+    handler.setFormatter(formatter)
+
+    logger = logging.getLogger("tests.logging_smoke")
+    logger.handlers = [handler]
+    logger.propagate = False
+    logger.setLevel(logging.INFO)
+
+    logger.info("smoke message", extra={"event": "smoke"})
+
+    line = stream.getvalue().strip()
+    assert line, "formatter produced no output"
+    payload = json.loads(line)
+
+    assert payload["event"] == "smoke"
+    assert payload["level"] == "INFO"
+    assert payload["logger"] == "tests.logging_smoke"
+    assert payload["message"] == "smoke message"
+    assert "timestamp" in payload
+
+
+def test_access_log_filter_enriches_record():
+    from quartermaster.logging_config import AccessLogFilter
+
+    record = logging.LogRecord(
+        name="uvicorn.access",
+        level=logging.INFO,
+        pathname=__file__,
+        lineno=0,
+        msg='%s - "%s %s HTTP/%s" %d',
+        args=("127.0.0.1:1234", "GET", "/healthz", "1.1", 200),
+        exc_info=None,
+    )
+
+    assert AccessLogFilter().filter(record) is True
+    assert record.event == "http_request"
+    assert record.method == "GET"
+    assert record.path == "/healthz"
+    assert record.status == 200
+    assert record.client_ip == "127.0.0.1:1234"
+
+
+def test_access_log_filter_passes_through_non_access_records():
+    """Non-access records (args tuple shape mismatch) are kept, unmodified."""
+    from quartermaster.logging_config import AccessLogFilter
+
+    record = logging.LogRecord(
+        name="quartermaster",
+        level=logging.INFO,
+        pathname=__file__,
+        lineno=0,
+        msg="regular app log",
+        args=None,
+        exc_info=None,
+    )
+
+    assert AccessLogFilter().filter(record) is True
+    assert not hasattr(record, "event") or record.event is None
+    assert not hasattr(record, "method") or record.method is None
+
+
+def test_log_config_loads_via_dictconfig():
+    """Verify the whole LOG_CONFIG passes logging.config.dictConfig without error."""
+    import logging.config
+
+    from quartermaster.logging_config import LOG_CONFIG
+
+    qm = logging.getLogger("quartermaster")
+    saved_propagate = qm.propagate
+    saved_handlers = qm.handlers[:]
+    saved_level = qm.level
+    try:
+        logging.config.dictConfig(LOG_CONFIG)
+    finally:
+        qm.propagate = saved_propagate
+        qm.handlers = saved_handlers
+        qm.level = saved_level
+
+
+def _make_debt_minimum(db, name="Loan", amount=Decimal("100.00")):
+    from quartermaster.models import Entry
+    entry = Entry(section=Section.debt_minimum, name=name, amount=amount)
+    db.add(entry)
+    db.commit()
+    db.refresh(entry)
+    return entry
+
+
+def test_create_month_logs_month_created_event(db, caplog):
+    caplog.set_level(logging.INFO, logger="quartermaster")
+    month_service.create_month(db, "2026-05")
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "month_created"]
+    assert len(events) == 1
+    assert events[0].levelname == "INFO"
+
+
+def test_close_month_logs_month_closed_event(db, caplog):
+    month = month_service.create_month(db, "2026-06")
+    # move through active → closed with a zero-applied budget (no entries yet)
+    month_service.activate_month(db, month)
+    caplog.clear()
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.close_month(db, month)
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "month_closed"]
+    assert len(events) == 1
+
+
+def test_add_posting_logs_posting_added_event(db, caplog):
+    _make_debt_minimum(db)
+    month = month_service.create_month(db, "2026-07")
+    entry = month.entries[0]
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.add_posting(
+        db, month, entry.id,
+        occurred_on=date(2026, 7, 15),
+        amount=Decimal("25.00"),
+    )
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "posting_added"]
+    assert len(events) == 1
+
+
+def test_delete_posting_logs_posting_deleted_event(db, caplog):
+    _make_debt_minimum(db)
+    month = month_service.create_month(db, "2026-08")
+    entry = month.entries[0]
+    posting = month_service.add_posting(
+        db, month, entry.id,
+        occurred_on=date(2026, 8, 15),
+        amount=Decimal("10.00"),
+    )
+    caplog.clear()
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    month_service.delete_posting(db, month, posting.id)
+
+    events = [r for r in caplog.records if getattr(r, "event", None) == "posting_deleted"]
+    assert len(events) == 1
+
+
+def test_update_entry_logs_template_entry_updated_event(db, caplog):
+    from quartermaster.models import Entry
+    entry = Entry(section=Section.fixed_bill, name="Power", amount=Decimal("50.00"))
+    db.add(entry)
+    db.commit()
+    db.refresh(entry)
+
+    caplog.set_level(logging.INFO, logger="quartermaster")
+
+    service.update_entry(db, entry.id, amount=Decimal("55.00"))
+
+    events = [
+        r for r in caplog.records
+        if getattr(r, "event", None) == "template_entry_updated"
+    ]
+    assert len(events) == 1
+    assert events[0].entry_id == entry.id