# Apply Progress: Notification Center

## TDD Cycle Evidence (PR-1)

| Cycle | Task | Test File | RED | GREEN | Evidence |
|-------|------|-----------|-----|-------|----------|
| 1 | NC-PR1-004 (basic CRUD) | `tests/unit/test_notification_service.py` | 13 tests written against missing service | All 13 pass | `pytest tests/unit/test_notification_service.py` → 13 passed |
| 2 | NC-PR1-005 (edge cases) | `tests/unit/test_notification_service.py` | Already included in cycle 1 | Added wrong-owner, mute-categories, cross-user isolation | Same 13 tests pass |
| 3 | NC-PR1-007 (basic endpoints) | `tests/integration/test_notifications_api.py` | 10 tests written against missing router | All 10 pass | `pytest tests/integration/test_notifications_api.py` → 10 passed |
| 4 | NC-PR1-008 (API edge cases) | `tests/integration/test_notifications_api.py` | Already included in cycle 3 | Pagination, 404 ownership, mute categories at API layer | Same 10 tests pass |
| 5 | NC-PR1-010 (REFACTOR) | All files | — | ruff clean, no regressions | `ruff check` passes on all new files; existing unit tests 223 passed (4 pre-existing failures unrelated) |

## TDD Cycle Evidence (PR-2)

| Cycle | Task | Test File | RED | GREEN | Evidence |
|-------|------|-----------|-----|-------|----------|
| 1 | NC-PR2-004 (producer flow) | `tests/integration/test_notifications_lifecycle.py` | 4 tests written against unwired producers | Wired `lifecycle_hooks.py` and `health_monitor.py` | 4 passed |
| 2 | NC-PR2-004 (severity mapping) | `tests/integration/test_notifications_lifecycle.py` | Added error + warning severity tests | Already green from implementation | 6 passed |
| 3 | NC-PR2-003 (UserConfig schema) | `src/api/user_config.py` | Schema extended with new optional fields | PATCH/GET endpoints validate correctly | Verified manually |
| 4 | NC-PR2-005 (REFACTOR) | All files | — | ruff clean, no regressions across 41 related tests | All pass |

## Completed Tasks

### PR-1: Backend Core
- [x] NC-PR1-001: Alembic migration for `notifications` table
- [x] NC-PR1-002: SQLAlchemy `Notification` model (`apps/api/src/models/notification.py`)
- [x] NC-PR1-003: Export `Notification` in `models/__init__.py`
- [x] NC-PR1-004: NotificationService unit tests — basic CRUD (RED)
- [x] NC-PR1-005: Implement `NotificationService` singleton (GREEN)
- [x] NC-PR1-006: Service edge-case and isolation tests (TRIANGULATE)
- [x] NC-PR1-007: API integration tests — basic endpoints (RED)
- [x] NC-PR1-008: Implement FastAPI router + Pydantic schemas (GREEN)
- [x] NC-PR1-009: API edge-case and ownership tests (TRIANGULATE)
- [x] NC-PR1-010: Register router in `main.py` + import `Notification` for Alembic
- [x] NC-PR1-011: Code quality pass — ruff, test regressions, smoke tests (REFACTOR)

### PR-2: Backend Integration
- [x] NC-PR2-001: Wire `lifecycle_hooks.py` to `NotificationService`
- [x] NC-PR2-002: Wire `health_monitor.py` to `NotificationService`
- [x] NC-PR2-003: Extend `UserConfig` schema for notification preferences
- [x] NC-PR2-004: Event producer integration tests (RED)
- [x] NC-PR2-005: Verify producer tests pass and clean up (GREEN / REFACTOR)

## Files Changed

### PR-1 Files
1. `apps/api/alembic/versions/2026_05_29_add_notifications_table.py` *(new)* — Alembic migration
2. `apps/api/src/models/notification.py` *(new)* — SQLAlchemy model
3. `apps/api/src/models/__init__.py` — Export `Notification`
4. `apps/api/src/services/notification_service.py` *(new)* — `NotificationService` singleton
5. `apps/api/src/api/notifications.py` *(new)* — FastAPI router + Pydantic schemas
6. `apps/api/src/api/__init__.py` — Export `notifications_router`
7. `apps/api/src/main.py` — Register router, import `Notification` for Alembic
8. `apps/api/tests/unit/test_notification_service.py` *(new)* — 13 unit tests
9. `apps/api/tests/integration/test_notifications_api.py` *(new)* — 10 integration tests
10. `apps/api/tests/integration/test_models.py` — Updated expected tables list

### PR-2 Files
11. `apps/api/src/services/lifecycle_hooks.py` — Wired `NotificationService` after event bus publish
12. `apps/api/src/services/health_monitor.py` — Wired `NotificationService` after state change event publish
13. `apps/api/src/api/user_config.py` — Added `notification_mute_categories` and `notification_toast_level` to Pydantic schemas
14. `apps/api/tests/integration/test_notifications_lifecycle.py` *(new)* — 6 integration tests for event-to-notification flow

## Test Commands & Exit Codes

### PR-1
```bash
# Unit tests for NotificationService (13 tests)
cd apps/api && python -m pytest tests/unit/test_notification_service.py -v
# Exit: 0 — 13 passed

# Integration tests for notifications API (10 tests)
cd apps/api && python -m pytest tests/integration/test_notifications_api.py -v
# Exit: 0 — 10 passed

# Existing unit tests (no regressions in our code)
cd apps/api && python -m pytest tests/unit/ -v
# Exit: 1 — 223 passed, 4 failed (pre-existing failures in test_config.py and test_git_repository_clone_preflight.py)
```

### PR-2
```bash
# New integration tests for event producers (6 tests)
cd apps/api && python -m pytest tests/integration/test_notifications_lifecycle.py -v
# Exit: 0 — 6 passed

# NotificationService unit tests (no regressions)
cd apps/api && python -m pytest tests/unit/test_notification_service.py -v
# Exit: 0 — 13 passed

# Notifications API integration tests (no regressions)
cd apps/api && python -m pytest tests/integration/test_notifications_api.py -v
# Exit: 0 — 10 passed

# Health monitor unit tests (no regressions)
cd apps/api && python -m pytest tests/unit/test_health_monitor.py -v
# Exit: 0 — 6 passed

# Event integration tests (no regressions)
cd apps/api && python -m pytest tests/integration/test_events.py -v
# Exit: 0 — 6 passed

# Combined relevant test suite (41 tests)
cd apps/api && python -m pytest \
  tests/unit/test_notification_service.py \
  tests/integration/test_notifications_api.py \
  tests/integration/test_notifications_lifecycle.py \
  tests/unit/test_health_monitor.py \
  tests/integration/test_events.py \
  -v
# Exit: 0 — 41 passed

# Ruff linting on all PR-2 modified files
cd apps/api && python -m ruff check \
  src/services/lifecycle_hooks.py \
  src/services/health_monitor.py \
  src/api/user_config.py \
  tests/integration/test_notifications_lifecycle.py
# Exit: 0 — All checks passed
```

## Deviations from Design

### PR-1
- **SQLAlchemy `metadata` column name conflict:** `Base.metadata` is reserved by SQLAlchemy DeclarativeBase. Used `notification_metadata` as the Python attribute name with DB column name `"metadata"`. In the Pydantic response model, used `Field(serialization_alias="metadata")` so the JSON API still exposes `metadata` as specified.
- **`created_at` type in Pydantic:** Used `datetime` instead of `str` to leverage FastAPI's automatic ISO serialization.

### PR-2
- None. All mappings and behaviors match the design spec (section 1.3) and task requirements exactly.

## Surprises / Decisions

### PR-1
1. **SQLite `func.now()` resolution:** `test_list_notifications_orders_by_created_at_desc` failed because multiple rapid INSERTs got identical timestamps. Fixed by explicitly setting `created_at` offsets in the test after creation.
2. **Pre-existing integration test failures:** ~40 integration tests fail due to missing `asyncpg` module and direct PostgreSQL connection attempts in their custom setup code. These are unrelated to our changes.
3. **Pre-existing `test_models.py` outdated:** The `test_expected_tables_are_registered` assertion had a hardcoded set missing many newer tables. Updated it to include all current tables (including `notifications`).

### PR-2
1. **Health monitor `test_health_monitor_unhealthy_creates_warning_notification` required `public_url`:** The health monitor only checks tunnel health when `instance.public_url` is truthy. Without setting it on the test fixture instance, `_derive_status` returned `"running"` instead of `"unhealthy"`, which created an `"info"` notification. Fixed by setting `test_instance.public_url` in the test before calling `_check_instance`.
2. **Patch target for failure test:** The `test_notification_failure_does_not_block_event_pipeline` patches `src.services.lifecycle_hooks.notification_service.create_notification`. This only works because `lifecycle_hooks.py` imports `notification_service` at module level, making the attribute resolvable by `unittest.mock.patch`.
3. **No schema migration needed for UserConfig:** Preferences are stored in the existing JSON `config` blob, consistent with the existing pattern (theme, editor, git identity). No Alembic migration required.

## Remaining Tasks

- [ ] PR-3: Frontend Core (NC-PR3-001 through NC-PR3-012)
- [ ] PR-4: Toast Coordination (NC-PR4-001 through NC-PR4-006)

## PR Boundary

This progress covers PR-1 and PR-2. PR-3 (frontend core — NotificationProvider, useNotifications, NotificationCenter, NotificationItem, styles, AppShell integration) and PR-4 (toast coordination — EventToastBridge preferences, settings UI) are out of scope.