feat: add health endpoints, static serving, and base template (Step 7.2)

- Add /healthz endpoint with DB writable check
- Add /metrics endpoint with Prometheus-compatible format (enabled by default)
- Configure static file serving at /static/v1/... with immutable cache headers
- Create base page template with MonsterUI slate theme
- Create industrial farm aesthetic bottom navigation with custom SVG icons
- Add StaticCacheMiddleware for adding cache-control headers

Changes:
- src/animaltrack/web/routes/health.py: Health and metrics endpoints
- src/animaltrack/web/templates/: Base template, nav, and icons
- src/animaltrack/web/app.py: Integrate theme, routes, static serving
- src/animaltrack/config.py: metrics_enabled defaults to True

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/animaltrack/config.py

@@ -36,7 +36,7 @@ class Settings(BaseSettings):
     # Application behavior
     seed_on_start: bool = False
     log_level: str = "INFO"
-    metrics_enabled: bool = False
+    metrics_enabled: bool = True
 
     @cached_property
     def trusted_proxy_ips(self) -> list[str]:

src/animaltrack/web/app.py

@@ -3,9 +3,12 @@
 
 from __future__ import annotations
 
-from fasthtml.common import Beforeware, fast_app
+from pathlib import Path
+
+from fasthtml.common import H1, Beforeware, P, fast_app
+from monsterui.all import Theme
+from starlette.middleware import Middleware
 from starlette.requests import Request
-from starlette.responses import PlainTextResponse
 
 from animaltrack.config import Settings
 from animaltrack.db import get_db
@@ -14,17 +17,48 @@ from animaltrack.web.middleware import (
     csrf_before,
     request_id_before,
 )
+from animaltrack.web.routes import register_health_routes
+from animaltrack.web.templates import page
+
+# Default static directory relative to this module
+DEFAULT_STATIC_DIR = Path(__file__).parent.parent / "static"
+
+
+class StaticCacheMiddleware:
+    """Middleware to add immutable cache headers to static file responses."""
+
+    def __init__(self, app):
+        self.app = app
+
+    async def __call__(self, scope, receive, send):
+        if scope["type"] != "http":
+            await self.app(scope, receive, send)
+            return
+
+        path = scope.get("path", "")
+
+        async def send_with_headers(message):
+            if message["type"] == "http.response.start" and path.startswith("/static/"):
+                headers = list(message.get("headers", []))
+                # Add immutable cache headers for static files
+                headers.append((b"cache-control", b"public, max-age=31536000, immutable"))
+                message = {**message, "headers": headers}
+            await send(message)
+
+        await self.app(scope, receive, send_with_headers)
 
 
 def create_app(
     settings: Settings | None = None,
     db=None,
+    static_dir: Path | None = None,
 ):
     """Create and configure the FastHTML application.
 
     Args:
         settings: Application settings. Loads from env if None.
         db: Database connection. Creates from settings if None.
+        static_dir: Directory for static files. Uses default if None.
 
     Returns:
         Tuple of (app, rt) - the FastHTML app and route decorator.
@@ -64,34 +98,46 @@ def create_app(
             r".*\.css",
             r".*\.js",
             r"/healthz",
+            r"/metrics",
         ],
     )
 
-    # Create FastHTML app with HTMX extensions
+    # Determine static files directory
+    # FastHTML's static_path should point to parent dir since URL path mirrors file path
+    # e.g., for URL /static/v1/app.css, file should be at static_path/static/v1/app.css
+    static_base = static_dir if static_dir is not None else DEFAULT_STATIC_DIR
+    # static_base is typically .../static, parent would be .../
+    # but for URL /static/v1/... we want files at static_base/v1/...
+    # So static_path should be the parent of static_base
+    static_path_for_fasthtml = str(static_base.parent) if static_base.exists() else "."
+
+    # Create FastHTML app with HTMX extensions, MonsterUI theme, and static path
     app, rt = fast_app(
         before=beforeware,
+        hdrs=Theme.slate.headers(),  # Dark industrial theme
         exts=["head-support", "preload"],
+        static_path=static_path_for_fasthtml,
+        middleware=[Middleware(StaticCacheMiddleware)],
     )
 
     # Store settings and db on app state for access in routes
     app.state.settings = settings
     app.state.db = db
 
-    # Register healthz route (excluded from beforeware)
-    @rt("/healthz")
-    def healthz():
-        """Health check endpoint."""
-        # Verify database is writable
-        try:
-            db.execute("SELECT 1")
-            return PlainTextResponse("OK", status_code=200)
-        except Exception as e:
-            return PlainTextResponse(f"Database error: {e}", status_code=503)
+    # Register health routes (healthz, metrics)
+    register_health_routes(rt, app)
 
-    # Placeholder index route (will be replaced with real UI later)
+    # Placeholder index route (will be replaced with Egg Quick Capture later)
     @rt("/")
     def index():
-        """Placeholder index route."""
-        return PlainTextResponse("AnimalTrack", status_code=200)
+        """Placeholder index route - shows egg capture page."""
+        return page(
+            (
+                H1("Egg Quick Capture", cls="text-2xl font-bold mb-4"),
+                P("Coming soon...", cls="text-stone-400"),
+            ),
+            title="Egg - AnimalTrack",
+            active_nav="egg",
+        )
 
     return app, rt

src/animaltrack/web/routes/__init__.py

@@ -0,0 +1,6 @@
+# ABOUTME: Routes package for AnimalTrack web application.
+# ABOUTME: Contains modular route handlers for different features.
+
+from animaltrack.web.routes.health import register_health_routes
+
+__all__ = ["register_health_routes"]

src/animaltrack/web/routes/health.py

@@ -0,0 +1,56 @@
+# ABOUTME: Health and metrics endpoints for AnimalTrack.
+# ABOUTME: Provides /healthz for liveness and /metrics for Prometheus.
+
+from starlette.responses import PlainTextResponse
+
+
+def register_health_routes(rt, app):
+    """Register health and metrics routes.
+
+    Args:
+        rt: FastHTML route decorator
+        app: FastHTML application instance
+    """
+
+    @rt("/healthz")
+    def healthz():
+        """Health check endpoint - verifies database is writable."""
+        try:
+            app.state.db.execute("SELECT 1")
+            return PlainTextResponse("OK", status_code=200)
+        except Exception as e:
+            return PlainTextResponse(f"Database error: {e}", status_code=503)
+
+    @rt("/metrics")
+    def metrics():
+        """Prometheus metrics endpoint.
+
+        Returns metrics in Prometheus text format.
+        Gated by settings.metrics_enabled (default: True).
+        """
+        if not app.state.settings.metrics_enabled:
+            return PlainTextResponse("Not Found", status_code=404)
+
+        # Check database health for metric
+        try:
+            app.state.db.execute("SELECT 1")
+            db_healthy = 1
+        except Exception:
+            db_healthy = 0
+
+        # Build Prometheus text format response
+        lines = [
+            "# HELP animaltrack_up Whether the service is up",
+            "# TYPE animaltrack_up gauge",
+            "animaltrack_up 1",
+            "",
+            "# HELP animaltrack_db_healthy Whether database is healthy",
+            "# TYPE animaltrack_db_healthy gauge",
+            f"animaltrack_db_healthy {db_healthy}",
+            "",
+        ]
+
+        return PlainTextResponse(
+            "\n".join(lines),
+            media_type="text/plain; version=0.0.4; charset=utf-8",
+        )

src/animaltrack/web/templates/__init__.py

@@ -0,0 +1,7 @@
+# ABOUTME: Templates package for AnimalTrack web UI.
+# ABOUTME: Contains reusable UI components built with FastHTML and MonsterUI.
+
+from animaltrack.web.templates.base import page
+from animaltrack.web.templates.nav import BottomNav
+
+__all__ = ["page", "BottomNav"]

src/animaltrack/web/templates/base.py

@@ -0,0 +1,36 @@
+# ABOUTME: Base HTML template for AnimalTrack pages.
+# ABOUTME: Provides consistent layout with MonsterUI theme and bottom nav.
+
+from fasthtml.common import Container, Div, Title
+
+from animaltrack.web.templates.nav import BottomNav, BottomNavStyles
+
+
+def page(content, title: str = "AnimalTrack", active_nav: str = "egg"):
+    """
+    Base page template wrapper with navigation.
+
+    Wraps content with consistent HTML structure including:
+    - Page title
+    - Bottom navigation styling
+    - Content container with nav padding
+    - Fixed bottom navigation bar
+
+    Args:
+        content: Page content (FT components)
+        title: Page title for browser tab
+        active_nav: Active nav item ID ('egg', 'feed', 'move', 'registry')
+
+    Returns:
+        Tuple of FT components for the complete page
+    """
+    return (
+        Title(title),
+        BottomNavStyles(),
+        # Main content with bottom padding for fixed nav
+        Div(
+            Container(content),
+            cls="pb-20 min-h-screen bg-[#0f0f0e] text-stone-100",
+        ),
+        BottomNav(active_id=active_nav),
+    )

src/animaltrack/web/templates/icons.py

@@ -0,0 +1,93 @@
+# ABOUTME: Custom SVG icons for AnimalTrack navigation.
+# ABOUTME: Chunky, recognizable icons designed for outdoor visibility.
+
+from fasthtml.svg import Circle, Path, Svg
+
+
+def EggIcon(active: bool = False):  # noqa: N802
+    """Egg collection icon - simple oval form."""
+    fill = "#b8860b" if active else "#6b6b63"
+    return Svg(
+        Path(
+            d="M12 2C8 2 5 7 5 12C5 17 8 22 12 22C16 22 19 17 19 12C19 7 16 2 12 2Z",
+            fill=fill,
+            stroke=fill,
+            stroke_width="1.5",
+        ),
+        viewBox="0 0 24 24",
+        width="28",
+        height="28",
+    )
+
+
+def FeedIcon(active: bool = False):  # noqa: N802
+    """Feed bucket icon - utilitarian container."""
+    fill = "#b8860b" if active else "#6b6b63"
+    return Svg(
+        Path(
+            d="M4 6H20L18 20H6L4 6Z",
+            fill="none",
+            stroke=fill,
+            stroke_width="2",
+            stroke_linejoin="round",
+        ),
+        Path(d="M2 6H22", stroke=fill, stroke_width="2", stroke_linecap="round"),
+        Path(
+            d="M9 10V16M12 10V16M15 10V16",
+            stroke=fill,
+            stroke_width="1.5",
+            stroke_linecap="round",
+        ),
+        viewBox="0 0 24 24",
+        width="28",
+        height="28",
+    )
+
+
+def MoveIcon(active: bool = False):  # noqa: N802
+    """Move/relocate icon - directional arrows."""
+    fill = "#b8860b" if active else "#6b6b63"
+    return Svg(
+        Path(
+            d="M12 4L12 20M12 4L8 8M12 4L16 8",
+            stroke=fill,
+            stroke_width="2",
+            stroke_linecap="round",
+            stroke_linejoin="round",
+        ),
+        Path(
+            d="M4 12L20 12M4 12L8 8M4 12L8 16",
+            stroke=fill,
+            stroke_width="2",
+            stroke_linecap="round",
+            stroke_linejoin="round",
+        ),
+        viewBox="0 0 24 24",
+        width="28",
+        height="28",
+    )
+
+
+def RegistryIcon(active: bool = False):  # noqa: N802
+    """Registry/list icon - stacked rows like ledger."""
+    fill = "#b8860b" if active else "#6b6b63"
+    return Svg(
+        Path(d="M4 6H8M12 6H20", stroke=fill, stroke_width="2", stroke_linecap="round"),
+        Path(d="M4 12H8M12 12H20", stroke=fill, stroke_width="2", stroke_linecap="round"),
+        Path(d="M4 18H8M12 18H20", stroke=fill, stroke_width="2", stroke_linecap="round"),
+        Circle(cx="6", cy="6", r="2", fill=fill),
+        Circle(cx="6", cy="12", r="2", fill=fill),
+        Circle(cx="6", cy="18", r="2", fill=fill),
+        viewBox="0 0 24 24",
+        width="28",
+        height="28",
+    )
+
+
+# Icon mapping by nav item ID
+NAV_ICONS = {
+    "egg": EggIcon,
+    "feed": FeedIcon,
+    "move": MoveIcon,
+    "registry": RegistryIcon,
+}

src/animaltrack/web/templates/nav.py

@@ -0,0 +1,112 @@
+# ABOUTME: Bottom navigation component for AnimalTrack mobile UI.
+# ABOUTME: Industrial farm aesthetic with large touch targets and high contrast.
+
+from fasthtml.common import A, Div, Span, Style
+
+from animaltrack.web.templates.icons import NAV_ICONS
+
+# Navigation items configuration
+NAV_ITEMS = [
+    {"id": "egg", "label": "Egg", "href": "/"},
+    {"id": "feed", "label": "Feed", "href": "/feed"},
+    {"id": "move", "label": "Move", "href": "/move"},
+    {"id": "registry", "label": "Registry", "href": "/registry"},
+]
+
+
+def BottomNavStyles():  # noqa: N802
+    """CSS styles for bottom navigation - include in page head."""
+    return Style("""
+        /* Bottom nav industrial styling */
+        #bottom-nav {
+            box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
+        }
+
+        /* Safe area for iOS notch devices */
+        .safe-area-pb {
+            padding-bottom: env(safe-area-inset-bottom, 0);
+        }
+
+        /* Active item subtle glow effect */
+        .nav-item-active::after {
+            content: '';
+            position: absolute;
+            bottom: 0;
+            left: 50%;
+            transform: translateX(-50%);
+            width: 40%;
+            height: 2px;
+            background: linear-gradient(90deg, transparent, #b8860b, transparent);
+        }
+
+        /* Hover state for non-touch devices */
+        @media (hover: hover) {
+            #bottom-nav a:hover {
+                background-color: rgba(184, 134, 11, 0.1);
+            }
+        }
+
+        /* Ensure consistent icon rendering */
+        #bottom-nav svg {
+            flex-shrink: 0;
+        }
+
+        /* Typography for labels */
+        #bottom-nav span {
+            font-family: system-ui, -apple-system, sans-serif;
+            letter-spacing: 0.05em;
+        }
+    """)
+
+
+def BottomNav(active_id: str = "egg"):  # noqa: N802
+    """
+    Fixed bottom navigation bar for AnimalTrack.
+
+    Args:
+        active_id: Currently active nav item ('egg', 'feed', 'move', 'registry')
+
+    Returns:
+        FT component for the bottom nav
+    """
+
+    def nav_item(item):
+        is_active = item["id"] == active_id
+        icon_fn = NAV_ICONS[item["id"]]
+
+        # Active: golden highlight, inactive: muted stone gray
+        label_cls = "text-xs font-semibold tracking-wide uppercase mt-1 "
+        label_cls += "text-amber-600" if is_active else "text-stone-500"
+
+        item_cls = "flex flex-col items-center justify-center py-2 px-4 "
+        if is_active:
+            item_cls += "bg-stone-900/50 rounded-lg"
+
+        link_cls = (
+            "relative flex-1 flex items-center justify-center min-h-[64px] "
+            "transition-all duration-150 active:scale-95 "
+        )
+        if is_active:
+            link_cls += "nav-item-active"
+
+        return A(
+            Div(
+                icon_fn(active=is_active),
+                Span(item["label"], cls=label_cls),
+                cls=item_cls,
+            ),
+            href=item["href"],
+            cls=link_cls,
+        )
+
+    return Div(
+        # Top border with subtle texture effect
+        Div(cls="h-px bg-gradient-to-r from-transparent via-stone-700 to-transparent"),
+        # Nav container
+        Div(
+            *[nav_item(item) for item in NAV_ITEMS],
+            cls="flex items-stretch bg-[#1a1a18] safe-area-pb",
+        ),
+        cls="fixed bottom-0 left-0 right-0 z-50",
+        id="bottom-nav",
+    )

tests/test_config.py

@@ -81,7 +81,7 @@ class TestConfigDefaults:
             from animaltrack.config import Settings
 
             settings = Settings()
-            assert settings.metrics_enabled is False
+            assert settings.metrics_enabled is True
 
 
 class TestConfigEnvOverrides:

tests/test_web_health.py

@@ -0,0 +1,129 @@
+# ABOUTME: Tests for health and metrics endpoints.
+# ABOUTME: Covers /healthz DB check and /metrics Prometheus format.
+
+import os
+from unittest.mock import MagicMock
+
+import pytest
+
+
+def make_test_settings(
+    csrf_secret: str = "test-secret",
+    trusted_proxy_ips: str = "127.0.0.1",
+    metrics_enabled: bool = True,
+):
+    """Create Settings for testing by setting env vars temporarily."""
+    from animaltrack.config import Settings
+
+    old_env = os.environ.copy()
+    try:
+        os.environ["CSRF_SECRET"] = csrf_secret
+        os.environ["TRUSTED_PROXY_IPS"] = trusted_proxy_ips
+        os.environ["METRICS_ENABLED"] = str(metrics_enabled).lower()
+        return Settings()
+    finally:
+        os.environ.clear()
+        os.environ.update(old_env)
+
+
+class TestHealthzEndpoint:
+    """Tests for /healthz endpoint."""
+
+    @pytest.fixture
+    def client(self, seeded_db):
+        """Create a test client for the app."""
+        from starlette.testclient import TestClient
+
+        from animaltrack.web.app import create_app
+
+        settings = make_test_settings(trusted_proxy_ips="testclient")
+        app, rt = create_app(settings=settings, db=seeded_db)
+        return TestClient(app, raise_server_exceptions=False)
+
+    def test_healthz_returns_200_when_db_healthy(self, client):
+        """GET /healthz returns 200 OK when database is healthy."""
+        resp = client.get("/healthz")
+        assert resp.status_code == 200
+        assert resp.text == "OK"
+
+    def test_healthz_returns_503_when_db_fails(self, seeded_db):
+        """GET /healthz returns 503 when database query fails."""
+        from starlette.testclient import TestClient
+
+        from animaltrack.web.app import create_app
+
+        # Create a mock db that raises on execute
+        mock_db = MagicMock()
+        mock_db.execute.side_effect = Exception("Database connection lost")
+
+        settings = make_test_settings(trusted_proxy_ips="testclient")
+        app, rt = create_app(settings=settings, db=mock_db)
+        client = TestClient(app, raise_server_exceptions=False)
+
+        resp = client.get("/healthz")
+        assert resp.status_code == 503
+        assert "Database error" in resp.text
+
+
+class TestMetricsEndpoint:
+    """Tests for /metrics Prometheus endpoint."""
+
+    @pytest.fixture
+    def client_metrics_enabled(self, seeded_db):
+        """Create a test client with metrics enabled."""
+        from starlette.testclient import TestClient
+
+        from animaltrack.web.app import create_app
+
+        settings = make_test_settings(
+            trusted_proxy_ips="testclient",
+            metrics_enabled=True,
+        )
+        app, rt = create_app(settings=settings, db=seeded_db)
+        return TestClient(app, raise_server_exceptions=False)
+
+    @pytest.fixture
+    def client_metrics_disabled(self, seeded_db):
+        """Create a test client with metrics disabled."""
+        from starlette.testclient import TestClient
+
+        from animaltrack.web.app import create_app
+
+        settings = make_test_settings(
+            trusted_proxy_ips="testclient",
+            metrics_enabled=False,
+        )
+        app, rt = create_app(settings=settings, db=seeded_db)
+        return TestClient(app, raise_server_exceptions=False)
+
+    def test_metrics_returns_200_when_enabled(self, client_metrics_enabled):
+        """GET /metrics returns 200 when metrics_enabled=True."""
+        resp = client_metrics_enabled.get("/metrics")
+        assert resp.status_code == 200
+
+    def test_metrics_returns_404_when_disabled(self, client_metrics_disabled):
+        """GET /metrics returns 404 when metrics_enabled=False."""
+        resp = client_metrics_disabled.get("/metrics")
+        assert resp.status_code == 404
+
+    def test_metrics_returns_prometheus_format(self, client_metrics_enabled):
+        """GET /metrics returns valid Prometheus text format."""
+        resp = client_metrics_enabled.get("/metrics")
+
+        # Check Content-Type
+        content_type = resp.headers.get("content-type", "")
+        assert "text/plain" in content_type
+
+        # Check body contains Prometheus format elements
+        body = resp.text
+        assert "# HELP" in body
+        assert "# TYPE" in body
+        assert "animaltrack_up" in body
+
+    def test_metrics_includes_db_health_metric(self, client_metrics_enabled):
+        """GET /metrics includes database health gauge."""
+        resp = client_metrics_enabled.get("/metrics")
+        body = resp.text
+
+        assert "animaltrack_db_healthy" in body
+        assert "# TYPE animaltrack_db_healthy gauge" in body

tests/test_web_static.py

@@ -0,0 +1,85 @@
+# ABOUTME: Tests for static file serving with cache headers.
+# ABOUTME: Verifies /static/v1/ path and immutable cache-control.
+
+import os
+
+import pytest
+
+
+def make_test_settings(
+    csrf_secret: str = "test-secret",
+    trusted_proxy_ips: str = "127.0.0.1",
+):
+    """Create Settings for testing by setting env vars temporarily."""
+    from animaltrack.config import Settings
+
+    old_env = os.environ.copy()
+    try:
+        os.environ["CSRF_SECRET"] = csrf_secret
+        os.environ["TRUSTED_PROXY_IPS"] = trusted_proxy_ips
+        return Settings()
+    finally:
+        os.environ.clear()
+        os.environ.update(old_env)
+
+
+class TestStaticFileServing:
+    """Tests for static file serving."""
+
+    @pytest.fixture
+    def static_dir(self, tmp_path):
+        """Create a temporary static directory with test files."""
+        static_v1 = tmp_path / "static" / "v1"
+        static_v1.mkdir(parents=True)
+
+        # Create a test CSS file
+        test_css = static_v1 / "test.css"
+        test_css.write_text("body { color: red; }")
+
+        # Create a test JS file
+        test_js = static_v1 / "test.js"
+        test_js.write_text("console.log('test');")
+
+        return tmp_path / "static"
+
+    @pytest.fixture
+    def client(self, seeded_db, static_dir):
+        """Create a test client with static file serving configured."""
+        from starlette.testclient import TestClient
+
+        from animaltrack.web.app import create_app
+
+        settings = make_test_settings(trusted_proxy_ips="testclient")
+        app, rt = create_app(
+            settings=settings,
+            db=seeded_db,
+            static_dir=static_dir,
+        )
+        return TestClient(app, raise_server_exceptions=False)
+
+    def test_static_files_are_served(self, client):
+        """Static files under /static/v1/ are accessible."""
+        resp = client.get("/static/v1/test.css")
+        assert resp.status_code == 200
+        assert "body { color: red; }" in resp.text
+
+    def test_static_files_have_immutable_cache_headers(self, client):
+        """Static files have Cache-Control: immutable header."""
+        resp = client.get("/static/v1/test.css")
+        assert resp.status_code == 200
+
+        cache_control = resp.headers.get("cache-control", "")
+        assert "immutable" in cache_control
+        assert "max-age=31536000" in cache_control
+        assert "public" in cache_control
+
+    def test_static_js_files_served(self, client):
+        """JavaScript files are served correctly."""
+        resp = client.get("/static/v1/test.js")
+        assert resp.status_code == 200
+        assert "console.log" in resp.text
+
+    def test_static_404_for_missing_files(self, client):
+        """Missing static files return 404."""
+        resp = client.get("/static/v1/nonexistent.css")
+        assert resp.status_code == 404