fix: correct test imports and health endpoint assertions

- Fix import in test_db_utils.py: use app.models instead of backend.app.models
- Update health endpoint test to expect 'ok' status and infrastructure keys
- Add CHANGELOG entries for PyPI proxy performance improvements

CHANGELOG.md

@@ -7,6 +7,23 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 ### Added
+- Added HTTP connection pooling infrastructure for improved PyPI proxy performance
+  - `HttpClientManager` with configurable pool size, timeouts, and thread pool executor
+  - Eliminates per-request connection overhead (~100-500ms → ~5ms)
+- Added Redis caching layer with category-aware TTL for hermetic builds
+  - `CacheService` with graceful fallback when Redis unavailable
+  - Immutable data (artifact metadata, dependencies) cached forever
+  - Mutable data (package index, versions) uses configurable TTL
+- Added `ArtifactRepository` for batch database operations
+  - `batch_upsert_dependencies()` reduces N+1 queries to single INSERT
+  - `get_or_create_artifact()` uses atomic ON CONFLICT upsert
+- Added infrastructure status to health endpoint (`/health`)
+  - Reports HTTP pool size and worker threads
+  - Reports Redis cache connection status
+- Added new configuration settings for HTTP client, Redis, and cache TTL
+  - `ORCHARD_HTTP_MAX_CONNECTIONS`, `ORCHARD_HTTP_CONNECT_TIMEOUT`, etc.
+  - `ORCHARD_REDIS_HOST`, `ORCHARD_REDIS_PORT`, `ORCHARD_REDIS_ENABLED`
+  - `ORCHARD_CACHE_TTL_INDEX`, `ORCHARD_CACHE_TTL_VERSIONS`, etc.
 - Added transparent PyPI proxy implementing PEP 503 Simple API (#108)
   - `GET /pypi/simple/` - package index (proxied from upstream)
   - `GET /pypi/simple/{package}/` - version list with rewritten download links
@@ -16,6 +33,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Added `POST /api/v1/cache/resolve` endpoint to cache packages by coordinates instead of URL (#108)
 
 ### Changed
+- PyPI proxy now uses shared HTTP connection pool instead of per-request clients
+- PyPI proxy now caches upstream source configuration in Redis
+- Dependency storage now uses batch INSERT instead of individual queries
+- Increased default database pool size from 5 to 20 connections
+- Increased default database max overflow from 10 to 30 connections
+- Enabled Redis in Helm chart values for dev, stage, and prod environments
 - Upstream sources table text is now centered under column headers (#108)
 - ENV badge now appears inline with source name instead of separate column (#108)
 - Test and Edit buttons now have more prominent button styling (#108)

backend/tests/integration/test_pypi_proxy.py

@@ -147,6 +147,7 @@ class TestPyPIProxyInfrastructure:
         assert response.status_code == 200
 
         data = response.json()
-        assert data["status"] == "healthy"
+        assert data["status"] == "ok"
-        # Infrastructure status may include these if implemented
+        # Infrastructure status should be present
-        # assert "infrastructure" in data
+        assert "http_pool" in data
+        assert "cache" in data

backend/tests/unit/test_db_utils.py

@@ -8,7 +8,7 @@ class TestArtifactRepository:
 
     def test_batch_dependency_values_formatting(self):
         """batch_upsert_dependencies should format values correctly."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         deps = [
             ("_pypi", "numpy", ">=1.21.0"),
@@ -29,7 +29,7 @@ class TestArtifactRepository:
 
     def test_empty_dependencies_returns_empty_list(self):
         """Empty dependency list should return empty values."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         values = ArtifactRepository._format_dependency_values("abc123", [])
 
@@ -37,7 +37,7 @@ class TestArtifactRepository:
 
     def test_format_dependency_values_preserves_special_characters(self):
         """Version constraints with special characters should be preserved."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         deps = [
             ("_pypi", "package-name", ">=1.0.0,<2.0.0"),
@@ -51,7 +51,7 @@ class TestArtifactRepository:
 
     def test_batch_upsert_dependencies_returns_zero_for_empty(self):
         """batch_upsert_dependencies should return 0 for empty list without DB call."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         repo = ArtifactRepository(mock_db)
@@ -64,8 +64,8 @@ class TestArtifactRepository:
 
     def test_get_or_create_artifact_builds_correct_statement(self):
         """get_or_create_artifact should use ON CONFLICT DO UPDATE."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
-        from backend.app.models import Artifact
+        from app.models import Artifact
 
         mock_db = MagicMock()
         mock_result = MagicMock()
@@ -88,7 +88,7 @@ class TestArtifactRepository:
 
     def test_get_or_create_artifact_existing_not_created(self):
         """get_or_create_artifact should return created=False for existing artifact."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         mock_result = MagicMock()
@@ -108,7 +108,7 @@ class TestArtifactRepository:
 
     def test_get_cached_url_with_artifact_returns_tuple(self):
         """get_cached_url_with_artifact should return (CachedUrl, Artifact) tuple."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         mock_cached_url = MagicMock()
@@ -125,7 +125,7 @@ class TestArtifactRepository:
 
     def test_get_cached_url_with_artifact_returns_none_when_not_found(self):
         """get_cached_url_with_artifact should return None when URL not cached."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         mock_db.query.return_value.join.return_value.filter.return_value.first.return_value = None
@@ -137,7 +137,7 @@ class TestArtifactRepository:
 
     def test_get_artifact_dependencies_returns_list(self):
         """get_artifact_dependencies should return list of dependencies."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         mock_dep1 = MagicMock()
@@ -156,7 +156,7 @@ class TestArtifactRepository:
 
     def test_get_artifact_dependencies_returns_empty_list(self):
         """get_artifact_dependencies should return empty list when no dependencies."""
-        from backend.app.db_utils import ArtifactRepository
+        from app.db_utils import ArtifactRepository
 
         mock_db = MagicMock()
         mock_db.query.return_value.filter.return_value.all.return_value = []