diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 5b3039c..2dfd088 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -37,4 +37,4 @@ jobs:
         run: ruff check .
 
       - name: Run Pytest
-        run: pytest -s
+        run: pytest
diff --git a/src/app/main.py b/src/app/main.py
index 4ba6d20..9d14eb1 100644
--- a/src/app/main.py
+++ b/src/app/main.py
@@ -103,5 +103,9 @@ if __name__ == "__main__":
     import uvicorn
 
     uvicorn.run(
-        "src.app.main:app", host="0.0.0.0", port=8000, reload=True, log_level="info"
+        app="src.app.main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True,
+        log_level="info",
     )
diff --git a/src/app/routers/health.py b/src/app/routers/health.py
index a2d4175..3c1a1c4 100644
--- a/src/app/routers/health.py
+++ b/src/app/routers/health.py
@@ -1,5 +1,8 @@
 from fastapi import APIRouter
 from src.app.config import settings
+from src.services.chroma_store import ChromaStore
+from src.services.embeddings import EmbeddingService
+from datetime import datetime, timezone
 
 router = APIRouter(tags=["health"])
 
@@ -7,9 +10,6 @@ router = APIRouter(tags=["health"])
 @router.get("/healthz")
 async def health_check():
     try:
-        from src.services.chroma_store import ChromaStore
-        from src.services.embeddings import EmbeddingService
-
         chroma_store = ChromaStore()
         doc_count = chroma_store.get_count()
 
@@ -45,9 +45,7 @@ async def health_check():
             },
         }
 
-        import datetime
-
-        health_status["timestamp"] = datetime.datetime.utcnow().isoformat() + "Z"
+        health_status["timestamp"] = datetime.now(timezone.utc)
 
         if doc_count == 0:
             health_status["status"] = "degraded"
@@ -67,8 +65,6 @@ async def health_check():
 @router.get("/readiness")
 async def readiness_check():
     try:
-        from src.services.chroma_store import ChromaStore
-
         chroma_store = ChromaStore()
         doc_count = chroma_store.get_count()
 
diff --git a/src/app/routers/ingest.py b/src/app/routers/ingest.py
index 5404782..af1ff68 100644
--- a/src/app/routers/ingest.py
+++ b/src/app/routers/ingest.py
@@ -3,6 +3,8 @@ from fastapi import APIRouter, HTTPException, Depends, Header
 from typing import Optional
 
 from src.app.config import settings
+from src.ingest.ingest_cli import run_ingest
+from src.services.chroma_store import ChromaStore
 
 router = APIRouter(prefix="/api/v1/admin", tags=["administration"])
 
@@ -24,8 +26,6 @@ def verify_admin_token(authorization: Optional[str] = Header(None)):
 @router.post("/ingest")
 async def trigger_ingest(recreate: bool = False, _: bool = Depends(verify_admin_token)):
     try:
-        from src.ingest.ingest_cli import run_ingest
-
         data_dir = "articles_konsol_pro"
         platform_file = "data/platform_overview.md"
         persist_dir = settings.chroma_persist_dir
@@ -61,8 +61,6 @@ async def trigger_ingest(recreate: bool = False, _: bool = Depends(verify_admin_
 @router.get("/knowledge-base/stats")
 async def get_knowledge_base_stats(_: bool = Depends(verify_admin_token)):
     try:
-        from src.services.chroma_store import ChromaStore
-
         chroma_store = ChromaStore()
         doc_count = chroma_store.get_count()
 
@@ -91,8 +89,6 @@ async def get_knowledge_base_stats(_: bool = Depends(verify_admin_token)):
 @router.delete("/knowledge-base")
 async def clear_knowledge_base(_: bool = Depends(verify_admin_token)):
     try:
-        from src.services.chroma_store import ChromaStore
-
         chroma_store = ChromaStore()
         chroma_store.delete_collection()
 
diff --git a/src/tests/test_api.py b/src/tests/test_api.py
index deae14b..a458105 100644
--- a/src/tests/test_api.py
+++ b/src/tests/test_api.py
@@ -1,3 +1,4 @@
+from unittest.mock import patch
 from fastapi.testclient import TestClient
 import sys
 import os
@@ -7,11 +8,13 @@ sys.path.append(
 )
 
 from src.app.main import app
+from src.app.config import settings
 
 client = TestClient(app)
 
 
-def test_health_endpoint():
+@patch("src.app.routers.health.EmbeddingService")
+def test_health_endpoint(mock_embedding_service):
     response = client.get("/healthz")
     assert response.status_code == 200
     data = response.json()
@@ -107,8 +110,6 @@ def test_admin_endpoints_without_auth():
 
 
 def test_admin_endpoints_with_auth():
-    from src.app.config import settings
-
     headers = {"Authorization": f"Bearer {settings.api_secret_key}"}
 
     response = client.get("/api/v1/admin/knowledge-base/stats", headers=headers)