diff --git a/backend/app/api/auth.py b/backend/app/api/auth.py
index 9061d68..bb0fc42 100644
--- a/backend/app/api/auth.py
+++ b/backend/app/api/auth.py
@@ -1,10 +1,11 @@
 """Auth API router: login, register, refresh, logout, MFA, password change."""
 
-from fastapi import APIRouter, Depends
+from fastapi import APIRouter, Depends, Request
 from sqlalchemy.orm import Session
 
 from app.core.dependencies import get_current_user
 from app.database import get_db
+from app.services.audit_service import log_action
 from app.models.user import User
 from app.schemas.auth import (
     ChangePasswordRequest,
@@ -36,10 +37,19 @@ router = APIRouter()
 
 
 @router.post("/login", response_model=TokenResponse)
-def login(data: LoginRequest, db: Session = Depends(get_db)):
+def login(data: LoginRequest, request: Request, db: Session = Depends(get_db)):
     """Authenticate with email/password (+ optional MFA) and receive tokens."""
     user = authenticate_user(db, data.email, data.password, data.mfa_code)
     access, refresh = create_tokens(db, user)
+    log_action(
+        db,
+        user_id=user.id,
+        action="login",
+        entity_type="user",
+        entity_id=user.id,
+        ip_address=request.client.host if request.client else None,
+        user_agent=request.headers.get("user-agent"),
+    )
     return TokenResponse(
         access_token=access,
         refresh_token=refresh,
@@ -79,11 +89,21 @@ def refresh(data: RefreshRequest, db: Session = Depends(get_db)):
 @router.post("/logout")
 def logout(
     data: RefreshRequest,
+    request: Request,
     db: Session = Depends(get_db),
     current_user: User = Depends(get_current_user),
 ):
     """Revoke the supplied refresh token (logout)."""
     revoke_refresh_token(db, data.refresh_token)
+    log_action(
+        db,
+        user_id=current_user.id,
+        action="logout",
+        entity_type="user",
+        entity_id=current_user.id,
+        ip_address=request.client.host if request.client else None,
+        user_agent=request.headers.get("user-agent"),
+    )
     return {"detail": "Logged out"}
 
 
diff --git a/backend/app/api/import_router.py b/backend/app/api/import_router.py
index ff52ee3..2ab5105 100644
--- a/backend/app/api/import_router.py
+++ b/backend/app/api/import_router.py
@@ -14,6 +14,7 @@ from app.database import get_db
 from app.models.audit import ImportLog
 from app.models.user import User
 from app.schemas.import_schemas import ImportPreview, ImportResult
+from app.services.audit_service import log_action
 from app.services.csv_parser import parse_csv
 from app.services.icd_service import import_icd_from_xlsx
 from app.services.import_service import confirm_import, preview_import
@@ -140,7 +141,20 @@ async def confirm_csv_import(
             detail=f"CSV parsing failed: {exc}",
         )
 
-    return confirm_import(db, parsed, file.filename, user.id)
+    result = confirm_import(db, parsed, file.filename, user.id)
+    log_action(
+        db,
+        user_id=user.id,
+        action="csv_imported",
+        entity_type="import",
+        new_values={
+            "filename": file.filename,
+            "imported": result.imported,
+            "skipped": result.skipped,
+            "updated": result.updated,
+        },
+    )
+    return result
 
 
 # ---------------------------------------------------------------------------
@@ -194,6 +208,18 @@ async def upload_icd_xlsx(
     db.add(log)
     db.commit()
 
+    log_action(
+        db,
+        user_id=user.id,
+        action="icd_xlsx_imported",
+        entity_type="import",
+        new_values={
+            "filename": file.filename,
+            "updated": result["updated"],
+            "errors": len(result["errors"]),
+        },
+    )
+
     return ICDImportResponse(**result)
 
 
diff --git a/backend/app/api/reports.py b/backend/app/api/reports.py
index 523a06b..847fcd8 100644
--- a/backend/app/api/reports.py
+++ b/backend/app/api/reports.py
@@ -18,6 +18,7 @@ from app.schemas.report import (
     ReportListResponse,
     ReportMeta,
 )
+from app.services.audit_service import log_action
 
 logger = logging.getLogger(__name__)
 
@@ -144,6 +145,15 @@ def generate_report(
         db.commit()
         db.refresh(report)
 
+        log_action(
+            db,
+            user_id=user.id,
+            action="report_generated",
+            entity_type="report",
+            entity_id=report.id,
+            new_values={"jahr": jahr, "kw": kw, "filename": filename},
+        )
+
         return ReportMeta.model_validate(report)
     except ImportError as exc:
         raise HTTPException(501, f"Required service not yet available: {exc}")