Add GET /api/logs/{name} endpoint to admin API

backend/admin.py

@@ -169,6 +169,18 @@ async def get_ollama_models(
     except Exception:
         return {"models": [], "reachable": False}
 
+@app.get("/api/logs/{name}")
+async def get_log_lines(name: str, _ = Depends(require_admin_auth)):
+    if name not in ("usage", "error"):
+        raise HTTPException(status_code=400, detail="name must be 'usage' or 'error'")
+    log_file = Path(os.getenv("LOG_FILE", "logs/usage.log"))
+    path = log_file if name == "usage" else log_file.parent / "error.log"
+    try:
+        lines = path.read_text(encoding="utf-8").splitlines()
+        return {"lines": lines[-10:]}
+    except FileNotFoundError:
+        return {"lines": []}
+
 # Statisches Frontend ausliefern (nur im Produktivbetrieb, wenn dist/ existiert)
 _dist = Path(__file__).parent.parent / "frontend" / "dist"
 if _dist.exists():

backend/tests/test_admin_logs.py

@@ -0,0 +1,59 @@
+import os
+import pytest
+from fastapi.testclient import TestClient
+
+os.environ.setdefault("ADMIN_PASSWORD", "test-admin-pw")
+os.environ.setdefault("OLLAMA_URL", "http://127.0.0.1:9999")
+
+
+@pytest.fixture
+def client(tmp_path):
+    log_file = tmp_path / "usage.log"
+    log_file.write_text("\n".join(f"Zeile {i}" for i in range(1, 16)) + "\n")
+    (tmp_path / "error.log").write_text("Fehler A\nFehler B\n")
+    os.environ["LOG_FILE"] = str(log_file)
+
+    from database import Base, engine
+    Base.metadata.drop_all(bind=engine)
+    Base.metadata.create_all(bind=engine)
+
+    from admin import app
+    yield TestClient(app, raise_server_exceptions=False)
+
+    Base.metadata.drop_all(bind=engine)
+    os.environ.pop("LOG_FILE", None)
+
+
+AUTH = {"Authorization": "Bearer test-admin-pw"}
+
+
+def test_logs_usage_returns_last_10_lines(client):
+    resp = client.get("/api/logs/usage", headers=AUTH)
+    assert resp.status_code == 200
+    lines = resp.json()["lines"]
+    assert len(lines) == 10
+    assert lines[-1] == "Zeile 15"
+    assert lines[0] == "Zeile 6"
+
+
+def test_logs_error_returns_content(client):
+    resp = client.get("/api/logs/error", headers=AUTH)
+    assert resp.status_code == 200
+    assert resp.json()["lines"] == ["Fehler A", "Fehler B"]
+
+
+def test_logs_missing_file_returns_empty(client, tmp_path):
+    os.environ["LOG_FILE"] = str(tmp_path / "nonexistent.log")
+    resp = client.get("/api/logs/usage", headers=AUTH)
+    assert resp.status_code == 200
+    assert resp.json()["lines"] == []
+
+
+def test_logs_invalid_name_returns_400(client):
+    resp = client.get("/api/logs/secret", headers=AUTH)
+    assert resp.status_code == 400
+
+
+def test_logs_requires_auth(client):
+    resp = client.get("/api/logs/usage")
+    assert resp.status_code == 401