feat(监控): 完善系统监控、登录状态与访问审计能力

backend/tests/test_user_login_sessions.py

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+from datetime import datetime, timedelta, timezone
+import uuid
+
+import pytest
+
+from app.core.config import settings
+from app.models.user import User, UserStatus
+from app.models.user_login_session import UserLoginSession
+from app.services.user_login_sessions import get_login_summaries, session_id_from_payload
+
+
+def test_legacy_session_id_is_stable_without_storing_a_token():
+    payload = {"sub": "00000000-0000-0000-0000-000000000101", "orig_iat": 1_700_000_000, "client_type": "web"}
+
+    first = session_id_from_payload(payload)
+    second = session_id_from_payload(payload)
+
+    assert first == second
+    assert isinstance(first, uuid.UUID)
+
+
+@pytest.mark.asyncio
+async def test_login_summary_marks_recent_unended_sessions_online(db_session, monkeypatch):
+    now = datetime.now(timezone.utc)
+    monkeypatch.setattr(settings, "USER_SESSION_ONLINE_SECONDS", 300)
+    user = User(
+        id=uuid.uuid4(),
+        email="login-summary@example.com",
+        password_hash="hash",
+        full_name="Login Summary",
+        clinical_department="IT",
+        status=UserStatus.ACTIVE,
+    )
+    db_session.add(user)
+    db_session.add_all(
+        [
+            UserLoginSession(
+                id=uuid.uuid4(),
+                user_id=user.id,
+                client_type="desktop",
+                login_at=now - timedelta(minutes=10),
+                last_seen_at=now - timedelta(seconds=20),
+            ),
+            UserLoginSession(
+                id=uuid.uuid4(),
+                user_id=user.id,
+                client_type="web",
+                login_at=now - timedelta(days=1),
+                last_seen_at=now - timedelta(days=1),
+                ended_at=now - timedelta(days=1),
+                end_reason="logout",
+            ),
+        ]
+    )
+    await db_session.commit()
+
+    summaries = await get_login_summaries(db_session, [user.id])
+
+    assert summaries[user.id].status == "ONLINE"
+    assert summaries[user.id].active_session_count == 1
+    assert summaries[user.id].client_type == "desktop"