feat: RDG session flap rule, qwinsta/logoff queue and dashboard UI (0.9.13)

Detect 302→303 within 1–10s, Problem with 30s dedup, rdg_flap flag.
Agent command poll API, admin qwinsta/logoff from Overview. Migration 016.

backend/tests/test_health.py

@@ -4,6 +4,6 @@ from app.version import APP_NAME, APP_VERSION, APP_VERSION_LABEL
 
 
 def test_version_constants():
-    assert APP_VERSION == "0.9.12"
+    assert APP_VERSION == "0.9.13"
     assert APP_NAME == "Security Alert Center"
-    assert APP_VERSION_LABEL == "Security Alert Center v.0.9.12"
+    assert APP_VERSION_LABEL == "Security Alert Center v.0.9.13"

backend/tests/test_rdg_session_flap.py

@@ -0,0 +1,158 @@
+"""Tests for RDG 302→303 session flap rule."""
+
+import uuid
+from datetime import datetime, timedelta, timezone
+
+import pytest
+
+from app.config import get_settings
+from app.models import Problem
+from app.services.ingest import ingest_event
+from app.services.problems import maybe_create_problem
+from app.services.problem_rules import RULE_RDG_SESSION_FLAP
+from app.services.rdg_session_flap import (
+    evaluate_rdg_session_flap,
+    event_has_rdg_flap,
+    find_rdg_success_before_end,
+)
+from tests.test_ingest import VALID_EVENT
+
+
+def _payload(**overrides):
+    base = {
+        **VALID_EVENT,
+        "event_id": str(uuid.uuid4()),
+        "occurred_at": datetime.now(timezone.utc).isoformat(),
+    }
+    base.update(overrides)
+    return base
+
+
+def _ingest(db, occurred_at: datetime, **overrides):
+    payload = _payload(**overrides)
+    payload["occurred_at"] = occurred_at.isoformat()
+    event, _ = ingest_event(db, payload)
+    db.flush()
+    return event
+
+
+@pytest.fixture
+def rdg_settings(monkeypatch):
+    monkeypatch.setenv("SAC_RDG_FLAP_WINDOW_MIN_SEC", "1")
+    monkeypatch.setenv("SAC_RDG_FLAP_WINDOW_MAX_SEC", "10")
+    monkeypatch.setenv("SAC_RDG_FLAP_DEDUP_SEC", "30")
+    get_settings.cache_clear()
+    yield
+    get_settings.cache_clear()
+
+
+def test_rdg_flap_detects_302_then_303(db_session, rdg_settings):
+    t0 = datetime.now(timezone.utc)
+    user = "B26\\test.user"
+    details = {"user": user, "internal_ip": "192.168.163.32"}
+
+    _ingest(
+        db_session,
+        t0,
+        type="rdg.connection.success",
+        category="auth",
+        severity="info",
+        title="RD Gateway event 302",
+        summary="302",
+        details=details,
+    )
+    end = _ingest(
+        db_session,
+        t0 + timedelta(seconds=4),
+        type="rdg.connection.disconnected",
+        category="auth",
+        severity="info",
+        title="RD Gateway event 303",
+        summary="303",
+        details=details,
+    )
+
+    match = evaluate_rdg_session_flap(db_session, end)
+    assert match is not None
+    assert match.rule_id == RULE_RDG_SESSION_FLAP
+    assert event_has_rdg_flap(end) is True
+
+    problem, created = maybe_create_problem(db_session, end)
+    assert created is True
+    assert problem.rule_id == RULE_RDG_SESSION_FLAP
+
+
+def test_rdg_flap_ignores_gap_over_10_sec(db_session, rdg_settings):
+    t0 = datetime.now(timezone.utc)
+    user = "B26\\slow.user"
+    details = {"user": user}
+
+    _ingest(
+        db_session,
+        t0,
+        type="rdg.connection.success",
+        category="auth",
+        severity="info",
+        title="302",
+        summary="302",
+        details=details,
+    )
+    end = _ingest(
+        db_session,
+        t0 + timedelta(seconds=15),
+        type="rdg.connection.disconnected",
+        category="auth",
+        severity="info",
+        title="303",
+        summary="303",
+        details=details,
+    )
+
+    assert find_rdg_success_before_end(db_session, end) is None
+    assert evaluate_rdg_session_flap(db_session, end) is None
+
+
+def test_rdg_flap_dedup_within_30_sec(db_session, rdg_settings):
+    t0 = datetime.now(timezone.utc)
+    user = "B26\\dup.user"
+    details = {"user": user}
+
+    def pair(at: datetime):
+        _ingest(
+            db_session,
+            at,
+            type="rdg.connection.success",
+            category="auth",
+            severity="info",
+            title="302",
+            summary="302",
+            details=details,
+        )
+        return _ingest(
+            db_session,
+            at + timedelta(seconds=5),
+            type="rdg.connection.disconnected",
+            category="auth",
+            severity="info",
+            title="303",
+            summary="303",
+            details=details,
+        )
+
+    end1 = pair(t0)
+    maybe_create_problem(db_session, end1)
+    db_session.flush()
+
+    end2 = pair(t0 + timedelta(seconds=10))
+    maybe_create_problem(db_session, end2)
+    db_session.flush()
+
+    from sqlalchemy import func, select
+
+    open_count = db_session.scalar(
+        select(func.count()).select_from(Problem).where(
+            Problem.rule_id == RULE_RDG_SESSION_FLAP,
+            Problem.status == "open",
+        )
+    )
+    assert open_count == 1