feat: Add Playbook Manager, Saved Searches, and Timeline View components

- Implemented PlaybookManager for creating and managing investigation playbooks with templates.
- Added SavedSearches component for managing bookmarked queries and recurring scans.
- Introduced TimelineView for visualizing forensic event timelines with zoomable charts.
- Enhanced backend processing with auto-queued jobs for dataset uploads and improved database concurrency.
- Updated frontend components for better user experience and performance optimizations.
- Documented changes in update log for future reference.

backend/tests/test_network_scale.py

@@ -0,0 +1,82 @@
+"""Scale-oriented network endpoint tests (summary/subgraph/backpressure)."""
+
+import pytest
+
+from app.config import settings
+from app.services.host_inventory import inventory_cache
+
+
+@pytest.mark.asyncio
+async def test_network_summary_from_cache(client):
+    hunt_id = "scale-hunt-summary"
+    inv = {
+        "hosts": [
+            {"id": "h1", "hostname": "H1", "ips": ["10.0.0.1"], "users": ["a"], "row_count": 50},
+            {"id": "h2", "hostname": "H2", "ips": [], "users": [], "row_count": 10},
+        ],
+        "connections": [
+            {"source": "h1", "target": "8.8.8.8", "count": 7},
+            {"source": "h1", "target": "h2", "count": 3},
+        ],
+        "stats": {"total_hosts": 2, "total_rows_scanned": 60},
+    }
+    inventory_cache.put(hunt_id, inv)
+
+    res = await client.get(f"/api/network/summary?hunt_id={hunt_id}&top_n=1")
+    assert res.status_code == 200
+    body = res.json()
+    assert body["stats"]["total_hosts"] == 2
+    assert len(body["top_hosts"]) == 1
+    assert body["top_hosts"][0]["id"] == "h1"
+
+
+@pytest.mark.asyncio
+async def test_network_subgraph_truncates(client):
+    hunt_id = "scale-hunt-subgraph"
+    inv = {
+        "hosts": [
+            {"id": f"h{i}", "hostname": f"H{i}", "ips": [], "users": [], "row_count": 100 - i}
+            for i in range(1, 8)
+        ],
+        "connections": [
+            {"source": "h1", "target": "h2", "count": 20},
+            {"source": "h1", "target": "h3", "count": 15},
+            {"source": "h2", "target": "h4", "count": 5},
+            {"source": "h3", "target": "h5", "count": 4},
+        ],
+        "stats": {"total_hosts": 7, "total_rows_scanned": 999},
+    }
+    inventory_cache.put(hunt_id, inv)
+
+    res = await client.get(f"/api/network/subgraph?hunt_id={hunt_id}&max_hosts=3&max_edges=2")
+    assert res.status_code == 200
+    body = res.json()
+    assert len(body["hosts"]) <= 3
+    assert len(body["connections"]) <= 2
+    assert body["stats"]["truncated"] is True
+
+
+@pytest.mark.asyncio
+async def test_manual_job_submit_backpressure_returns_429(client):
+    old = settings.JOB_QUEUE_MAX_BACKLOG
+    settings.JOB_QUEUE_MAX_BACKLOG = 0
+    try:
+        res = await client.post("/api/analysis/jobs/submit/triage", json={"params": {"dataset_id": "abc"}})
+        assert res.status_code == 429
+    finally:
+        settings.JOB_QUEUE_MAX_BACKLOG = old
+@pytest.mark.asyncio
+async def test_network_host_inventory_deferred_when_queue_backlogged(client):
+    hunt_id = "deferred-hunt"
+    inventory_cache.invalidate(hunt_id)
+    inventory_cache.clear_building(hunt_id)
+
+    old = settings.JOB_QUEUE_MAX_BACKLOG
+    settings.JOB_QUEUE_MAX_BACKLOG = 0
+    try:
+        res = await client.get(f"/api/network/host-inventory?hunt_id={hunt_id}")
+        assert res.status_code == 202
+        body = res.json()
+        assert body["status"] == "deferred"
+    finally:
+        settings.JOB_QUEUE_MAX_BACKLOG = old