Add BU reassignment from/to detail view in anomaly banner

The AnomalyBanner BU reassignment row is now clickable, expanding to show
each affected finding with its host name and the team it moved from/to
(e.g. STEAM → PIES). The backend bu-changes endpoint now supports optional
since and limit query params to scope results to the relevant sync cycle.

backend/routes/ivantiFindings.js

@@ -1433,18 +1433,40 @@ function createIvantiFindingsRouter(db, requireAuth) {
     /**
      * GET /api/ivanti/findings/bu-changes
      *
-     * Return all BU change events from ivanti_finding_bu_history.
+     * Return BU change events from ivanti_finding_bu_history.
+     * Accepts optional `since` to filter by date, or `limit` to cap the result count.
+     * If `since` is provided, returns all changes on or after that timestamp.
+     * If neither is provided, returns the most recent 200 rows (max 500).
      *
-     * @returns {Object} 200 - { changes: Array<Object> }
+     * @query {string} [since] - ISO timestamp; return changes where detected_at >= this value
+     * @query {string} [limit] - Maximum number of rows to return (default 200, max 500); ignored when `since` is provided
+     * @returns {Object} 200 - { changes: Array<{ id, finding_id, finding_title, host_name, previous_bu, new_bu, detected_at }> }
      * @returns {Object} 500 - { error: string } on database error
      */
     router.get('/bu-changes', async (req, res) => {
         try {
-            const { rows } = await pool.query(
+            const { since, limit } = req.query;
+            let rows;
+            if (since) {
+                const result = await pool.query(
                     `SELECT id, finding_id, finding_title, host_name, previous_bu, new_bu, detected_at
                      FROM ivanti_finding_bu_history
-                 ORDER BY detected_at DESC`
+                     WHERE detected_at >= $1
+                     ORDER BY detected_at DESC`,
+                    [since]
                 );
+                rows = result.rows;
+            } else {
+                const maxRows = Math.min(parseInt(limit) || 200, 500);
+                const result = await pool.query(
+                    `SELECT id, finding_id, finding_title, host_name, previous_bu, new_bu, detected_at
+                     FROM ivanti_finding_bu_history
+                     ORDER BY detected_at DESC
+                     LIMIT $1`,
+                    [maxRows]
+                );
+                rows = result.rows;
+            }
             res.json({ changes: rows });
         } catch (err) {
             console.error('[Ivanti Findings] GET /bu-changes error:', err.message);

frontend/src/components/pages/AnomalyBanner.js

@@ -2,9 +2,11 @@
 // Warning banner for the Vulnerability Triage page.
 // Fetches the latest sync anomaly summary and displays a dismissible
 // amber banner when a significant count change is detected.
+// Clicking the "BU reassignment" row expands a detail view showing
+// which specific findings moved and from/to which team.
 
-import React, { useState, useEffect } from 'react';
+import React, { useState, useEffect, useCallback } from 'react';
-import { AlertTriangle, X, ChevronDown, ChevronUp } from 'lucide-react';
+import { AlertTriangle, X, ChevronDown, ChevronUp, ArrowRight, Loader } from 'lucide-react';
 
 const API_BASE = process.env.REACT_APP_API_BASE || 'http://localhost:3001/api';
 
@@ -92,6 +94,69 @@ const DETAIL_COUNT = {
     color: '#FCD34D',
 };
 
+const BU_DETAIL_SECTION = {
+    marginTop: '0.5rem',
+    padding: '0.5rem 0.625rem',
+    background: 'rgba(251, 146, 60, 0.08)',
+    border: '1px solid rgba(251, 146, 60, 0.15)',
+    borderRadius: '0.375rem',
+    maxHeight: '200px',
+    overflowY: 'auto',
+};
+
+const BU_DETAIL_ROW = {
+    display: 'flex',
+    alignItems: 'center',
+    gap: '0.4rem',
+    padding: '0.25rem 0',
+    fontSize: '0.6rem',
+    color: '#CBD5E1',
+    borderBottom: '1px solid rgba(255,255,255,0.04)',
+};
+
+const BU_DETAIL_HOST = {
+    fontWeight: '600',
+    color: '#E2E8F0',
+    minWidth: '80px',
+    maxWidth: '140px',
+    overflow: 'hidden',
+    textOverflow: 'ellipsis',
+    whiteSpace: 'nowrap',
+};
+
+const BU_DETAIL_TEAM = {
+    fontFamily: "'JetBrains Mono', monospace",
+    fontSize: '0.58rem',
+    padding: '0.1rem 0.35rem',
+    borderRadius: '0.2rem',
+    whiteSpace: 'nowrap',
+};
+
+const BU_FROM_STYLE = {
+    ...BU_DETAIL_TEAM,
+    background: 'rgba(239, 68, 68, 0.15)',
+    color: '#FCA5A5',
+};
+
+const BU_TO_STYLE = {
+    ...BU_DETAIL_TEAM,
+    background: 'rgba(251, 146, 60, 0.15)',
+    color: '#FDBA74',
+};
+
+const BU_ARROW_STYLE = {
+    width: '10px',
+    height: '10px',
+    color: '#64748B',
+    flexShrink: 0,
+};
+
+const BU_CLICKABLE_ROW = {
+    cursor: 'pointer',
+    borderRadius: '0.2rem',
+    transition: 'background 0.15s',
+};
+
 // ---------------------------------------------------------------------------
 // Classification labels for display
 // ---------------------------------------------------------------------------
@@ -128,6 +193,19 @@ function buildSummaryText(anomaly) {
     return `${count} findings archived — ${breakdown}`;
 }
 
+// ---------------------------------------------------------------------------
+// Shorten BU names for compact display (e.g. NTS-AEO-STEAM → STEAM)
+// ---------------------------------------------------------------------------
+function shortenBU(bu) {
+    if (!bu) return '?';
+    // Strip common prefixes for compact display
+    return bu
+        .replace(/^NTS-AEO-/, '')
+        .replace(/^SDIT-CSD-ITLS-/, '')
+        .replace(/^SDIT-CSD-/, '')
+        .replace(/^NTS-/, '');
+}
+
 // ---------------------------------------------------------------------------
 // Main component
 // ---------------------------------------------------------------------------
@@ -136,6 +214,9 @@ export default function AnomalyBanner() {
     const [loading, setLoading]     = useState(true);
     const [dismissed, setDismissed] = useState(false);
     const [expanded, setExpanded]   = useState(false);
+    const [buChanges, setBuChanges] = useState(null);
+    const [buLoading, setBuLoading] = useState(false);
+    const [buExpanded, setBuExpanded] = useState(false);
 
     useEffect(() => {
         let cancelled = false;
@@ -156,6 +237,35 @@ export default function AnomalyBanner() {
         return () => { cancelled = true; };
     }, []);
 
+    // Fetch BU change details when user expands the reassignment section
+    const loadBuChanges = useCallback(async () => {
+        if (buChanges !== null) {
+            // Already loaded — just toggle visibility
+            setBuExpanded(e => !e);
+            return;
+        }
+        setBuLoading(true);
+        setBuExpanded(true);
+        try {
+            // Scope to changes detected since this anomaly's sync
+            const since = anomaly?.sync_timestamp || '';
+            const url = since
+                ? `${API_BASE}/ivanti/findings/bu-changes?since=${encodeURIComponent(since)}`
+                : `${API_BASE}/ivanti/findings/bu-changes?limit=50`;
+            const res = await fetch(url, { credentials: 'include' });
+            if (res.ok) {
+                const data = await res.json();
+                setBuChanges(data.changes || []);
+            } else {
+                setBuChanges([]);
+            }
+        } catch {
+            setBuChanges([]);
+        } finally {
+            setBuLoading(false);
+        }
+    }, [anomaly, buChanges]);
+
     // Render nothing while loading, if dismissed, or if anomaly is not significant
     if (loading || dismissed || !anomaly || !anomaly.is_significant) {
         return null;
@@ -198,6 +308,45 @@ export default function AnomalyBanner() {
                     {Object.entries(CLASSIFICATION_LABELS).map(([key, label]) => {
                         const val = classification[key] || 0;
                         if (val === 0) return null;
+                        // BU reassignment row is clickable to show from/to details
+                        if (key === 'bu_reassignment') {
+                            return (
+                                <div key={key}>
+                                    <div
+                                        style={{ ...DETAIL_ROW, ...BU_CLICKABLE_ROW }}
+                                        onClick={loadBuChanges}
+                                        title="Click to see which findings moved and where"
+                                    >
+                                        <span style={{ display: 'flex', alignItems: 'center', gap: '0.3rem' }}>
+                                            {label}
+                                            {buLoading && <Loader style={{ width: '10px', height: '10px', animation: 'spin 1s linear infinite' }} />}
+                                            {!buLoading && (buExpanded
+                                                ? <ChevronUp style={{ width: '10px', height: '10px', opacity: 0.5 }} />
+                                                : <ChevronDown style={{ width: '10px', height: '10px', opacity: 0.5 }} />
+                                            )}
+                                        </span>
+                                        <span style={DETAIL_COUNT}>{val}</span>
+                                    </div>
+                                    {buExpanded && buChanges !== null && buChanges.length > 0 && (
+                                        <div style={BU_DETAIL_SECTION}>
+                                            {buChanges.map((change, idx) => (
+                                                <div key={change.id || idx} style={BU_DETAIL_ROW} title={change.finding_title || ''}>
+                                                    <span style={BU_DETAIL_HOST}>{change.host_name || change.finding_id}</span>
+                                                    <span style={BU_FROM_STYLE}>{shortenBU(change.previous_bu)}</span>
+                                                    <ArrowRight style={BU_ARROW_STYLE} />
+                                                    <span style={BU_TO_STYLE}>{shortenBU(change.new_bu)}</span>
+                                                </div>
+                                            ))}
+                                        </div>
+                                    )}
+                                    {buExpanded && buChanges !== null && buChanges.length === 0 && (
+                                        <div style={{ ...BU_DETAIL_SECTION, color: '#64748B', fontSize: '0.6rem', textAlign: 'center', padding: '0.5rem' }}>
+                                            No detailed BU change records found for this sync
+                                        </div>
+                                    )}
+                                </div>
+                            );
+                        }
                         return (
                             <div key={key} style={DETAIL_ROW}>
                                 <span>{label}</span>