diff --git a/src/routers/audit.py b/src/routers/audit.py
index 405c700..a8582c5 100644
--- a/src/routers/audit.py
+++ b/src/routers/audit.py
@@ -24,6 +24,7 @@ def _parse_json(s: Optional[str]):
 async def list_audit(
     action: Optional[str] = None,
     resource_type: Optional[str] = None,
+    resource_id: Optional[int] = None,
     admin_id: Optional[int] = None,
     from_ts: Optional[str] = None,
     to_ts: Optional[str] = None,
@@ -46,6 +47,9 @@ async def list_audit(
     if resource_type:
         where.append("resource_type = ?")
         params.append(resource_type)
+    if resource_id is not None:
+        where.append("resource_id = ?")
+        params.append(resource_id)
     if admin_id is not None:
         where.append("admin_id = ?")
         params.append(admin_id)
diff --git a/src/static/css/style.css b/src/static/css/style.css
index aa4876d..c9047ac 100644
--- a/src/static/css/style.css
+++ b/src/static/css/style.css
@@ -872,3 +872,65 @@ input[type="date"].filter-select { padding: 6px 10px; }
 .health-badge-ok      { background: rgba(16, 185, 129, 0.15); color: #10b981; }
 .health-badge-unknown { background: rgba(148, 163, 184, 0.15); color: #94a3b8; }
 
+/* === Audit-Spur (Phase 5) === */
+.modal.modal-large {
+    max-width: 720px;
+}
+.audit-content {
+    max-height: 60vh;
+    overflow-y: auto;
+}
+.audit-entry {
+    border: 1px solid rgba(255, 255, 255, 0.08);
+    border-radius: 8px;
+    padding: 10px 12px;
+    margin-bottom: 8px;
+    background: rgba(255, 255, 255, 0.02);
+}
+.audit-entry-head {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    flex-wrap: wrap;
+    font-size: 13px;
+}
+.audit-entry-action {
+    display: inline-block;
+    padding: 2px 8px;
+    border-radius: 10px;
+    font-size: 11px;
+    font-weight: 600;
+    text-transform: uppercase;
+    letter-spacing: 0.5px;
+}
+.audit-action-create        { background: rgba(16, 185, 129, 0.2); color: #10b981; }
+.audit-action-update        { background: rgba(59, 130, 246, 0.2); color: #3b82f6; }
+.audit-action-delete        { background: rgba(239, 68, 68, 0.2); color: #ef4444; }
+.audit-action-login_success { background: rgba(16, 185, 129, 0.15); color: #10b981; }
+.audit-action-login_failed  { background: rgba(245, 158, 11, 0.15); color: #f59e0b; }
+.audit-action-login_blocked { background: rgba(239, 68, 68, 0.2); color: #ef4444; }
+.audit-entry-meta {
+    color: #94a3b8;
+    font-size: 12px;
+}
+.audit-entry-detail {
+    margin-top: 8px;
+}
+.audit-entry-detail summary {
+    cursor: pointer;
+    font-size: 12px;
+    color: #94a3b8;
+    user-select: none;
+}
+.audit-entry-detail pre {
+    margin: 6px 0 0 0;
+    padding: 8px 10px;
+    background: rgba(0, 0, 0, 0.3);
+    border-radius: 4px;
+    font-size: 11px;
+    line-height: 1.4;
+    overflow-x: auto;
+    color: #e2e8f0;
+    max-height: 240px;
+}
+
diff --git a/src/static/dashboard.html b/src/static/dashboard.html
index 229c5be..6e6cb35 100644
--- a/src/static/dashboard.html
+++ b/src/static/dashboard.html
@@ -642,6 +642,20 @@
     </div>
   </div>
 
+  
+  <!-- Modal: Audit-Spur einer Ressource (Phase 5) -->
+  <div class="modal-overlay" id="modalAudit">
+    <div class="modal modal-large">
+      <div class="modal-header">
+        <h3 id="auditTitle">Audit-Spur</h3>
+        <button class="modal-close" onclick="closeModal('modalAudit')">&times;</button>
+      </div>
+      <div class="modal-body">
+        <div id="auditContent" class="audit-content">Lade...</div>
+      </div>
+    </div>
+  </div>
+
   <!-- Modal: Confirm -->
   <div class="modal-overlay" id="modalConfirm">
     <div class="modal" style="max-width: 400px;">
diff --git a/src/static/js/sources.js b/src/static/js/sources.js
index b4f0770..f4441d9 100644
--- a/src/static/js/sources.js
+++ b/src/static/js/sources.js
@@ -63,6 +63,56 @@ async function loadGlobalSources() {
 }
 
 
+
+async function showSourceAudit(sourceId, sourceName) {
+  document.getElementById("auditTitle").textContent = `Audit-Spur: ${sourceName}`;
+  document.getElementById("auditContent").innerHTML = '<div class="text-muted">Lade...</div>';
+  openModal("modalAudit");
+  try {
+    const res = await API.get(`/api/audit-log?resource_type=source&resource_id=${sourceId}&limit=50`);
+    renderAuditEntries(res.items || []);
+  } catch (err) {
+    document.getElementById("auditContent").innerHTML =
+      `<div class="text-danger">Audit konnte nicht geladen werden: ${esc(err.message || String(err))}</div>`;
+  }
+}
+
+function renderAuditEntries(items) {
+  const c = document.getElementById("auditContent");
+  if (!items.length) {
+    c.innerHTML = '<div class="text-muted">Keine Audit-Eintr&auml;ge f&uuml;r diese Quelle.</div>';
+    return;
+  }
+  c.innerHTML = items.map(e => {
+    const meta = `${formatDateTime(e.ts)} &middot; ${esc(e.admin_username || "-")} &middot; ${esc(e.ip || "-")}`;
+    const hasDiff = (e.before && Object.keys(e.before).length) || (e.after && Object.keys(e.after).length);
+    const diffPayload = JSON.stringify({ before: e.before, after: e.after }, null, 2);
+    return `
+      <div class="audit-entry">
+        <div class="audit-entry-head">
+          <span class="audit-entry-action audit-action-${esc(e.action)}">${esc(e.action)}</span>
+          <span class="audit-entry-meta">${meta}</span>
+        </div>
+        ${hasDiff ? `<details class="audit-entry-detail">
+          <summary>Diff anzeigen</summary>
+          <pre>${esc(diffPayload)}</pre>
+        </details>` : ""}
+      </div>
+    `;
+  }).join("");
+}
+
+function formatDateTime(iso) {
+  if (!iso) return "-";
+  try {
+    const d = new Date(iso);
+    return d.toLocaleString("de-DE", {
+      day: "2-digit", month: "2-digit", year: "numeric",
+      hour: "2-digit", minute: "2-digit",
+    });
+  } catch { return iso; }
+}
+
 function renderGlobalStats(stats) {
   const bar = document.getElementById("globalStatsBar");
   if (!bar) return;
@@ -131,6 +181,7 @@ function renderGlobalSources(sources) {
         <td><span class="badge badge-${s.status === "active" ? "active" : "inactive"}">${s.status === "active" ? "Aktiv" : "Inaktiv"}</span></td>
         <td>
           <button class="btn btn-secondary btn-small" onclick="editGlobalSource(${s.id})">Bearbeiten</button>
+          <button class="btn btn-secondary btn-small" onclick="showSourceAudit(${s.id}, '${esc(s.name)}')">Audit</button>
           <button class="btn btn-danger btn-small" onclick="confirmDeleteGlobalSource(${s.id}, '${esc(s.name)}')">Löschen</button>
         </td>
       </tr>${notesRow}`;