fix(06.2): audit log — add email column, remove @ prefix from handles

- Backend: add user_email to _build_filtered_query_with_handles (UserSubject join) and _audit_to_dict_with_handles; propagate through JSON viewer and CSV export including empty-result path
- Frontend: AuditLogTab adds Email column between User and Action Type; removes @ prefix from handle cell
- Test: update expected CSV header to include user_email

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/api/audit.py

@@ -69,12 +69,14 @@ def _audit_to_dict_with_handles(
     entry: AuditLog,
     user_handle: Optional[str],
     actor_handle: Optional[str],
+    user_email: Optional[str] = None,
 ) -> dict:
-    """Extended audit log serializer that includes user_handle and actor_handle.
+    """Extended audit log serializer that includes user_handle, actor_handle, and user_email.
 
     Returns the same fields as _audit_to_dict() plus:
       - user_handle: str | None  (the handle of the user who owns the entry)
       - actor_handle: str | None (the handle of the actor who performed the event)
+      - user_email: str | None   (the email of the user who owns the entry)
 
     Used by both the JSON viewer and CSV export endpoints (Pitfall 7 — both
     endpoints must use the enriched function).
@@ -86,6 +88,7 @@ def _audit_to_dict_with_handles(
         "actor_id": str(entry.actor_id) if entry.actor_id else None,
         "user_handle": user_handle or None,
         "actor_handle": actor_handle or None,
+        "user_email": user_email or None,
         "resource_id": str(entry.resource_id) if entry.resource_id else None,
         "ip_address": str(entry.ip_address) if entry.ip_address else None,
         "metadata_": entry.metadata_,
@@ -145,6 +148,7 @@ def _build_filtered_query_with_handles(
             AuditLog,
             UserSubject.handle.label("user_handle"),
             UserActor.handle.label("actor_handle"),
+            UserSubject.email.label("user_email"),
         )
         .outerjoin(UserSubject, UserSubject.id == AuditLog.user_id)
         .outerjoin(UserActor, UserActor.id == AuditLog.actor_id)
@@ -296,8 +300,8 @@ async def list_audit_log(
 
     items = []
     for row in rows:
-        entry, user_handle_val, actor_handle_val = row[0], row[1], row[2]
+        entry, user_handle_val, actor_handle_val, user_email_val = row[0], row[1], row[2], row[3]
-        items.append(_audit_to_dict_with_handles(entry, user_handle_val, actor_handle_val))
+        items.append(_audit_to_dict_with_handles(entry, user_handle_val, actor_handle_val, user_email_val))
 
     return {
         "items": items,
@@ -339,7 +343,7 @@ async def export_audit_log(
             empty_output = io.StringIO()
             fields = [
                 "id", "event_type", "user_id", "actor_id", "user_handle", "actor_handle",
-                "resource_id", "ip_address", "metadata_", "created_at",
+                "user_email", "resource_id", "ip_address", "metadata_", "created_at",
             ]
             writer = csv.DictWriter(empty_output, fieldnames=fields)
             writer.writeheader()
@@ -362,6 +366,7 @@ async def export_audit_log(
         "actor_id",
         "user_handle",
         "actor_handle",
+        "user_email",
         "resource_id",
         "ip_address",
         "metadata_",
@@ -371,8 +376,8 @@ async def export_audit_log(
     writer = csv.DictWriter(output, fieldnames=fields)
     writer.writeheader()
     for row in rows:
-        entry, user_handle_val, actor_handle_val = row[0], row[1], row[2]
+        entry, user_handle_val, actor_handle_val, user_email_val = row[0], row[1], row[2], row[3]
-        record = _audit_to_dict_with_handles(entry, user_handle_val, actor_handle_val)
+        record = _audit_to_dict_with_handles(entry, user_handle_val, actor_handle_val, user_email_val)
         record["metadata_"] = json.dumps(record["metadata_"]) if record["metadata_"] is not None else ""
         writer.writerow(record)
 

backend/tests/test_audit.py

@@ -181,7 +181,7 @@ async def test_audit_log_export_csv(async_client, admin_user, db_session):
     # Phase 6.2: CSV now includes user_handle and actor_handle columns (D-11, Pitfall 7)
     expected_header = (
         "id,event_type,user_id,actor_id,user_handle,actor_handle,"
-        "resource_id,ip_address,metadata_,created_at"
+        "user_email,resource_id,ip_address,metadata_,created_at"
     )
     assert expected_header in response.text, (
         f"CSV header line not found in response. "

frontend/src/components/admin/AuditLogTab.vue

@@ -96,6 +96,7 @@
           <tr class="bg-gray-50 border-b border-gray-200">
             <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Timestamp</th>
             <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">User</th>
+            <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Email</th>
             <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Action Type</th>
             <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">IP Address</th>
           </tr>
@@ -107,7 +108,8 @@
             class="border-b border-gray-100 hover:bg-gray-50 transition-colors"
           >
             <td class="px-4 py-3 font-mono text-xs text-gray-500">{{ formatTimestamp(entry.created_at) }}</td>
-            <td class="px-4 py-3 text-sm text-gray-700">{{ entry.user_handle ? '@' + entry.user_handle : (entry.user_id || '—') }}</td>
+            <td class="px-4 py-3 text-sm text-gray-700">{{ entry.user_handle || entry.user_id || '—' }}</td>
+            <td class="px-4 py-3 text-sm text-gray-500">{{ entry.user_email || '—' }}</td>
             <td class="px-4 py-3">
               <span
                 class="text-xs px-2 py-1 rounded-full font-medium"