Update docs/deliverables/2026-05-08-productbacklog/product-backlog.md

Co-authored-by: Manuel Lerchner <manuel.lerchner1111@gmail.com>

Author: florian-pesco

docs/deliverables/2026-05-08-productbacklog/product-backlog.md

@@ -3,7 +3,7 @@
 | Priority  | User Story                                                                                                                                                                          | Acceptance Criteria                                                                                                                                        |
 | --------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | 🔴 High   | As an Incident Responder, I want to have all the relevant collected context regarding an incident, so that I dont have to search around and potentially loose information and time. | - Incident detail view shows description, status, assignments, timeline, comments<br>- Newly added information is reflected immediately                    |
-| 🔴 High   | As a Incident Responder, I want to see a timeline of events for an incident so I understand what happened.                                                                          | - Timeline displays all events in chronological order<br>- Events include type (status change, comment, assignment)<br>- Each event is timestamped         |
+| 🔴 High   | As an Incident Responder, I want to see a timeline of events for an incident so I understand what happened.                                                                          | - Timeline is backed by an append-only incident event log (event-service)<br>- Timeline displays all events in chronological order<br>- Events include type (status change, comment, assignment)<br>- Each event is timestamped         |
 | 🔴 High   | As an Incident Responder, I want to view a list of incidents so I can see active problems.                                                                                          | - Dashboard shows all incidents with key fields (title, status, severity, timestamp)<br>- Empty state shown when no incidents exist                        |
 | 🔴 High   | As an Incident Responder, I want to see the status of incidents so that I understand the urgency.                                                                                   | - Each incident displays its current status<br>- Status updates are immediately visible                                                                    |
 | 🔴 High   | As an Incident Responder I want to create new incidents manually, so that incidents missed by the system don’t get lost.                                                            | - User can create incident with required fields (title, description)<br>- Validation prevents incomplete submissions<br>- Created incident appears in list |