better diagrams

docs/architecture-class-diagram.puml

@@ -1,5 +1,9 @@
 @startuml "Backend Klassendiagramm"
 
+scale 0.9
+skinparam dpi 600
+skinparam backgroundColor #FFAB40
+
 skinparam packageStyle rectangle
 skinparam classAttributeIconSize 0
 skinparam classFontSize 11
@@ -22,10 +26,12 @@ package "Controller Layer" #ADD8E6 {
         ' +confirmEvent()
         ' +rejectEvent()
         ' +getConversations()
+        ' +getConversation()
     }
 
     class EventController {
         ' +create()
+        ' +getById()
         ' +getAll()
         ' +getByDateRange()
         ' +update()
@@ -38,7 +44,7 @@ package "Controller Layer" #ADD8E6 {
 }
 
 package "Service Layer" #90EE90 {
-    package "Data Access Interfaces" {
+    package "Interfaces" {
         interface AIProvider {
             ' +processMessage()
         }
@@ -59,8 +65,10 @@ package "Service Layer" #90EE90 {
         }
 
         interface ChatRepository {
-            ' +getHistory()
-            ' +create()
+            ' +getConversationsByUser()
+            ' +createConversation()
+            ' +getMessages()
+            ' +createMessage()
         }
     }
 
@@ -76,18 +84,23 @@ package "Service Layer" #90EE90 {
         ' -aiProvider: AIProvider
         ' +processMessage()
         ' +confirmEvent()
+        ' +rejectEvent()
+        ' +getConversations()
+        ' +getConversation()
     }
 
     class EventService {
         ' -eventRepo: EventRepository
         ' +create()
+        ' +getById()
+        ' +getAll()
         ' +getByDateRange()
         ' +update()
         ' +delete()
     }
 }
 
-package "AI Layer" #FFA07A {
+package "AI Implementations" #FFA07A {
     class ClaudeAdapter implements AIProvider {
         ' -apiKey: string
         ' +processMessage()