diff --git a/docs/eventspace-er-schema.mermaid b/docs/eventspace-er-schema.mermaid
index 3c0019e..7aab081 100644
--- a/docs/eventspace-er-schema.mermaid
+++ b/docs/eventspace-er-schema.mermaid
@@ -1,8 +1,10 @@
 erDiagram
-    User ||--o{ Event : "creates/manages"
+    User ||--o{ Event : "creates"
+    User ||--o{ EventManager : "is assigned as"
+    User ||--o{ Guest : "can be linked to"
     User {
         uuid id PK
-        string email
+        string email UK
         string password_hash
         string first_name
         string last_name
@@ -14,11 +16,28 @@ erDiagram
         json preferences
     }
 
+    EventManager }o--|| Event : "manages"
+    EventManager {
+        uuid id PK
+        uuid user_id FK
+        uuid event_id FK
+        string role
+        boolean can_edit
+        boolean can_invite
+        boolean can_manage_gifts
+        boolean can_send_updates
+        boolean can_view_analytics
+        datetime assigned_at
+        uuid assigned_by FK
+        datetime created_at
+        datetime updated_at
+    }
+
     Event ||--o{ Guest : "invites"
     Event ||--o{ GiftItem : "contains"
     Event ||--o{ EventMedia : "has"
     Event ||--o{ EventUpdate : "has"
-    Event ||--o{ EventTheme : "uses"
+    Event }o--|| EventTheme : "uses"
     Event {
         uuid id PK
         string title
@@ -53,6 +72,7 @@ erDiagram
     Guest {
         uuid id PK
         uuid event_id FK
+        uuid user_id FK "nullable"
         string name
         string email
         string phone
@@ -235,3 +255,4 @@ erDiagram
     Event ||--o{ RSVP : "receives"
     Event ||--o{ EventActivity : "logs"
     Event ||--o{ NotificationLog : "generates"
+    User ||--o{ EventManager : "has roles"