diff --git a/migration/src/m20220101_000001_create_table.rs b/migration/src/m20220101_000001_create_table.rs
index c44ce10..18d5be3 100644
--- a/migration/src/m20220101_000001_create_table.rs
+++ b/migration/src/m20220101_000001_create_table.rs
@@ -82,7 +82,7 @@ impl MigrationTrait for Migration {
                             .not_null()
                             .default(false),
                     )
-                    .col(ColumnDef::new(Alias::new("owner_id")).uuid().not_null())
+                    .col(ColumnDef::new(Alias::new("owner_id")).uuid().null())
                     .to_owned(),
             )
             .await?;
diff --git a/src/models/group.rs b/src/models/group.rs
index cb8cf5d..00cb6f0 100644
--- a/src/models/group.rs
+++ b/src/models/group.rs
@@ -13,11 +13,6 @@ pub struct Model {
     pub name: String,
     pub is_default: bool,
     pub created_at: DateTimeUtc,
-
-    /// Permissions serveur par défaut (stockées en i64, lues en u64)
-    pub server_permissions: i64,
-    pub channel_permissions: i64,
-    pub voice_permissions: i64,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
diff --git a/src/models/group_permission.rs b/src/models/group_permission.rs
index 25ce074..97f1d0a 100644
--- a/src/models/group_permission.rs
+++ b/src/models/group_permission.rs
@@ -23,6 +23,7 @@ pub struct Model {
     pub id: Uuid,
     pub group_id: Uuid,
     pub server_id: Uuid,
+    // L'ID du scope (soit un Uuid d'une Category, soit l'Uuid d'un Channel, soit l'Uuid du Server)
     pub scope_type: PermissionScopeType,
     pub scope_id: Uuid,
     pub server_permissions: i64,
diff --git a/src/models/server.rs b/src/models/server.rs
index a993205..b5fdacc 100644
--- a/src/models/server.rs
+++ b/src/models/server.rs
@@ -14,7 +14,7 @@ pub struct Model {
     pub created_at: DateTimeUtc,
     pub updated_at: DateTimeUtc,
     pub is_default: bool,
-    pub owner_id: Uuid,
+    pub owner_id: Option<Uuid>,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
diff --git a/src/models/user_permission.rs b/src/models/user_permission.rs
index 7e9736e..47cc38f 100644
--- a/src/models/user_permission.rs
+++ b/src/models/user_permission.rs
@@ -23,6 +23,7 @@ pub struct Model {
     pub id: Uuid,
     pub user_id: Uuid,
     pub server_id: Uuid,
+    // L'ID du scope (soit un Uuid d'une Category, soit l'Uuid d'un Channel, soit l'Uuid du Server)
     pub scope_type: PermissionScopeType,
     pub scope_id: Uuid,
     pub server_permissions: i64,
diff --git a/src/routes/group/dto.rs b/src/routes/group/dto.rs
index 1ffc5ab..ad4c81a 100644
--- a/src/routes/group/dto.rs
+++ b/src/routes/group/dto.rs
@@ -10,9 +10,6 @@ pub struct CreateGroupRequest {
     pub name: String,
     #[serde(default)]
     pub is_default: bool,
-    pub server_permissions: i64,
-    pub channel_permissions: i64,
-    pub voice_permissions: i64,
 }
 
 #[derive(Debug, Serialize, Deserialize, ToSchema)]
@@ -20,9 +17,6 @@ pub struct UpdateGroupRequest {
     #[schema(example = "Modérateurs (MAJ)")]
     pub name: String,
     pub is_default: bool,
-    pub server_permissions: i64,
-    pub channel_permissions: i64,
-    pub voice_permissions: i64,
 }
 
 #[derive(Debug, Serialize, Deserialize, ToSchema)]
@@ -32,7 +26,4 @@ pub struct GroupResponse {
     pub name: String,
     pub is_default: bool,
     pub created_at: DateTime<Utc>,
-    pub server_permissions: i64,
-    pub channel_permissions: i64,
-    pub voice_permissions: i64,
 }
diff --git a/src/routes/group/mapper.rs b/src/routes/group/mapper.rs
index b2288be..6113250 100644
--- a/src/routes/group/mapper.rs
+++ b/src/routes/group/mapper.rs
@@ -10,9 +10,6 @@ pub fn group_model_to_group_response(model: group::Model) -> GroupResponse {
         name: model.name,
         is_default: model.is_default,
         created_at: model.created_at,
-        server_permissions: model.server_permissions,
-        channel_permissions: model.channel_permissions,
-        voice_permissions: model.voice_permissions,
     }
 }
 
@@ -22,9 +19,6 @@ pub fn create_request_to_am(req: CreateGroupRequest) -> group::ActiveModel {
         server_id: Set(req.server_id),
         name: Set(req.name),
         is_default: Set(req.is_default),
-        server_permissions: Set(req.server_permissions),
-        channel_permissions: Set(req.channel_permissions),
-        voice_permissions: Set(req.voice_permissions),
         ..Default::default()
     }
 }
@@ -39,9 +33,6 @@ pub fn update_request_to_am(
         server_id: Set(server_id),
         name: Set(req.name),
         is_default: Set(req.is_default),
-        server_permissions: Set(req.server_permissions),
-        channel_permissions: Set(req.channel_permissions),
-        voice_permissions: Set(req.voice_permissions),
         ..Default::default()
     }
 }