diff --git a/backend/app/api/routes/events.py b/backend/app/api/routes/events.py
index f4ec92c..4d8c026 100644
--- a/backend/app/api/routes/events.py
+++ b/backend/app/api/routes/events.py
@@ -256,7 +256,7 @@ def read_event_teams(
         module=PermissionModule.EVENT,
         part=PermissionPart.ADMIN,
         rights=(PermissionRight.READ | PermissionRight.MANGE_TEAMS),
-    ) and ( event and (event.user_has_right(user=current_user, rights=(PermissionRight.READ | PermissionRight.MANGE_TEAMS)))):
+    ) and ( event and (event.user_has_rights(user=current_user, rights=(PermissionRight.READ | PermissionRight.MANGE_TEAMS)))):
         raise HTTPException(status_code=400, detail="Not enough permissions")
 
     # Get list
diff --git a/backend/app/core/db.py b/backend/app/core/db.py
index 365a202..2170c5c 100644
--- a/backend/app/core/db.py
+++ b/backend/app/core/db.py
@@ -14,6 +14,9 @@ from app.models.user import (
     User,
     UserCreate,
 )
+from app.models.apikey import (
+    ApiKey,
+)
 
 engine = create_engine(str(settings.SQLALCHEMY_DATABASE_URI))
 
diff --git a/backend/app/models/apikey.py b/backend/app/models/apikey.py
index ce6649d..a264b7d 100644
--- a/backend/app/models/apikey.py
+++ b/backend/app/models/apikey.py
@@ -1,4 +1,5 @@
 import random
+from typing import TYPE_CHECKING, Optional
 
 from sqlmodel import Field, Relationship, Session, select
 
@@ -7,7 +8,9 @@ from .base import (
     BaseSQLModel,
     RowId,
 )
-from .user import User
+
+if TYPE_CHECKING:
+    from .user import User
 
 # region # API Keys for access ###################################################
 
@@ -39,7 +42,7 @@ class ApiKey(mixin.RowId, ApiKeyBase, table=True):
     api_key: str = Field(unique=True, nullable=False, max_length=64)
 
     # --- back_populates links -------------------------------------------------
-    user: User | None = Relationship(back_populates="api_keys")
+    user: "User" = Relationship(back_populates="api_keys")
 
     # --- CRUD actions ---------------------------------------------------------
     @staticmethod
diff --git a/backend/app/models/event.py b/backend/app/models/event.py
index 23b030c..1a0c6b5 100644
--- a/backend/app/models/event.py
+++ b/backend/app/models/event.py
@@ -49,7 +49,6 @@ class EventBase(
     mixin.Contact,
     mixin.StartEndDate,
     mixin.IsActive,
-    mixin.Contact,
     BaseSQLModel,
 ):
     pass
@@ -72,7 +71,8 @@ class Event(mixin.RowId, EventBase, table=True):
     # --- back_populates links -------------------------------------------------
 
     # --- many-to-many links ---------------------------------------------------
-    user_links: list[EventUserLink] = Relationship(back_populates="event")
+    user_links: list["EventUserLink"] = Relationship(back_populates="event")
+    team_links: list["EventTeam"] = Relationship(back_populates="event")
 
     # --- CRUD actions ---------------------------------------------------------
     @classmethod
@@ -189,7 +189,7 @@ class EventTeam(mixin.RowId, EventTeamBase, table=True):
     )
 
     # --- back_populates links -------------------------------------------------
-    event: "Event" = Relationship(back_populates="team_links", cascade_delete=True)
+    event: "Event" = Relationship(back_populates="team_links")#, cascade_delete=True)
     # team: "ScoutingTeam" = Relationship(back_populates="event_links", cascade_delete=True)
 
     # --- CRUD actions ---------------------------------------------------------
diff --git a/backend/app/models/mixin.py b/backend/app/models/mixin.py
index 15d3212..58dd57a 100644
--- a/backend/app/models/mixin.py
+++ b/backend/app/models/mixin.py
@@ -91,3 +91,8 @@ class Canceled(BaseModel):
     canceled_reason: str | None = Field(default=None, nullable=True, max_length=1024)
 
 
+class CheckInCheckOut(BaseModel):
+    checkin_at: datetime | None = Field(default=None, nullable=True)
+    checkout_at: datetime | None = Field(default=None, nullable=True)
+
+