diff --git a/src/inventory_wars/models.py b/src/inventory_wars/models.py
index d385b55..829fbf3 100644
--- a/src/inventory_wars/models.py
+++ b/src/inventory_wars/models.py
@@ -2,9 +2,9 @@ from __future__ import annotations
 
 from datetime import datetime
 
-from sqlalchemy import DateTime, ForeignKey, UniqueConstraint, BLOB
-
+from sqlalchemy import DateTime, ForeignKey, BLOB
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
+from sqlalchemy.sql import func
 
 __all__ = (
     "Base",
@@ -23,6 +23,7 @@ class User(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True)
     username: Mapped[str]
+    score: Mapped[int] = mapped_column(default=0, server_default="0")
 
     shares: Mapped[set[ItemShare]] = relationship(back_populates="user")
 
@@ -32,7 +33,8 @@ class Event(Base):
 
     id: Mapped[int] = mapped_column(primary_key=True, autoincrement=True)
     item_id: Mapped[int]
-    timestamp: Mapped[datetime] = mapped_column(DateTime(timezone=False))
+    start_at: Mapped[datetime] = mapped_column(DateTime(timezone=False), server_default=func.now())
+    end_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=False))
 
     shares: Mapped[set[ItemShare]] = relationship(back_populates="event")
 
@@ -42,9 +44,11 @@ class ItemShare(Base):
 
     timestamp: Mapped[datetime] = mapped_column(DateTime(timezone=False), primary_key=True)
     user_id: Mapped[int] = mapped_column(ForeignKey("user.id"))
-    event_id: Mapped[int] = mapped_column(ForeignKey("event.id"))
+    item_id: Mapped[int]
+    event_id: Mapped[int | None] = mapped_column(ForeignKey("event.id"))
+    score: Mapped[int] = mapped_column(default=0, server_default="0")
     count: Mapped[int]
     raw: Mapped[bytes] = mapped_column(BLOB())
 
     user: Mapped[User] = relationship(back_populates="shares")
-    event: Mapped[Event] = relationship(back_populates="shares")
+    event: Mapped[Event | None] = relationship(back_populates="shares")