diff --git a/backend/app/models/user.py b/backend/app/models/user.py
index 4feeaca..e5ffbcb 100644
--- a/backend/app/models/user.py
+++ b/backend/app/models/user.py
@@ -52,6 +52,7 @@ class GarminConnectConfig(Base):
     sync_enabled = Column(Boolean, default=True)
     sync_activities = Column(Boolean, default=True)
     sync_wellness = Column(Boolean, default=True)
+    sync_lookback_days = Column(Integer, default=30)   # -1 = all-time
     last_sync_at = Column(DateTime(timezone=True), nullable=True)
     last_sync_status = Column(String(512), nullable=True)
     created_at = Column(DateTime(timezone=True), default=now_utc)