feat: work shifts by QR codes

models/work_shifts.py

@@ -0,0 +1,30 @@
+from datetime import datetime
+from typing import TYPE_CHECKING
+
+from sqlalchemy import ForeignKey
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from models.base import BaseModel
+
+if TYPE_CHECKING:
+    from models import User
+
+
+class WorkShift(BaseModel):
+    __tablename__ = "work_shifts"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    started_at: Mapped[datetime] = mapped_column(
+        nullable=False,
+    )
+    finished_at: Mapped[datetime] = mapped_column(
+        nullable=True,
+    )
+
+    user_id: Mapped[int] = mapped_column(
+        ForeignKey("users.id"),
+    )
+    user: Mapped["User"] = relationship(
+        "User",
+        back_populates="work_shifts",
+    )