init

transport/backend/app/models/position.py

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+from datetime import datetime
+from sqlalchemy import DateTime, Float, ForeignKey, Index
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class Position(Base):
+    __tablename__ = "positions"
+
+    id: Mapped[int] = mapped_column(primary_key=True)
+    vehicle_id: Mapped[int] = mapped_column(ForeignKey("vehicles.id", ondelete="CASCADE"))
+    timestamp: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=datetime.utcnow)
+    lat: Mapped[float] = mapped_column(Float, nullable=False)
+    lon: Mapped[float] = mapped_column(Float, nullable=False)
+    speed: Mapped[float] = mapped_column(Float, default=0.0)  # km/h
+    heading: Mapped[float] = mapped_column(Float, default=0.0)  # 0-360 degrees
+
+    # Relationships
+    vehicle: Mapped["Vehicle"] = relationship(back_populates="positions")
+
+    __table_args__ = (
+        Index("idx_positions_vehicle_ts", "vehicle_id", "timestamp"),
+    )