Migrate location recorder and refine db config

app/models/__init__.py

@@ -1,2 +1,5 @@
 """SQLAlchemy models package."""
 
+from app.models.location import Location
+
+__all__ = ["Location"]

app/models/location.py

@@ -0,0 +1,15 @@
+from sqlalchemy import Float, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.db import Base
+
+
+class Location(Base):
+    __tablename__ = "location"
+
+    person: Mapped[str] = mapped_column(String, primary_key=True)
+    datetime: Mapped[str] = mapped_column(String, primary_key=True)
+    latitude: Mapped[float] = mapped_column(Float, nullable=False)
+    longitude: Mapped[float] = mapped_column(Float, nullable=False)
+    altitude: Mapped[float | None] = mapped_column(Float, nullable=True)
+