Migrate location recorder and refine db config

app/services/location.py

@@ -0,0 +1,36 @@
+from datetime import datetime, timezone
+
+from sqlalchemy import insert
+from sqlalchemy.orm import Session
+
+from app.models.location import Location
+from app.schemas.location import LocationRecordRequest
+
+
+def _parse_float_compat(value: str) -> float:
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return 0.0
+
+
+def _utc_now_rfc3339() -> str:
+    now = datetime.now(timezone.utc).replace(microsecond=0)
+    return now.isoformat().replace("+00:00", "Z")
+
+
+def record_location(session: Session, payload: LocationRecordRequest) -> None:
+    stmt = (
+        insert(Location)
+        .prefix_with("OR IGNORE")
+        .values(
+            person=payload.person,
+            datetime=_utc_now_rfc3339(),
+            latitude=_parse_float_compat(payload.latitude),
+            longitude=_parse_float_compat(payload.longitude),
+            altitude=_parse_float_compat(payload.altitude),
+        )
+    )
+    session.execute(stmt)
+    session.commit()
+