feat: prevent duplicate driver trips at same date and time

app/database/supabase.py

@@ -421,6 +421,24 @@ class SupabaseRepository:
         )
         return _response_data(response)
 
+    async def get_driver_trip_by_datetime(
+        self,
+        driver_id: str,
+        departure_date: date,
+        departure_time: str,
+    ) -> dict[str, Any] | None:
+        response = await (
+            self.client.table("driver_trips")
+            .select("id, departure, destination, departure_date, departure_time")
+            .eq("driver_id", driver_id)
+            .eq("status", "active")
+            .eq("departure_date", departure_date.isoformat())
+            .eq("departure_time", departure_time)
+            .maybe_single()
+            .execute()
+        )
+        return _response_data(response)
+
     async def list_driver_cars(self, driver_id: str) -> list[dict[str, Any]]:
         response = await (
             self.client.table("driver_cars")

app/tools/handlers.py

@@ -396,6 +396,21 @@ class FalsaToolHandlers:
                 error="departure_time must be morning, noon, night, or Arabic صباح / ظهر / ليل",
             )
 
+        existing = await self.repository.get_driver_trip_by_datetime(
+            driver_id=str(driver["id"]),
+            departure_date=parsed_date,
+            departure_time=departure_time,
+        )
+        if existing:
+            return ToolResult(
+                ok=False,
+                data={"existing_trip_id": existing.get("id")},
+                error=(
+                    "You already have a trip scheduled at this date and time. "
+                    "Cancel or modify the existing trip before creating a new one."
+                ),
+            )
+
         latest_trip = await self.repository.get_driver_latest_trip(str(driver["id"]))
         cars = await self.repository.list_driver_cars(str(driver["id"]))