Table riders { rider_id int [pk, increment] first_name varchar last_name varchar email varchar [unique] rating decimal }
Table drivers { driver_id int [pk, increment] first_name varchar last_name varchar status varchar [note: "offline, active_idle, on_trip"] rating decimal }
Table vehicles { vehicle_id int [pk, increment] driver_id int [ref: > drivers.driver_id] plate_number varchar model varchar }
Table trips { trip_id int [pk, increment] rider_id int [ref: > riders.rider_id] driver_id int [ref: > drivers.driver_id, null] pickup_lat decimal pickup_lng decimal drop_lat decimal drop_lng decimal status varchar fare decimal requested_at timestamp }
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