swiftship_logistics: a made-up parcel company with hubs in Pune, Mumbai, Dubai, London and Singapore.
One row in hubs = one hub. One row in customers = one customer. One row in shipments = one parcel shipment.
One row in hub_contacts = one contact person; a hub can have more than one, so hub_id repeats there.
Fees are whole units of the hub's own currency (INR, AED, GBP). Never add fees from different currencies together.
Shipment 1009 has hub_id 9, which is a typo: no hub 9 exists. Shipment 1010 has hub_id NULL: no hub assigned yet.
agents.raw_name is typed by hand and messy on purpose (extra spaces, mixed case, one missing name).
