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0e9cfbce66
Every SQL tonnage in the export datasets and report definitions used `COALESCE(b.bulk_total_weight_tons, b.cargo_total_weight_vgm)`. COALESCE falls through on NULL, never on 0 — and the portal booking wizard stores `cargo_total_weight_vgm = 0` for container freight on purpose, because VGM is captured per container line, not as a booking-level figure. So every portal-created container booking reported as weighing nothing. The backoffice wizard does store a booking-level total, so the same table holds both shapes and the numbers looked erratic rather than uniformly zero. Extract the resolver the TypeScript side already has three copies of (bookingCargoTons, cargoTonsAndItems, totalVgmTons) into one SQL helper: NULLIF both booking-level columns, then fall back to SUM(booking_container.total_vgm_tons). Applied to the bookings and train-schedules export datasets, the cargo-summary, contract-utilization and booking-status-breakdown reports, and the intercity booking list. On dev data this recovers 116 of 154 zero-weight container bookings and raises live booking tonnage from 42,973 t to 61,424 t.