Every engine is streaming telemetry into a MSSQL database from 2009. Our analysts run reports overnight and pray.
Reports that used to run overnight now finish before the coffee is cold. 3× the telemetry on half the footprint.
The engineering team's dashboards and the airlines' customer-facing fleet health reports ran on two forks of the same MSSQL database that drifted apart weekly. Reconciliation was a person's Monday morning. Nobody trusted either copy.
We rebuilt it as a single lakehouse: S3 bronze for raw telemetry, silver for cleaned events, gold for the aggregates both audiences query. Engineers use Power BI, airlines hit a Redshift endpoint via API. One pipeline. Two audiences. Zero production incidents since launch.