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Re:“Fashion Is Hard. PostgreSQL Is Easy” [video] by ma2rten on Thursday June 18, 2015 @11:14AM (#9739041)
Even during the talk it was even mentioned. "Stored procedures are the core our success"

He also mentioned that Zelando does 100 data model (schema?) changes per week, and that senior dev make code changes without code review.

Re:“Fashion Is Hard. PostgreSQL Is Easy” [video] by valgog on Thursday June 18, 2015 @04:31PM (#9741450)
Yes, 100 data model changes are schema changes (that can be one or more table structure change)