Context
A commercial management application had to consolidate several store families and source systems into one interface without exposing the ERPs directly to the web layer.
Problem
Commercial sources are heterogeneous, publication schedules differ and some business rules require distinguishing missing data from a genuine zero. The interface must also remain usable when a remote source is temporarily unavailable.
Solution
Flask/Jinja + MariaDB architecture based on local caches and ERP connectors decoupled from the web layer. Scope includes store targets, prior-year comparison, planning, salespeople, multi-store summaries, business indicators, exports and controlled synchronization.
Key lesson
A reliable multi-source pipeline must be idempotent, observable and tested on every run.