Data input

The pipeline now supports three cert types, each with its own source format:

• Attendee — CSV
• Masterclass — XLSX (Excel)
• Speaker — JSON

The exact column / key requirements for each, plus how each field maps onto the Attendee model and how UUIDs are derived, live in the canonical walkthrough:

Walkthrough §3 — Data sources & columns

That page is the single source of truth. This file is kept only as a stub so existing links keep resolving; do not duplicate the column mappings here.