Research Sample Recovery Equal-Width Histogram

Choose this endpoint when you need a quick, local descriptive frequency distribution (histogram) of research sample recovery mass data without any enrichment or forecasting. It is purpose-built for laboratory or research contexts where you have typed records with specimen, date, and mass fields. Prefer it over general-purpose statistics APIs when your data fits the sample recovery schema and you need a bounded equal-width histogram specifically.

• Fewer than 1 or more than 200 rows submitted — request rejected
• bins value outside 1–30 range — validation error
• Missing required row fields (row_id, date, input_mass_g, recovered_mass_g) — schema validation failure
• Date strings not in YYYY-MM-DD format — pattern validation error
• field value not one of 'input_mass_g' or 'recovered_mass_g' — enum validation error
• All values for selected field are null — histogram cannot be computed
• Payment not included or insufficient — 402 payment required response