Definitions

The reusable vocabulary of the club: membership types, certificates, flight tasks, duty types, transaction types and custom fields.

Small lists of reference data that the rest of the app draws on.

The membership-type vocabulary every member is assigned to — the basis for pricing tiers and recurring fees.

Definitions of pilot licenses and ratings, with the validity intervals that feed proficiency tracking and qualification checks.

The catalogue of flight activity types — dual, solo, tow, cross-country — used to classify flights and drive pricing.

The classifications of club duties and shifts — line management, retriever crew, instructor — used to roster and bill duties.

The categories used to classify ledger entries — flight charge, membership fee, refund, penalty — so payments and statistics group meaningfully.

Club-defined fields added to members, aircraft and flights without any schema change, letting each club capture data the base model doesn't cover.