Solana Foundation program for managed token delegations: Subscription Authority, fixed/recurring allowances, merchant subscription plans. Program De1egAFMkMWZSN5rYXRj9CAdheBamobVNubTsi9avR44. SDK @solana/subscriptions.
Open-source columnar OLAP database widely used for Solana analytics and historical ledger query layers (e.g. CryptoHouse, Triton Superbank). High insert rates, compression, analytical SQL over large event tables.