Coolify MySQL (instantadpay-db) via DATABASE_URL; db.js bootstraps schema
and one-time imports the volume JSON. accounts/auth/ads are dual-mode: the
MySQL path uses guarded UPDATEs for the concurrent ad-serving hot path;
without DATABASE_URL the JSON stores remain (local dev). All data functions
async; server boots through db.init. Chain index stays a file: it is a
rebuildable cache of the blockchain, which remains the money truth.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>