Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Production deployment guide with environment matrix
Error codes documentation with frontend-friendly message mapping
Release process documentation with semantic versioning policy
Backend API request schema documentation with curl examples
Error mapping utility for frontend error handling
Backend .env.example configuration template
Backend distributed tracing via OpenTelemetry (#288) — auto-instrumentation of Express + outbound HTTP, manual spans for DB / Soroban RPC / job runner, traceparent propagated to the frontend.
Frontend CLI + UI for Merkle allowlist proof generation (#294) — scripts/generate-merkle.mjs, browser-compatible merkle.js helper, admin upload flow, docs/MERKLE_ALLOWLIST.md walkthrough.
Frontend transaction history page (#295) — /history route querying Horizon operations filtered to the rewards + campaign contract IDs, paginated cursor view, Header link visible when wallet is connected.

Improved documentation structure for operators and contributors
BREAKING (contract storage): campaign participant records moved from instance storage to persistent storage (#280). Per-user data no longer counts against the 64KB instance cap, lifting the practical participant ceiling from ~1.8k to "as many as TTL economics allow". PARTICIPANT_COUNT aggregate stays in instance storage. See docs/upgradeability.md for the deployer migration path on already-live campaigns.