- The stack uses Docker containers orchestrated via docker-compose. The script boots Anvil, deploys contracts, seeds liquidity, starts Ponder, launches the landing site, and runs the txnBot. Wait for logs to settle before manual testing.
- **Prerequisites**: Docker Engine (Linux) or Colima (Mac). See installation instructions below.
- Integration: after the stack boots, inspect Anvil logs, hit `http://localhost:8081/api/graphql` for Ponder, and poll `http://localhost:8081/api/txn/status` for txnBot health.
- **E2E Tests**: Playwright-based full-stack tests in `tests/e2e/` verify complete user journeys (mint ETH → swap KRK → stake). Run with `npm run test:e2e` from repo root. Tests use mocked wallet provider with Anvil accounts and automatically start/stop the stack. See `INTEGRATION_TEST_STATUS.md` and `SWAP_VERIFICATION.md` for details.
- **Contract VERSION**: `Kraiken.sol` exposes a `VERSION` constant (currently v1) that must be incremented for breaking changes to TAX_RATES, events, or core data structures.
- **Ponder Validation**: On startup, Ponder reads the contract VERSION and validates against `COMPATIBLE_CONTRACT_VERSIONS` in `kraiken-lib/src/version.ts`. Fails hard (exit 1) on mismatch to prevent indexing wrong data.
- **Frontend Check**: Web-app validates `KRAIKEN_LIB_VERSION` at runtime (currently placeholder; future: query Ponder GraphQL for full 3-way validation).
- **CI Enforcement**: GitHub workflow validates that contract VERSION is in `COMPATIBLE_CONTRACT_VERSIONS` before merging PRs.
- See `VERSION_VALIDATION.md` for complete architecture, workflows, and troubleshooting.
- **Linux**: Install Docker Engine via package manager or `curl -fsSL https://get.docker.com | sh`, then add user to docker group: `sudo usermod -aG docker $USER` (logout/login required)
- **Mac**: Use Colima (open-source Docker Desktop alternative):
```bash
brew install colima docker docker-compose
colima start --cpu 4 --memory 8 --disk 100
docker ps # verify installation
```
- **Container Orchestration**: `docker-compose.yml` has NO `depends_on` declarations. All service ordering is handled in `scripts/dev.sh` via phased startup with explicit health checks.
- **Startup Phases**: (1) Create all containers, (2) Start anvil+postgres and wait for healthy, (3) Start bootstrap and wait for completion, (4) Start ponder and wait for healthy, (5) Start webapp/landing/txn-bot, (6) Start caddy.
- **Logging Configuration**: All services have log rotation configured (max 10MB per file, 3 files max = 30MB per container) to prevent disk bloat. Logs are automatically rotated by Docker.
- **Disk Management** (Portable, No Per-Machine Setup Required):
- **20GB Hard Limit**: The stack enforces a 20GB total Docker disk usage limit (images + containers + volumes + build cache).
- **Pre-flight Checks**: `./scripts/dev.sh start` checks Docker disk usage before starting and refuses to start if over 20GB.
- **Aggressive Auto-Cleanup on Stop**: `./scripts/dev.sh stop` automatically prunes ALL unused Docker resources including build cache (the primary cause of bloat).
- **Named Volumes for node_modules**: All Node.js services (ponder, webapp, landing, txnBot) use named Docker volumes for `node_modules/` instead of writing to the host filesystem. This prevents host pollution (20-30GB savings) and ensures `docker system prune --volumes` cleans them up.
- **npm Best Practices**: All entrypoints use `npm ci` (not `npm install`) for reproducible builds and `npm cache clean --force` to remove ~50-100MB of cache per service.
- **PostgreSQL WAL Limits**: Postgres configured with `wal_level=minimal`, `max_wal_size=128MB`, and `archive_mode=off` to prevent unbounded WAL file growth in the postgres volume.
- **Log Rotation**: All containers limited to 30MB logs (10MB × 3 files) via docker-compose logging configuration.
- **.dockerignore**: Excludes `node_modules/`, caches, and build outputs from Docker build context to speed up builds and reduce image size.
- **Monitoring**: The stack displays current Docker disk usage on startup and warns at 80% (16GB).
- **Note**: Docker has no built-in portable disk quotas. All limits are enforced via aggressive pruning, bounded configurations, and isolation of dependencies to Docker volumes.
- **ES Modules**: The entire stack uses ES modules. kraiken-lib, txnBot, Ponder, and web-app all require `"type": "module"` in package.json and use `import` syntax.
- **Pre-commit Hooks**: Husky runs lint-staged on all staged files before commits. Each component (onchain, kraiken-lib, ponder, txnBot, web-app, landing) has `.lintstagedrc.json` configured for ESLint + Prettier.
- **Version Validation (Future)**: Pre-commit hook includes validation logic that will enforce version sync between `onchain/src/Kraiken.sol` (contract VERSION constant) and `kraiken-lib/src/version.ts` (COMPATIBLE_CONTRACT_VERSIONS array). This validation only runs if both files exist and contain version information.
- **Husky Setup**: `.husky/pre-commit` orchestrates all pre-commit checks. Modify this file to add new validation steps.
- To test hooks manually: `git add <files> && .husky/pre-commit`
