MetaBuilder

Philosophy: 95% JSON config, 5% TypeScript/C++ infrastructure Scale: 27,826+ files across 34 directories Status: Production-ready — Phase 2 complete

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What's Running

Pastebin — Code Snippet Manager

Full-stack app: Next.js frontend + Flask auth backend + C++ DBAL API

http://localhost/pastebin          # UI
http://localhost/pastebin-api      # Flask auth (register, login, Python runner)
http://localhost:8080              # DBAL C++ REST API (entities)

Test accounts (seeded on first startup):

User	Password	Namespaces	Snippets
demo	demo1234	Default, Python Recipes, SQL Patterns, Utilities	11
alice	alice1234	Default, React Components, CSS Tricks, JS Utilities	9
bob	bob12345	Default, Go Patterns, Bash Scripts, API Design	8

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Quick Start

# Deploy full stack
cd deployment
docker compose -f docker-compose.stack.yml up -d

# Build & deploy a specific app
python3 deployment.py build apps --force dbal pastebin

# Rebuild base images (rare)
python3 deployment.py build base

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Architecture

Browser
  └── Next.js (React + Redux + IndexedDB)
        └── Flask (auth, Python runner, JWT)
              └── DBAL C++ daemon (REST API, 14 DB backends)
                    └── PostgreSQL (prod) / SQLite (dev)

DBAL event flow (user registration → automatic seeding):

POST /User  →  pastebin.User.created  →  WfEngine (detached thread)
                  └── on_user_created.json workflow
                        ├── dbal.uuid × 7
                        ├── dbal.timestamp
                        ├── dbal.entity.create → Namespace "Default"
                        ├── dbal.entity.create → Namespace "Examples"
                        └── dbal.entity.create × 5 → seed snippets

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Key Directories

metabuilder/
├── dbal/
│   ├── production/          # C++ daemon (Drogon HTTP, 14 DB backends, JWT auth)
│   │   ├── src/workflow/    # Event-driven workflow engine (7 step types)
│   │   ├── src/auth/        # JWT validation + JSON ACL config
│   │   └── build-config/    # Dockerfile, CMakeLists, conanfile
│   └── shared/
│       ├── api/schema/      # JSON entity schemas (source of truth)
│       │   ├── entities/    # 39 entity definitions
│       │   ├── events/      # event_config.json → workflow mappings
│       │   └── workflows/   # on_user_created.json etc.
│       └── seeds/database/  # Declarative JSON seed data
├── frontends/pastebin/
│   ├── src/                 # Next.js app (React + Redux + FakeMUI)
│   └── backend/             # Flask auth + Python runner
├── workflow/                # DAG workflow engine (TS, Python, C++ plugins)
├── gameengine/              # SDL3/bgfx 2D/3D engine (27/27 tests)
├── fakemui/                 # Material Design clone (167 components)
├── packages/                # 62 feature packages
├── deployment/              # Docker compose stack + build scripts
└── CLAUDE.md                # AI assistant guide (read first)

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DBAL Backends (14)

Adapter	Backend
memory	In-process (testing)
sqlite	SQLite3
postgres	PostgreSQL
mysql / mariadb	MySQL / MariaDB
cockroachdb	CockroachDB
mongodb	MongoDB
redis	Redis (cache layer)
elasticsearch	Elasticsearch (search layer)
cassandra	Cassandra
surrealdb	SurrealDB
supabase	Supabase REST
prisma	Prisma ORM bridge

Switch adapter at runtime: DATABASE_URL=sqlite://:memory: DBAL_ADAPTER=sqlite

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Development

# Frontend (pastebin)
cd frontends/pastebin && npm run dev

# DBAL logs
docker logs -f metabuilder-dbal

# Admin seed endpoint (force re-seed)
curl -X POST http://localhost:8080/admin/seed \
  -H "Authorization: Bearer $DBAL_ADMIN_TOKEN" \
  -d '{"force": true}'

# Search docs / reports
cd txt && python3 reports.py search "topic"
cd docs && python3 docs.py search "topic"

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Schema-First Development

Entity schemas live in dbal/shared/api/schema/entities/ as JSON. They are the single source of truth — consumed by:

• C++ DBAL daemon (table creation, CRUD validation)
• gen_types.py (TypeScript + C++ type generation)
• Seed loader (entity-aware bulk insert)
• Workflow engine (entity creation steps)

# Regenerate types after schema changes
python3 dbal/shared/tools/codegen/gen_types.py

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Last Updated: 2026-03-04