Waleed
272bad9718
* feat(realtime): preflight schema-compatibility check on startup The socket service authorizes every connection with a full-row query against the workflow table. When a deploy ships a realtime image whose compiled schema is ahead of/behind the live DB (e.g. a column dropped by a migration the image predates), that query fails on every request and silently breaks persistence — yet the process stays up and the shallow /health probe keeps returning 200, so the deploy looks healthy while serving nothing. Run one representative workflow query before listen(): a schema mismatch throws, propagates to the entrypoint, and the task exits non-zero and never goes healthy, so CodeDeploy auto-rolls-back instead of shifting traffic onto broken tasks. Schema-class errors (undefined column/table/function) fail fast; connection-class errors retry with backoff so a cold DB at boot does not flap. Runs once at startup, never on the per-probe LB health check, to avoid a DB blip mass- terminating the fleet (cascading failure). * fix(realtime): unwrap cause for schema codes, drop sleep after final attempt - isSchemaMismatch now walks the error.cause chain — drizzle wraps the driver error, so the SQLSTATE often lives on the inner cause, not the outer throw. Without this a wrapped 42703/42P01 was retried 5x and mis-reported as "database unreachable" instead of failing fast. - No longer sleeps after the final failed attempt (~6-10s of dead wait that undermined the fail-fast contract); sleep now only happens between attempts. - Tests: assert sleep is called exactly 4 times on exhaustion, and add a wrapped-cause fail-fast case.
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Quickstart
Cloud-hosted: sim.ai
Self-hosted: NPM Package
npx simstudio
Note
Docker must be installed and running on your machine.
Options
| Flag | Description |
|---|---|
-p, --port <port> |
Port to run Sim on (default 3000) |
--no-pull |
Skip pulling latest Docker images |
Self-hosted: Docker Compose
git clone https://github.com/simstudioai/sim.git && cd sim
docker compose -f docker-compose.prod.yml up -d
Sim also supports local models via Ollama and vLLM. See the Docker self-hosting docs for setup details.
Self-hosted: Manual Setup
Requirements: Bun, Node.js v20+, PostgreSQL 12+ with pgvector
- Clone and install:
git clone https://github.com/simstudioai/sim.git
cd sim
bun install
bun run prepare # Set up pre-commit hooks
- Set up PostgreSQL with pgvector:
docker run --name simstudio-db -e POSTGRES_PASSWORD=your_password -e POSTGRES_DB=simstudio -p 5432:5432 -d pgvector/pgvector:pg17
Or install manually via the pgvector guide.
- Configure environment:
cp apps/sim/.env.example apps/sim/.env
# Create your secrets
perl -i -pe "s/your_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_internal_api_secret/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_api_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
# DB configs for migration
cp packages/db/.env.example packages/db/.env
# Edit both .env files to set DATABASE_URL="postgresql://postgres:your_password@localhost:5432/simstudio"
- Run migrations:
cd packages/db && bun run db:migrate
- Start development servers:
bun run dev:full # Starts Next.js app and realtime socket server
Or run separately: bun run dev (Next.js) and cd apps/sim && bun run dev:sockets (realtime).
Copilot API Keys
Copilot is a Sim-managed service. To use Copilot on a self-hosted instance:
- Go to https://sim.ai → Settings → Copilot and generate a Copilot API key
- Set
COPILOT_API_KEYenvironment variable in your self-hosted apps/sim/.env file to that value
Environment Variables
See the environment variables reference for the full list, or apps/sim/.env.example for defaults.
Tech Stack
- Framework: Next.js (App Router)
- Runtime: Bun
- Database: PostgreSQL with Drizzle ORM
- Authentication: Better Auth
- Schema Validation: Zod
- UI: Shadcn, Tailwind CSS
- Streaming Markdown: Streamdown
- State Management: Zustand, TanStack Query
- Flow Editor: ReactFlow
- Docs: Fumadocs
- Monorepo: Turborepo
- Realtime: Socket.io
- Background Jobs: Trigger.dev
- Remote Code Execution: E2B
- Isolated Code Execution: isolated-vm
Contributing
We welcome contributions! Please see our Contributing Guide for details.
License
This project is licensed under the Apache License 2.0 - see the LICENSE file for details.
Made with ❤️ by the Sim Team