* feat(tables): background import for large CSVs with live progress * fix(tables): address review — import heartbeat, overlap guard, column/empty validation * fix(tables): guard sync import overlap, scope fileKey to workspace, delete-on-replace after download * fix(tables): stream large CSV imports from storage instead of buffering the whole file * test(tables): fix async-import route tests for workspace-scoped fileKey + name uniquification * fix(tables): append imports start after existing rows; reconcile missed import failures in the tray * fix(tables): delete the uploaded CSV from storage after the import finishes * fix(tables): validate replace before deleting rows; ignore stale replayed import events by importId * fix(tables): bind import worker to its importId (no stale-worker clobber/overlap) and destroy storage stream on failure * feat(tables): byte-based import progress, cancel support, and a start toast that opens the import view * fix(tables): don't emit ready after cancel; honor cancel during the upload phase * improvement(tables): use a stop (square) icon for canceling an active import * fix(tables): make markTableImporting an atomic claim to close the concurrent-import TOCTOU race * improvement(tables): preview CSV import from a slice, drop client row-count warning The import dialog parsed the entire file in the browser to show an exact row count and a row-limit warning. That holds the whole file in memory, blocks the main thread, and hits V8's ~512MB string ceiling — so the dialog capped the effective import size well below what the streaming importer handles. Parse only the first 512KB (headers + sample for the mapping); drop the exact count and the "would exceed the row limit by N" gate. The DB row-count trigger already enforces max_rows server-side, so an over-limit import fails fast during the run with a clear message instead of being blocked by an expensive parse. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(tables): gate import ownership every batch and stop canceled imports reappearing - Worker checked run ownership only at the progress cadence (~every 5k rows), so a canceled/superseded import could insert several more batches (incl. the final partial batch) before stopping. Move the updateImportProgress ownership gate to the top of every flush — a run that lost the table stops within one batch. - A list/dialog import canceled mid-upload left the server row `importing` until the in-flight server cancel landed; hydration re-seeded it from useTablesList, so the dismissed import flickered back. Flag the real table id canceled on the mid-upload cancel path, skip re-seeding flagged tables in hydration, and clear the flag once the server import is terminal. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * refactor(tables): drive import tray by polling derived from server, not SSE Import progress no longer holds an SSE connection per importing table. The tray now derives its importing rows live from the table list (React Query), polled only while an import is in flight; the table detail page keeps its own cell-state SSE for grid refresh. - store holds only client-only state now: optimistic uploads, which terminal completions to surface this session, canceled ids, menu open — no copied importStatus/rowsProcessed. - useWorkspaceImports is the single source: polls via a data-predicate refetchInterval, derives rows, and fires completion toasts on the importing -> terminal transition. - kickoff handlers use startUpload/setUploadPercent/endUpload; the invalidated list refetch surfaces the server row and polling takes over. - removes use-hydrate-import-tray + use-import-progress-tracker (folded in). - trims over-verbose comments across the import paths. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(tables): ignore superseded-run import events in the detail SSE cache applyImport applied every replayed import payload to the detail cache. The SSE buffer can replay a prior import's terminal event for the same table, stomping a newer in-flight import's UI. Lock to the active run's importId (and ignore a replayed terminal before the id is known), matching the guard the header tracker used to have. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(tables): close sync-import TOCTOU by claiming the atomic import gate The sync import route checked importStatus from a checkAccess snapshot, then parsed/validated/wrote seconds later without taking the atomic claim. A concurrent async kickoff (markTableImporting) could slip into that window and both writers would run together — for replace mode, two delete+insert passes leave the table indeterminate. Claim the same atomic gate (markTableImporting) right before the write and release it in the finally (before the response returns, so a client refetch never sees the transient status). A row-level FOR UPDATE was avoided on purpose: it would invert lock order against the position advisory lock / row-count trigger and risk a deadlock — markTableImporting is the established gate. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> * fix(multipart): keep abort wired after resolve so a mid-upload disconnect tears down the stream readMultipart resolves on the file-part header and hands the caller an un-drained stream, but settle() ran cleanup() and detached the abort listener on that path too. A client disconnect mid-upload then destroyed nothing — busboy never saw EOF, the file stream stalled, and the route's `for await` held a request slot until maxDuration (300s). Re-arm an abort handler scoped to the file stream on resolve, detached when the stream closes. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The open-source platform to build AI agents and run your agentic workforce. Connect 1,000+ integrations and LLMs to orchestrate agentic workflows.
Build Workflows with Ease
Design agent workflows visually on a canvas—connect agents, tools, and blocks, then run them instantly.
Supercharge with Copilot
Leverage Copilot to generate nodes, fix errors, and iterate on flows directly from natural language.
Integrate Vector Databases
Upload documents to a vector store and let agents answer questions grounded in your specific content.
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


