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migrate from supabase to docker images
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‎.envrc.example‎

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export SUPABASE_PROJECT_REF=your-project-ref-here
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export DATABASE_URL=postgres://splitcount:password@localhost:5432/splitcount
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export PORT=3000

‎.github/workflows/deploy.yml‎

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name: Deploy to Supabase
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name: Build and Push Docker Image
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on:
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push:
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branches:
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- main
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env:
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REGISTRY: ghcr.io
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IMAGE_NAME: ${{ github.repository }}
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jobs:
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deploy:
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build-and-push:
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runs-on: ubuntu-latest
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permissions:
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contents: read
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packages: write
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steps:
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- uses: actions/checkout@v4
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- uses: supabase/setup-cli@v1
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- name: Log in to GitHub Container Registry
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uses: docker/login-action@v3
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with:
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version: latest
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- name: Link project
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run: supabase link --project-ref "$SUPABASE_PROJECT_REF"
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env:
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SUPABASE_ACCESS_TOKEN: ${{ secrets.SUPABASE_ACCESS_TOKEN }}
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SUPABASE_PROJECT_REF: ${{ secrets.SUPABASE_PROJECT_REF }}
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- name: Push database migrations
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run: supabase db push --password "$SUPABASE_DB_PASSWORD"
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env:
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SUPABASE_ACCESS_TOKEN: ${{ secrets.SUPABASE_ACCESS_TOKEN }}
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SUPABASE_PROJECT_REF: ${{ secrets.SUPABASE_PROJECT_REF }}
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SUPABASE_DB_PASSWORD: ${{ secrets.SUPABASE_DB_PASSWORD }}
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registry: ${{ env.REGISTRY }}
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username: ${{ github.actor }}
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password: ${{ secrets.GITHUB_TOKEN }}
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- name: Reload PostgREST schema cache
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run: |
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supabase db execute --sql "SELECT pg_notify('pgrst', 'reload schema');" 2>/dev/null \
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|| echo "Schema cache reload skipped — run manually if needed."
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env:
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SUPABASE_ACCESS_TOKEN: ${{ secrets.SUPABASE_ACCESS_TOKEN }}
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SUPABASE_PROJECT_REF: ${{ secrets.SUPABASE_PROJECT_REF }}
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- name: Extract metadata
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id: meta
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uses: docker/metadata-action@v5
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with:
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images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
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tags: |
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type=sha,prefix=
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type=raw,value=latest,enable={{is_default_branch}}
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- name: Deploy mcp edge function
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run: supabase functions deploy mcp --no-verify-jwt
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env:
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SUPABASE_ACCESS_TOKEN: ${{ secrets.SUPABASE_ACCESS_TOKEN }}
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SUPABASE_PROJECT_REF: ${{ secrets.SUPABASE_PROJECT_REF }}
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- name: Build and push
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uses: docker/build-push-action@v6
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with:
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context: .
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push: true
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tags: ${{ steps.meta.outputs.tags }}
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labels: ${{ steps.meta.outputs.labels }}

‎.github/workflows/test.yml‎

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name: Test
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on:
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pull_request:
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branches:
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- main
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push:
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branches:
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- main
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jobs:
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lint:
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runs-on: ubuntu-latest
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steps:
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- uses: actions/checkout@v4
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- uses: oven-sh/setup-bun@v2
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- run: bun install --frozen-lockfile
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- run: bun run check
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- run: bun run typecheck

‎.gitignore‎

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.env.*
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!.env.example
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.envrc
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supabase/.temp/
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node_modules/
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dist/
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.DS_Store

‎Dockerfile‎

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FROM oven/bun:1-alpine
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WORKDIR /app
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COPY package.json bun.lock* ./
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RUN bun install --frozen-lockfile --production
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COPY src/ ./src
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COPY migrations/ ./migrations
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ENV PORT=3000
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EXPOSE 3000
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CMD ["bun", "run", "src/index.ts"]

‎LICENSE‎

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MIT License
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Copyright (c) 2026 Dennis Falling
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎Makefile‎

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.PHONY: deploy
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.PHONY: install dev start typecheck docker-build docker-up docker-down
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# Deploy migrations and edge function.
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# Requires SUPABASE_PROJECT_REF to be set (via .envrc + direnv, or exported manually).
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deploy:
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./scripts/deploy.sh
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install:
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bun install
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dev:
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bun run --watch src/index.ts
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start:
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bun run src/index.ts
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typecheck:
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bun run tsc --noEmit
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docker-build:
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docker build -t splitcount .
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docker-up:
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docker compose up --build -d
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docker-down:
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docker compose down

‎README.md‎

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## Architecture
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- **MCP server**: Supabase Edge Function (Deno) at `supabase/functions/mcp/`
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- **Database**: Supabase PostgreSQL (groups, members, expenses, splits, settlements)
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- **MCP server**: Bun HTTP server at `src/`
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- **Database**: PostgreSQL (self-hosted or any provider)
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- **Client**: Any MCP-compatible client (Claude Desktop, Claude.ai, etc.)
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## Setup
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Migrations run automatically on startup. No migration tooling required.
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### 1. Create a Supabase project
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## Self-hosting with Docker
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Go to [supabase.com](https://supabase.com), create a new project, and note your project ref (visible in the project URL or Settings → General).
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The easiest way to run SplitCount is with Docker Compose. Add it to your existing stack:
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### 2. Set your project ref
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Add to `.envrc` (used by [direnv](https://direnv.net/)):
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```bash
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export SUPABASE_PROJECT_REF=<your-ref>
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```yaml
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services:
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splitcount:
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image: ghcr.io/dfalling/splitcount:latest
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environment:
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DATABASE_URL: postgres://user:password@your-postgres-host:5432/splitcount
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ports:
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- "3000:3000"
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restart: unless-stopped
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```
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Or export it manually:
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Or run the full stack including Postgres:
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```bash
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export SUPABASE_PROJECT_REF=<your-ref>
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docker compose up -d
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```
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### 3. Deploy
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The server will be available at `http://localhost:3000`.
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```bash
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make deploy
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```
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### Connect to Claude
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This links to your project, pushes database migrations, and deploys the MCP edge function. Your server URL will be printed at the end:
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In Claude Desktop or Claude.ai settings, add a custom MCP connector:
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```
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https://<your-ref>.supabase.co/functions/v1/mcp
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http://your-server:3000
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```
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### 4. Add as a custom connector
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## Local development
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**Prerequisites**: [mise](https://mise.jdx.dev/) for version management.
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```bash
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mise install # installs bun
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bun install # install dependencies
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cp .envrc.example .envrc
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# edit .envrc with your DATABASE_URL
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bun run dev # start with hot reload
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```
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In Claude Desktop or Claude.ai settings, add a custom MCP connector with your server URL:
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Test the server:
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```bash
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curl -X POST http://localhost:3000 \
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-H "Content-Type: application/json" \
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-d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'
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```
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https://<your-ref>.supabase.co/functions/v1/mcp
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Health check:
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```bash
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curl http://localhost:3000?health
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```
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## Usage
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### Create a group
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> "Create a new expense group called 'Barcelona Trip' with my name as Alex"
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Claude will return a **6-character join code** (e.g. `XK7M2P`) and your **member_id**. Share the join code with friends.
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Claude returns a **6-character join code** (e.g. `XK7M2P`) and your **member_id**. Share the join code with friends.
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### Join a group
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> "Join group XK7M2P, my name is Jordan"
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> "Join group XK7M2P"
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Claude will show you the existing member list so you can claim your slot or join as someone new.
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### Log an expense
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> "Log a $45 dinner expense, I paid, split equally among everyone"
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**From a receipt photo**: Share the image with Claude, then ask it to log it:
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**From a receipt photo**: share the image with Claude, then ask it to log it:
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> "Here's my receipt [image]. Add it as an expense split equally."
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Claude will read the receipt, extract the amount and description, and call `add_expense` with the details.
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Claude reads the receipt, extracts the amount and description, and calls `add_expense`.
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### Check balances
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> "Who owes what in our group?"
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## Identity model
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There is no login. When you create or join a group, you receive a **member_id** (UUID). This is your permanent identity — save it. Claude stores it in conversation context and will remind you to note it down.
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There is no login. When you create or join a group you receive a **member_id** (UUID). This is your permanent identity — save it. Claude stores it in conversation context and will remind you to note it down.
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If you switch devices or start a new conversation, use `get_member` to confirm your identity:
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If you start a new conversation, use `get_member` to confirm your identity:
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> "My member ID is abc123... — what group am I in?"
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## Tools
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| Tool | Description |
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|------|-------------|
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| `create_group` | Create a group, get a join code |
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| `join_group` | Join with a join code + display name |
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| `join_group` | Join with a join code; shows member list to claim or create |
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| `get_group` | Group info and member list |
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| `add_expense` | Log an expense (equal/exact/percent splits) |
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| `list_expenses` | View expenses with split details |
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| `update_expense` | Edit an expense you logged |
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| `delete_expense` | Soft-delete an expense you logged |
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| `get_balances` | Net balances + minimum payments to settle |
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| `record_settlement` | Record a payment between members |
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| `get_settlement_history` | Past settlements |
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| `add_member` | Pre-add a member before they join |
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| `claim_member` | Identify as an existing member |
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| `list_members` | List all members in a group |
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| `get_member` | Look up your member info |
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| `rename_member` | Change your display name |
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## Local development
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```bash
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supabase start # starts local Postgres + Edge Functions runtime
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supabase functions serve mcp --no-verify-jwt
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```
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## Database migrations
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Test with curl:
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```bash
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curl -X POST http://localhost:54321/functions/v1/mcp \
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-H "Content-Type: application/json" \
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-d '{"jsonrpc":"2.0","id":1,"method":"tools/list","params":{}}'
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```
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Migrations live in `migrations/` and are applied automatically at startup in order. To add a new migration, create a file named `NNN_description.sql` (e.g. `005_add_tags.sql`).

‎biome.json‎

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{
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"$schema": "https://biomejs.dev/schemas/2.4.10/schema.json",
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"vcs": {
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"enabled": true,
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"clientKind": "git",
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"useIgnoreFile": true
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},
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"files": {
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"ignoreUnknown": false
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},
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"formatter": {
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"enabled": true,
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"indentStyle": "space",
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"indentWidth": 2
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},
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"linter": {
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"enabled": true,
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"rules": {
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"recommended": true
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}
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},
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"javascript": {
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"formatter": {
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"quoteStyle": "double"
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}
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},
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"assist": {
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"enabled": true,
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"actions": {
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"source": {
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"organizeImports": "on"
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}
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}
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}
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}

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