source-hub

Backend pipeline that pulls items from Gmail, Notion, Linear, and Google Calendar into a single Postgres database, normalizing each one into a common shape (source, sender/creator, origin org, summary, category, relevant date) via a pluggable language-model extraction step. Exposes the result through a REST API, a set of stats endpoints for charting, and an MCP server for querying directly from a client that speaks MCP.

No frontend here by design — this is the data layer a separate web app is expected to read from.

Features

• Connectors: Gmail, Notion, Linear, Google Calendar — each does incremental polling via a stored cursor, so re-runs only fetch what changed.

• Extraction: every new/changed item is normalized into a fixed schema (title, summary, category, sender, org, relevant date) through a pluggable LLM provider — Anthropic by default, or any OpenAI-compatible endpoint (Ollama, vLLM, LM Studio, OpenRouter, etc.), so it also runs against open-weight models.

• Storage: Postgres with a two-stage design — a raw_items landing table (content-hashed, so unchanged items skip re-extraction) and a normalized items table with full-text search, JSONB metadata per source, and indexes for common filters.

• REST API: filtered item queries, status updates, a natural-language /ask endpoint (the model chooses its own query filters), and stats endpoints (breakdown, time-series at any granularity from year down to second, period-over-period comparison, distribution histograms).

• MCP server: the same data, exposed as MCP tools, so a chat client can query it directly without opening a web page.

See ARCHITECTURE.md for the system design in detail.

Related MCP server: Notion MCP Server

Requirements

• Node.js 18+

• Docker (for local Postgres) or any reachable Postgres 14+ instance

• API credentials for whichever sources you want to sync, and for whichever LLM provider you configure

Setup

npm install
cp .env.example .env   # fill in DATABASE_URL and the credentials you have
docker compose up -d   # starts a local Postgres if you don't have one already
npm run migrate

Usage

npm run sync                  # sync all configured sources once
npm run sync -- --source=email
npm run api                   # start the REST API
npm run mcp                   # start the MCP server (stdio)
npm run mcp:debug             # same, wrapped with protocol tracing for debugging

Scans

npm run typecheck
npm run scan:sast             # ESLint + security rules
npm run scan:secrets          # secretlint
npm run scan:deps             # npm audit

REST API

Set API_KEY in .env to require a bearer token on every route except /health.

MCP tools

query_items, get_urgent_today, get_today_counts, get_series, get_breakdown, get_compare, get_distribution, get_item, set_item_status.

Configuration

See .env.example for the full list. Only DATABASE_URL and one LLM provider's credentials are required; source credentials (Gmail/Notion/Linear/Calendar) are independent of each other — configure only the ones you use.