Fix

.gitignore

@@ -7,3 +7,4 @@ __pycache__/
 *.log
 /.env
 /token
+/=0.27

CLAUDE.md

@@ -1,12 +1,18 @@
-# btcprice
+# CLAUDE.md
 
-Bitcoin price tracker UI — Python FastAPI web application. Serves the HTML/Tailwind UI. Connects to btcdata for live price data via WebSocket.
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Overview
+
+Bitcoin price tracker UI — Python FastAPI web application. Serves an HTML/Tailwind page with live price updates streamed from btcdata (separate service) via WebSocket using HTMX.
 
 ## Build & Development Commands
 
-- `make run` — Start dev server on port 4000
-- `make tailwind` — Watch Tailwind CSS for changes
-- `make test` — Run tests
+- `make run` — Start dev server on port 4000 (connects to btcdata at BTCDATA_URL from `.env`)
+- `make run-local` — Start dev server using BTCDATA_LOCAL_URL from `.env`
+- `make tailwind` — Watch Tailwind CSS for changes (run in separate terminal)
+- `make test` — Run tests with pytest (`tests/` directory)
+- `npm run css:build` — One-off Tailwind CSS build
 
 ## Docker
 
@@ -17,20 +23,26 @@ Docker runs alongside local dev on different ports:
 | btcprice | localhost:4000 | localhost:4041 |
 | btcdata  | localhost:4100 | localhost:4101 |
 
-btcprice's docker-compose includes btcdata via `include: ../btcdata/docker-compose.yml`.
+Uses external `btc-network` Docker network. btcdata must be running separately (or via its own docker-compose).
 
 ## Architecture
 
-- **Framework:** FastAPI
-- **Server:** Uvicorn
-- **Templates:** Inline HTML strings + HTMX (WebSocket extension)
-- **Styling:** Tailwind CSS v4
+- **Framework:** FastAPI + Uvicorn
+- **Templates:** Inline HTML strings in Python + HTMX (WebSocket extension)
+- **Styling:** Tailwind CSS v4 — scans `app/**/*.py` for class names (configured in `resources/css/input.css` via `@source`)
 - **Data backend:** btcdata (separate service at BTCDATA_URL, default http://localhost:4100)
 - **No database** — all data comes from btcdata
 
-## Source Layout
+### Data Flow
 
-```
-app/
-└── main.py    # FastAPI app: routes, WebSocket proxy, HTML rendering
-```
+btcprice acts as a WebSocket proxy between the browser and btcdata:
+1. Browser connects via HTMX WebSocket to `/ws/price` or `/ws/strike`
+2. btcprice proxies to btcdata's `/api/price/ws` or `/api/strike/ws`
+3. JSON from btcdata is transformed into HTML fragments (in `price_json_to_html` / `strike_json_to_html`)
+4. HTMX swaps the HTML into the DOM by matching element IDs (`price-display`, `strike-display`)
+
+### Key Conventions
+
+- Numbers use Danish locale formatting (dots for thousands, commas for decimals) via `da_fmt()`
+- Price changes are color-coded: green (up), red (down), gray (unchanged)
+- All HTML is built as string concatenation in Python — no template engine

app/main.py

@@ -3,9 +3,10 @@ import logging
 import os
 from datetime import datetime
 
+import httpx
 import websockets
 from fastapi import FastAPI, WebSocket, WebSocketDisconnect
-from fastapi.responses import FileResponse, HTMLResponse
+from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
 from fastapi.staticfiles import StaticFiles
 
 logging.basicConfig(level=logging.INFO)
@@ -38,6 +39,7 @@ HOME_HTML = """\
 <link rel="stylesheet" href="/css/output.css">
 <script src="https://unpkg.com/htmx.org@2/dist/htmx.min.js"></script>
 <script src="https://unpkg.com/htmx-ext-ws@2/ws.js"></script>
+<script src="https://unpkg.com/lightweight-charts@4/dist/lightweight-charts.standalone.production.js"></script>
 </head>
 <body>
 <div class="mx-auto max-w-lg px-4 py-6">
@@ -58,8 +60,62 @@ HOME_HTML = """\
 </div>
 </div>
 </div>
+<div class="mt-4">
+<div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-6">
+<p class="text-sm text-gray-500 mb-3">1h Candles (1m)</p>
+<div id="chart-minute" style="height:300px"></div>
+</div>
+</div>
+<div class="mt-4">
+<div class="bg-white rounded-2xl shadow-sm border border-gray-200 p-6">
+<p class="text-sm text-gray-500 mb-3">24h Candles (1h)</p>
+<div id="chart-hour" style="height:300px"></div>
+</div>
+</div>
 <div class="hidden text-4xl text-2xl font-bold text-green-600 text-red-600 text-gray-900 text-xs text-gray-400 mt-2 flex justify-center justify-between items-center gap-4 mt-1 mt-3 text-sm text-gray-600 text-gray-500 mb-3 py-1 grid grid-cols-2 gap-x-6 gap-y-1" aria-hidden="true"></div>
 </div>
+<script>
+(function() {
+  function initChart(containerId, endpoint, intervalMs) {
+    const container = document.getElementById(containerId);
+    const chart = LightweightCharts.createChart(container, {
+      layout: { background: { type: 'solid', color: '#ffffff' }, textColor: '#6b7280' },
+      grid: { vertLines: { color: '#f3f4f6' }, horzLines: { color: '#f3f4f6' } },
+      rightPriceScale: { borderColor: '#e5e7eb' },
+      timeScale: { borderColor: '#e5e7eb', timeVisible: true, secondsVisible: false },
+    });
+    const series = chart.addCandlestickSeries({
+      upColor: '#16a34a', downColor: '#dc2626',
+      borderUpColor: '#16a34a', borderDownColor: '#dc2626',
+      wickUpColor: '#16a34a', wickDownColor: '#dc2626',
+    });
+    function loadData() {
+      fetch(endpoint)
+        .then(r => r.json())
+        .then(candles => {
+          const data = candles.map(c => ({
+            time: c.ts,
+            open: parseFloat(c.open),
+            high: parseFloat(c.high),
+            low: parseFloat(c.low),
+            close: parseFloat(c.close),
+          })).sort((a, b) => a.time - b.time);
+          series.setData(data);
+          chart.timeScale().fitContent();
+        })
+        .catch(e => console.error('Chart fetch error:', e));
+    }
+    loadData();
+    setInterval(loadData, intervalMs);
+    new ResizeObserver(() => {
+      chart.applyOptions({ width: container.clientWidth });
+    }).observe(container);
+  }
+
+  initChart('chart-minute', '/api/kraken-minute', 60 * 1000);
+  initChart('chart-hour', '/api/kraken-hour', 5 * 60 * 1000);
+})();
+</script>
 </body>
 </html>"""
 
@@ -77,6 +133,20 @@ async def health():
     return {"status": "up"}
 
 
+@app.get("/api/kraken-hour")
+async def kraken_hour():
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(f"{BTCDATA_URL}/api/kraken-hour", timeout=10)
+        return JSONResponse(content=resp.json(), status_code=resp.status_code)
+
+
+@app.get("/api/kraken-minute")
+async def kraken_minute():
+    async with httpx.AsyncClient() as client:
+        resp = await client.get(f"{BTCDATA_URL}/api/kraken-minute", timeout=10)
+        return JSONResponse(content=resp.json(), status_code=resp.status_code)
+
+
 # --- Formatting helpers (Danish locale) ---
 
 

requirements.txt

@@ -1,3 +1,4 @@
 fastapi>=0.115
 uvicorn[standard]>=0.34
 websockets>=14.0
+httpx>=0.27