app.py

from flask import Flask, render_template, request, jsonify
import json

app = Flask(__name__)

# Store nodes and connections in memory (replace with database for persistence)
nodes = []
connections = []

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/save_nodes', methods=['POST'])
def save_nodes():
    global nodes, connections
    data = request.get_json()
    nodes = data.get('nodes', [])
    connections = data.get('connections', [])
    return jsonify({'status': 'success', 'nodes': nodes, 'connections': connections})

if __name__ == '__main__':
    app.run(debug=True)