server {
    listen 80;
    root /usr/share/nginx/html;
    index index.html;
    location = /health { add_header Content-Type text/plain; return 200 'ok'; }
    location /api/ { proxy_pass http://api:8000; proxy_set_header Host $host; client_max_body_size 1m; }
    location ~ ^/api/conversations/[0-9]+/(messages|runs/[0-9]+/events)$ {
        proxy_pass http://api:8000;
        proxy_set_header Host $host;
        proxy_buffering off;
        proxy_cache off;
        proxy_read_timeout 900s;
        proxy_send_timeout 900s;
        client_max_body_size 1m;
    }
    location / { try_files $uri /index.html; }
}