A time-series database that lives inside your process.

use fieldnote::{Db, Point, Window};

// one file, no server, no config
let db = Db::open("sensors.fn")?;

db.write("greenhouse.temp", Point {
    at:    now(),
    value: 21.4,
    tags:  &[("bed", "north")],
})?;

// downsample four million rows
let hourly = db
    .series("greenhouse.temp")
    .between(week_ago(), now())
    .window(Window::Hours(1))
    .mean()?;

assert_eq!(hourly.len(), 168);