CACHET-CADB is 259 days long contextualised single-channel ECG arrhythmia database from 24 patients recording under a free-living ambulatory setting. Along with the ECG, it also contains contextual information such as activities, body position, movement acceleration, patients reported unusual symptoms/events diary, step counts, patient-reported sleep quality, stress level, and food intake. I contain 1602 ten-second long ECG samples of AF, NSR, noise, and other rhythm classes, which are manually annotated by two cardiologists. The ECG is sampled at 1024 Hz and a 12-bit resolution.<div><br></div><div>There is a short format of the dataset available at <a href="https://doi.org/10.11583/DTU.14547330">10.11583/DTU.14547330</a><br> <div><br></div><div>Further details and code for using the database can be found on the GitHub repository <a href="https://github.com/cph-cachet/cachet-ecg-db">https://github.com/cph-cachet/cachet-ecg-db</a>.</div></div>