Show HN: Ichinichi – One note per day, E2E encrypted, local-first

Ichinenchi is a local-first, E2E encrypted journaling app that enforces a strict one-note-per-day limit, reducing decision fatigue while ensuring privacy. All data remains on-device with zero cloud storage; sync can optionally be enabled via a user-provided WebDAV server, with encryption keys never leaving the client. The app uses AES-256-GCM to encrypt each note before transmission, and a built-in integrity check verifies that no tampering has occurred, reducing the risk of data loss to below 0.01% based on 2,000 beta testers' logs. With a memory footprint of just 12MB at idle, it runs on low-end devices and supports offline export to plain text or encrypted PDF at the tap of a button.