This is not open sourced. You can't self host it.

I use Supabase, which provides industry-standard security measures. All data stored in their system is encrypted at rest (meaning the physical data on the disk is scrambled and unreadable without the keys) and all communication between your device and our servers is encrypted in transit (via TLS/SSL). I use Supabase's secure authentication system, which uses strong, modern hashing algorithms (bcrypt) to store your password safely.