Please add support for importing legacy MeshCore iOS app backups exported as raw SQLite `.db` files

[PrimeDeep1]

Users migrating from the original MeshCore iOS app to MeshCore One may have an existing MeshCore backup file like:

meshcore_.db

MeshCore One currently appears to expect .mc1backup files for full restore/migration, while the old app exports a raw SQLite database. Renaming .db to .mc1backup does not work.

What the legacy database contains

The legacy backup is a valid SQLite DB and can include:

• contacts
• channels
• contact / DM messages
• channel messages
• device/config-related tables

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One of the following would solve this:

1. Direct import of legacy .db backups
2. A migration tool (.db -> .mc1backup)
3. Partial import (contacts + channels at minimum)
4. Documentation of .mc1backup format for community tooling

When switching to MeshCoreOne, one effectively losees their chat history and has to rebuild everything manually, despite having a full backup.

A migration path would massively improve adoption and prevent data loss.

thanks, MeshCoreOne is awesome and this would make it a complete upgrade path 🙏