Firebase database import tool

[dstpierre]

For existing Firebase users it would be interesting to offer an easy data migration from both Cloud Firestore and Firebase realtime database.

Some challenges I envision:

1. Firebase document security to StaticBackend's accountId/ownerId is TBD.
2. If the source data contains IDs in sub-document referring to other documents, those IDs would be regenerated by StaticBackend bulk import, but the referencing field value would not update. Maybe the import process could create a reference table with fields like Collection | FirebaseId | StaticBackendId that way the user has a way to run updates on their data after the import and change the old Firebase id.

Having access to real-world data exported from Firebase would help greatly for this, so if anyone has Firebase app they'd like migrated and are comfortable sharing part of their data export so this tool can be built, it could be very helpful.

Any thoughts is appreciated.