backup sqlite database automatically before running migrations

[wsxiaoys]

Please describe the feature you want

For example, if running a migration, the backup file name should be named as db.backup-${date}.sqlite.

Additional context Add any other context or screenshots about the feature request here.

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Please reply with a 👍 if you want this feature.

[darknight]

@wsxiaoys Hi, I'd like to take it :)

[wsxiaoys]

released in 0.18