feat(mfa): add schema for recovery codes factor - #2725
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I left a few questions for you to consider. Otherwise, it looks good to me.
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- Adds unique user_id to mfa_recovery_code_sets as a workaround to avoid creating a unique index on mfa_factors (user_id) which would impact large tables. - Renames fields for consistency - Adds unique index on mfa_recovery_codes (mfa_recovery_code_set_id, code_hash) to prevent duplicate codes per set.
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Adds the schemas required to support MFA recovery codes factor.
Note
To avoid long running migration on Auth server startup due to
mfa_factors (user_id) where factor_type = 'recovery_codes', we've decided to denormalize theuser_idfield and add it to themfa_recovery_code_setswhich would provide similar guarantees of a user only allowed to have a single set of recovery codes.