Expand the anonymous data claim process to include document settings transfer and TTS segment S3 prefix copying. Remove foreign key constraints from user_tts_chars to allow non-user buckets. Update claim modal and onboarding flow to display claimed document settings. Refactor TTS char count transfer to merge all dates and fix upsert logic. Add S3 copy utility for TTS segments and corresponding tests. Update migrations and schema to reflect relaxed constraints.
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