At 8 months out you may have a dozen open threads: caterer A, photographer B, a friend's DJ pick. Each quote lives in a different email.
When we interviewed Fiancé couples, the top budget overrun was not luxury: it was "I forgot that 400 € option in quote v2".
What a good vendor file should hold
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Contact (name, email, phone, website)
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Quote received with date and total incl. tax
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Status: prospect, quote pending, booked, declined
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Next action: follow up, sign, deposit
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Notes: inclusions, exclusions, weather clauses