The problem is familiar to any adult who manages a household: legal and financial documents like insurance policies, wills, property deeds, warranties, and tax records pile up across inboxes, drives, and filing cabinets. They get misnamed, duplicated, buried, and worst of all they silently expire. Nobody notices a lapsed policy or an outdated beneficiary form until it causes real harm. The HN thread 'Ask HN: How do you manage your family data warehouse?' captures this exactly, where people describe tracking documents not just for themselves but for spouses, kids, and aging parents over years. Willo Document Vault is a SaaS that automatically collects, names, and expires personal documents so nothing gets lost or outdated. The solution has three jobs: ingest documents from email and uploads, apply consistent naming and categorization, and attach lifecycle metadata so each document has an expiry or review date that triggers reminders. An MVP would focus narrowly: connect a Gmail account, auto-detect and extract common document types, name them with a consistent scheme, and surface a dashboard of what expires when. Revenue is a simple consumer subscription, likely 5 to 12 dollars per month, with a family tier for managing documents across relatives. Given comparables in the one to ten thousand dollar MRR range, this is a modest lifestyle-scale business unless family and estate-planning angles lift willingness to pay. Go to market starts with the HN and self-hoster crowd who are actively asking how to solve this, then expands via content around household admin, estate preparation, and insurance renewal. Growth loops are weak for a private single-user product, but the family tier creates natural invitations: one organized person brings in a spouse or parent, and shared vaults spread document-by-document across a household.