New visible_from column on lead_requests set to NOW + 2h on both the
direct insert (logged-in user) and the email verification update.
Supplier feed, notify_matching_suppliers, and send_weekly_lead_digest
all filter on visible_from <= datetime('now'), so no lead surfaces to
suppliers before the window expires.
Migration 0023 adds the column and backfills existing verified leads
with created_at so they remain immediately visible.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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