New migration 0021 adds 7 indexes for columns used in WHERE clauses
across admin list routes and the worker refill handler:
- lead_requests(lead_type) — for all lead-type filters
- lead_requests(lead_type, status) — compound filter in lead queries
- lead_requests(lead_type, verified_at) — refill eligibility queries
- lead_requests(country) — country filter in lead results
- suppliers(tier) — tier filter in supplier admin list
- suppliers(claimed_by) — claimed/unclaimed filter
- credit_ledger(supplier_id) — SUM(delta) balance aggregation
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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