feat: scale improvements — O(1) reporting, Redis idempotency cache, centi-cent accrual#12

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feat/improvement

Apr 12, 2026

Commits on Apr 12, 2026

feat: add ledger_totals table and wallets.fractional_balance column
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docs: document bigint mode:number safety bound in ledger_totals schema
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feat: replace ledger GROUP BY scan with O(1) ledger_totals SELECT
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test: assert from() called with ledgerTotals in aggregate test
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feat: maintain ledger_totals running total on deposit
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fix: use upsert for ledger_totals to handle missing rows; fix mockWallet fixture
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feat: add centi-cent accrual to eliminate systematic author under-payment
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feat: maintain ledger_totals running totals on purchase
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feat: add global RedisModule providing ioredis REDIS_CLIENT token
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feat: add Redis SETNX edge cache for idempotency in PurchasesService
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fix: delete Redis sentinel when purchase transaction fails
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docs: add ADR-008/009/010 and update architecture docs for scale improvements
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fix: guard zero-amount ledger_totals upserts and platform wallet update
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fix: resolve all PR #12 review items
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refactor: consolidate migration 0002 into 0001
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fix: delete sentinel when post-commit or cold-start cache write fails
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