feat(pricing): implement 4-tier pricing engine and idempotent migration (Fixes #1) [0x3AD489c09A5C750b29155B0d0426Fc70654D59e5] - #97
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Fixes #1
Summary of Implementation
src/pricing/tier-engine.ts): ImplementsgetTierPrice(callCount, priorityFlag)and snake_case aliasget_tier_pricewith 4 tiers (Tier 1: 1–50 @ $0.00, Tier 2: 51–500 @ $0.01, Tier 3: 501+ @ $0.03, Tier 4: Priority @ $0.10) andcalculateBatchCost.migrations/add_tiered_pricing.sql): Idempotent migration addingtiercolumn with CHECK constraint and seedingpricing_tierstable.tests/pricing.test.ts): Comprehensive test suite verifying tier bounds, priority override, snake_case alias, and multi-tier batch calculations.Contributor Wallet (Base USDC / EVM):
0x3AD489c09A5C750b29155B0d0426Fc70654D59e5