Sub2API v1.0 - AI API 网关（二开初始版本，基于上游 Wei-Shaw/sub2api）

backend/migrations/054_drop_legacy_cache_columns.sql

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+-- Drop legacy cache token columns that lack the underscore separator.
+-- These were created by GORM's automatic snake_case conversion:
+--   CacheCreation5mTokens → cache_creation5m_tokens  (incorrect)
+--   CacheCreation1hTokens → cache_creation1h_tokens  (incorrect)
+--
+-- The canonical columns are:
+--   cache_creation_5m_tokens  (defined in 001_init.sql)
+--   cache_creation_1h_tokens  (defined in 001_init.sql)
+--
+-- Migration 009 already copied data from legacy → canonical columns.
+-- This migration drops the legacy columns to avoid confusion.
+
+ALTER TABLE usage_logs DROP COLUMN IF EXISTS cache_creation5m_tokens;
+ALTER TABLE usage_logs DROP COLUMN IF EXISTS cache_creation1h_tokens;