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

backend/migrations/086_channel_platform_pricing.sql

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+-- 086_channel_platform_pricing.sql
+-- 渠道按平台维度：model_pricing 加 platform 列，model_mapping 改为嵌套格式
+
+-- 1. channel_model_pricing 加 platform 列
+ALTER TABLE channel_model_pricing
+    ADD COLUMN IF NOT EXISTS platform VARCHAR(50) NOT NULL DEFAULT 'anthropic';
+
+CREATE INDEX IF NOT EXISTS idx_channel_model_pricing_platform
+    ON channel_model_pricing (platform);
+
+-- 2. model_mapping: 从扁平 {"src":"dst"} 迁移为嵌套 {"anthropic":{"src":"dst"}}
+-- 仅迁移非空、非 '{}' 的旧格式数据（通过检查第一个 value 是否为字符串来判断是否为旧格式）
+UPDATE channels
+SET model_mapping = jsonb_build_object('anthropic', model_mapping)
+WHERE model_mapping IS NOT NULL
+  AND model_mapping::text NOT IN ('{}', 'null', '')
+  AND NOT EXISTS (
+      SELECT 1 FROM jsonb_each(model_mapping) AS kv
+      WHERE jsonb_typeof(kv.value) = 'object'
+      LIMIT 1
+  );