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

backend/migrations/101_add_account_stats_pricing.sql

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+-- Account statistics pricing: allow channels to configure custom pricing for account cost tracking.
+
+-- 1. Channel-level toggle
+ALTER TABLE channels ADD COLUMN IF NOT EXISTS apply_pricing_to_account_stats BOOLEAN NOT NULL DEFAULT FALSE;
+
+-- 2. Account stats pricing rules (ordered list per channel)
+CREATE TABLE IF NOT EXISTS channel_account_stats_pricing_rules (
+    id BIGSERIAL PRIMARY KEY,
+    channel_id BIGINT NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    name VARCHAR(100) NOT NULL DEFAULT '',
+    group_ids BIGINT[] NOT NULL DEFAULT '{}',
+    account_ids BIGINT[] NOT NULL DEFAULT '{}',
+    sort_order INT NOT NULL DEFAULT 0,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_cas_pricing_rules_channel_id ON channel_account_stats_pricing_rules(channel_id);
+
+-- 3. Model pricing for each rule (same structure as channel_model_pricing)
+CREATE TABLE IF NOT EXISTS channel_account_stats_model_pricing (
+    id BIGSERIAL PRIMARY KEY,
+    rule_id BIGINT NOT NULL REFERENCES channel_account_stats_pricing_rules(id) ON DELETE CASCADE,
+    platform VARCHAR(50) NOT NULL DEFAULT '',
+    models JSONB NOT NULL DEFAULT '[]',
+    billing_mode VARCHAR(20) NOT NULL DEFAULT 'token',
+    input_price NUMERIC(20,10),
+    output_price NUMERIC(20,10),
+    cache_write_price NUMERIC(20,10),
+    cache_read_price NUMERIC(20,10),
+    image_output_price NUMERIC(20,10),
+    per_request_price NUMERIC(20,10),
+    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+CREATE INDEX IF NOT EXISTS idx_cas_model_pricing_rule_id ON channel_account_stats_model_pricing(rule_id);
+
+-- 4. Usage logs: pre-computed account stats cost (NULL = use default formula)
+ALTER TABLE usage_logs ADD COLUMN IF NOT EXISTS account_stats_cost NUMERIC(20,10);