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

backend/migrations/226_channel_monitor_quota_mode.sql

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+-- Migration: 226_channel_monitor_quota_mode
+-- 渠道监控配额模式：
+--   1. provider 扩容到全部 8 平台（antigravity/kimi/zhipu/deepseek）
+--      （antigravity 仅支持配额模式，无探活 adapter；国产 3 家复用 OpenAI 兼容探活）
+--   2. check_mode：probe（默认，现状探活）/ quota（仅查关联账号用量，零 LLM 成本）
+--      / quota_probe（探活 + 配额并存）
+--   3. account_id 关联已有账号（配额模式的数据源，复用账号侧用量服务）；
+--      账号删除时置空，监控保留并报「账号未关联」
+--   4. channel_monitor_histories.quota 持久化归一化配额快照（JSONB）
+--   5. 新增公开设置 channel_monitor_show_quota（默认关闭）：
+--      控制用户端监控页是否展示配额/余额；管理端始终可见
+
+DO $$
+DECLARE
+    monitor_constraint_def TEXT;
+    template_constraint_def TEXT;
+BEGIN
+    SELECT pg_get_constraintdef(c.oid)
+      INTO monitor_constraint_def
+      FROM pg_constraint c
+      JOIN pg_class t ON t.oid = c.conrelid
+     WHERE t.relname = 'channel_monitors'
+       AND c.conname = 'channel_monitors_provider_check';
+
+    IF monitor_constraint_def IS NULL OR position('kimi' IN monitor_constraint_def) = 0 THEN
+        ALTER TABLE channel_monitors
+            DROP CONSTRAINT IF EXISTS channel_monitors_provider_check;
+        ALTER TABLE channel_monitors
+            ADD CONSTRAINT channel_monitors_provider_check
+            CHECK (provider IN ('openai', 'anthropic', 'gemini', 'grok',
+                                'antigravity', 'kimi', 'zhipu', 'deepseek'));
+    END IF;
+
+    SELECT pg_get_constraintdef(c.oid)
+      INTO template_constraint_def
+      FROM pg_constraint c
+      JOIN pg_class t ON t.oid = c.conrelid
+     WHERE t.relname = 'channel_monitor_request_templates'
+       AND c.conname = 'channel_monitor_request_templates_provider_check';
+
+    IF template_constraint_def IS NULL OR position('kimi' IN template_constraint_def) = 0 THEN
+        ALTER TABLE channel_monitor_request_templates
+            DROP CONSTRAINT IF EXISTS channel_monitor_request_templates_provider_check;
+        ALTER TABLE channel_monitor_request_templates
+            ADD CONSTRAINT channel_monitor_request_templates_provider_check
+            CHECK (provider IN ('openai', 'anthropic', 'gemini', 'grok',
+                                'antigravity', 'kimi', 'zhipu', 'deepseek'));
+    END IF;
+END $$;
+
+ALTER TABLE channel_monitors
+    ADD COLUMN IF NOT EXISTS check_mode VARCHAR(32) NOT NULL DEFAULT 'probe';
+
+ALTER TABLE channel_monitors
+    ADD CONSTRAINT channel_monitors_check_mode_check
+    CHECK (check_mode IN ('probe', 'quota', 'quota_probe'));
+
+ALTER TABLE channel_monitors
+    ADD COLUMN IF NOT EXISTS account_id BIGINT REFERENCES accounts(id) ON DELETE SET NULL;
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitors_account_id ON channel_monitors(account_id);
+
+COMMENT ON COLUMN channel_monitors.check_mode IS
+    'probe = LLM 探活（默认）；quota = 仅查关联账号用量；quota_probe = 探活 + 配额';
+COMMENT ON COLUMN channel_monitors.account_id IS
+    '配额模式关联的账号 ID（数据源）；账号删除时置空';
+
+ALTER TABLE channel_monitor_histories
+    ADD COLUMN IF NOT EXISTS quota JSONB;
+
+COMMENT ON COLUMN channel_monitor_histories.quota IS
+    '配额模式监控的归一化配额快照（domain.MonitorQuotaSnapshot）；探活模式为 NULL';
+
+-- 用户端是否展示配额/余额（默认关闭，fail-closed 解析：仅 "true" 视为开启）。
+-- 管理端不受此开关影响。
+INSERT INTO settings (key, value)
+VALUES ('channel_monitor_show_quota', 'false')
+ON CONFLICT (key) DO NOTHING;