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

backend/migrations/125_add_channel_monitors.sql

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+-- Migration: 125_add_channel_monitors
+-- 渠道监控 MVP：周期性对外部 provider/endpoint/api_key 做模型心跳测试。
+--
+-- 表结构说明：
+--   - channel_monitors        渠道配置表（一行 = 一个监控对象）
+--   - channel_monitor_histories 检测历史明细表（一次检测一个模型 = 一行）
+--
+-- 设计要点：
+--   - api_key_encrypted 列存放 AES-256-GCM 密文（base64），由 service 层加密。
+--   - extra_models 用 JSONB 存储字符串数组，便于扩展（后续可加权重等元数据）。
+--   - history 表通过 ON DELETE CASCADE 自动清理已删除监控的历史。
+--   - (enabled, last_checked_at) 索引服务于调度器扫描“到期需要检测”的监控。
+--   - histories 上 (monitor_id, model, checked_at DESC) 服务用户视图聚合查询；
+--     单独的 (checked_at) 索引服务定期清理 30 天前数据的 DELETE。
+
+CREATE TABLE IF NOT EXISTS channel_monitors (
+    id                BIGSERIAL PRIMARY KEY,
+    name              VARCHAR(100) NOT NULL,
+    provider          VARCHAR(20)  NOT NULL,    -- openai / anthropic / gemini
+    endpoint          VARCHAR(500) NOT NULL,    -- base origin
+    api_key_encrypted TEXT         NOT NULL,    -- AES-256-GCM (base64)
+    primary_model     VARCHAR(200) NOT NULL,
+    extra_models      JSONB        NOT NULL DEFAULT '[]'::jsonb,
+    group_name        VARCHAR(100) NOT NULL DEFAULT '',
+    enabled           BOOLEAN      NOT NULL DEFAULT TRUE,
+    interval_seconds  INT          NOT NULL,
+    last_checked_at   TIMESTAMPTZ,
+    created_by        BIGINT       NOT NULL,
+    created_at        TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    updated_at        TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    CONSTRAINT channel_monitors_provider_check CHECK (provider IN ('openai', 'anthropic', 'gemini')),
+    CONSTRAINT channel_monitors_interval_check CHECK (interval_seconds BETWEEN 15 AND 3600)
+);
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitors_enabled_last_checked
+    ON channel_monitors (enabled, last_checked_at);
+CREATE INDEX IF NOT EXISTS idx_channel_monitors_provider
+    ON channel_monitors (provider);
+CREATE INDEX IF NOT EXISTS idx_channel_monitors_group_name
+    ON channel_monitors (group_name);
+
+CREATE TABLE IF NOT EXISTS channel_monitor_histories (
+    id              BIGSERIAL PRIMARY KEY,
+    monitor_id      BIGINT      NOT NULL REFERENCES channel_monitors(id) ON DELETE CASCADE,
+    model           VARCHAR(200) NOT NULL,
+    status          VARCHAR(20)  NOT NULL,
+    latency_ms      INT,
+    ping_latency_ms INT,
+    message         VARCHAR(500) NOT NULL DEFAULT '',
+    checked_at      TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    CONSTRAINT channel_monitor_histories_status_check
+        CHECK (status IN ('operational', 'degraded', 'failed', 'error'))
+);
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_histories_monitor_model_checked
+    ON channel_monitor_histories (monitor_id, model, checked_at DESC);
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_histories_checked_at
+    ON channel_monitor_histories (checked_at);