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

backend/migrations/126_add_channel_monitor_aggregation.sql

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+-- Migration: 126_add_channel_monitor_aggregation
+-- 渠道监控日聚合：把 channel_monitor_histories 的明细按天聚合，明细只保留 1 天，
+-- 聚合保留 30 天。明细和聚合表都用软删除（deleted_at），由 ops cleanup 任务每天
+-- 凌晨随运维监控清理一起跑（共享 cron）。
+--
+-- 设计要点：
+--   - channel_monitor_histories 加 deleted_at 软删除字段（SoftDeleteMixin 全局
+--     Hook 会把 DELETE 自动改写成 UPDATE deleted_at = NOW()）。
+--   - channel_monitor_daily_rollups 按 (monitor_id, model, bucket_date) 唯一，
+--     用 ON CONFLICT DO UPDATE 实现幂等回填，状态分布和延迟分子分母都保留，
+--     方便后续按窗口任意求加权可用率和均值。
+--   - watermark 表只有一行（id=1），记录最近一次聚合到达的日期，避免重启后重复
+--     扫全表。
+--   - rollup 上 (bucket_date) 索引服务清理任务的 DELETE WHERE bucket_date < cutoff。
+
+-- 1) 给历史明细表加软删除字段
+ALTER TABLE channel_monitor_histories
+    ADD COLUMN IF NOT EXISTS deleted_at TIMESTAMPTZ;
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_histories_deleted_at
+    ON channel_monitor_histories (deleted_at);
+
+-- 2) 创建日聚合表
+CREATE TABLE IF NOT EXISTS channel_monitor_daily_rollups (
+    id                    BIGSERIAL PRIMARY KEY,
+    monitor_id            BIGINT       NOT NULL REFERENCES channel_monitors(id) ON DELETE CASCADE,
+    model                 VARCHAR(200) NOT NULL,
+    bucket_date           DATE         NOT NULL,
+    total_checks          INT          NOT NULL DEFAULT 0,
+    ok_count              INT          NOT NULL DEFAULT 0,
+    operational_count     INT          NOT NULL DEFAULT 0,
+    degraded_count        INT          NOT NULL DEFAULT 0,
+    failed_count          INT          NOT NULL DEFAULT 0,
+    error_count           INT          NOT NULL DEFAULT 0,
+    sum_latency_ms        BIGINT       NOT NULL DEFAULT 0,
+    count_latency         INT          NOT NULL DEFAULT 0,
+    sum_ping_latency_ms   BIGINT       NOT NULL DEFAULT 0,
+    count_ping_latency    INT          NOT NULL DEFAULT 0,
+    computed_at           TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    deleted_at            TIMESTAMPTZ
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_channel_monitor_daily_rollups_unique
+    ON channel_monitor_daily_rollups (monitor_id, model, bucket_date);
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_daily_rollups_bucket
+    ON channel_monitor_daily_rollups (bucket_date);
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_daily_rollups_deleted_at
+    ON channel_monitor_daily_rollups (deleted_at);
+
+-- 3) 创建 watermark 表（单行：id=1）
+CREATE TABLE IF NOT EXISTS channel_monitor_aggregation_watermark (
+    id                   INT          PRIMARY KEY DEFAULT 1,
+    last_aggregated_date DATE,
+    updated_at           TIMESTAMPTZ  NOT NULL DEFAULT NOW(),
+    CONSTRAINT channel_monitor_aggregation_watermark_singleton CHECK (id = 1)
+);
+
+INSERT INTO channel_monitor_aggregation_watermark (id, last_aggregated_date, updated_at)
+VALUES (1, NULL, NOW())
+ON CONFLICT (id) DO NOTHING;