The migrations runner executes the entire file content in a single transaction, so the Down section DROP statements were being executed immediately after the Up section, causing tables to be created then dropped within the same transaction.
- DB Migration 081: 新增 account_behavior_hourly / account_risk_scores 表 - 行为采集：Gateway/OpenAI Gateway RecordUsage 注入 fire-and-forget CollectBehaviorAsync - SQL 打分引擎：CTE 加权特征向量 → risk_score [0-1]，UPSERT 保留 idle_override - RiskSettings：Redis 缓存 → DB fallback → 默认值（observe 模式） - REST API：/admin/risk/summary|accounts|accounts/:id|settings - 前端：Pinia store + RiskControlView + 6 子组件（donut/radar/line 纯 SVG 图表） - 侧边栏新增 Risk Control 入口（ShieldExclamationIcon） - 反风控优化：移除 Antigravity 后台定时刷新，改为按需刷新避免 idle 封号
