update

backend/app/db/sql/002_governance.sql

@@ -127,3 +127,16 @@ INSERT INTO roles (id, name, display_name, permissions, create_time) VALUES
     ('role_operator','operator','操作员', '["dashboard","fine-tune","model-eval","model-inference","model-manage","dataset","data-process","data-convert","compute","hardware","logs"]', '2026-01-01T00:00:00Z'),
     ('role_viewer',  'viewer',  '访客',   '["dashboard"]', '2026-01-01T00:00:00Z')
 ON CONFLICT (name) DO NOTHING;
+
+-- 登录会话：采集每次登录/登出，用于统计在线/登录时长
+CREATE TABLE IF NOT EXISTS sessions (
+    id            TEXT PRIMARY KEY,
+    user_id       TEXT NOT NULL,
+    username      TEXT NOT NULL,
+    display_name  TEXT,
+    role          TEXT,
+    login_at      TEXT NOT NULL,
+    logout_at     TEXT,
+    duration_seconds INTEGER,
+    create_time   TEXT NOT NULL
+);