-- 代理管理面查询（T-P7）：参数化语句，由 routes.py 按名读取执行（占位符 ?）
-- 命名约定：-- name: <键>

-- name: stats_since
SELECT bucket, gateway_cached, in_hit_tok, in_miss_tok,
       charged_milli, upstream_cost_milli
  FROM usage_ledger WHERE ts >= ? LIMIT ?;

-- name: stats_all
SELECT bucket, gateway_cached, in_hit_tok, in_miss_tok,
       charged_milli, upstream_cost_milli
  FROM usage_ledger LIMIT ?;

-- name: usage_page
SELECT u.* FROM usage_ledger u
  LEFT JOIN proxy_keys k ON k.id = u.key_id
 WHERE (? IS NULL OR k.student_id = ?)
 ORDER BY u.ts DESC LIMIT ? OFFSET ?;

-- name: students
SELECT * FROM students ORDER BY id;