-- ========================================
-- 修复重复的外键约束问题
-- ========================================
-- 问题：evaluation_point_groups_id 列有两个外键约束，导致 PostgREST 嵌套查询失败

-- 步骤 1: 删除旧的外键约束
ALTER TABLE evaluation_points
DROP CONSTRAINT IF EXISTS fk_evaluation_points_group;

-- 步骤 2: 验证删除结果（应该只剩下 2 个外键）
SELECT
    tc.constraint_name AS "约束名",
    kcu.column_name AS "列名",
    ccu.table_name AS "引用表",
    ccu.column_name AS "引用列"
FROM information_schema.table_constraints AS tc
JOIN information_schema.key_column_usage AS kcu
    ON tc.constraint_name = kcu.constraint_name
JOIN information_schema.constraint_column_usage AS ccu
    ON ccu.constraint_name = tc.constraint_name
WHERE tc.constraint_type = 'FOREIGN KEY'
    AND tc.table_name = 'evaluation_points'
    AND kcu.column_name IN ('evaluation_point_groups_id', 'evaluation_point_groups_pid')
ORDER BY kcu.column_name;

-- 预期结果（应该只有 2 个外键）：
-- 约束名                                    | 列名                          | 引用表                    | 引用列
-- ------------------------------------------|-------------------------------|---------------------------|-------
-- fk_evaluation_points_child_group         | evaluation_point_groups_id    | evaluation_point_groups   | id
-- fk_evaluation_points_parent_group        | evaluation_point_groups_pid   | evaluation_point_groups   | id