all in

database/fix_duplicate_foreign_keys.sql

@@ -0,0 +1,30 @@
+-- ========================================
+-- 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