测试delivery接单后数据获取链路，解决订单地址获取异常bug

mall_sql/migrations/20260528_debug_address.sql

@@ -0,0 +1,66 @@
+-- ============================================
+-- 诊断脚本：定位 delivery 端地址空白问题
+-- 请复制全部内容执行，把结果截图发给我
+-- ============================================
+
+-- 诊断1：确认 delivery_build_order_json 当前版本
+SELECT 
+    proname,
+    CASE 
+        WHEN prosrc LIKE '%NULLIF(p_raw -> ''address_snapshot_json'', ''{}''::jsonb)%' THEN 'FIXED (含 NULLIF 排除空对象)'
+        WHEN prosrc LIKE '%p_raw -> ''address_snapshot''%' THEN 'HAS_FALLBACK 但缺少 NULLIF'
+        ELSE 'NO_FALLBACK (只有 address_snapshot_json)'
+    END AS address_fallback_status,
+    CASE 
+        WHEN prosrc LIKE '%|| jsonb_build_object%' THEN 'SPLIT (小块拼接)'
+        ELSE 'SINGLE_BLOCK (单个大块)'
+    END AS function_structure
+FROM pg_proc 
+WHERE proname = 'delivery_build_order_json';
+
+
+-- 诊断2：查看 ec_care_tasks 最近5条订单的地址数据状态
+SELECT 
+    id,
+    task_no,
+    elder_name,
+    assigned_to,
+    COALESCE(address_snapshot_json::TEXT, 'NULL') AS addr_json_raw,
+    COALESCE(address_snapshot::TEXT, 'NULL') AS addr_snap_raw,
+    CASE 
+        WHEN address_snapshot_json IS NULL THEN 'json_null'
+        WHEN address_snapshot_json = '{}'::jsonb THEN 'json_empty'
+        WHEN address_snapshot_json = 'null'::jsonb THEN 'json_literal_null'
+        ELSE 'json_has_data'
+    END AS json_status,
+    CASE 
+        WHEN address_snapshot IS NULL THEN 'snap_null'
+        WHEN address_snapshot = '{}'::jsonb THEN 'snap_empty'
+        WHEN address_snapshot = 'null'::jsonb THEN 'snap_literal_null'
+        ELSE 'snap_has_data'
+    END AS snap_status
+FROM public.ec_care_tasks
+ORDER BY created_at DESC
+LIMIT 5;
+
+
+-- 诊断3：直接测试 delivery_build_order_json 对最近一条 care 订单的输出
+-- 如果返回的 address 为空字符串，说明函数内部有问题
+SELECT 
+    t.id,
+    t.task_no,
+    delivery_build_order_json(
+        to_jsonb(t),
+        '[]'::jsonb, '[]'::jsonb, '[]'::jsonb, NULL, 'care'
+    ) ->> 'address' AS test_address,
+    delivery_build_order_json(
+        to_jsonb(t),
+        '[]'::jsonb, '[]'::jsonb, '[]'::jsonb, NULL, 'care'
+    ) ->> 'elderGender' AS test_gender,
+    delivery_build_order_json(
+        to_jsonb(t),
+        '[]'::jsonb, '[]'::jsonb, '[]'::jsonb, NULL, 'care'
+    ) ->> 'elderAge' AS test_age
+FROM public.ec_care_tasks t
+ORDER BY t.created_at DESC
+LIMIT 1;