暂存一下,防止丢失

migrations/000171_add_agent_main_wallet_credit.down.sql

@@ -0,0 +1,60 @@
+BEGIN;
+
+LOCK TABLE tb_agent_wallet IN ACCESS EXCLUSIVE MODE;
+
+-- 出现信用配置、负余额或信用占用后，旧逻辑已无法安全解释资金事实，禁止回滚。
+DO $$
+DECLARE
+    unsafe_count bigint;
+BEGIN
+    SELECT COUNT(*)
+      INTO unsafe_count
+      FROM tb_agent_wallet
+     WHERE credit_enabled
+        OR credit_limit <> 0
+        OR balance < 0
+        OR frozen_balance > balance;
+
+    IF unsafe_count > 0 THEN
+        RAISE EXCEPTION '已有 % 个钱包产生信用配置或旧逻辑无法解释的资金事实，禁止回滚信用字段，请清偿后再评估', unsafe_count;
+    END IF;
+END
+$$;
+
+DROP INDEX IF EXISTS idx_agent_wallet_main_credit_enabled;
+
+ALTER TABLE tb_agent_wallet
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_credit_config,
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_credit_scope,
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_frozen_nonnegative,
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_arithmetic_range,
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_available_balance,
+    DROP CONSTRAINT IF EXISTS chk_agent_wallet_version_nonnegative,
+    DROP COLUMN IF EXISTS credit_enabled,
+    DROP COLUMN IF EXISTS credit_limit;
+
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_constraint
+         WHERE conrelid = 'tb_agent_wallet'::regclass
+           AND conname = 'chk_agent_wallet_balance'
+    ) THEN
+        ALTER TABLE tb_agent_wallet
+            ADD CONSTRAINT chk_agent_wallet_balance CHECK (balance >= 0);
+    END IF;
+
+    IF NOT EXISTS (
+        SELECT 1 FROM pg_constraint
+         WHERE conrelid = 'tb_agent_wallet'::regclass
+           AND conname = 'chk_agent_wallet_frozen_balance'
+    ) THEN
+        ALTER TABLE tb_agent_wallet
+            ADD CONSTRAINT chk_agent_wallet_frozen_balance CHECK (
+                frozen_balance >= 0 AND frozen_balance <= balance
+            );
+    END IF;
+END
+$$;
+
+COMMIT;