diff --git a/AGENTS.md b/AGENTS.md
deleted file mode 100644
index 99e1f981..00000000
--- a/AGENTS.md
+++ /dev/null
@@ -1,25 +0,0 @@
-<!-- OPENSPEC:START -->
-# OpenSpec Instructions
-
-These instructions are for AI assistants working in this project.
-
-Always open `@/openspec/AGENTS.md` when the request:
-- Mentions planning or proposals (words like proposal, spec, change, plan)
-- Introduces new capabilities, breaking changes, architecture shifts, or big performance/security work
-- Sounds ambiguous and you need the authoritative spec before coding
-
-Use `@/openspec/AGENTS.md` to learn:
-- How to create and apply change proposals
-- Spec format and conventions
-- Project structure and guidelines
-
-Keep this managed block so 'openspec update' can refresh the instructions.
-
-<!-- OPENSPEC:END -->
-
-## 强制语言规范
-
-以下为强制规定：
-- 与用户交流一律使用中文。
-- 代码文档与代码注释一律使用中文。
-- OpenSpec 提案与相关说明一律使用中文。
diff --git a/backend/internal/repository/account_repo.go b/backend/internal/repository/account_repo.go
index 19dff447..aa880269 100644
--- a/backend/internal/repository/account_repo.go
+++ b/backend/internal/repository/account_repo.go
@@ -334,7 +334,7 @@ func (r *accountRepository) BatchUpdateLastUsed(ctx context.Context, updates map
 
 	idx := 1
 	for id, ts := range updates {
-		caseSQL += " WHEN $" + itoa(idx) + " THEN $" + itoa(idx+1)
+		caseSQL += " WHEN $" + itoa(idx) + " THEN $" + itoa(idx+1) + "::timestamptz"
 		args = append(args, id, ts)
 		ids = append(ids, id)
 		idx += 2
diff --git a/backend/internal/service/account_test_service.go b/backend/internal/service/account_test_service.go
index 3223eb18..de6bc7dd 100644
--- a/backend/internal/service/account_test_service.go
+++ b/backend/internal/service/account_test_service.go
@@ -335,7 +335,7 @@ func (s *AccountTestService) testOpenAIAccountConnection(c *gin.Context, account
 		if baseURL == "" {
 			baseURL = "https://api.openai.com"
 		}
-		apiURL = strings.TrimSuffix(baseURL, "/") + "/v1/responses"
+		apiURL = strings.TrimSuffix(baseURL, "/") + "/responses"
 	} else {
 		return s.sendErrorAndEnd(c, fmt.Sprintf("Unsupported account type: %s", account.Type))
 	}
diff --git a/backend/internal/service/openai_gateway_service.go b/backend/internal/service/openai_gateway_service.go
index 79801b29..2bb0bee8 100644
--- a/backend/internal/service/openai_gateway_service.go
+++ b/backend/internal/service/openai_gateway_service.go
@@ -371,7 +371,7 @@ func (s *OpenAIGatewayService) buildUpstreamRequest(ctx context.Context, c *gin.
 		// API Key accounts use Platform API or custom base URL
 		baseURL := account.GetOpenAIBaseURL()
 		if baseURL != "" {
-			targetURL = baseURL + "/v1/responses"
+			targetURL = baseURL + "/responses"
 		} else {
 			targetURL = openaiPlatformAPIURL
 		}
diff --git a/build_image.sh b/build_image.sh
old mode 100755
new mode 100644