diff --git a/server/auth_audit_test.go b/server/auth_audit_test.go
index 5ea0890..0429dcc 100644
--- a/server/auth_audit_test.go
+++ b/server/auth_audit_test.go
@@ -100,6 +100,20 @@ func TestGroupMessageQuerySupportsOperationalFilters(t *testing.T) {
 	}
 }
 
+func TestLoginAuditQuerySpecsExposeUserIDAsString(t *testing.T) {
+	for label, spec := range map[string]*internalQuerySpec{
+		"user-login-logs":    internalTenantResourceSpecs["user-login-logs"],
+		"login-failure-logs": internalTenantResourceSpecs["login-failure-logs"],
+	} {
+		if spec == nil {
+			t.Fatalf("%s query spec missing", label)
+		}
+		if !strings.Contains(spec.Select, "CAST(user_id AS CHAR) AS user_id") {
+			t.Fatalf("%s query must expose 64-bit user IDs as strings: %s", label, spec.Select)
+		}
+	}
+}
+
 func TestUserQuerySupportsKeywordAndUserIDs(t *testing.T) {
 	req := httptest.NewRequest("GET", "/?keyword=alice&user_ids=101,202&account_no=1000", nil)
 	query, countQuery, args, _, _, err := buildInternalAdminListQuery(req, usersInternalQuerySpec(), "")
diff --git a/server/internal_admin_query_resources.go b/server/internal_admin_query_resources.go
index 65d724b..e4e9fdb 100644
--- a/server/internal_admin_query_resources.go
+++ b/server/internal_admin_query_resources.go
@@ -63,12 +63,12 @@ var internalTenantResourceSpecs = map[string]*internalQuerySpec{
 	"private-messages": privateMessagesInternalQuerySpec(),
 	"group-messages":   groupMessagesInternalQuerySpec(),
 	"user-login-logs": {
-		Select: `SELECT id,user_id,username,account_type,account_mask,login_type,event_type,session_id,device_id,platform,app_version,ip,region,user_agent,risk_level,request_id,login_at,logout_at,metadata`,
+		Select: `SELECT id,CAST(user_id AS CHAR) AS user_id,username,account_type,account_mask,login_type,event_type,session_id,device_id,platform,app_version,ip,region,user_agent,risk_level,request_id,login_at,logout_at,metadata`,
 		From:   "FROM im_user_login_logs", DefaultSort: "ORDER BY id DESC", DetailKey: "id",
 		Filters: []internalQueryFilter{{"user_id", "user_id", "=", "uid"}, {"account", "account_mask", "LIKE", "string"}, {"login_type", "login_type", "=", "string"}, {"event_type", "event_type", "=", "string"}, {"platform", "platform", "=", "string"}, {"ip", "ip", "LIKE", "string"}, {"login_at_start", "login_at", ">=", "time"}, {"login_at_end", "login_at", "<=", "time"}},
 	},
 	"login-failure-logs": {
-		Select: `SELECT id,user_id,account_type,account_mask,failure_type,reason,detail,ip,region,device_id,platform,app_version,user_agent,risk_level,risk_action,request_id,attempt_at,metadata`,
+		Select: `SELECT id,CAST(user_id AS CHAR) AS user_id,account_type,account_mask,failure_type,reason,detail,ip,region,device_id,platform,app_version,user_agent,risk_level,risk_action,request_id,attempt_at,metadata`,
 		From:   "FROM im_login_failure_logs", DefaultSort: "ORDER BY id DESC", DetailKey: "id",
 		Filters: []internalQueryFilter{{"user_id", "user_id", "=", "uid"}, {"account", "account_mask", "LIKE", "string"}, {"failure_type", "failure_type", "=", "string"}, {"platform", "platform", "=", "string"}, {"ip", "ip", "LIKE", "string"}, {"attempt_at_start", "attempt_at", ">=", "time"}, {"attempt_at_end", "attempt_at", "<=", "time"}},
 	},