little statement_cache test changes

source/orm/sql/statement_cache.cpp

@@ -9,13 +9,7 @@
 namespace matador::sql {
 namespace internal {
 class statement_cache_proxy final : public statement_proxy {
-public:
-  struct retry_config {
-    size_t max_attempts{10};
-    std::chrono::milliseconds initial_wait{10};
-    std::chrono::milliseconds max_wait{250};
-  };
-
+private:
   struct execution_metrics {
     std::chrono::steady_clock::time_point lock_attempt_start;
     std::chrono::steady_clock::time_point lock_acquired{};
@@ -24,6 +18,13 @@ public:
     size_t lock_attempts{0};
   };
 
+public:
+  struct retry_config {
+    size_t max_attempts{10};
+    std::chrono::milliseconds initial_wait{10};
+    std::chrono::milliseconds max_wait{250};
+  };
+
   statement_cache_proxy(utils::message_bus &bus, std::unique_ptr<statement_impl>&& stmt, connection_pool &pool, const size_t connection_id)
   : statement_proxy(std::move(stmt))
   , pool_(pool)
@@ -48,7 +49,6 @@ public:
       bus_.publish(statement_lock_acquired_event{query, now, now - metrics.lock_attempt_start});
 
       auto guard = statement_guard(*this);
-      metrics.execution_start = std::chrono::steady_clock::now();
       if (const auto conn = pool_.acquire(connection_id_); !conn.valid()) {
         return utils::failure(utils::error{
           error_code::EXECUTE_FAILED,
@@ -56,6 +56,7 @@ public:
         });
       }
 
+      metrics.execution_start = std::chrono::steady_clock::now();
       auto execution_result = statement_->execute(bindings);
       metrics.execution_end = std::chrono::steady_clock::now();