Simplify connection registry

src/connection_registry.hpp

@@ -15,14 +15,6 @@ class Connection;
  * allocate a large virtual address space efficiently, with physical memory
  * allocated on-demand as connections are created.
  *
- * CRITICAL ORDERING REQUIREMENT:
- * All connection cleanup MUST follow this exact sequence:
- * 1. Remove from registry: auto conn = registry.remove(fd)
- * 2. Delete the connection: unique_ptr destructor handles it automatically
- *
- * This ordering prevents race conditions between cleanup and fd reuse.
- * The unique_ptr interface ensures ownership is always clear and prevents
- * double-delete bugs.
  */
 class ConnectionRegistry {
 public:
@@ -48,14 +40,6 @@ public:
    */
   void store(int fd, std::unique_ptr<Connection> connection);
 
-  /**
-   * Check if a connection exists in the registry by file descriptor.
-   *
-   * @param fd File descriptor
-   * @return true if connection exists, false otherwise
-   */
-  bool has(int fd) const;
-
   /**
    * Remove a connection from the registry and transfer ownership to caller.
    * This transfers ownership via unique_ptr move semantics.
@@ -72,15 +56,6 @@ public:
    */
   size_t max_fds() const { return max_fds_; }
 
-  /**
-   * Perform graceful shutdown cleanup.
-   * Iterates through all registry entries and cleans up any remaining
-   * connections using the critical ordering: remove -> close -> delete.
-   *
-   * This method is called during server shutdown to ensure no connections leak.
-   */
-  virtual void shutdown_cleanup();
-
   // Non-copyable and non-movable
   ConnectionRegistry(const ConnectionRegistry &) = delete;
   ConnectionRegistry &operator=(const ConnectionRegistry &) = delete;
@@ -90,4 +65,5 @@ public:
 private:
   Connection **connections_; ///< mmap'd array of raw connection pointers
   size_t max_fds_;           ///< Maximum file descriptor limit
-};
+  size_t aligned_size_;      ///< Page-aligned size for munmap
+};