added coin API WS implementation

core/config.py

@@ -292,4 +292,29 @@ def setup_logging(config: Optional[Config] = None):
     
     log_config = config.logging
     
+    # Add separate error log with rotation and immediate flush
+    try:
+        from logging.handlers import RotatingFileHandler
+        error_log_dir = Path('logs')
+        error_log_dir.mkdir(parents=True, exist_ok=True)
+        error_log_path = error_log_dir / 'errors.log'
+
+        class FlushingErrorHandler(RotatingFileHandler):
+            def emit(self, record):
+                super().emit(record)
+                self.flush()
+
+        error_handler = FlushingErrorHandler(
+            str(error_log_path), maxBytes=10*1024*1024, backupCount=5, encoding='utf-8'
+        )
+        formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
+        error_handler.setFormatter(formatter)
+        error_handler.setLevel(logging.ERROR)
+
+        root_logger = logging.getLogger()
+        root_logger.addHandler(error_handler)
+        logger.info("Error log handler initialized at logs/errors.log")
+    except Exception as e:
+        logger.warning(f"Failed to initialize error log handler: {e}")
+
     logger.info("Logging configured successfully with SafeFormatter")