Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting in various files including http.py, language.py, logger.py, safe_exec.py, and SQL migration scripts.
- Consolidated import statements and removed unnecessary blank lines.
- Updated logging configuration for better clarity.
- Enhanced the safe execution code with improved error handling and logging.
- Removed commented-out code and unnecessary variables in backfill_zero_trades.py and other scripts.
- Added a pyproject.toml for Ruff and Vulture configuration.
- Introduced requirements-dev.txt for development dependencies.
- Removed commented-out stock entries in init.sql for cleaner migration scripts.

backend_api_python/app/utils/logger.py

@@ -1,6 +1,7 @@
 """
 Logging utilities (local-only friendly).
 """
+
 import logging
 import os
 from logging.handlers import RotatingFileHandler
@@ -8,35 +9,32 @@ from logging.handlers import RotatingFileHandler
 
 def setup_logger():
     """Configure global logs"""
-    log_level = os.getenv('LOG_LEVEL', 'INFO')
-    log_format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s'
-    
-    logging.basicConfig(
-        level=getattr(logging, log_level.upper()),
-        format=log_format
-    )
-    
+    log_level = os.getenv("LOG_LEVEL", "INFO")
+    log_format = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
+
+    logging.basicConfig(level=getattr(logging, log_level.upper()), format=log_format)
+
     # Filter werkzeug's INFO level logs (reduce noise)
     # Only keep WARNING and above levels
-    werkzeug_logger = logging.getLogger('werkzeug')
+    werkzeug_logger = logging.getLogger("werkzeug")
     werkzeug_logger.setLevel(logging.WARNING)
-    
+
     # Filter INFO level logs for kline routes (reduce noise)
     # Only keep WARNING and above levels
-    kline_logger = logging.getLogger('app.routes.kline')
+    kline_logger = logging.getLogger("app.routes.kline")
     kline_logger.setLevel(logging.WARNING)
-    
+
     # Create log directory
-    log_dir = 'logs'
+    log_dir = "logs"
     if not os.path.exists(log_dir):
         os.makedirs(log_dir)
-    
+
     # Add file handler
     file_handler = RotatingFileHandler(
-        os.path.join(log_dir, 'app.log'),
-        maxBytes=10*1024*1024,  # 10MB
+        os.path.join(log_dir, "app.log"),
+        maxBytes=10 * 1024 * 1024,  # 10MB
         backupCount=5,
-        encoding='utf-8'
+        encoding="utf-8",
     )
     file_handler.setFormatter(logging.Formatter(log_format))
     logging.getLogger().addHandler(file_handler)
@@ -45,12 +43,11 @@ def setup_logger():
 def get_logger(name: str) -> logging.Logger:
     """
     Get the logger with the specified name
-    
+
     Args:
         name: logger name
-        
+
     Returns:
         Logger instance
     """
     return logging.getLogger(name)
-