Add environment variable for proxy path (#52)

Author: maruthgoyal

mcp_clickhouse/mcp_env.py

@@ -28,6 +28,7 @@ class ClickHouseConfig:
         CLICKHOUSE_CONNECT_TIMEOUT: Connection timeout in seconds (default: 30)
         CLICKHOUSE_SEND_RECEIVE_TIMEOUT: Send/receive timeout in seconds (default: 300)
         CLICKHOUSE_DATABASE: Default database to use (default: None)
+        CLICKHOUSE_PROXY_PATH: Path to be added to the host URL. For instance, for servers behind an HTTP proxy (default: None)
     """
 
     def __init__(self):
@@ -96,6 +97,10 @@ def send_receive_timeout(self) -> int:
         Default: 300 (ClickHouse default)
         """
         return int(os.getenv("CLICKHOUSE_SEND_RECEIVE_TIMEOUT", "300"))
+    
+    @property
+    def proxy_path(self) -> str:
+        return os.getenv("CLICKHOUSE_PROXY_PATH")
 
     def get_client_config(self) -> dict:
         """Get the configuration dictionary for clickhouse_connect client.
@@ -118,6 +123,9 @@ def get_client_config(self) -> dict:
         # Add optional database if set
         if self.database:
             config["database"] = self.database
+        
+        if self.proxy_path:
+            config["proxy_path"] = self.proxy_path
 
         return config