Update td_connect.py (#312)

NathanG-TD · web-flow · commit d7ff9ffabd2b · 2026-05-19T09:23:45.000-07:00
pool_pre_ping=True tells SQLAlchemy to issue a lightweight SELECT 1 before returning any connection from the pool. When a transient Teradata instance restarts, stale pooled connections are detected and
   discarded automatically — the next tool call gets a fresh connection and succeeds without the agent or user seeing any error.  Really useful when using Teradata Trial instances.
diff --git a/src/teradata_mcp_server/tools/td_connect.py b/src/teradata_mcp_server/tools/td_connect.py
@@ -115,6 +115,7 @@ def __init__(self, settings: Optional["Settings"] = None):
                 pool_size=pool_size,
                 max_overflow=max_overflow,
                 pool_timeout=pool_timeout,
+                pool_pre_ping=True,
             )
             logger.info(f"SQLAlchemy engine created for Teradata: {self._base_host}:{self._base_port}/{self._base_db}")
         except Exception as e:

Original file line number	Diff line number	Diff line change
`@@ -115,6 +115,7 @@ def __init__(self, settings: Optional["Settings"] = None):`
`115`	`115`	`pool_size=pool_size,`
`116`	`116`	`max_overflow=max_overflow,`
`117`	`117`	`pool_timeout=pool_timeout,`
	`118`	`+ pool_pre_ping=True,`
`118`	`119`	`)`
`119`	`120`	`logger.info(f"SQLAlchemy engine created for Teradata: {self._base_host}:{self._base_port}/{self._base_db}")`
`120`	`121`	`except Exception as e:`