The Function and Tool database columns declare user_id as a nullable
String column, but their Pydantic read-models required a non-null
string. A record with user_id NULL therefore raised a
pydantic ValidationError inside get_functions()/get_tools(), which run
during install_tool_and_function_dependencies() at app startup —
crashing the whole application and blocking all chat completions.
Make user_id Optional in the read/response models so such records
validate gracefully (user is already rendered as None downstream when
the id has no matching user) instead of taking down startup.
Claude-Session: https://claude.ai/code/session_01Y4RRUNq7ZUFkRWbWPkDw3m
Co-authored-by: Claude <noreply@anthropic.com>
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