The backend was always trying to parse tool_input as JSON, which
failed for UserPromptSubmit events that contain plain text prompts.
This caused 500 errors when creating or fetching UserPromptSubmit events.
Fixed by adding try-except blocks that gracefully handle both JSON
and plain text tool_input values.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>