Production error: ActiveRecord::RecordInvalid: Validation failed: Route can't be blank occurs when RailsPulse middleware encounters requests with blank paths or methods (malformed requests, edge cases).

Root Cause

RailsPulse::Middleware::RequestCollector#find_or_create_route calls find_or_create_by(method:, path:) without validating inputs. The Route model requires both fields present, raising an exception that crashes the middleware chain.

Changes

Monkey-patch find_or_create_route in config/initializers/rails_pulse_fixes.rb to:

• Return nil for blank path/method before database operations
• Rescue ActiveRecord::RecordInvalid to prevent middleware crashes
• Log errors with sanitized paths (strip query params, truncate to 100 chars)

The existing middleware already handles nil routes gracefully via the if route guard at line 46 in request_collector.rb.

def find_or_create_route(req)
  method = req.request_method
  path = req.path

  return nil if path.blank? || method.blank?

  RailsPulse::Route.find_or_create_by(method: method, path: path)
rescue ActiveRecord::RecordInvalid => e
  sanitized_path = path.to_s.split('?').first.truncate(100)
  Rails.logger.error "[RailsPulse] Failed to find or create route: #{e.message} (method: #{method}, path: #{sanitized_path})"
  nil
end

• Fixes [Identity Vault/production] ActiveRecord::RecordInvalid: Validation failed: Route can't be blank #128

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