Add retry limit and exponential backoff for ActiveRecord::SerializationFailure

[Copilot]

Addresses feedback from PR #63 about infinite retry loops in serialization failure handling.

Changes

• Added retry limit: Maximum 3 attempts before raising exception
• Exponential backoff: 0.2s, 0.4s, 0.8s between retries to reduce contention
• Enhanced logging: Warns on retry attempts, errors on final failure

rescue ActiveRecord::SerializationFailure => e
  attempts += 1
  if attempts <= max_retries
    sleep_time = 0.2 * (2 ** (attempts - 1))
    Rails.logger.warn("Retry #{attempts}/#{max_retries} after serialization failure: #{e.message}")
    sleep(sleep_time)
    retry
  else
    Rails.logger.error("Query failed after #{max_retries} retries: #{e.message}")
    raise
  end
end

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