Drop raw text storage in sigmets

[deepsource-io[bot]]

Here's the code health analysis summary for commits 15e2467..b28111c. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success		View Check ↗

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.41%. Comparing base (15e2467) to head (b28111c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #929 +/- ## ======================================= Coverage 98.41% 98.41% ======================================= Files 79 79 Lines 9773 9773 ======================================= Hits 9618 9618 Misses 155 155 ```

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