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docs: add compression notes back

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vee1e 2025-09-02 03:10:39 +05:30
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@ -523,6 +523,27 @@ tail -f logs/app.log
5. Add tests for new functionality
6. Use meaningful commit messages
# Why you don't do compression with XLS/XLSX files
XLS and XLSX files are already compressed formats (especially XLSX, which is a ZIP archive of XML files). Applying additional co
pression (like gzip) typically results in minimal size reduction—often less than 3%. This extra step adds processing overhead wi
hout significant storage or transfer benefits. In most cases, it's more efficient to transfer these files as-is.
## Compression Metrics for XLSX Files
| File Name | Compressed Size (bytes) | Decompressed Size (bytes) | Compression Ratio | Bytes Saved |
|-------------------------|-------------------------|----------------------------|-------------------|-------------|
| `valid_form_07.xlsx.gz` | 37,009 | 37,973 | 2.5% | 964 |
| `valid_form_08.xlsx.gz` | 38,975 | 40,021 | 2.6% | 1,046 |
| `valid_form_09.xlsx.gz` | 37,341 | 38,420 | 2.8% | 1,079 |
| `valid_form_10.xlsx.gz` | 37,269 | 38,208 | 2.5% | 939 |
**Observation:**
The compression ratios are very low (2.5%–2.8%), saving only about 939–1,079 bytes per file. This demonstrates that compressing
LSX files provides negligible space savings.
To put this in perspective, this required refactoring half the codebase with over 5,000 changed lines of code.
## License
MIT License - see LICENSE file for details.