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content/docs-mvp/DATA.md

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+# Data Pipeline (Acquisition → Transfer → Storage)
+
+This document mirrors the **/data** page on the website and is meant to be versioned and reviewed.
+
+## Scenario A (default)
+- **Raw 192 kHz audio continuously** when 4G throughput is OK.
+- If throughput is low, use an **adaptive strategy** (compression / denoise / clips / features).
+
+## Acquisition (edge)
+- Sample rate (recommended): **192 kHz**
+- Bit depth: **24-bit**
+- Channels: **mono**
+
+### Raw rate (order of magnitude)
+- 192000 samples/s × 24-bit ≈ **576 kB/s** (~0.56 MB/s)
+- ~**2.0 GB/hour**
+- ~**49 GB/day**
+
+## Transfer (4G)
+- Raw 192 kHz mono 24-bit ≈ **~4.6 Mbps** (payload only, no overhead)
+
+## Storage
+Per station:
+- ~49 GB/day
+- ~343 GB/week
+- ~18 TB/year
+
+## Optimizations (planned as feature branches)
+- `feat/data-compression` (FLAC/Zstd, chunking)
+- `feat/data-downsample` (192k→48k)
+- `feat/data-vad-events` (VAD/events)
+- `feat/data-features-only` (FFT/SPL/peaks only)
+- `feat/data-retention-policy` (retention + aggregation)