Add synthetic test dataset

README.md

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+---
+license: cc0-1.0
+tags:
+- synthetic
+- test-data
+size_categories:
+- n<1K
+---
+
+# necessary-register-376bb7
+
+Synthetic products test data: 54 rows in `data.csv`.
+
+All values are randomly generated fictional examples, not real observations, products, or user activity. Intended only for CSV loading and pipeline tests; not suitable for scientific or business conclusions. Columns are sampled independently and do not model real-world correlations.
+
+## Fields
+
+- `sample_id`: random identifier for this generated sample.
+- `row_id`: sequential row number starting at 1.
+- `is_synthetic`: always true.
+- `price_usd`, `stock_units`: simulated values in the units named in each column.

data.csv

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+sample_id,row_id,is_synthetic,price_usd,stock_units
+689f3b7808f41ea7,1,true,411.8,218
+689f3b7808f41ea7,2,true,302.26,388
+689f3b7808f41ea7,3,true,453.23,187
+689f3b7808f41ea7,4,true,448.93,103
+689f3b7808f41ea7,5,true,252.8,102
+689f3b7808f41ea7,6,true,373.59,276
+689f3b7808f41ea7,7,true,443.94,175
+689f3b7808f41ea7,8,true,339.21,233
+689f3b7808f41ea7,9,true,289.92,354
+689f3b7808f41ea7,10,true,485.53,169
+689f3b7808f41ea7,11,true,17.79,8
+689f3b7808f41ea7,12,true,446.97,391
+689f3b7808f41ea7,13,true,317.92,436
+689f3b7808f41ea7,14,true,11.33,197
+689f3b7808f41ea7,15,true,243.79,12
+689f3b7808f41ea7,16,true,322.57,421
+689f3b7808f41ea7,17,true,21.68,30
+689f3b7808f41ea7,18,true,230.52,338
+689f3b7808f41ea7,19,true,488.59,142
+689f3b7808f41ea7,20,true,79.79,308
+689f3b7808f41ea7,21,true,456.86,192
+689f3b7808f41ea7,22,true,308.8,111
+689f3b7808f41ea7,23,true,341.28,286
+689f3b7808f41ea7,24,true,87.25,101
+689f3b7808f41ea7,25,true,160.44,26
+689f3b7808f41ea7,26,true,63.43,22
+689f3b7808f41ea7,27,true,326.48,280
+689f3b7808f41ea7,28,true,47.29,342
+689f3b7808f41ea7,29,true,173.15,470
+689f3b7808f41ea7,30,true,275.58,478
+689f3b7808f41ea7,31,true,228.24,146
+689f3b7808f41ea7,32,true,94.69,108
+689f3b7808f41ea7,33,true,309.32,71
+689f3b7808f41ea7,34,true,203.41,260
+689f3b7808f41ea7,35,true,357.98,398
+689f3b7808f41ea7,36,true,180.86,474
+689f3b7808f41ea7,37,true,281.49,232
+689f3b7808f41ea7,38,true,234.67,353
+689f3b7808f41ea7,39,true,354.34,32
+689f3b7808f41ea7,40,true,239.09,74
+689f3b7808f41ea7,41,true,48.85,448
+689f3b7808f41ea7,42,true,444.41,291
+689f3b7808f41ea7,43,true,53.24,334
+689f3b7808f41ea7,44,true,239.51,206
+689f3b7808f41ea7,45,true,80.63,395
+689f3b7808f41ea7,46,true,59.98,422
+689f3b7808f41ea7,47,true,324.12,7
+689f3b7808f41ea7,48,true,137.62,422
+689f3b7808f41ea7,49,true,383.27,288
+689f3b7808f41ea7,50,true,51.44,296
+689f3b7808f41ea7,51,true,288.0,180
+689f3b7808f41ea7,52,true,221.05,463
+689f3b7808f41ea7,53,true,185.32,398
+689f3b7808f41ea7,54,true,471.38,427