Add synthetic test dataset

README.md

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+---
+license: cc0-1.0
+tags:
+- synthetic
+- test-data
+size_categories:
+- n<1K
+---
+
+# just-roof-7a76e5
+
+Synthetic products test data: 41 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
+885d08db127d05bc,1,true,146.85,119
+885d08db127d05bc,2,true,99.91,239
+885d08db127d05bc,3,true,68.58,249
+885d08db127d05bc,4,true,14.37,48
+885d08db127d05bc,5,true,4.74,131
+885d08db127d05bc,6,true,486.34,376
+885d08db127d05bc,7,true,419.77,287
+885d08db127d05bc,8,true,450.17,114
+885d08db127d05bc,9,true,326.34,475
+885d08db127d05bc,10,true,381.05,35
+885d08db127d05bc,11,true,137.7,396
+885d08db127d05bc,12,true,209.09,482
+885d08db127d05bc,13,true,155.9,475
+885d08db127d05bc,14,true,491.01,357
+885d08db127d05bc,15,true,7.92,385
+885d08db127d05bc,16,true,341.17,48
+885d08db127d05bc,17,true,386.72,459
+885d08db127d05bc,18,true,61.49,242
+885d08db127d05bc,19,true,398.04,500
+885d08db127d05bc,20,true,388.4,26
+885d08db127d05bc,21,true,245.79,146
+885d08db127d05bc,22,true,284.54,459
+885d08db127d05bc,23,true,259.45,1
+885d08db127d05bc,24,true,74.31,160
+885d08db127d05bc,25,true,62.62,384
+885d08db127d05bc,26,true,173.95,10
+885d08db127d05bc,27,true,457.29,262
+885d08db127d05bc,28,true,168.55,219
+885d08db127d05bc,29,true,54.71,467
+885d08db127d05bc,30,true,177.26,417
+885d08db127d05bc,31,true,494.25,245
+885d08db127d05bc,32,true,421.78,26
+885d08db127d05bc,33,true,251.48,220
+885d08db127d05bc,34,true,377.16,209
+885d08db127d05bc,35,true,345.33,264
+885d08db127d05bc,36,true,50.29,328
+885d08db127d05bc,37,true,145.24,2
+885d08db127d05bc,38,true,66.08,274
+885d08db127d05bc,39,true,107.86,149
+885d08db127d05bc,40,true,119.29,118
+885d08db127d05bc,41,true,179.55,171