Clickhouse has something similar called clickhouse-obfuscator [1]. It even works offline with data dumps so you can quickly prepare and send somewhat realistic example data to others.
According to its --help output, it is designed to retain the following properties of data:
- cardinalities of values (number of distinct values) for every column and for every tuple of columns;
- conditional cardinalities: number of distinct values of one column under condition on value of another column;
- probability distributions of absolute value of integers; sign of signed integers; exponent and sign for floats;
- probability distributions of length of strings;
- probability of zero values of numbers; empty strings and arrays, NULLs;
- data compression ratio when compressed with LZ77 and entropy family of codecs;
- continuity (magnitude of difference) of time values across table; continuity of floating point values.
- date component of DateTime values;
- UTF-8 validity of string values;
- string values continue to look somewhat natural
[1]: https://clickhouse.com/docs/en/operations/utilities/clickhou...
The Dutch national office of statistics has tools intended to de-identify 'microdata' such that k-anonimity[1] is achieved called mu-argus[2] and tau-argus.
[1] A release of data is said to have the k-anonymity property if the information for each person contained in the release cannot be distinguished from at least k-1 individuals whose information also appear in the release. https://en.wikipedia.org/wiki/K-anonymity [2] https://research.cbs.nl/casc/mu.htm
There's a write up from Alexey of different approaches considered for clickhouse-obfuscator here: https://clickhouse.com/blog/five-methods-of-database-obfusca....
The summary is pretty funny:
> "After trying four methods, I got so tired of this problem that it was time just to choose something, make it into a usable tool, and announce the solution"