Are there any MQL5 native libraries for ZeroMQ, MySQL, PostgreSQL?
Nope! Unfortunately! Just for SQLite, since February, 2020. And it is absolutely necessary a real multiuser database for MQL5, like PostgreSQL. It would transform completely the trading robots architecture, a new and far more effective way of thinking them. It is uncompreensible why @MetaQuotes Support doesn't implement it yet!

SQLite: Native handling of SQL databases in MQL5
- www.mql5.com
The development of trading strategies is associated with handling large amounts of data. Now, you are able to work with databases using SQL queries based on SQLite directly in MQL5. An important feature of this engine is that the entire database is placed in a single file located on a user's PC.

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- Economic news for exploring financial markets
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