Internal Tag Historian External Access

Is the internal tag historian an SQL database? Which one?
Is there any way to access the internal tag historian database from an external application?

IIRC, it is SQLite. Ignition holds the file open, so it is not accessible externally while Ignition is running. (SQLite is single-threaded, single-user technology.)

If you need simultaneous access, use a “real” database.

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That’s what I suspected, otherwise people would work around the Tag Historian module to avoid the cost.

You can implement an API via WebDev if you must. Internal queries will be done one at a time correctly.