Does SQLite3 not support foreign key constraints?

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In SQLite 3.x, you have to make the following query every time you connect to an SQLite database:

PRAGMA foreign_keys = ON;

Otherwise SQLite will ignore all foreign key constraints.

Why every time? Backwards compatibility with SQLite 2.x, according to the the documentation.

In SQLite 4.x, FK constraints will be enabled by default.

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