SQLite keeps the foreign keys setting per connection, and the server
turned it on once with a PRAGMA. A query cancelled while it runs makes
the pool replace its only connection, and the new one ran without
foreign keys until a restart.
connect now adds `_pragma=foreign_keys(1)` to the database URL. The
driver runs it on every connection it opens. The server refuses to
start when DBURL sets foreign_keys itself, because the driver sorts
the pragmas and that one could win.
One test cancels a query and checks, with a TEMP table, that the
connection was replaced and that foreign keys are on. Another checks
the startup error for several spellings.
Model: opus-5-5
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