The autouse _setup_db fixture ran create_all + drop_all for every test in
the suite, including the many that never open a session. That cycle costs
~49ms against these 22 tables; truncating them instead costs ~6ms for the
same guarantee of an empty database per test.
Build the schema once, then delete every row before each subsequent test.
No model sets sqlite_autoincrement, so SQLite reuses rowids after a full
delete and generated ids still restart at 1.
Measured over 874 tests, deterministic order: 138.6s -> 74.5s (~46%).
Verified green under pytest-randomly's default random ordering as well.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
dennisthiessenandClaude Opus 5
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