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Raise ValueError instead of AssertionError for invalid arguments

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User-facing argument validation in db.py previously used bare
assert statements, which vanish entirely under python -O and raise
AssertionError - an exception type callers should not have to
catch for input validation. Fifteen validation sites now raise
ValueError with the same messages. Internal invariants (an
unreachable branch and a post-update rowcount check) remain
asserts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UnLnhsH25Nnv7LHhekUfPd
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Claude 2026-07-04 19:19:24 +00:00
commit a2e6ea2eca
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7 changed files with 83 additions and 63 deletions
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tests/test_convert.py
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@ -77,7 +77,7 @@ def test_convert_output(fresh_db, drop, expected):
def test_convert_output_multiple_column_error(fresh_db):
table = fresh_db["table"]
with pytest.raises(AssertionError) as excinfo:
with pytest.raises(ValueError) as excinfo:
table.convert(["title", "other"], lambda v: v, output="out")
assert "output= can only be used with a single column" in str(excinfo.value)