db.Exec was being passed %s format specifiers directly in the SQL
string, but db.Exec does not do printf-style formatting - it uses the
variadic args as SQL parameter bindings. This caused the literal %s
to be sent to SQLite, which failed with near percent: syntax error.
Fixed by using fmt.Sprintf to interpolate the column expressions into
the SQL string before passing to db.Exec.
Added regression test that creates an old-schema database with edge
columns (replies_to, relates_to, duplicate_of, superseded_by) and
verifies migration 022 completes successfully.
Fixes#809
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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