feature/GH-7-sqlite-engine-wal-migrations
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Closes #7. Implements DatabaseEngine with WAL pragmas (journal_mode=WAL, synchronous=NORMAL, busy_timeout=5000, foreign_keys=ON) and ephemeral database test harness (tempfile).
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Closes #7. Implements DatabaseEngine with WAL pragmas (journal_mode=WAL, synchronous=NORMAL, busy_timeout=5000, foreign_keys=ON) and ephemeral database test harness (tempfile).