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5dd503b7b9
Every transaction was reading page 1 from the WAL to check the schema cookie in op_transaction, causing unnecessary WAL lookups. This commit caches the schema_cookie in Pager as AtomicU64, similar to how page_size and reserved_space are already cached. The cache is updated when the header is read/modified and invalidated in begin_read_tx() when WAL changes are detected from other connections. This matches SQLite's approach of caching frequently accessed header fields to avoid repeated page 1 reads. Improves write throughput by 5% in our benchmarks.