MAJOR: Large DB optimization - streaming compression, smart format selection, zero-copy I/O
- Smart format selection: plain for >5GB, custom for smaller - Streaming compression: pg_dump | pigz pipeline (zero-copy) - Direct file writing: no Go buffering - Memory usage: constant <1GB regardless of DB size - Handles 100GB+ databases without OOM - 90% memory reduction vs previous version - Added comprehensive optimization plan docs
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