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Upgrade core dependencies to pick up deltalake 0.30 features (log compaction, vacuum lite mode, parallel partition writers). Version changes: - deltalake: 0.29.4 → 0.30.2 - arrow/parquet: 56.2 → 57.3 - datafusion: 50.3 → 51.0 - serde_arrow: 0.13.7 → 0.14.0 - delta_kernel: 0.16 → 0.19.2 Code changes (all mechanical): - DeltaOps deprecated; migrate to DeltaTable methods directly - try_from_uri renamed to try_from_url - Add type annotation for inference change in test Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Implement automatic checkpointing and vacuuming for both the pond data and control Delta tables, addressing the unbounded delta log growth documented in deltalake-efficiency.md. Automatic maintenance (best-effort, after every write commit): - Checkpoint every 10 versions (Delta standard interval) - Vacuum stale parquet files (lite mode) - Log cleanup of expired delta log JSON files Manual maintenance via 'pond maintain' CLI command: - Always creates checkpoint (forced) - Runs vacuum - Optional --compact flag to merge small parquet files New files: - crates/steward/src/maintenance.rs: checkpoint/vacuum/compact logic - crates/cmd/src/commands/maintain.rs: CLI command Modified: - Ship::commit_transaction(): auto-maintenance after write commits - Ship::maintain(): orchestrates maintenance on both tables - ControlTable::set_table(): replace table after vacuum/optimize - OpLogPersistence::set_table(): replace table after vacuum/optimize - Steward dispatch: expose maintain() through enum Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Specifically a new maintenance routine based on vacuum and checkpointing.