[FEATURE] Bulk import/export — high-throughput data migration (CSV, JSON, Parquet)

[ElioNeto]

Description

ApexStore has no bulk data import/export capability. Users must write custom scripts using the set/get API, which is slow for large datasets.

Proposed Implementation

Import

apexstore-cli import --format csv --file data.csv
apexstore-cli import --format json --file data.ndjson

Optimizations:

• Skip WAL fsync during bulk import (direct SSTable generation)
• Sort keys before writing for better compression
• Parallel SSTable building across column families

Export

apexstore-cli export --format csv --output all_keys.csv
apexstore-cli export --format parquet --output data.parquet

Impact

• Enables data migration from other databases
• Enables ETL pipelines
• Reduces import time from hours to minutes for large datasets

Labels

[ElioNeto]

Fixed in commit 1d8c830.