storage: define pruning/snapshots/compaction strategy for mainnet #203
Description
Goal
Define and implement a production strategy for state storage growth: pruning, snapshots, compaction, and safe migrations.
Scope
- Decide retention policy (full history vs pruned) and what is required to verify state
- Snapshot format + restore procedure
- RocksDB compaction/CF tuning and disk growth monitoring
- Data migrations/versioning for on-disk formats
Acceptance criteria
- Node can run for long periods without unbounded disk growth (with a defined policy)
- Snapshot/restore can bring up a new node to current head
- Migration path is tested and documented