Yjs LevelDB Persistence Adapter

y-leveldb is a persistence adapter for Yjs, the CRDT framework for real-time collaboration. It enables storing Yjs document updates persistently using LevelDB and its compatible implementations (like RocksDB, LMDB, or `level-mem`). The current stable version is `0.2.0`. Releases are infrequent but address compatibility, dependency updates, and bug fixes. Key differentiators include its flexibility to use various LevelUP-compatible storage backends, its direct integration into Yjs ecosystems (e.g., `y-websocket`), and its ability to manage multiple Yjs documents within a single database instance. The library provides a granular API for storing and retrieving document updates, state vectors, and custom metadata without necessarily hydrating a full Y.Doc object, which is crucial for efficient server-side synchronization and data management.