Provides the `BoltStruct` derive macro that auto-generates PackStream encoding and decoding for any Rust struct annotated with `#[signature]`. The macro implements traits for parsing from a byte stream and writing as a Bolt struct with a type marker. This pattern is reusable for any binary protocol requiring struct-level type tagging and can be extracted independently.

A generic concurrent hash map built on `RwLock<HashMap>`, offering safe asynchronous read and write operations via closures (`with_read`, `with_write`). Includes an `insert_or_update` method for atomic upserts. This component is self-contained and can be extracted for any async Rust project needing a thread-safe map without external dependencies.

Implements the `AsMap` trait and `AsMapSerializer` which force any serializable Rust value to be serialized as a PackStream map. This is used for structs and tuples that should appear as maps on the wire. The pattern is reusable for any binary serialization format that needs to control the structure of the output beyond serde's default behavior.

Defines the `ElementData` trait and `ElementDataDeserializer` that provide a uniform interface for deserializing graph elements (Node, Relation, Path) by extracting common fields like `Id`, `Labels`, `Properties`. This abstraction reduces code duplication across element-specific deserializers and can be reused for any entity with similar structural components.

Defines the `Retry` enum and `Neo4jErrorKind` to classify errors (Client, Transient, Database) and determine retryability. The pattern separates error representation from retry policy, enabling reusable retry logic for any database driver or external service. The component is self-contained and uses only standard library types.