Module config 

Stream and basin configuration types.

Stream configuration uses three representations:

• Resolved (StreamConfig, TimestampingConfig, DeleteOnEmptyConfig): concrete values, produced by merging optional configs with defaults using merge().

• Optional (OptionalStreamConfig, OptionalTimestampingConfig, OptionalDeleteOnEmptyConfig): partial configuration layers, where None means “not set at this layer; fall back to defaults.”

• Reconfiguration (StreamReconfiguration, TimestampingReconfiguration, DeleteOnEmptyReconfiguration): PATCH-style updates applied with reconfigure().

Reconfiguration of nested fields (e.g. timestamping, delete_on_empty, default_stream_config) is applied recursively: Specified(Some(inner_reconfig)) applies the inner reconfiguration to the existing value, while Specified(None) clears it to the default.

merge() resolves optional configs into resolved configs with precedence: stream-level → basin-level → system default (via Option::or chaining).

Basin config also carries basin-level knobs like stream_cipher, create_stream_on_append, and create_stream_on_read.

Structs

BasinConfig

BasinReconfiguration

DeleteOnEmptyConfig

DeleteOnEmptyReconfiguration

OptionalDeleteOnEmptyConfig

OptionalStreamConfig

OptionalTimestampingConfig

StorageClassIter

An iterator over the variants of StorageClass

StreamConfig

StreamReconfiguration

TimestampingConfig

TimestampingReconfiguration

Enums

RetentionPolicy

StorageClass

TimestampingMode