kala.time-travel — io.github.anusornc/kala 0.1.0

Time travel over the storage log: replay, as-of snapshots, since views, history, and speculative with(). Rebuilding a db re-applies every log entry through the transaction pipeline's index and schema primitives, so a rebuilt db value equals the live one.

as-of clj

(as-of db t)

The db value as of transaction t (a t counter or a tx entity id).

db-with clj

(db-with db tx-data)

Speculative transaction: applies tx-data against a db value and returns the report {:db-before :db-after :t :tx-data :tempids} without touching storage or the connection.

history clj

(history db)

The db value containing every assertion and retraction ever transacted, each with its added flag.

restore-db clj

(restore-db storage)

Rebuild the current db value from the complete storage log. Opening an existing database is: open storage, restore-db, continue — nothing is lost or applied twice.

since clj

(since db t)

A view of the db exposing only datoms asserted after t (a t counter or a tx entity id). Facts from t and earlier are invisible even though they remain current. Views are read-only: transact/with reject them.