Changelog

[Unreleased]

Sub-minute scheduling — Schedule(...) accepts a 6-field cron with a leading seconds field (e.g. */15 * * * * *); the scheduler evaluates at 1-second resolution. 5-field crons are unchanged.
Built-in cron scheduler in barca serve — enforces freshness=Schedule(...), timezone-aware (--timezone), durable catch-up on restart, self-overlap skip, and live status via GET /schedule; disable with --no-schedule.
Shared remote state — barca.toml config, --env separation, and remote artifact storage (Azure/S3/GCS/R2 via fsspec) with the metadata DB as a blob.
Real freshness= keyword parameters on the @asset/@sensor/@task Python stubs (IDE autocomplete + type checking).
examples/scheduler — a minimal standalone task-scheduler example.
Sensors as first-class nodes with observation history
Sensor-aware CLI display (observation info instead of materialization info)

Async-native core: the async runtime is owned by the caller, with cancellable runs.
Cron parsing centralized behind one CronExpr::parse helper shared by validation, the scheduler, and the /schedule handler.

Rust + Python hybrid architecture: a Cargo workspace (barca-core, barca-cli, barca-server) for parsing, planning, and dispatch, plus a Python package (python/barca/) for decorator stubs and the worker
@asset() decorator with dependency tracking, partitions, and content-addressed caching
@sensor() decorator for external state observation with (update_detected, output) return contract
@task() decorator for side-effect operations (replaces earlier @effect concept)
Schedule-driven reconciliation: "manual", "always", cron("...") schedules
Single-pass and continuous (--watch) reconcile modes
AST-based dependency tracing with per-function dependency cone hashing
Partitioned assets with worker-pool parallelism
Asset continuity via @asset(name="stable_name")
SQLite metadata store with optional Turso/libSQL remote support
CLI: get, run, plan, history, stats, serve, version
HTTP server (axum) with background scheduler
Test suite covering all features (Rust unit/integration tests + Python worker tests)
Benchmark suite comparing Barca, Prefect, and Dagster
Spaceflights benchmark (10-asset diamond DAG adapted from Kedro)

For the full project changelog (including this site’s own history), see CHANGELOG.md in the repository root.