Changelog

All notable changes to the Janus project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased] - 2025-11-24

Historical Sliding Window Operator (src/stream/operators/historical_sliding_window.rs)
- Implements Iterator pattern for sliding windows over historical data
- Supports configurable width, slide, and offset parameters
- Uses SystemTime::now() internally to determine window boundaries
- Clamps window end to prevent querying beyond current time
- Mandatory offset parameter for "go back" semantics
Historical Fixed Window Operator (src/stream/operators/historical_fixed_window.rs)
- Single-query operator for fixed time ranges [start, end]
- Implements Iterator pattern (yields once, then returns None)
- Enforces mandatory start and end timestamps
Integration Tests with Real RDF IRIs
- tests/historical_sliding_window_test.rs: Sensor data and FOAF examples
- tests/historical_fixed_window_test.rs: IoT devices and semantic web publications
- Uses standard vocabularies: RDF, FOAF, Dublin Core, BIBO

Consolidated window definitions to use WindowDefinition from janusql_parser.rs consistently
Removed duplicate HistoricalWindow struct from src/stream/operators/hs2r.rs
Moved historical_sliding_window.rs into src/stream/operators/ directory for better organization

Window end clamping to prevent querying future data in sliding windows
Type consistency across window operators
Clippy warnings: Replaced Arc with Rc in window operators and tests since they don't use threading
- Fixed arc_with_non_send_sync lint errors
- All CI checks now pass (rustfmt, clippy, tests, build)
CI/CD Test Suite failures: Removed unit tests from operator files
- Integration tests in tests/ directory provide comprehensive coverage
- Fixed timing race condition in integration tests
- All 35 tests now pass on all platforms

Core RDF event processing
Segmented storage with two-level indexing
JanusQL parser with support for live, historical sliding, and historical fixed windows
Dictionary encoding for efficient RDF storage
Basic streaming infrastructure

Note: This changelog tracks changes starting from the implementation of historical window operators. Earlier changes may not be fully documented.