* fix(provenance): use timezone-aware UTC and assert stored records (#946)
Replace datetime.utcnow() in ProvenanceManager, ProvenanceEntry,
BridgeAxiom, and GraphBuilderWithProvenance with
datetime.now(timezone.utc), matching PipelineWithProvenance.
KG workflow and integration tests now read provenance back through
get_provenance() and assert algorithm metadata instead of generated
IDs, and call tracker methods that actually persist records.
* fix(provenance): compare provenance timestamps as instants, not strings
query_recorded_between() and audit_log() filtered and sorted on raw ISO
strings. With the timezone-aware change, a store can hold both pre-existing
naive stamps and offset-bearing ones, and the two are not string-comparable:
"...500000+00:00" sorts above "...500000", so a record at the identical
instant as a naive bound falls outside the range that should contain it.
Both now parse through _parse_timestamp() before comparing, reading naive
values as UTC. This mirrors ProvenanceTracker._parse_dt() in kg/, the class
ProvenanceManager replaces, so both sides of the migration answer a range
query the same way. Unparseable stored timestamps are skipped and logged
rather than silently dropped; unparseable bounds raise ValueError.
---------
Co-authored-by: Pravit Ampapathini <pravit.amp@gmail.com>
analyze_evolution() previously appended a constant placeholder (durations.append(1)) for every bounded relationship, so the stability metric was always 1.0 when any bounded relationship existed and 0 otherwise, never reflecting actual valid-time durations.
Stability now computes the mean valid-time duration in seconds ((valid_until - valid_from).total_seconds()) across relationships with both bounds set; unbounded/half-open intervals are skipped and non-positive intervals clamped to 0. Adds unit tests and a CHANGELOG entry.
Co-authored-by: 江俊杰 <jiangjunjie.37@jd.com>
* fix(kg): align GraphBuilder raw-text extraction defaults with the documented contract
_extract_from_text() defaulted ner_method, relation_method and
triplet_method to "llm" and ran relation extraction unconditionally,
contradicting the build() docstring ("ml"/"pattern"/False) and the
standalone extractor defaults. Any raw-text build() therefore required a
provider, an API key, and network access without saying so.
Defaults are now ml/pattern/pattern with extract_relations=False. LLM
extraction is unchanged and now opt-in via explicit kwargs.
Also documents relation_method and extract_triplets, which the docstring
never listed, and drops the stale "Default to LLM methods as per
requirement" comment.
Closes#930
* perf(kg): reuse extractors across texts instead of rebuilding per source
Addresses review feedback on #941. NERExtractor.__init__ loads its spaCy
model eagerly when the method includes "ml", so switching the default
from "llm" to "ml" made _extract_from_text() reload the model once per
source in a multi-document build.
Extractors are now cached per (kind, method) on the builder. Adds tests
asserting single construction across repeated texts, that distinct
methods still get distinct extractors, and that the default path runs
end to end without any provider call.
* fix(kg): keep fallback method lists working with the extractor cache
The extractor cache keyed directly on `method`, but all three extractors
accept a list for fallback ordering (e.g. ner_method=["pattern", "ml"]),
so a list argument raised TypeError: unhashable type: 'list' before
extraction started. Lists are now converted to tuples for the cache key
only; the extractor still receives the original value.
Also seeds _extraction_stats in __init__. It was previously created only
in build(), so calling _extract_from_text() directly — as the report's
repro does — raised an AttributeError that the broad except swallowed and
logged as "Entity extraction failed".
Adds coverage for list methods on all three extractors, cache reuse for
equal lists, and distinct entries for different orderings.
* fix(kg): forward extracted relations into triplet extraction
_extract_from_text() passed only entities= to extract_triplets(), so
TripletExtractor re-derived relations itself whenever relations is None,
using a method taken from triplet_method rather than relation_method.
That duplicated work and could yield triplets inconsistent with the
relations already extracted.
relations is now initialized to None, holds the extracted list when
extract_relations=True succeeds, and is forwarded to extract_triplets().
When extraction is disabled or fails, None is passed and
TripletExtractor's existing self-derivation is unchanged.
Folded in at maintainer request rather than tracked as #944.
* docs(changelog): note that #878 documented the LLM defaults before this landed
#878 merged while this was in review and resolved the same code/docstring
mismatch in the opposite direction. Records that #930's decision makes
the code the side that changes, and that #878's docstring formatting is
retained.
- PathFinder.bfs_shortest_path() and dijkstra_shortest_path() gain a
directed: bool = True parameter. When False, a temporary undirected
view (graph.to_undirected()) is used for traversal only; the original
directed edges are preserved and returned in the response.
- _make_undirected_view() helper added to PathFinder; falls back safely
for non-NetworkX graph types.
- GET /api/graph/node/{id}/path exposes ?directed=false query param.
- PathResponse gains a directed: bool field echoing the mode used.
- Route now returns 404 on empty path (previously returned 200 with
path: []).
- 21 new tests: 12 unit (TestBidirectionalPathFinding) + 9 API-level
(TestBidirectionalPathRoute). All 120 tests pass.
- CHANGELOG updated under [Unreleased].
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Add TemporalGraphRetriever to context_retriever.py (no new file per project convention)
- Drop-in wrapper for ContextRetriever; filters related_entities/related_relationships
via reconstruct_at_time(); at_time=None is a true passthrough
- Returns new RetrievedContext objects (no in-place mutation)
- Graceful ImportError if temporal modules unavailable
- Add at_time + header_template to ContextRetriever._generate_reasoned_response()
and query_with_reasoning()
- Temporal header prepended to LLM context block only when at_time is set
- Naive datetimes normalised to UTC before formatting
- Header built with str.replace (not .format) to prevent format-string injection
- Add TemporalQueryRewriter + TemporalQueryResult to semantica/kg/
- Regex-only (default) and LLM-assisted extraction modes
- Resolves temporal phrases via TemporalNormalizer (deterministic, zero LLM)
- Word-boundary guards on intent keywords; year fallback for noun-phrase dates
- Never calls reconstruct_at_time — extraction only
- Export TemporalGraphRetriever from semantica.context
- Export TemporalQueryRewriter, TemporalQueryResult from semantica.kg
- Add 99 tests across two new test files
- tests/context/test_temporal_retriever.py (56 tests)
- tests/kg/test_temporal_query_rewriter.py (43 tests)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Robust ID extraction in CentralityCalculator, CommunityDetector, and ConnectivityAnalyzer
- Support for direct Entity objects and dictionaries as node identifiers
- Improved Entity hashability in utils/types.py
- Added integration test to verify fix and prevent regression
