Layer 2 of the AtoCore architecture. Adds typed engineering entities
with relationships on top of the flat memory/state/chunk substrate.
Schema:
- entities table: id, entity_type, name, project, description,
properties (JSON), status, confidence, source_refs, timestamps
- relationships table: source_entity_id, target_entity_id,
relationship_type, confidence, source_refs
15 entity types: project, system, subsystem, component, interface,
requirement, constraint, decision, material, parameter,
analysis_model, result, validation_claim, vendor, process
12 relationship types: contains, part_of, interfaces_with,
satisfies, constrained_by, affected_by_decision, analyzed_by,
validated_by, depends_on, uses_material, described_by, supersedes
Service layer: full CRUD + get_entity_with_context (returns an
entity with its relationships and all related entities in one call).
API endpoints:
- POST /entities — create entity
- GET /entities — list/filter by type, project, status, name
- GET /entities/{id} — entity + relationships + related entities
- POST /relationships — create relationship
Schema auto-initialized on app startup via init_engineering_schema().
7 tests covering entity CRUD, relationships, context traversal,
filtering, name search, and validation.
Test count: 290 -> 297.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
