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Storage Backend Parity Spike Report

Objective

Verify that JSONL and SQLite storage backends behave identically regarding relationship management to ensure consistent graph visualization.

Findings

1. Foreign Key Enforcement

Issue: SQLite enforces foreign key constraints on Relation creation (ensuring from_memory_id and to_memory_id exist), while JSONL storage does not. Impact: Data integrity issues in JSONL storage; potential for "ghost" edges in graph visualization. Resolution: Implement validation in JSONLStorage.create_relation to check for existence of source and target memories.

2. Method Naming

Issue: Initial assumption of add_memory/add_relation was incorrect. Resolution: Verified correct methods are save_memory and create_relation.

Verification Suite

A comprehensive test suite tests/parity/test_relationship_parity_suite.py has been created covering:

  • All relationship types
  • Multiple relationships between same nodes
  • Non-existent source/target handling (Parity fix required)
  • Large number of relationships

Conclusion

With the fix for Foreign Key enforcement in JSONL, the backends will have sufficient parity for the graph visualization feature.