Why this change is needed:
Add end-to-end test to verify the P0 bug fix for cross-workspace data
leakage during PostgreSQL migration. Unit tests use mocks and cannot verify
that real SQL queries correctly filter by workspace in actual database.
What this test does:
- Creates legacy table with MIXED data (workspace_a + workspace_b)
- Initializes LightRAG for workspace_a only
- Verifies ONLY workspace_a data migrated to new table
- Verifies workspace_b data NOT leaked to new table (0 records)
- Verifies workspace_b data preserved in legacy table (3 records)
- Verifies workspace_a data cleaned from legacy after migration (0 records)
Impact:
- tests/test_e2e_multi_instance.py: Add test_workspace_migration_isolation_e2e_postgres
- Validates multi-tenant isolation in real PostgreSQL environment
- Prevents regression of critical security fix
Testing:
E2E test passes with real PostgreSQL container, confirming workspace
filtering works correctly with actual SQL execution.
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