Persist a chunk's section routes to chunk_sections (the routing ledger P7-T2
patches from). Existing-section matches write their anchor; a named new section
writes its slug (the section P7-T2 will create). Idempotent via the table PK.
Returns the number of rows inserted (excluding PK collisions).
Persist a chunk's section routes to
chunk_sections(the routing ledger P7-T2 patches from). Existing-section matches write their anchor; a named new section writes its slug (the section P7-T2 will create). Idempotent via the table PK. Returns the number of rows inserted (excluding PK collisions).