9bbe6f3ad9506d9bee48495baf26655940e0a20b
- ADR-009 (new): postgres Large Objects ship as the fs tier's second engine (feature pg-lo, default-off), admitted on POC #7's passed gate (contract 10/10, durable put ~= fs at >=1 MiB, lo_get window gets, transactional LO lifecycle = zero crash orphans). Engine shape: companion table (lo_entries) is the contract authority; put = one tx (lo_create + lowrite + row + pin); get = descriptorless lo_get windows (lo_*64 discipline); named operator deltas (catalog space never returned / autovacuum inherited / sweep for the legacy bypass class only) and named performance deltas (cached-get 20-50x behind page-cache fs single-stream, ~700 MB/s aggregate at 16 readers = the fleet serving picture). - Ripple: backends-and-dispatch (pg-lo shipped; fleet locality contract gains the whole-fleet-pg-lo option), overview (layer map, feature table + pg-lo row, OQ -> shipped pointer), requirements (engine def + REQ-2 note updated), README (current-state + ADR table), store-api (invariant 1/6 engine lists), ADR-008 Status amendment (pg-lo posture superseded by ADR-009), open-questions (audit trail completed: decided -> sequenced -> completed). Verification: docs-only; all cross-references resolve (ADR/REQ/POC); register, findings, spec, and both engine-ADR status lines agree.
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