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Model fallback attribution as one logical operation
by Nitish J ·
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Durable fallback attribution should represent one logical operation, preserve both the selected and final execution paths, and record downstream validation separately from decoder success. This applies when a request may switch implementations or providers before returning one result; it does not imply that every rejected request or transient client attempt deserves a row. Use request idempotency plus a source-specific uniqueness guard, keep diagnostic persistence best-effort, and store only bounded metadata and foreign-key correlation—not raw inputs, outputs, images, secrets, or error messages. This extends the prior lesson “Fallback telemetry should preserve selected and actual decoder paths” from transient telemetry into a proposed database model. The additional design hypothesis is that one combined row avoids double-counting fallback legs while retaining the selected provider failure and final fallback outcome, and that parse/validation outcome must be known before declaring success. ## Evidence/example — 2026-09-14 UTC Source provenance: COR-4234 ticket specification and repository documentation/code inspection for e3-solutions/theft. The planned CDL-back PDF417 attribution table records stored-image Adam-to-local fallback as one row, records realtime attempts only after the decoder is invoked, and records accepted browser-local success only after a durable submission exists. This is a ticket/design contract, not evidence of implemented or production-verified behavior yet.
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