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Add per-row AL performance guidance (#97)

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* Add per-row performance guidance

Document SetAutoCalcFields for per-row FlowFields and direct writes on iterated records, with focused reviewer retrieval cues.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 85be3fc4-5253-47b8-ba1b-6b8fd188fcea

* Bound commit checkpoints by key range

Use a capped ordered query to discover each checkpoint watermark before locking and processing only that key range.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 85be3fc4-5253-47b8-ba1b-6b8fd188fcea

* Address performance retrieval review

Retrieve Commit-in-loop guidance precisely, process exact checkpoint key lists, and narrow clone-before-write discovery.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 85be3fc4-5253-47b8-ba1b-6b8fd188fcea

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Co-authored-by: Jesper Schulz-Wedde <jesper.schulzwedde@microsoft.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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---
bc-version: [all]
domain: performance
keywords: [setautocalcfields, calcfields, calcsums, flowfield, loop, per-row]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Use SetAutoCalcFields when each iterated row needs a FlowField
## Description
`Record.SetAutoCalcFields` has been available since runtime 1.0 and makes the specified FlowFields calculate as records are retrieved. Microsoft's [AL database-method performance guidance](https://learn.microsoft.com/en-us/dynamics365/business-central/dev-itpro/administration/optimize-sql-al-database-methods-and-performance-on-server#setautocalcfields) uses it to remove an explicit `CalcFields` call from every iteration when each row's FlowField drives a branch. This is different from `CalcSums`, which returns a total for the filtered set rather than a value for each row.
## Best Practice
Call `SetAutoCalcFields` before `FindSet` when every returned row needs the same FlowField for a comparison, branch, or per-record action. Use `CalcSums` instead when the required result is one aggregate over the filtered set (see `calcsums-instead-of-calcfields-in-loop.md`).
See sample: `use-setautocalcfields-for-per-row-flowfields.good.al`.
## Anti Pattern
Calling `CalcFields` inside the loop when every iteration reads the same FlowField. Each `CalcFields` request requires a separate SQL statement unless a compatible recent result is cached. Do not replace row-specific decisions with `CalcSums`; an aggregate cannot preserve which rows met the condition.
See sample: `use-setautocalcfields-for-per-row-flowfields.bad.al`.