Félix Malfait
fa6d1394af
## Overview Second PR in the Pick Record stack. Adds a **Round Robin** selection strategy alongside Random, so an assignment workflow can distribute records *evenly* across a candidate pool (e.g. rotate company ownership across a set of workspace members) rather than just randomly. **Stacked on #21899** — review/merge that one first. This PR's diff against `main` includes PR 1's commits until #21899 merges. ## What changed - Widened the `strategy` enum (`RANDOM` → `RANDOM | ROUND_ROBIN`) in the shared schema and the server input type. - Editor now shows a **Strategy** selector (Random / Round robin). The candidate-pool label changed from "Pick at random from" to the neutral "Pick from" since random is no longer the only mode. - Executor implements round robin. ## Design decisions & tradeoffs 1. **State store: Redis `incrBy` (atomic), keyed `pick-record:round-robin:{workspaceId}:{stepId}`.** Round robin needs a persistent cursor, and workflow runs are **not** serialized — two runs can execute the same step concurrently — so the increment must be atomic. `CacheStorageService.incrBy` (workflow cache namespace) is a single atomic Redis op, needs no schema change, and is already injectable. Index = `(cursor - 1) % poolSize`. **Tradeoff — durability:** a Redis flush/eviction resets the cursor, which restarts the cycle from an offset. That causes a one-time *fairness drift*, never a *correctness* bug (no double-assignment, since each increment is atomic). If strict durability is ever required, the cursor can move to a Postgres counter table with `INSERT … ON CONFLICT … DO UPDATE SET cursor = cursor + 1 RETURNING cursor` (atomic + durable) — deliberately **not** done here to avoid a migration for what is, in practice, an acceptable reset. 2. **Deterministic pool ordering.** The resolved pool is sorted by `id` before the cursor is applied, so position→record mapping is stable run-to-run regardless of fetch order. Without this, round robin wouldn't reliably cycle. 3. **Cursor key uses `stepId`.** Stable across runs of a published version. Republishing a version may mint new step ids, which resets the cursor — acceptable and documented here. 4. **Slot-on-increment.** The cursor increments when the step runs (reserving a position); if a later step in the run fails, that position is effectively skipped. Minor, acceptable unfairness — flagged rather than adding cross-step compensation. ## Testing Added `pick-record-round-robin-workflow.integration-spec.ts`: builds a workflow with a 3-record pool and `ROUND_ROBIN`, runs it 4 times sequentially, and asserts the picks are exactly `[p0, p1, p2, p0]` (full cycle + wraparound) against the deterministically-ordered pool. Passes locally alongside PR 1's random test (2 suites / 3 tests). `typecheck` + `lint:diff-with-main` green for shared/server/front. ## Follow-up - PR 3: `LOAD_BALANCED` (fewest related records wins). https://claude.ai/code/session_01MuPWZsqf2bmQSevk6fRbX8 --- _Generated by [Claude Code](https://claude.ai/code/session_01MuPWZsqf2bmQSevk6fRbX8)_ <!-- This is an auto-generated description by cubic. --> <a href="https://cubic.dev/pr/twentyhq/twenty/pull/21900?utm_source=github" target="_blank" rel="noopener noreferrer" data-no-image-dialog="true"><picture><source media="(prefers-color-scheme: dark)" srcset="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"><source media="(prefers-color-scheme: light)" srcset="https://www.cubic.dev/buttons/review-in-cubic-light.svg"><img alt="Review in cubic" src="https://www.cubic.dev/buttons/review-in-cubic-dark.svg"></picture></a> <!-- End of auto-generated description by cubic. -->
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