Ship Workflow 2.0.12 schedule precision fix in Server 2.3.9

[rmcdaniel]

Change

Adopt the published Workflow 2.0.12 package (39940444), addressing durable-workflow/workflow#505. Prepare Server 2.3.9 / Helm 0.1.88 using the existing source-release synchronizer; generated defaults remain aligned.

Add command-level regressions for exact whole-second, exact fractional, elapsed fractional and future fractional deadlines. Each goes through schedule:evaluate, checks persisted timestamp precision and verifies repeated evaluation does not start twice.

Verification

The four new SQLite command tests pass (35 assertions). Pint and source-release consistency pass. Broader schedule suite and repository CI are running. No public API, protocol, schema or resource defaults change.

Delivery

After required checks: publish the immutable image/chart, verify its bundled Workflow version, and run the published schedule experiments covering cadence, missed-fire restart, operator controls and official clients. No unchanged SDK or CLI release is required.

[rmcdaniel]

The complete focused Server schedule suite passes: 131 tests / 721 assertions, including the four new command-level persisted-deadline regressions. Pint and source-release consistency checks pass. Upstream published Workflow 2.0.12 also passed SQLite/MySQL/PostgreSQL tick qualification plus all 16 published Laravel upgrade journeys; see durable-workflow/workflow#505. Image publication and published Server schedule qualification still remain.

[rmcdaniel]

Server 2.3.9 and Helm 0.1.88 publication completed successfully: https://github.com/durable-workflow/server/actions/runs/34420737996. The downloaded Docker image is sha256:653d4180e73153846b140dc796f3266fc0b932a581ad1615b1ce3fbc25aec7c3. The focused published-image cadence and missed-fire/restart experiment is now running against that exact image. This follows the scheduler-only change; it is not a claim of a newly rerun full SDK/protocol matrix.

[rmcdaniel]

Published-artifact scheduler qualification completed 2026-09-10 00:27:33-00:40:06 UTC.

Image: durableworkflow/server:2.3.9@sha256:653d4180e73153846b140dc796f3266fc0b932a581ad1615b1ce3fbc25aec7c3. A fresh PHP process inside the downloaded image verifies Workflow 2.0.12, source 39940444228086d8d888ef8061cd67df8cbba8c2. Runner: Server 68168f34b637a19c054211f4db2df9c616799a86, existing scripts/conformance/schedules-published-artifacts.sh; no local product source was mounted into the tested runtime.

Selected behavior	Result
Cron cadence	Pass: four original occurrences; 0-1s measured drift; no duplicate or skipped fire
Fixed-rate cadence	Pass: eight original occurrences; 1-4s measured drift; no duplicate or skipped fire
Missed-fire policy	Pass: confirmed 125s scheduler outage, no fires while stopped, one catch-up preserving the overdue occurrence, then normal cadence
Restart survival	Pass: schedule remained listable/describable and fired after Server restart within the existing 90s deadline

Cadence history reads had zero transient transport failures. Both selected scenario files have no findings. The Docker stacks, networks and volumes were removed by the runner.

Reproduce from this repository:

DW_SERVER_VERSION=2.3.9 \
DW_SERVER_IMAGE=durableworkflow/server:2.3.9 \
DW_CLI_VERSION=2.0.0 DW_PHP_SDK_VERSION=2.0.9 \
DW_PYTHON_SDK_VERSION=2.0.4 DW_WATERLINE_VERSION=2.0.2 \
DW_SCHEDULES_RUN_PHP_SURFACE_SHARD=0 \
DW_SCHEDULES_RUN_CROSS_LANGUAGE_SHARD=0 \
DW_SCHEDULES_RUN_CLI_SURFACE_SHARD=0 \
DW_SCHEDULES_RUN_PYTHON_LIFECYCLE_SHARD=0 \
DW_SCHEDULES_RUN_OPERATOR_CONTROLS_SHARD=0 \
DW_SCHEDULES_RUN_ADVERSARIAL_SHARD=0 \
bash scripts/conformance/schedules-published-artifacts.sh --result-dir results

Scope is deliberately the changed scheduler behavior, not a new full schedule/SDK conformance claim. CLI, SDK and Waterline variables are resolver context only for these selected runtime probes; their skipped client/install scenarios remain not_covered. Exact whole-second/fractional predicate, no-early-start and repeated-tick tests are separately qualified against published Workflow 2.0.12 on SQLite/MySQL/PostgreSQL in Workflow #505.

Publication, matching Helm chart and all required source CI checks passed. Sample App #88 is the remaining service-mode example adoption.