feat(workflow)!: name the root workflow ID a case ID

[lokewate]

Summary

Renames the ID that groups a workflow tree's tasks from "root workflow ID" to "case ID". It is a key a host sets: a host that runs several top-level workflows for one real-world matter (a TNSW consignment, an agency case) starts each with the same case ID, so their tasks are grouped together. With none set, a top-level workflow is its own case, as before.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactoring (no functional changes)
• Performance improvement
• Other (please describe):

Changes Made

• workflow: VarRootWorkflowID (_root_workflow_id) → VarCaseID (_case_id); TaskPayload.RootWorkflowID and AdminParkPayload.RootWorkflowID → CaseID. Child workflow IDs keep the form <case ID>--<hash>; the hash folds in the parent's workflow ID, so children of two workflows of one case never collide.
• taskflow/store: TaskRecord.RootWorkflowID → CaseID (JSON case_id, column case_id); GetAllTasks lists a case's tasks.
• New tests: a host-supplied VarCaseID is kept; without one the top-level workflow ID is used.

Testing

• I have tested this change locally
• I have added tests that prove my fix is effective or that my feature works
• I have tested edge cases
• All existing tests pass

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked that there are no merge conflicts

Related Issues

N/A

Screenshots/Demo

N/A

Additional Notes

Hosts must rename the task records' root_workflow_id column to case_id and switch to VarCaseID / CaseID. OpenNSW/nsw-srilanka#646 does this, at the top of a stack that runs consignments as cases of several flows (from OpenNSW/nsw-srilanka#642).

Backwards compatibility: not handled, by design. core is pre-v1.0, so the rename is a hard break: no deprecated aliases for VarRootWorkflowID / RootWorkflowID, and running workflows are not migrated. Hosts adapt when they bump.

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Workflows can now share a case ID across top-level and nested executions. When none is provided, a workflow uses its own execution ID as the case ID.
  • Tasks can be retrieved by case ID, with an empty filter returning all tasks.
• Changes
  • Batch partitions and spawned child workflows now use the case ID for their inputs and identifiers.
  • Workflow documentation now describes _case_id as the engine-provided context variable.

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📝 Walkthrough

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Walkthrough

Workflows now use a case ID in place of a root workflow ID. The case ID is propagated to child workflows and task payloads, and task records can be filtered by case ID.

Changes

Case ID lifecycle

Layer / File(s)	Summary
Define and propagate case identity workflow/dsl.go, workflow/workflow.go, workflow/activities.go, workflow/manager.go, workflow/admin_recovery.go, workflow/case_id_test.go, workflow/batch_mapping_test.go, workflow/README.md	Workflows use _case_id and default it to the current execution ID when absent. Task and admin payloads carry the case ID. Tests and documentation use the new variable.
Use case IDs for child workflows workflow/dynamic_split.go, workflow/batch_gateway.go, workflow/parallel_gateway.go, workflow/utils.go	Child workflow IDs use the case ID as their prefix. Dynamic-split children also receive the case ID in their workflow variables.
Store and filter task records by case taskflow/store/db.go, taskflow/store/gorm/model.go, taskflow/store/gorm/store.go, taskflow/orchestrator/manager.go, taskflow/store/gorm/model_test.go, taskflow/store/gorm/store_test.go, taskflow/orchestrator/manager_test.go	Task records and GORM mappings use CaseID. GetAllTasks filters by case ID when it is non-empty, and task creation records the payload’s case ID.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant Workflow
  participant ExecuteTaskActivity
  participant TaskPayload
  participant StartTask
  participant TaskRecord
  Workflow->>ExecuteTaskActivity: pass caseID
  ExecuteTaskActivity->>TaskPayload: set CaseID
  TaskPayload->>StartTask: provide task payload
  StartTask->>TaskRecord: record CaseID

Loading

Suggested reviewers: aravinda-hwk, sthanikan2000

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Merge Risk: 🟡 Moderate · up to 8fb07

Workflows started with an empty case ID may record child tasks under a different case. Task listing may also return nothing when a host's case ID differs from its workflow ID. Both should be resolved before merging this breaking rename.

Pre-merge checks | 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary breaking change: renaming the root workflow ID concept to a case ID.
Description check		The description includes the required summary, change type, detailed changes, testing status, checklist, related issues, demo status, and additional migration notes. The unchecked edge-case testing it…
Docstring Coverage		Docstring coverage is 92.86% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 18 files. (1 skipped: 1…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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Inline comments:
Review comments at @taskflow/store/gorm/store.go:
- Line 75: Update TaskManager.GetAllTasks to pass the case ID expected by the
store’s case_id filter, rather than parentWorkflowID. Align the test store’s
ParentWorkflowID filter with this case-ID contract and add a listing assertion
that returns tasks across two workflows sharing one case ID.

Review comments at @workflow/workflow.go:
- Around line 66-67: Update workflow variable initialization to treat an empty
VarCaseID string like a missing value, matching the non-empty check in caseID(),
and store instance.ID as the fallback before starting children.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: defaults
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• Run ID: d8ef11ab-5e28-46b8-bebf-d8cd5ddcb767

📥 Commits

Reviewing files that changed from the base of the PR and between 643bf60 and 8fb07c8.

📒 Files selected for processing (19)

• taskflow/orchestrator/manager.go
• taskflow/orchestrator/manager_test.go
• taskflow/store/db.go
• taskflow/store/gorm/model.go
• taskflow/store/gorm/model_test.go
• taskflow/store/gorm/store.go
• taskflow/store/gorm/store_test.go
• workflow/README.md
• workflow/activities.go
• workflow/admin_recovery.go
• workflow/batch_gateway.go
• workflow/batch_mapping_test.go
• workflow/case_id_test.go
• workflow/dsl.go
• workflow/dynamic_split.go
• workflow/manager.go
• workflow/parallel_gateway.go
• workflow/utils.go
• workflow/workflow.go

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[lokewate]

govulncheck failed due to new advisories on golang.org/x/net v0.58.0. Bumping to v0.60.0 in #298

[lokewate]

@Aravinda-HWK PTAL

[Aravinda-HWK]

LGTM