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+# Work Summary: Workflow Orchestration Design
+
+**Date**: 2026-01-27  
+**Session Focus**: Architecture design and planning for workflow orchestration feature  
+**Status**: Design complete, Phase 1 implementation started (database migration complete)  
+
+---
+
+## Objective
+
+Design a comprehensive workflow orchestration system for Attune that enables composing multiple actions into complex, conditional execution graphs with variable passing, iteration, and error handling.
+
+---
+
+## Accomplishments
+
+### 1. Complete Technical Design ✅
+
+Created `docs/workflow-orchestration.md` (1,063 lines):
+- **Core Architecture**: Workflows as first-class actions
+- **Execution Model**: Event-driven, graph-based task execution
+- **Variable System**: 6-scope variable access (task, vars, parameters, pack.config, system, kv)
+- **Template Engine**: Tera integration for Jinja2-like templating
+- **Database Schema**: 3 new tables (workflow_definition, workflow_execution, workflow_task_execution)
+- **Rust Implementation**: Detailed component specifications with code examples
+- **Message Flow**: Integration with existing RabbitMQ infrastructure
+- **Security & Performance**: Comprehensive considerations
+
+### 2. Implementation Roadmap ✅
+
+Created `docs/workflow-implementation-plan.md` (562 lines):
+- **5-Phase Plan**: 9 weeks total implementation timeline
+  - Phase 1: Foundation (2 weeks) - DB, models, parser, templates
+  - Phase 2: Execution Engine (2 weeks) - Graph executor, state machine
+  - Phase 3: Advanced Features (2 weeks) - Iteration, parallelism, retry
+  - Phase 4: API & Tools (2 weeks) - CRUD endpoints, monitoring
+  - Phase 5: Testing & Docs (1 week) - Comprehensive testing
+- **API Specifications**: 16 REST endpoints defined
+- **Testing Strategy**: Unit and integration test plans
+- **Success Criteria**: 11 measurable outcomes
+
+### 3. Executive Summary ✅
+
+Created `docs/workflow-summary.md` (400 lines):
+- Quick reference guide for stakeholders
+- Feature overview with code examples
+- Benefits and use cases
+- Architecture diagrams
+- Pack structure changes
+
+### 4. Example Workflows ✅
+
+**Simple Example** - `docs/examples/simple-workflow.yaml` (68 lines):
+- Basic sequential workflow
+- Variable publishing
+- Template usage
+- Easy learning resource
+
+**Complex Example** - `docs/examples/complete-workflow.yaml` (710 lines):
+- Production-ready deployment workflow
+- All features demonstrated:
+  - Sequential and parallel execution
+  - Conditional branching (production approval)
+  - Human-in-the-loop (inquiry tasks)
+  - Iteration with batching (multi-region deployment)
+  - Error handling and retry
+  - Rollback procedures
+  - Multiple notification paths
+- Real-world scenario: CI/CD deployment pipeline
+
+### 5. Database Migration ✅
+
+Created `docs/examples/workflow-migration.sql` (225 lines):
+- Complete schema for 3 new tables
+- Indexes and triggers
+- Helper views for monitoring
+- Rollback support
+- Comprehensive comments
+
+### 6. TODO.md Integration ✅
+
+Updated `work-summary/TODO.md`:
+- Expanded Phase 8.1 (Workflow Orchestration) with detailed task breakdown
+- 250 lines of granular implementation tasks across 5 phases
+- Success criteria and deliverables for each phase
+- Updated timeline estimates (Phase 8: 13-15 weeks total)
+- Added workflow documentation references
+- Updated project timeline to 9-12 months total
+
+### 7. Database Migration Implementation ✅
+
+Created and applied migration `migrations/20250127000002_workflow_orchestration.sql`:
+- ✅ Created 3 new tables (workflow_definition, workflow_execution, workflow_task_execution)
+- ✅ Modified action table with is_workflow and workflow_def columns
+- ✅ Added all indexes for performance
+- ✅ Added triggers for timestamp updates
+- ✅ Created 3 helper views (workflow_execution_summary, workflow_task_detail, workflow_action_link)
+- ✅ Applied migration successfully to database
+- ✅ Verified all tables, columns, indexes, and views created correctly
+
+---
+
+## Key Design Decisions
+
+### 1. Workflows as Actions
+- **Decision**: Workflows are first-class actions with `is_workflow=true` flag
+- **Rationale**: 
+  - Can be triggered by rules (event-driven)
+  - Can be invoked by other workflows (composable)
+  - Can be executed directly via API
+  - Leverages existing execution infrastructure
+  - No special handling required in most of the system
+
+### 2. YAML-Based Definitions
+- **Decision**: Declarative YAML files in pack directories
+- **Rationale**:
+  - Human-readable and easy to author
+  - Version-controllable (Git-friendly)
+  - Industry standard (similar to GitHub Actions, Argo, etc.)
+  - Portable across environments
+  - Can be validated before execution
+
+### 3. Event-Driven Execution
+- **Decision**: Asynchronous execution via existing message queue
+- **Rationale**:
+  - Leverages existing RabbitMQ infrastructure
+  - No blocking or polling required
+  - Natural fit with Attune's architecture
+  - Scalable and distributed
+  - Each task is a regular execution with full tracing
+
+### 4. Multi-Scope Variable System
+- **Decision**: 6 scopes with precedence order
+- **Rationale**:
+  - Flexible variable access patterns
+  - Clear precedence rules prevent confusion
+  - Supports all common use cases:
+    - Task results (`task.build.result.image_uri`)
+    - Workflow state (`vars.deployment_id`)
+    - User inputs (`parameters.app_name`)
+    - Pack configuration (`pack.config.api_key`)
+    - System context (`system.identity.login`)
+    - Global state (`kv.get('feature.flags')`)
+
+### 5. Tera Template Engine
+- **Decision**: Use Tera crate for templating
+- **Rationale**:
+  - Jinja2-like syntax (familiar to users)
+  - Compile-time template validation
+  - Rust-native (no FFI overhead)
+  - Extensible with custom filters/functions
+  - Good performance with caching
+
+---
+
+## Core Features Designed
+
+1. **Sequential Execution** - Tasks execute in order with transitions
+2. **Parallel Execution** - Multiple tasks run concurrently
+3. **Conditional Branching** - Decision trees based on task results
+4. **Iteration (with-items)** - Process lists with optional batching
+5. **Variable Publishing** - Tasks publish results to workflow scope
+6. **Error Handling & Retry** - Built-in retry with exponential backoff
+7. **Human-in-the-Loop** - Inquiry tasks for approvals
+8. **Nested Workflows** - Workflows can invoke other workflows
+9. **Timeout Management** - Per-task timeouts with handlers
+10. **Pause/Resume** - Workflow execution control
+11. **Cancellation** - Stop workflows mid-execution
+
+---
+
+## Database Schema Changes
+
+### New Tables
+
+1. **`workflow_definition`**
+   - Stores parsed workflow YAML as JSON
+   - Links to pack
+   - Contains parameter/output schemas
+   - Version and metadata
+
+2. **`workflow_execution`**
+   - Runtime state of workflow
+   - Variable context (JSONB)
+   - Task completion tracking (arrays)
+   - Status and error information
+
+3. **`workflow_task_execution`**
+   - Individual task execution records
+   - Supports iteration (task_index, task_batch)
+   - Retry tracking
+   - Result and error storage
+
+### Modified Tables
+
+- **`action`** table:
+  - Add `is_workflow BOOLEAN` column
+  - Add `workflow_def BIGINT` foreign key
+
+---
+
+## API Endpoints Designed
+
+### Workflow Management (8 endpoints)
+- Create, list, get, update, delete workflows
+- Execute workflow directly
+- Validate workflow definition
+
+### Execution Management (7 endpoints)
+- List, get workflow executions
+- Get task list, graph, context
+- Pause, resume, cancel, retry workflows
+
+---
+
+## Implementation Timeline
+
+**Total: 9 weeks**
+
+- **Week 1-2**: Foundation (DB, models, parser, templates)
+- **Week 3-4**: Execution Engine (graph, executor, messages)
+- **Week 5-6**: Advanced Features (iteration, parallel, retry)
+- **Week 7-8**: API & Tools (endpoints, validation, pack integration)
+- **Week 9**: Testing & Documentation
+
+---
+
+## Dependencies
+
+### New Crates Required
+- **tera** (^1.19) - Template engine
+- **petgraph** (^0.6) - Graph data structures (optional, can use custom)
+
+### Existing Crates
+- sqlx - Database access
+- serde/serde_json - Serialization
+- tokio - Async runtime
+- lapin - RabbitMQ client
+
+---
+
+## Success Metrics
+
+The workflow implementation will be considered successful when:
+
+1. ✅ Workflows defined in YAML and registered via packs
+2. ✅ All execution patterns work (sequential, parallel, conditional, iteration)
+3. ✅ Variables properly scoped and templated
+4. ✅ Error handling and retry functional
+5. ✅ Human-in-the-loop integration seamless
+6. ✅ Nested workflows execute correctly
+7. ✅ API provides full CRUD and control
+8. ✅ Comprehensive test coverage
+9. ✅ Documentation enables easy workflow authoring
+10. ✅ Performance meets requirements (graph caching, template caching)
+11. ✅ Security considerations addressed (template injection, resource limits)
+
+---
+
+## Documentation Deliverables
+
+All documentation complete and ready for implementation:
+
+1. **Technical Design**: `docs/workflow-orchestration.md`
+2. **Implementation Plan**: `docs/workflow-implementation-plan.md`
+3. **Executive Summary**: `docs/workflow-summary.md`
+4. **Simple Example**: `docs/examples/simple-workflow.yaml`
+5. **Complex Example**: `docs/examples/complete-workflow.yaml`
+6. **Migration Script**: `docs/examples/workflow-migration.sql`
+7. **TODO Integration**: `work-summary/TODO.md` updated with 250 lines of tasks
+
+---
+
+## Next Steps
+
+1. **Review & Feedback**: Present design to stakeholders
+2. **Prioritization**: Confirm 9-week timeline or adjust scope
+3. **Project Setup**: Create GitHub issues/milestones for 5 phases
+4. **Begin Phase 1**: Start with database migration and models
+5. **Weekly Reviews**: Schedule progress check-ins
+
+---
+
+## References
+
+- **Full Design**: `docs/workflow-orchestration.md` (1,063 lines)
+- **Implementation Plan**: `docs/workflow-implementation-plan.md` (562 lines)
+- **Quick Reference**: `docs/workflow-summary.md` (400 lines)
+- **Examples**: `docs/examples/simple-workflow.yaml`, `docs/examples/complete-workflow.yaml`
+- **Migration**: `docs/examples/workflow-migration.sql` (225 lines)
+- **Task List**: `work-summary/TODO.md` Phase 8.1
+
+---
+
+## Notes
+
+- This is a significant feature addition that will position Attune as a comprehensive automation platform comparable to StackStorm, Argo Workflows, and AWS Step Functions
+- The design leverages existing infrastructure (message queue, execution model) minimizing architectural changes
+- YAML-based approach is industry-standard and user-friendly
+- Implementation can proceed incrementally - basic workflows first, advanced features later
+- All design decisions documented with rationale for future reference
+
+---
+
+## Implementation Progress
+
+### Phase 1: Foundation (Week 1-2) - IN PROGRESS
+
+#### Completed Tasks ✅
+1. **Database Migration** (2026-01-27)
+   - Created migration file: `migrations/20250127000002_workflow_orchestration.sql`
+   - Applied migration successfully
+   - Verified schema:
+     - ✅ `workflow_definition` table (14 columns)
+     - ✅ `workflow_execution` table with status tracking
+     - ✅ `workflow_task_execution` table with retry/timeout support
+     - ✅ `action` table modifications (is_workflow, workflow_def)
+     - ✅ All indexes created
+     - ✅ All triggers created
+     - ✅ 3 helper views created
+
+#### Next Tasks 📋
+2. Add workflow models to `common/src/models.rs`
+3. Create workflow repositories
+4. Implement YAML parser
+5. Integrate template engine
+
+---
+
+**Status**: ✅ Design complete. 🔄 Phase 1 implementation started (database migration complete).