# Product Roadmap Module - SQLite Migration Summary

## Overview
The product-roadmap module has been successfully migrated from file-based JSON storage to SQLite database storage, following the 12-factor MCP pattern established by other migrated modules.

## What Was Implemented

### 1. SQLite Schema (src/storage/schema.sql)
Added comprehensive database schema for product roadmap data:
- `product_roadmaps` - Main roadmap table with vision, time horizon, owner
- `roadmap_themes` - Strategic themes with objectives and priorities
- `roadmap_initiatives` - Product initiatives with value metrics and effort estimates
- `roadmap_features` - Features with business value and technical complexity
- `roadmap_milestones` - Key milestones with deliverables and dependencies
- `roadmap_releases` - Product releases with feature lists and goals
- `roadmap_reviews` - Roadmap review records with decisions and feedback

All tables include proper foreign key constraints, indexes for performance, and timestamp tracking.

### 2. Tools Implementation (tools.ts)
Implemented all 14 product roadmap tools using the 12-factor pattern:
- `create_roadmap` - Create new product roadmaps
- `add_roadmap_theme` - Add strategic themes
- `create_initiative` - Create initiatives within themes
- `add_feature` - Add features to initiatives
- `update_feature_status` - Update feature lifecycle status
- `update_initiative_status` - Update initiative status
- `create_milestone` - Create roadmap milestones
- `plan_release` - Plan product releases
- `prioritize_features` - Feature prioritization (RICE, MoSCoW, etc.)
- `generate_roadmap_timeline` - Generate timeline views
- `list_roadmaps` - List all roadmaps
- `get_roadmap` - Get detailed roadmap information
- `get_theme_details` - Get theme details with initiatives/features
- `get_roadmap_health` - Assess roadmap health metrics

Each tool:
- Uses structured input/output schemas with JSON Schema validation
- Implements proper error handling with structured error results
- Returns deterministic, LLM-friendly responses
- Maintains stateless execution per 12-factor principles

### 3. Module Setup (index-new.ts)
Created the new module entry point that exports the standardized ModuleSetup interface.

### 4. MCP Adapter (mcp-adapter.ts)
Built an adapter that:
- Converts 12-factor tools to MCP SDK format
- Handles request context creation with database access
- Formats tool results as readable text for LLM consumption
- Provides proper error handling and reporting

### 5. Legacy Wrapper (legacy-wrapper.ts)
Maintains backward compatibility by wrapping the old file-based implementation.

### 6. Migration Logic (storage/migration.ts)
Added `migrateProductRoadmapData` method that:
- Migrates existing roadmap JSON files
- Handles all entity types (themes, initiatives, features, etc.)
- Preserves relationships and data integrity
- Maintains timestamps and metadata

### 7. Server Integration (server.ts)
Updated the server to:
- Try loading the new SQLite-based module first
- Fall back to legacy implementation if needed
- Initialize SQLiteManager for database access
- Pass proper context to tools

## Key Design Decisions

1. **Stateless Tools**: Each tool execution is completely stateless, receiving all needed context in the request.

2. **Structured Errors**: All errors follow a consistent structure with codes, messages, details, and recovery suggestions.

3. **Foreign Key Integrity**: All relationships are enforced at the database level for data consistency.

4. **JSON Storage**: Complex data like objectives, risks, and metrics are stored as JSON strings in the database.

5. **Timestamp Tracking**: All entities track creation and update timestamps as Unix milliseconds.

6. **Project Isolation**: All roadmap data is scoped to projects via foreign key constraints.

## Migration Benefits

1. **Performance**: SQLite queries are much faster than file system operations
2. **Data Integrity**: Foreign key constraints ensure referential integrity
3. **Atomicity**: Database transactions ensure data consistency
4. **Querying**: Complex queries and aggregations are now possible
5. **Scalability**: Can handle large numbers of roadmaps and features efficiently
6. **Concurrent Access**: SQLite handles concurrent reads properly

## Testing Considerations

The module can be tested by:
1. Enabling the product-roadmap module in configuration
2. Creating a project first (required by foreign keys)
3. Using the roadmap tools through the MCP interface
4. Checking that data persists in the SQLite database

## Future Enhancements

1. Add visualization support for timeline views
2. Implement advanced analytics and reporting
3. Add integration with agile management module
4. Support for roadmap templates
5. Export/import functionality for roadmap sharing