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docs: complete project research

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Files:
- STACK.md
- FEATURES.md
- ARCHITECTURE.md
- PITFALLS.md
- SUMMARY.md

Key findings:
- Stack: React, Node.js, PostgreSQL, Prisma
- Architecture: Layered with clear component boundaries
- Critical pitfall: Inconsistent calendar sync behavior
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# Architecture Patterns # Architecture Patterns
**Domain:** Weekly Scheduler with Calendar Integration **Domain:** Weekly Task Management Application
**Researched:** Sat Jan 24 2026 **Researched:** January 24, 2026
## Recommended Architecture ## Recommended Architecture
A weekly scheduler with calendar integration typically follows a component-based architecture with clear separation between UI presentation, data management, and external integrations. A weekly task management application with calendar integration follows a layered architecture pattern with distinct component boundaries. The architecture consists of:
The core architecture consists of: 1. **Frontend Layer** - User interface for weekly view, drag-and-drop functionality, and calendar integration
2. **Backend Layer** - API services for task and calendar data management
3. **Data Layer** - Database for storing tasks, events, and user preferences
4. **Integration Layer** - Services for Apple Calendar and Google Calendar synchronization
1. **Presentation Layer** - Responsible for rendering the weekly schedule grid This structure enables scalability, maintainability, and supports the core requirement of displaying tasks and events in a single weekly view.
2. **Data Management Layer** - Handles task storage, retrieval, and organization
3. **Calendar Integration Layer** - Manages connections to external calendar services
4. **Business Logic Layer** - Manages scheduling rules and workflows
### Component Boundaries ### Component Boundaries
| Component | Responsibility | Communicates With | | Component | Responsibility | Communicates With |
|-----------|---------------|-------------------| |-----------|---------------|-------------------|
| Weekly View Component | Renders the weekly schedule grid with days and time slots | Task Data Store, Navigation Controls | | **Frontend** | User interface rendering, drag-and-drop operations, weekly view display | Backend API, Integration Layer |
| Task List Component | Displays tasks for a specific week/day | Data Store, Task Creation Form | | **Backend API** | Business logic, task/event management, authentication | Database, Integration Layer |
| Task Creation Form | Handles creating/editing tasks with validation | Data Store, Validation Layer | | **Database** | Persistent storage of tasks, events, calendar integrations, user data | Backend API |
| Navigation Controls | Manage week navigation (previous/next week) | Data Store, Week Calculator | | **Calendar Integration** | Sync with Apple Calendar and Google Calendar | Backend API, External Calendar APIs |
| Data Store | Centralized storage and management of tasks and schedule data | Persistence Layer, UI Components |
| Persistence Layer | Handles local storage or database operations | Data Store, External Sync |
| Calendar Sync Service | Manages integration with external calendars (Google, Apple) | Calendar APIs, Data Store |
| Week Calculation Service | Handles date calculations and week boundary logic | Navigation Components, Data Store |
| Validation Layer | Validates task data before saving | Form Components, Data Store |
### Data Flow ### Data Flow
1. **User Interaction**: User interacts with UI (clicking days, creating tasks) 1. User interacts with weekly view in frontend (drag-and-drop, add/remove tasks)
2. **Component Updates**: UI components update state or dispatch actions 2. Frontend communicates changes to Backend API via RESTful services
3. **Data Processing**: Business logic processes task creation/update/deletion 3. Backend API processes business logic and validates data
4. **Storage Operation**: Data Store coordinates with persistence layer 4. Backend accesses Database for storage/retrieval of task/event data
5. **External Sync**: Calendar sync service handles external calendar integration 5. For external calendar sync, Backend API communicates with Calendar Integration Layer
6. **UI Refresh**: Changes propagate back to UI through state updates 6. Calendar Integration Layer manages OAuth flows and data synchronization
7. Updates are pushed back to frontend for immediate UI refresh
## Patterns to Follow ## Patterns to Follow
### Pattern 1: Component-Based Architecture ### Pattern 1: Layered Architecture
**What:** Break the application into reusable, self-contained components **What:** Separation of concerns into distinct layers (presentation, business logic, data)
**When:** For maintainability and scalability of UI elements **When:** For scalable, maintainable codebase
**Example:**
```jsx
// WeeklyView Component
function WeeklyView({ tasks, onTaskSelect, onTaskCreate }) {
return (
<div className="weekly-view">
<WeekNavigation />
<DayColumns tasks={tasks} />
</div>
);
}
```
### Pattern 2: State Management with Context API or Similar
**What:** Centralized state management for task data and UI state
**When:** When multiple components need access to the same data
**Example:** **Example:**
```javascript ```javascript
const TaskContext = createContext(); // Frontend layer
const WeeklyView = () => {
// Renders weekly view with task/event cards
}
function TaskProvider({ children }) { // Backend layer
const [tasks, setTasks] = useState([]); const TaskService = {
async createTask(taskData) {
return ( // Business logic validation
<TaskContext.Provider value={{ tasks, setTasks }}> const task = await database.saveTask(taskData);
{children} return task;
</TaskContext.Provider> }
);
} }
``` ```
### Pattern 3: Observer Pattern for Calendar Sync ### Pattern 2: Observer Pattern for Real-time Updates
**What:** Event-driven architecture for keeping data synchronized **What:** Components notify each other of changes in real-time
**When:** For external calendar integration and real-time updates **When:** For synchronous updates between frontend and backend when tasks are moved
**Example:**
```javascript
// Event emitter for task movement
const taskEmitter = new EventEmitter();
taskEmitter.on('taskMoved', (taskId, newDay) => {
// Update UI immediately
updateWeekView(taskId, newDay);
});
```
### Pattern 3: Service Layer for Calendar Integration
**What:** Encapsulate external calendar API interactions in dedicated services
**When:** For managing multiple calendar providers and complex sync logic
**Example:** **Example:**
```javascript ```javascript
class CalendarSyncService { class CalendarSyncService {
constructor() { async syncWithGoogle(calendarEvents) {
this.observers = []; // Handle Google Calendar OAuth flow
// Update local DB with synced events
} }
subscribe(observer) { async syncWithApple(calendarEvents) {
this.observers.push(observer); // Handle Apple Calendar integration
} // Update local DB with synced events
notifyObservers(change) {
this.observers.forEach(obs => obs.update(change));
} }
} }
``` ```
## Anti-Patterns to Avoid ## Anti-Patterns to Avoid
### Anti-Pattern 1: Monolithic Component Structure ### Anti-Pattern 1: Monolithic Frontend
**What:** Having one massive component that handles everything **What:** All UI logic bundled in single files without separation
**Why bad:** Makes code hard to maintain, debug, and test **Why bad:** Makes maintenance difficult as application grows
**Instead:** Break into smaller, focused components **Instead:** Use component-based architecture with clear separation of concerns
### Anti-Pattern 2: Direct DOM Manipulation ### Anti-Pattern 2: Direct Database Access
**What:** Interacting directly with DOM elements instead of using state management **What:** Frontend components querying database directly
**Why bad:** Breaks React's declarative model, leads to unpredictable UI states **Why bad:** Security vulnerabilities, tight coupling, scalability issues
**Instead:** Use React state and props for all UI changes **Instead:** Use API layer to mediate all data access
### Anti-Pattern 3: Inconsistent Data Flow ### Anti-Pattern 3: Inconsistent Calendar Sync Logic
**What:** Mixing different state management patterns throughout the app **What:** Different sync approaches for different calendar providers
**Why bad:** Makes code hard to reason about and maintain **Why bad:** Leads to data inconsistency and user confusion
**Instead:** Choose one consistent pattern (Context API, Redux, or Jotai) **Instead:** Implement standardized sync protocols with clear error handling
## Scalability Considerations ## Scalability Considerations
| Concern | At 100 users | At 10K users | At 1M users | | Concern | At 100 users | At 10K users | At 1M users |
|---------|--------------|--------------|-------------| |---------|--------------|--------------|-------------|
| UI Rendering | Standard rendering | Virtualized lists for performance | Server-side rendering + caching | | Task Creation/Updates | Local caching with optimistic updates | Load balancer with database connection pooling | CDN for static assets, sharded database |
| Data Storage | Client-side storage (localStorage) | Backend database with indexing | Distributed database with sharding | | Calendar Integration | Single-threaded sync per user | Parallel sync workers | Distributed sync services, queue processing |
| Calendar Sync | Client-side polling | Background sync jobs | Asynchronous processing queues | | Concurrent Drag-and-Drop | Immediate updates with local state | Server-synchronized updates with conflict resolution | Real-time WebSocket connections for instant updates |
| Concurrent Access | Single user context | Multi-user isolation | Database transactions with locking |
## Sources ## Sources
- React-based calendar application architecture patterns - General software architecture principles from Martin Fowler's writings
- Modern web application design principles - Layered architecture patterns commonly used in web applications
- Calendar integration best practices (Google Calendar API, Apple Calendar API) - Task management application design patterns from industry best practices
- Component-based architecture guidelines for scalable frontend development

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# Feature Landscape # Feature Landscape
**Domain:** Weekly Scheduler with Calendar Integration **Domain:** Weekly Task Management Application
**Researched:** Sat Jan 24 2026 **Researched:** January 24, 2026
## Table Stakes ## Table Stakes
@ -9,14 +9,12 @@ Features users expect. Missing = product feels incomplete.
| Feature | Why Expected | Complexity | Notes | | Feature | Why Expected | Complexity | Notes |
|---------|--------------|------------|-------| |---------|--------------|------------|-------|
| Weekly view display | Core functionality - primary user interface | Low | User needs to see tasks organized by week | | Weekly View Display | Core requirement - users need to see tasks in a weekly format | Low | Should show days of the week with time slots |
| Task creation/editing | Essential workflow for any task manager | Low | Users must be able to add and modify tasks | | Task Creation/Editing | Basic functionality for adding and modifying tasks | Low | Simple form with title, time, and description |
| Task deletion | Basic CRUD functionality | Low | Users need to remove tasks they no longer need | | Task Deletion | Essential for task management | Low | Must be easy to remove tasks |
| Day navigation | Core usability feature | Low | Users need to move between weeks | | Day Navigation | Ability to move between weeks | Low | Previous/next week buttons |
| Responsive design | Modern expectation for web apps | Low | Works on mobile, tablet, and desktop | | Drag-and-Drop Between Days | Primary interaction pattern for reorganizing tasks | Medium | Smooth UI experience required |
| Local storage persistence | Offline access and data retention | Low | Keeps data available between sessions | | Calendar Integration | Key differentiator - sync with external calendars | High | Support Google and Apple calendars |
| Drag and drop reordering | Intuitive interaction pattern | Medium | Improves task organization workflow |
| Date/time selection | Essential for task scheduling | Low | Users need to assign time slots to tasks |
## Differentiators ## Differentiators
@ -24,12 +22,11 @@ Features that set product apart. Not expected, but valued.
| Feature | Value Proposition | Complexity | Notes | | Feature | Value Proposition | Complexity | Notes |
|---------|-------------------|------------|-------| |---------|-------------------|------------|-------|
| Calendar integration (Google/Apple) | Sync with existing calendar systems to avoid duplicate entries | High | Adds significant user value by connecting with established workflows | | Combined Task/Event View | Users can see both tasks and calendar events in same view | Medium | Reduces cognitive load of switching between apps |
| Theme customization | Personalization enhances user satisfaction and retention | Low | Small visual improvement that increases user connection | | Smart Scheduling Suggestions | AI-powered suggestions for optimal task timing | High | Advanced feature that adds significant value |
| Recurring tasks | Saves time for regular activities | Medium | Advanced scheduling feature that users appreciate | | Theme Customization | Visual personalization options | Low | Small but appreciated feature |
| Task categories/tags | Better organization and filtering | Medium | Helps users manage complex task sets | | Recurring Tasks | Repeat tasks weekly/monthly | Medium | Important for routine activities |
| Reminder notifications | Helps users stay on schedule | Medium | Adds utility beyond simple task tracking | | Priority Levels | Color coding or labels for task urgency | Low | Easy to implement but valuable for organization |
| Export/import functionality | Data portability and backup | Medium | Allows data migration and backup options |
## Anti-Features ## Anti-Features
@ -37,18 +34,18 @@ Features to explicitly NOT build. Common mistakes in this domain.
| Anti-Feature | Why Avoid | What to Do Instead | | Anti-Feature | Why Avoid | What to Do Instead |
|--------------|-----------|-------------------| |--------------|-----------|-------------------|
| Complex permission system | Overcomplicates basic task management | Keep it simple with single-user focus | | Multi-user Collaboration | Distracts from single-user focus | Keep it simple and personal |
| Email notifications | Noise and distraction for users | Consider only if specifically requested | | Complex Filtering/Searching | Overcomplicates the core experience | Focus on simple task management |
| Multi-user collaboration | Expands scope beyond MVP | Focus on individual task management first | | Reporting Analytics | Doesn't align with core objective | Defer to post-MVP or optional |
| Advanced reporting analytics | Increases complexity without immediate value | Defer to later phases if needed | | Email Integration | Not part of task management focus | Keep it focused on calendar and tasks |
| Desktop Application | Overextends scope | Maintain web-based simplicity |
## Feature Dependencies ## Feature Dependencies
``` ```
[Day Navigation] → [Weekly View Display] (Week view needs navigation) [Core UI] → [Backend API] → [Database] → [Calendar Integration]
[Task Creation] → [Task Storage] (Need storage to save tasks) [Drag-and-Drop] depends on [Core UI] and [Backend API]
[Calendar Integration] → [Task Storage] (Requires data to sync with calendar) [Calendar Integration] depends on [Backend API] and [Database]
[Drag & Drop] → [Task Storage] (Needs to persist reordered tasks)
``` ```
## MVP Recommendation ## MVP Recommendation
@ -57,16 +54,17 @@ For MVP, prioritize:
1. Weekly view display 1. Weekly view display
2. Task creation/editing/deletion 2. Task creation/editing/deletion
3. Day navigation 3. Day navigation
4. Local storage persistence 4. Drag-and-drop between days
Defer to post-MVP: Defer to post-MVP:
- Calendar integration - Calendar integration (Google/Apple)
- Smart scheduling suggestions
- Recurring tasks - Recurring tasks
- Theme customization - Theme customization
- Reminder notifications
## Sources ## Sources
- Competitor analysis: TeuxDeux, Tweek.so, Google Tasks - Industry analysis of popular task management applications
- User experience research (2025) - User research on calendar integration needs
- Task management applications market trends - Feature comparison studies of productivity tools
- UX design patterns for task management interfaces

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# Domain Pitfalls # Domain Pitfalls
**Domain:** Weekly Scheduler with Calendar Integration **Domain:** Weekly Task Management Application
**Researched:** Sat Jan 24 2026 **Researched:** January 24, 2026
## Critical Pitfalls ## Critical Pitfalls
Mistakes that cause rewrites or major issues. Mistakes that cause rewrites or major issues.
### Pitfall 1: Inconsistent Date/Time Handling ### Pitfall 1: Inconsistent Calendar Sync Behavior
**What goes wrong:** Applications incorrectly handle time zones, daylight saving transitions, and date math, leading to tasks appearing on wrong days or times. **What goes wrong:** Calendar synchronization behaves differently for Google vs Apple calendars, causing data discrepancies and user frustration.
**Why it happens:** Complex timezone libraries are often misconfigured or developers don't understand the nuances of temporal calculations. **Why it happens:** Lack of standardized sync protocols and inconsistent handling of calendar event properties.
**Consequences:** Users lose trust in the system, tasks appear at wrong times, recurring events break. **Consequences:** Users lose trust in the application, data integrity issues, support burden.
**Prevention:** Use robust timezone libraries (like moment-timezone or Luxon), implement thorough testing for edge cases, clearly define time zones in user profiles. **Prevention:** Implement a unified calendar abstraction layer that normalizes event properties across providers.
**Detection:** Look for reports of tasks appearing on wrong days, time discrepancies, or recurrence issues, especially around DST transitions. **Detection:** Monitor user complaints about missing events, duplicate events, or incorrect time placements.
### Pitfall 2: Poor Event Conflict Resolution ### Pitfall 2: Poor Drag-and-Drop Performance
**What goes wrong:** When multiple tasks are scheduled for the same time slot, the system doesn't handle conflicts gracefully. **What goes wrong:** Drag-and-drop operations lag or feel unresponsive, especially with many tasks.
**Why it happens:** Lack of proper conflict detection and resolution logic, or overly simplistic merging algorithms. **Why it happens:** Inefficient DOM manipulation or blocking UI updates during drag operations.
**Consequences:** Loss of task data, incorrect scheduling, and poor user experience. **Consequences:** Frustrated users, perception of application slowness, abandonment.
**Prevention:** Implement clear conflict resolution rules (priority-based, user-selectable, etc.), provide visual indicators of conflicts in UI. **Prevention:** Implement virtual scrolling, optimize DOM updates, use CSS transitions for smooth animations.
**Detection:** Monitor for user complaints about missing or duplicated tasks, unexpected scheduling changes. **Detection:** User testing feedback, performance monitoring tools, analytics on drag operation duration.
### Pitfall 3: Inadequate Offline Support ### Pitfall 3: Data Loss Due to Local Storage Issues
**What goes wrong:** The application fails to function properly when offline or experiences network interruptions. **What goes wrong:** User data is lost when browser cache is cleared or localStorage becomes corrupted.
**Why it happens:** Ignoring offline capabilities during development or implementing flaky synchronization logic. **Why it happens:** Relying solely on client-side storage without backup mechanisms.
**Consequences:** User frustration, data loss during connectivity issues, reduced usability in unreliable environments. **Consequences:** User frustration, loss of trust, potential product abandonment.
**Prevention:** Implement robust offline-first architecture with local storage and intelligent sync strategies, design clear user feedback for connectivity issues. **Prevention:** Implement data backup strategies and provide export/import functionality.
**Detection:** User feedback about disappearing tasks, inability to create/edit tasks offline, or data inconsistencies after connectivity restoration. **Detection:** User reports of lost data, monitoring of localStorage errors.
### Pitfall 4: Calendar Integration Fragility
**What goes wrong:** Third-party calendar integrations (Google, Apple) fail or become broken due to API changes or permission issues.
**Why it happens:** Relying on unstable external APIs without proper error handling, insufficient testing across different calendar providers, ignoring breaking changes.
**Consequences:** Users lose ability to sync tasks, data inconsistency between systems, potential security issues.
**Prevention:** Implement proper error handling for API failures, use versioned API calls when available, design graceful degradation when integrations fail, maintain proper permission management.
**Detection:** Reports of sync failures, lost calendar events, or inability to connect to calendar services.
## Moderate Pitfalls ## Moderate Pitfalls
Mistakes that cause delays or technical debt. Mistakes that cause delays or technical debt.
### Pitfall 1: Overcomplicated UI for Simple Tasks ### Pitfall 1: Overcomplicating the UI
**What goes wrong:** The interface becomes cluttered with unnecessary options, making basic task management difficult. **What goes wrong:** Adding too many features or complex interfaces that overwhelm users.
**Why it happens:** Feature creep during development without continuous user feedback or design iteration. **Prevention:** Stick to minimal viable product principles, conduct regular user testing.
**Consequences:** User confusion, increased learning curve, decreased adoption rates.
**Prevention:** Follow minimal viable product principles, conduct regular user testing, prioritize essential features.
**Detection:** User feedback indicating confusion, low engagement with core features, excessive time spent on simple operations.
### Pitfall 2: Inefficient Data Storage and Retrieval ### Pitfall 2: Inadequate Error Handling
**What goes wrong:** As the application grows, database queries become slow, affecting application responsiveness. **What goes wrong:** Application crashes or freezes when encountering unexpected inputs or network issues.
**Why it happens:** Poor schema design, lack of indexing, inefficient data structures for weekly views. **Prevention:** Implement comprehensive error boundaries and graceful degradation strategies.
**Consequences:** Slow loading times, poor user experience, scalability issues.
**Prevention:** Design with performance in mind from the beginning, implement proper indexing, consider data partitioning for large datasets, optimize queries.
**Detection:** User complaints about slow performance, performance monitoring showing slow database queries.
### Pitfall 3: Inadequate Recurrence Logic
**What goes wrong:** Recurring tasks behave unexpectedly or fail to update properly.
**Why it happens:** Misunderstanding recurrence patterns, inadequate testing of edge cases.
**Consequences:** Users miss important recurring tasks, incorrect scheduling behavior.
**Prevention:** Implement comprehensive recurrence testing, validate user inputs for recurrence patterns, provide clear recurrence previews.
**Detection:** Reports of missed recurring tasks, incorrect recurrence behavior, user confusion about recurring event updates.
## Minor Pitfalls ## Minor Pitfalls
Mistakes that cause annoyance but are fixable. Mistakes that cause annoyance but are fixable.
### Pitfall 1: Unclear Visual Indicators for Task Status ### Pitfall 1: Inconsistent Time Zone Handling
**What goes wrong:** Users struggle to distinguish between completed, upcoming, and overdue tasks visually. **What goes wrong:** Tasks display in incorrect time zones when users travel or have mixed time zone calendars.
**Why it happens:** Lack of consistent color coding or visual hierarchy in UI design. **Prevention:** Implement robust time zone handling with clear user preferences.
**Consequences:** Reduced task awareness, difficulty scanning tasks quickly.
**Prevention:** Establish clear visual language for task states, maintain consistency across the interface.
**Detection:** User feedback about difficulty tracking task status, frequent requests for "mark as complete" functionality.
### Pitfall 2: Suboptimal Keyboard Navigation ### Pitfall 2: Poor Responsive Design
**What goes wrong:** Application lacks keyboard shortcuts or intuitive keyboard navigation. **What goes wrong:** Application doesn't work well on mobile devices or smaller screens.
**Why it happens:** Focus on mouse-based interaction during development. **Prevention:** Design with mobile-first approach and test across multiple screen sizes.
**Consequences:** Reduced productivity for power users, accessibility issues.
**Prevention:** Implement keyboard-friendly navigation, provide discoverable keyboard shortcuts.
**Detection:** User requests for keyboard shortcuts, accessibility compliance issues.
## Phase-Specific Warnings ## Phase-Specific Warnings
| Phase Topic | Likely Pitfall | Mitigation | | Phase Topic | Likely Pitfall | Mitigation |
|-------------|---------------|------------| |-------------|---------------|------------|
| Planning & Setup | Inadequate user onboarding | Implement guided walkthroughs for first-time users | | Frontend Development | Component architecture becomes unwieldy | Plan component structure early, establish clear component boundaries |
| Core Features | Inconsistent date/time handling | Implement extensive date/time testing and validation | | Backend API Design | Inflexible API endpoints | Design flexible, extensible API from start, version when changes necessary |
| Calendar Sync | Integration fragility | Build comprehensive test suite for external APIs | | Database Implementation | Schema changes cause downtime | Plan database migrations carefully, use versioned schema management |
| UI/UX Implementation | Overcomplicated interface | Conduct frequent user testing and simplify iteratively | | Calendar Integration | OAuth token expiration issues | Implement automatic refresh mechanisms and clear error handling |
| User Testing | Insufficient user feedback loop | Establish regular user interviews and feedback collection mechanisms |
## Sources ## Sources
- Community insights from calendar app design forums and UX communities - Post-mortems from popular task management applications
- Industry analysis of popular calendar applications (Google Calendar, Apple Calendar, Outlook) - Issue discussions in open-source task management projects
- Common issues reported in developer forums and Stack Overflow - Community feedback on productivity tools
- Academic research on temporal data handling in distributed systems - UX research on calendar integration challenges
- Post-mortems from calendar application failures - Developer forums discussing web application performance bottlenecks

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# Technology Stack # Technology Stack
**Project:** Weekly Scheduler with Calendar Integration **Project:** Weekly Task Management App
**Researched:** Sat Jan 24 2026 **Researched:** January 24, 2026
## Recommended Stack ## Recommended Stack
### Core Framework ### Core Framework
| Technology | Version | Purpose | Why | | Technology | Version | Purpose | Why |
|------------|---------|---------|-----| |------------|---------|---------|-----|
| React | 18.3+ | UI Library | Component-based architecture with hooks and context API | | React | 18.x | Frontend UI framework | Component-based architecture, strong ecosystem, excellent for UI-heavy applications |
| Next.js | 16+ | Server-side rendering and routing | Optimized for performance and SEO with modern features | | Node.js | 18.x | Backend runtime | Mature ecosystem, good performance, large community support |
| TypeScript | 5.4+ | Type safety | Prevents runtime errors and improves developer experience | | Express.js | 4.x | Web framework | Lightweight, flexible API development, widely adopted |
### Database ### Database
| Technology | Version | Purpose | Why | | Technology | Version | Purpose | Why |
|------------|---------|---------|-----| |------------|---------|---------|-----|
| localStorage | Native | Client-side storage | Fast, immediate access for local tasks | | PostgreSQL | 14+ | Relational database | ACID compliance, strong data integrity, excellent for structured data like tasks |
| IndexedDB | Native | Alternative local storage | Better for larger datasets or complex queries | | Prisma | 5.x | ORM | Type-safe database access, migration management, reduces boilerplate |
| PostgreSQL | 15+ | Server-side storage (optional) | Robust relational database for user data |
### Infrastructure ### Infrastructure
| Technology | Version | Purpose | Why | | Technology | Version | Purpose | Why |
|------------|---------|---------|-----| |------------|---------|---------|-----|
| Tailwind CSS | 3.4+ | Styling | Utility-first CSS framework for rapid UI development | | Vercel | Latest | Deployment platform | Seamless React deployment, automatic CI/CD, global CDN |
| TanStack Query | 5.0+ | Data fetching | Efficient server state management and caching | | Supabase | Latest | Backend-as-a-Service | Provides auth, storage, and database as managed services |
| Jotai | 2.0+ | State management | Fine-grained state management for React applications | | GitHub Actions | Latest | CI/CD pipeline | Integrated with GitHub, reliable deployment automation |
### Supporting Libraries ### Supporting Libraries
| Library | Version | Purpose | When to Use | | Library | Version | Purpose | When to Use |
|---------|---------|---------|-------------| |---------|---------|---------|-------------|
| date-fns | 3.6+ | Date manipulation | For date formatting and calculations | | Zustand | 4.x | State management | For global state like user preferences and task data |
| React Hook Form | 7.50+ | Form handling | For robust form validation and management | | React Query | 5.x | Data fetching | For server state management and API data synchronization |
| React DnD | 16.0+ | Drag and drop | For intuitive task reordering | | Tailwind CSS | 3.x | Styling framework | Rapid UI development with utility-first approach |
| clsx | 2.1+ | Conditional class names | For cleaner conditional styling | | date-fns | 2.x | Date manipulation | Lightweight, functional date utilities |
| zod | 3.22+ | Schema validation | For runtime validation of data structures | | react-beautiful-dnd | 14.x | Drag-and-drop | Excellent for implementing drag-and-drop functionality |
## Alternatives Considered ## Alternatives Considered
| Category | Recommended | Alternative | Why Not | | Category | Recommended | Alternative | Why Not |
|----------|-------------|-------------|---------| |----------|-------------|-------------|---------|
| Frontend Framework | React + Next.js | Vue.js | React ecosystem is more mature for this use case | | Frontend Framework | React | Vue.js | While Vue is great, React has stronger ecosystem and community support for this type of application |
| State Management | Jotai | Redux | Jotai offers better performance for simpler state needs | | Database | PostgreSQL | MongoDB | MongoDB is document-based and less suitable for structured relational data like task relationships |
| Database | localStorage/IndexedDB | Firebase | More complexity for simple local-first approach | | Backend Framework | Express.js | NestJS | NestJS adds overhead for this application's simpler requirements |
| Styling | Tailwind CSS | Styled Components | Tailwind offers faster prototyping and consistency | | State Management | Zustand | Redux | Redux has more boilerplate and complexity for a single-user task manager |
## Installation ## Installation
```bash ```bash
# Core # Core
npm install react react-dom next typescript @types/react @types/node npm install react react-dom react-router-dom
npm install @tanstack/react-query zustand
# Backend
npm install express cors helmet morgan
# Database
npm install prisma @prisma/client
npx prisma init
# Styling # Styling
npm install tailwindcss postcss autoprefixer npm install tailwindcss postcss autoprefixer
npx tailwindcss init -p npx tailwindcss init -p
# State Management # Date handling
npm install jotai npm install date-fns
# Data Handling # Drag and drop
npm install date-fns react-hook-form tanstack-react-query npm install react-beautiful-dnd
# Optional: For drag and drop
npm install @hello-pangea/dnd
# For validation
npm install zod
``` ```
## Sources ## Sources
- Modern React development patterns (2025) - Current web development trends and best practices (2025)
- Next.js 16+ best practices - Popular task management application technologies
- Community adoption statistics for frontend tools - Developer survey results on preferred frameworks and tools
- Technical documentation for recommended libraries

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## Executive Summary ## Executive Summary
This project involves building a weekly scheduler with calendar integration, designed as a modern, responsive web application for individual task management. Based on expert recommendations, the solution leverages React with Next.js as the core frontend framework, paired with TypeScript for type safety and Jotai for efficient state management. The architecture follows component-based patterns with clear separation of concerns, emphasizing local-first storage while supporting optional backend integration. Key pitfalls in this domain include inconsistent date/time handling, poor conflict resolution, inadequate offline support, and fragile calendar integrations, all of which require careful attention during implementation. This is a weekly task management application designed to help users organize their weekly schedules with a focus on task and calendar integration. Experts build this type of application using a layered architecture that separates frontend, backend, and data layers. The recommended stack includes React for the frontend with Zustand for state management, Node.js/Express for the backend, and PostgreSQL with Prisma for data persistence. A key architectural decision is to separate calendar integration into its own service layer to handle the complexities of syncing with multiple providers like Google and Apple calendars.
The core value proposition centers around the ability to display both tasks and calendar events in a unified weekly view, which reduces the need to switch between different applications. Key features include a weekly view display, task creation/editing/deletion, day navigation, and intuitive drag-and-drop functionality for reorganizing tasks between days.
Critical risks and pitfalls include inconsistent calendar synchronization behavior across providers, poor drag-and-drop performance that affects user experience, and data loss due to reliance on client-side storage alone. These pitfalls can significantly impact adoption and user satisfaction if not properly addressed through careful design and implementation practices.
## Key Findings ## Key Findings
### Stack Recommendations ### Stack
- **Frontend**: React 18.3+ with Next.js 16+ for SSR and modern features; TypeScript 5.4+ for safety - **React 18.x**: Component-based architecture with strong ecosystem for UI-heavy applications
- **Styling**: Tailwind CSS 3.4+ for rapid UI development - **Node.js 18.x**: Mature ecosystem and good performance for backend services
- **State Management**: Jotai 2.0+ for fine-grained state handling - **Express.js 4.x**: Lightweight and flexible API development framework
- **Data Handling**: TanStack Query 5.0+ for server state, date-fns 3.6+ for date manipulation - **PostgreSQL 14+**: ACID compliance and strong data integrity for structured task data
- **Database**: localStorage/IndexedDB for client-side persistence with optional PostgreSQL 15+ for backend - **Prisma 5.x**: Type-safe database access and migration management
- **Vercel**: Seamless deployment and CI/CD for React applications
- **Supabase**: Managed backend services for authentication, storage, and database
- **Zustand 4.x**: Lightweight state management for global application state
- **React Query 5.x**: Efficient server state management and API data synchronization
### Feature Landscape ### Features
- **Table Stakes**: Weekly view display, task creation/editing/deletion, day navigation, responsive design, local storage persistence, drag-and-drop reordering, date/time selection - **Table Stakes**: Weekly view display, task creation/editing/deletion, day navigation, drag-and-drop between days
- **Differentiators**: Calendar integration, theme customization, recurring tasks, task categories/tags, reminders, export/import - **Differentiators**: Calendar integration, combined task/event view, smart scheduling suggestions, theme customization, recurring tasks, priority levels
- **Anti-Features**: Complex permissions, email notifications, multi-user collaboration, advanced reporting (defer to later phases) - **Anti-Features**: Multi-user collaboration, complex filtering/searching, reporting analytics, email integration, desktop application
- **MVP Focus**: Prioritize core UI components and basic functionality before advanced features
### Architectural Patterns ### Architecture
- **Component Structure**: Weekly view, task list, creation form, navigation controls, data store, persistence layer, calendar sync service, week calculation service, validation layer - **Layered Architecture**: Distinct frontend, backend, data, and integration layers for scalability and maintainability
- **Data Flow**: User interaction → Component updates → Data processing → Storage operations → External sync → UI refresh - **Component Boundaries**: Clear separation of responsibilities between frontend, backend API, database, and calendar integration services
- **Patterns**: Component-based architecture, centralized state management, observer pattern for calendar sync - **Data Flow**: User interactions flow through frontend → backend API → database, with calendar integration as an additional service layer
- **Anti-patterns**: Monolithic components, direct DOM manipulation, inconsistent data flow - **Patterns**: Layered architecture, observer pattern for real-time updates, service layer for calendar integration
### Critical Pitfalls ### Pitfalls
1. **Inconsistent Date/Time Handling**: Time zones and DST transitions causing scheduling errors 1. **Inconsistent Calendar Sync**: Different behaviors between Google and Apple calendars leading to data discrepancies
2. **Poor Event Conflict Resolution**: Incorrect handling of overlapping tasks 2. **Poor Drag-and-Drop Performance**: Laggy or unresponsive operations affecting user experience
3. **Inadequate Offline Support**: Failure to function during connectivity issues 3. **Data Loss Risk**: Reliance on client-side storage without backup mechanisms
4. **Calendar Integration Fragility**: API instability causing sync failures 4. **UI Overcomplication**: Adding excessive features that overwhelm users
5. **Inadequate Error Handling**: Crashes or freezes from unexpected inputs or network issues
## Implications for Roadmap ## Implications for Roadmap
Suggested phases based on dependencies and architectural patterns: Based on the research findings, the recommended roadmap structure prioritizes foundational components that support core functionality while avoiding known pitfalls:
1. **Foundation & Core Features** — Establish essential functionality and data flow before introducing complexity ### Phase 1: Core Foundation
- Delivers: Basic weekly view, task CRUD, navigation, persistence, drag-and-drop **Rationale:** Establish essential UI components and basic API infrastructure before tackling complex integrations
- Features from FEATURES.md: Weekly view, task creation/edit/delete, navigation, persistence, drag-and-drop **Delivers:** Working weekly view, task CRUD operations, basic navigation, and drag-and-drop functionality
- Avoids pitfalls: Offline support, basic date handling **Features from FEATURES.md:** Weekly view display, task creation/editing/deletion, day navigation, drag-and-drop between days
**Pitfall Mitigation:** Avoid overcomplicating initial UI; focus on minimal viable product
2. **Advanced Features & UI Polish** — Add differentiators and enhance user experience ### Phase 2: Data Persistence & Management
- Delivers: Recurring tasks, categories, reminders, theme customization **Rationale:** Build the backend data services that will support the frontend and enable future features
- Features from FEATURES.md: Recurring tasks, categories, reminders, themes **Delivers:** Full CRUD operations backed by PostgreSQL database with Prisma ORM
- Avoids pitfalls: Complex UI, inefficient data storage **Features from FEATURES.md:** All table stakes features plus backend API infrastructure
**Pitfall Mitigation:** Implement proper error handling and database migration planning
3. **Calendar Integration** — Enable syncing with external calendar systems ### Phase 3: Calendar Integration
- Delivers: Google/Apple calendar integration **Rationale:** Integrate external calendar services as a distinct layer to enable combined views
- Features from FEATURES.md: Calendar integration **Delivers:** Google and Apple calendar synchronization with unified weekly view
- Avoids pitfalls: Integration fragility, improper error handling **Features from FEATURES.md:** Calendar integration (Google/Apple), combined task/event view
**Pitfall Mitigation:** Implement unified calendar abstraction to prevent inconsistent behavior
4. **Export & Advanced Functionality** — Provide data portability and advanced scheduling ### Phase 4: Advanced Features
- Delivers: Import/export, advanced filtering **Rationale:** Enhance user experience with differentiators that add value beyond basic task management
- Features from FEATURES.md: Export/import, advanced categorization **Delivers:** Theme customization, recurring tasks, priority levels, smart scheduling suggestions
- Avoids pitfalls: Inadequate recurrence logic, inefficient data flow **Features from FEATURES.md:** Theme customization, recurring tasks, priority levels, smart scheduling suggestions
**Pitfall Mitigation:** Maintain focus on user experience and avoid feature bloat
Research Flags: ## Research Flags
- Needs research: Phase 3 (Calendar Integration)
- Standard patterns: Phase 1 (Foundation), Phase 2 (Advanced Features), Phase 4 (Export/Advanced) **Needs research:** Phase 3 (Calendar Integration) - Requires deep dive into OAuth implementations and calendar API specifics
**Needs research:** Phase 4 (Advanced Features) - Needs validation of smart scheduling algorithms and theme customization options
**Standard patterns:** Phase 1 (Core Foundation) - Well-established patterns for React frontend and basic API development
**Standard patterns:** Phase 2 (Data Persistence) - Standard database and ORM setup with PostgreSQL/Prisma
## Confidence Assessment ## Confidence Assessment
| Area | Confidence | Notes | | Area | Confidence | Notes |
|------|------------|-------| |------|------------|-------|
| Stack | HIGH | Well-documented with clear rationale and versioning | | Stack | HIGH | Clear technology recommendations with strong ecosystem support |
| Features | HIGH | Comprehensive feature mapping with clear prioritization | | Features | HIGH | Comprehensive feature analysis with clear MVP prioritization |
| Architecture | HIGH | Detailed component breakdown with clear communication patterns | | Architecture | HIGH | Well-defined layered architecture with established patterns |
| Pitfalls | MEDIUM | Good coverage of critical and moderate risks but limited depth on minor issues | | Pitfalls | HIGH | Thorough identification of critical and moderate risks |
Gaps to Address: **Gaps:**
- Specific testing strategies for date/time handling - Detailed calendar API integration specifics
- Detailed calendar API integration patterns - Smart scheduling algorithm requirements
- Performance benchmarks for large datasets - Theme customization design system details
- Accessibility requirements for keyboard navigation
## Sources ## Sources
- Modern React development patterns (2025) - Current web development trends and best practices (2025)
- Next.js 16+ best practices - Popular task management application technologies
- Community adoption statistics for frontend tools - Developer survey results on preferred frameworks and tools
- Competitor analysis: TeuxDeux, Tweek.so, Google Tasks - Industry analysis of popular task management applications
- User experience research (2025) - User research on calendar integration needs
- React-based calendar application architecture patterns - Feature comparison studies of productivity tools
- Modern web application design principles - General software architecture principles from Martin Fowler's writings
- Calendar integration best practices (Google Calendar API, Apple Calendar API) - Layered architecture patterns commonly used in web applications
- Community insights from calendar app design forums and UX communities - Task management application design patterns from industry best practices
- Industry analysis of popular calendar applications (Google Calendar, Apple Calendar, Outlook) - Post-mortems from popular task management applications
- Common issues reported in developer forums and Stack Overflow - Issue discussions in open-source task management projects
- Academic research on temporal data handling in distributed systems - Community feedback on productivity tools
- Post-mortems from calendar application failures - UX research on calendar integration challenges
- Developer forums discussing web application performance bottlenecks