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Database Schema Implementation Summary

Branch Created

  • Branch Name: feature/database-schema
  • Purpose: Implementation of core database entities with proper relationships and constraints

Files Created

Core Entities

  1. src/entities/user.entity.ts - Enhanced User entity with comprehensive fields and relationships
  2. src/entities/product.entity.ts - Enhanced Product entity with inventory and categorization
  3. src/entities/order.entity.ts - Enhanced Order entity with financial tracking
  4. src/entities/transaction.entity.ts - Enhanced Transaction entity with payment processing
  5. src/entities/index.ts - Export barrel for all entities

Migration Files

  1. src/migrations/1706234567890-create-core-entities.ts - Forward migration creating all tables
  2. src/migrations/1706234567891-rollback-core-entities.ts - Rollback migration for safe reversals
  3. src/data-source.ts - TypeORM DataSource configuration

Documentation

  1. docs/database-schema.md - Comprehensive schema documentation with ER diagram
  2. docs/er-diagram.txt - Visual representation of entity relationships

Key Features Implemented

Database Normalization

✅ First Normal Form (1NF): All attributes contain atomic values
✅ Second Normal Form (2NF): All non-key attributes fully functionally dependent on primary key
✅ Third Normal Form (3NF): No transitive dependencies

Indexing Strategy

✅ Primary key indexes (UUID for global uniqueness)
✅ Foreign key indexes for join performance
✅ Frequently queried columns indexed
✅ Composite indexes for multi-column queries
✅ Spatial indexes for geolocation data
✅ Unique constraints where business rules require uniqueness

Timestamp Columns

✅ createdAt - Automatic timestamp on record creation
✅ updatedAt - Automatic timestamp on record updates
✅ deletedAt - Soft delete capability for data recovery

Foreign Key Relationships

✅ Users → Products: One-to-many (User sells many Products)
✅ Users → Orders: One-to-many (User buys/sells many Orders)
✅ Users → Transactions: One-to-many (User sends/receives many Transactions)
✅ Products → Categories: Many-to-one (Products belong to Categories)
✅ Orders → Transactions: One-to-many (Order paid with many Transactions)
✅ Users ↔ Products: Many-to-many (Favorites relationship)

Soft Delete Capability

✅ All major entities include deleted_at timestamp columns
✅ Data recovery capabilities
✅ Audit trail maintenance
✅ Historical data preservation
✅ Compliance requirements support

Entity Details

User Entity

  • Fields: 23 core fields including authentication, profile, and business data
  • Enums: UserRole (buyer, seller, admin, moderator), UserStatus (active, inactive, suspended, deleted)
  • Relationships: Listings, sent/received transactions, notifications, favorites
  • Security: Password hashing, refresh tokens, verification flags

Product Entity

  • Fields: 25 core fields including inventory, pricing, and categorization
  • Enums: ProductStatus (draft, active, inactive, sold_out, archived), ProductCondition (new, like_new, good, fair, poor)
  • Features: Inventory management, geospatial data, rating aggregation, expiration dates
  • Relationships: User (seller), Category, favorited users

Order Entity

  • Fields: 22 core fields including financial breakdown and tracking
  • Enums: OrderStatus (pending, confirmed, processing, shipped, delivered, completed, cancelled, refunded)
  • PaymentStatus: (unpaid, paid, partially_paid, refunded, failed)
  • Features: Tax/shipping calculations, item JSON storage, timeline tracking
  • Relationships: Buyer user, seller user

Transaction Entity

  • Fields: 23 core fields including payment processing details
  • Enums: TransactionStatus, TransactionType, PaymentMethod
  • Features: Fee tracking, blockchain integration, external references
  • Relationships: Sender user, receiver user, related order

Migration Features

Forward Migration

  • Creates all four core tables with proper constraints
  • Establishes all foreign key relationships
  • Implements comprehensive indexing strategy
  • Handles geospatial data types
  • Supports JSON/JSONB data storage

Rollback Capability

  • Safe constraint dropping before table removal
  • Dependency-aware table dropping order
  • Graceful error handling for missing objects
  • Preserves ability to reapply forward migration

Documentation Highlights

Technical Documentation

  • Detailed entity field descriptions
  • Relationship mapping with cardinality
  • Indexing strategy rationale
  • Constraint definitions
  • Soft delete implementation details

Visual Documentation

  • ASCII ER diagram showing all relationships
  • Table structure representations
  • Constraint visualization
  • Relationship cardinality indicators

Deployment Guidance

  • Migration execution process
  • Rollback procedures
  • Testing recommendations
  • Performance considerations

Compliance & Best Practices

✅ Database Normalization: Follows 1NF, 2NF, 3NF principles
✅ Indexing: Strategic indexing for query optimization
✅ Constraints: Proper foreign key and unique constraints
✅ Soft Delete: Comprehensive soft delete implementation
✅ Timestamps: Automatic creation/update timestamps
✅ Migration Safety: Rollback capability included
✅ Documentation: Comprehensive technical documentation

Next Steps

  1. Database Connection: Configure database credentials in .env file
  2. Migration Execution: Run npm run build followed by migration commands
  3. Testing: Verify entity relationships and constraints work correctly
  4. Integration: Connect entities to existing service layers
  5. Performance Testing: Validate query performance with indexes

Commands for Migration

# Build the project
npm run build

# Run the forward migration
npx typeorm migration:run -d dist/data-source.js

# Run the rollback migration (if needed)
npx typeorm migration:revert -d dist/data-source.js

This implementation provides a solid foundation for the MarketX marketplace platform with proper database design principles, comprehensive documentation, and safe deployment procedures.