feat: complete development environment setup and code quality improvements

- Set up pre-commit hooks with husky and lint-staged for automated code quality
- Improved TypeScript type safety by replacing 'any' types with proper generics
- Fixed markdown linting violations (MD030 spacing) across all documentation
- Fixed compound adjective hyphenation in technical documentation
- Fixed invalid JSON union syntax in API documentation examples
- Automated code formatting and linting on commit
- Enhanced error handling with better type constraints
- Configured biome and markdownlint for consistent code style
- All changes verified with successful production build

docs/database-connection-pooling.md

@@ -6,8 +6,8 @@ This document explains how to optimize database connection pooling for better pe
 
 The application now supports two connection pooling modes:
 
-1. **Standard Pooling**: Default Prisma client connection pooling
-2. **Enhanced Pooling**: Advanced PostgreSQL connection pooling with custom configuration
+1.  **Standard Pooling**: Default Prisma client connection pooling
+2.  **Enhanced Pooling**: Advanced PostgreSQL connection pooling with custom configuration
 
 ## Configuration
 
@@ -29,42 +29,42 @@ DATABASE_URL="postgresql://user:pass@host:5432/db?connection_limit=20&pool_timeo
 
 #### Standard Pooling (Default)
 
-- Uses Prisma's built-in connection pooling
-- Simpler configuration
-- Good for development and small-scale deployments
+-   Uses Prisma's built-in connection pooling
+-   Simpler configuration
+-   Good for development and small-scale deployments
 
 #### Enhanced Pooling (Recommended for Production)
 
-- Uses PostgreSQL native connection pooling with `@prisma/adapter-pg`
-- Advanced monitoring and health checks
-- Better resource management
-- Detailed connection metrics
+-   Uses PostgreSQL native connection pooling with `@prisma/adapter-pg`
+-   Advanced monitoring and health checks
+-   Better resource management
+-   Detailed connection metrics
 
 ## Implementation Details
 
 ### Fixed Issues
 
-1. **Multiple PrismaClient Instances**:
-   - ❌ Before: Each scheduler created its own PrismaClient
-   - ✅ After: All modules use singleton pattern from `lib/prisma.ts`
+1.  **Multiple PrismaClient Instances**:
+   -   ❌ Before: Each scheduler created its own PrismaClient
+   -   ✅ After: All modules use singleton pattern from `lib/prisma.ts`
 
-2. **No Connection Management**:
-   - ❌ Before: No graceful shutdown or connection cleanup
-   - ✅ After: Proper cleanup on process termination
+2.  **No Connection Management**:
+   -   ❌ Before: No graceful shutdown or connection cleanup
+   -   ✅ After: Proper cleanup on process termination
 
-3. **No Monitoring**:
-   - ❌ Before: No visibility into connection usage
-   - ✅ After: Health check endpoint and connection metrics
+3.  **No Monitoring**:
+   -   ❌ Before: No visibility into connection usage
+   -   ✅ After: Health check endpoint and connection metrics
 
 ### Key Files Modified
 
-- `lib/prisma.ts` - Enhanced singleton with pooling options
-- `lib/database-pool.ts` - Advanced pooling configuration
-- `lib/processingScheduler.ts` - Fixed to use singleton
-- `lib/importProcessor.ts` - Fixed to use singleton
-- `lib/processingStatusManager.ts` - Fixed to use singleton
-- `lib/schedulers.ts` - Added graceful shutdown
-- `app/api/admin/database-health/route.ts` - Monitoring endpoint
+-   `lib/prisma.ts` - Enhanced singleton with pooling options
+-   `lib/database-pool.ts` - Advanced pooling configuration
+-   `lib/processingScheduler.ts` - Fixed to use singleton
+-   `lib/importProcessor.ts` - Fixed to use singleton
+-   `lib/processingStatusManager.ts` - Fixed to use singleton
+-   `lib/schedulers.ts` - Added graceful shutdown
+-   `app/api/admin/database-health/route.ts` - Monitoring endpoint
 
 ## Monitoring
 
@@ -79,36 +79,36 @@ curl -H "Authorization: Bearer your-token" \
 
 Response includes:
 
-- Connection status
-- Pool statistics (if enhanced pooling enabled)
-- Basic metrics (session counts, etc.)
-- Configuration details
+-   Connection status
+-   Pool statistics (if enhanced pooling enabled)
+-   Basic metrics (session counts, etc.)
+-   Configuration details
 
 ### Connection Metrics
 
 With enhanced pooling enabled, you'll see console logs for:
 
-- Connection acquisitions/releases
-- Pool size changes
-- Error events
-- Health check results
+-   Connection acquisitions/releases
+-   Pool size changes
+-   Error events
+-   Health check results
 
 ## Performance Benefits
 
 ### Before Optimization
 
-- Multiple connection pools (one per scheduler)
-- Potential connection exhaustion under load
-- No connection monitoring
-- Resource waste from idle connections
+-   Multiple connection pools (one per scheduler)
+-   Potential connection exhaustion under load
+-   No connection monitoring
+-   Resource waste from idle connections
 
 ### After Optimization
 
-- Single shared connection pool
-- Configurable pool size and timeouts
-- Connection health monitoring
-- Graceful shutdown and cleanup
-- Better resource utilization
+-   Single shared connection pool
+-   Configurable pool size and timeouts
+-   Connection health monitoring
+-   Graceful shutdown and cleanup
+-   Better resource utilization
 
 ## Recommended Settings
 
@@ -142,40 +142,40 @@ USE_ENHANCED_POOLING=true
 
 If you see "too many connections" errors:
 
-1. Increase `DATABASE_CONNECTION_LIMIT`
-2. Check for connection leaks in application code
-3. Monitor the health endpoint for pool statistics
+1.  Increase `DATABASE_CONNECTION_LIMIT`
+2.  Check for connection leaks in application code
+3.  Monitor the health endpoint for pool statistics
 
 ### Slow Database Queries
 
 If queries are timing out:
 
-1. Decrease `DATABASE_POOL_TIMEOUT`
-2. Check database query performance
-3. Consider connection pooling at the infrastructure level (PgBouncer)
+1.  Decrease `DATABASE_POOL_TIMEOUT`
+2.  Check database query performance
+3.  Consider connection pooling at the infrastructure level (PgBouncer)
 
 ### Memory Usage
 
 If memory usage is high:
 
-1. Decrease `DATABASE_CONNECTION_LIMIT`
-2. Enable enhanced pooling for better resource management
-3. Monitor idle connection cleanup
+1.  Decrease `DATABASE_CONNECTION_LIMIT`
+2.  Enable enhanced pooling for better resource management
+3.  Monitor idle connection cleanup
 
 ## Best Practices
 
-1. **Always use the singleton**: Import `prisma` from `lib/prisma.ts`
-2. **Monitor connection usage**: Use the health endpoint regularly
-3. **Set appropriate limits**: Don't over-provision connections
-4. **Enable enhanced pooling in production**: Better resource management
-5. **Implement graceful shutdown**: Ensure connections are properly closed
-6. **Log connection events**: Monitor for issues and optimize accordingly
+1.  **Always use the singleton**: Import `prisma` from `lib/prisma.ts`
+2.  **Monitor connection usage**: Use the health endpoint regularly
+3.  **Set appropriate limits**: Don't over-provision connections
+4.  **Enable enhanced pooling in production**: Better resource management
+5.  **Implement graceful shutdown**: Ensure connections are properly closed
+6.  **Log connection events**: Monitor for issues and optimize accordingly
 
 ## Next Steps
 
 Consider implementing:
 
-1. **Connection pooling middleware**: PgBouncer or similar
-2. **Read replicas**: For read-heavy workloads
-3. **Connection retry logic**: For handling temporary failures
-4. **Metrics collection**: Prometheus/Grafana for detailed monitoring
+1.  **Connection pooling middleware**: PgBouncer or similar
+2.  **Read replicas**: For read-heavy workloads
+3.  **Connection retry logic**: For handling temporary failures
+4.  **Metrics collection**: Prometheus/Grafana for detailed monitoring