Update tasks to reflect MySQL instead of PostgreSQL/PostGIS

- Change task 22 from PostgreSQL+PostGIS to MySQL with spatial support
- Update references to PostGIS spatial queries to MySQL spatial functions
- Remove materialized view reference (MySQL specific)
- Update test task to reference MySQL instead of PostGIS

.kiro/specs/beach-litter-mapping/tasks.md

@@ -173,7 +173,7 @@
 
 ## Backend API Development
 
-- [ ] 21. Set up backend project structure
+- [x] 21. Set up backend project structure
   - Initialize Node.js project with Express
   - Configure TypeScript for backend
   - Set up folder structure: routes, controllers, services, middleware, utils
@@ -181,12 +181,12 @@
   - Create environment configuration
   - _Requirements: All backend requirements_
 
-- [ ] 22. Configure database with Prisma and PostGIS
-  - Set up PostgreSQL with PostGIS extension
+- [ ] 22. Configure database with Prisma and MySQL spatial support
+  - Set up MySQL 8.0+ with spatial data support
   - Create Prisma schema with all models (User, Report, Event, etc.)
-  - Configure PostGIS geography types for location fields
+  - Configure MySQL POINT spatial types for location fields
   - Create database migrations
-  - Set up database indexes for performance
+  - Set up database indexes including spatial indexes for performance
   - _Requirements: 1.1, 2.1, 3.2, 4.1_
 
 - [ ] 23. Implement authentication system
@@ -203,7 +203,7 @@
   - Build GET /api/reports/:id for single report retrieval
   - Create PATCH /api/reports/:id for updates
   - Implement DELETE /api/reports/:id with authorization
-  - Add spatial queries using PostGIS for location-based filtering
+  - Add spatial queries using MySQL spatial functions for location-based filtering
   - _Requirements: 1.1-1.8, 2.1, 2.4_
 
 - [ ] 25. Implement file upload and EXIF processing
@@ -232,9 +232,9 @@
 
 - [ ] 28. Build hotspot calculation system
   - Create scheduled job with node-cron for hotspot calculations
-  - Implement PostGIS spatial queries to identify clusters
+  - Implement MySQL spatial queries to identify clusters
   - Calculate severity scores based on report count and frequency
-  - Store hotspot data in database or materialized view
+  - Store hotspot data in database
   - Create GET /api/analytics/hotspots endpoint
   - _Requirements: 3.2, 3.3, 3.4_
 
@@ -310,7 +310,7 @@
   - Create API endpoint tests with Supertest
   - Test authentication flows
   - Test file upload pipeline
-  - Test spatial queries with PostGIS
+  - Test spatial queries with MySQL
   - Test external API integration with mocks
   - _Requirements: All requirements_