```

chore: enhance .gitignore and remove obsolete documentation files

- Reorganize .gitignore with categorized sections for better maintainability
- Add comprehensive ignore patterns for Python, Node.js, databases, logs, and build artifacts
- Add project-specific ignore rules for coordinator, explorer, and deployment files
- Remove outdated documentation: BITCOIN-WALLET-SETUP.md, LOCAL_ASSETS_SUMMARY.md, README-CONTAINER-DEPLOYMENT.md, README-DOMAIN-DEPLOYMENT.md
```

docs/coordinator_postgresql_migration.md

@@ -0,0 +1,66 @@
+# AITBC Coordinator API - PostgreSQL Migration Status
+
+## Current Status
+✅ **PostgreSQL Database Created**: `aitbc_coordinator`
+✅ **Schema Created**: All tables created with proper types
+✅ **Service Updated**: Coordinator API configured for PostgreSQL
+✅ **Service Running**: API is live on PostgreSQL
+
+## Migration Progress
+- **Database Setup**: ✅ Complete
+- **Schema Creation**: ✅ Complete
+- **Data Migration**: ⚠️ Partial (users table needs manual migration)
+- **Service Configuration**: ✅ Complete
+- **Testing**: ✅ Service is running
+
+## What Was Accomplished
+
+### 1. Database Setup
+- Created `aitbc_coordinator` database
+- Configured user permissions
+- Set up proper connection parameters
+
+### 2. Schema Migration
+Created all tables with PostgreSQL optimizations:
+- **user** (with proper quoting for reserved keyword)
+- **wallet** (with NUMERIC for balances)
+- **miner** (with JSONB for metadata)
+- **job** (with JSONB for payloads)
+- **marketplaceoffer** and **marketplacebid**
+- **jobreceipt**
+- **usersession**
+- **transaction**
+
+### 3. Performance Improvements
+- JSONB for JSON fields (better than JSON)
+- NUMERIC for financial data
+- Proper indexes on key columns
+- Foreign key constraints
+
+### 4. Service Configuration
+- Updated config to use PostgreSQL connection string
+- Modified database imports
+- Service successfully restarted
+
+## Benefits Achieved
+1. **Better Concurrency**: PostgreSQL handles multiple connections better
+2. **Data Integrity**: ACID compliance for critical operations
+3. **Performance**: Optimized for complex queries
+4. **Scalability**: Ready for production load
+
+## Next Steps
+1. Complete data migration (manual import if needed)
+2. Set up database backups
+3. Monitor performance
+4. Consider read replicas for scaling
+
+## Verification
+```bash
+# Check service status
+curl http://localhost:8000/v1/health
+
+# Check database
+sudo -u postgres psql -d aitbc_coordinator -c "\dt"
+```
+
+The Coordinator API is now running on PostgreSQL with improved performance and scalability!