Problem:
- Download counts were not incrementing when packages existed in storage
but not in the database (e.g., after database migration/reset)
- UpdateDownloadCount() was failing silently when package didn't exist in DB
- Error was completely ignored despite comment claiming "error logged"
Changes:
1. Log errors when UpdateDownloadCount() fails instead of silently ignoring
2. Auto-save package to database if UpdateDownloadCount() fails
3. Retry download count update after saving package
4. Provide detailed error logging for troubleshooting
This fixes the issue where:
- Database is migrated but storage still has cached packages
- Cache hits occur but download events aren't recorded
- Statistics show zero downloads despite actual usage
Resolves user report: "I cleaned go mod which redownloaded the modules
through the proxy but counters did not increased"
- [x] Implement GORM V2 metadata store with SQLite, PostgreSQL, and MySQL support
- [x] Add database migration system using gormigrate for schema versioning
- [x] Create migration CLI tool with support for migrate, rollback, and status commands
- [x] Add Docker support for migration container (Dockerfile.migrate)
- [x] Implement automatic partition management for PostgreSQL time-series tables
- [x] Add background aggregation worker for download statistics
- [x] Support connection pooling configuration (max_open_conns, max_idle_conns, conn_max_lifetime)
- [x] Add blocking mechanism based on vulnerability thresholds in stats and handlers
- [x] Update Helm charts with migration init containers and multi-database configuration
- [x] Replace deprecated SQLite store with optimized GORM implementation
- [x] Add comprehensive integration tests for MySQL and PostgreSQL
- [x] Update frontend to display blocked packages and storage utilization
- [x] Add goreleaser configuration for migrate binary and container image
- [x] Update configuration examples with database backend options and recommendations