Model Correctness & Data Integrity

What Was Built

• LogCleanupJob now deletes LogEntry records before FetchLog/ScrapeLog batch deletions, preventing orphaned polymorphic records
• Source model gains HEALTH_STATUS_VALUES constant and inclusion validation; DB default aligned from "healthy" to "working" via migration
• Source gains scraping_enabled/scraping_disabled scopes
• Item gains restore! method as symmetric counterpart to soft_delete!, maintaining counter cache correctness
• sync_log_entry callback consolidated into Loggable concern, removing duplication from FetchLog, ScrapeLog, HealthCheckLog
• ItemContent uses delegation for feed content access instead of reaching through association
• ImportHistory gains JSONB attribute declarations with proper defaults and chronological validation

Files Modified

• app/jobs/source_monitor/log_cleanup_job.rb -- cascade LogEntry deletes before log record deletes
• app/models/source_monitor/source.rb -- HEALTH_STATUS_VALUES, inclusion validation, scraping scopes
• app/models/source_monitor/item.rb -- restore! method with counter cache increment
• app/models/concerns/source_monitor/loggable.rb -- consolidated sync_log_entry callback
• app/models/source_monitor/fetch_log.rb -- removed duplicate sync_log_entry
• app/models/source_monitor/scrape_log.rb -- removed duplicate sync_log_entry
• app/models/source_monitor/health_check_log.rb -- removed duplicate sync_log_entry
• app/models/source_monitor/item_content.rb -- delegate :content to :item with feed prefix
• app/models/source_monitor/import_history.rb -- JSONB attribute defaults, chronological validation
• db/migrate/20260314120000_align_health_status_default.rb -- change DB default to "working"
• test/jobs/source_monitor/log_cleanup_job_test.rb -- orphan prevention tests
• test/models/source_monitor/source_test.rb -- health_status validation and scraping scope tests
• test/models/source_monitor/item_test.rb -- restore! and counter cache symmetry tests
• test/models/source_monitor/fetch_log_test.rb -- sync_log_entry via Loggable test
• test/models/source_monitor/import_history_test.rb -- new: JSONB defaults, counts, chronological validation
• test/dummy/db/schema.rb -- updated by migration