Add Pinned field to Issue struct and database schema to protect issues from accidental deletion via cleanup or compaction. Changes: - Add Pinned bool field to types.Issue - Create migration 023_pinned_column.go for database schema - Filter out pinned issues in cleanup command before deletion - Add pinned check to GetTier1Candidates and GetTier2Candidates - Add pinned check to CheckEligibility for compaction - Update all SQL queries and scan functions to include pinned field 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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