Upgrades | Produce MVP

The goal of this ticket is the produce the MVP for the new upgrade architecture (skeleton) that core developers can begin implementing the health check & internal upgrade procedures into

Miro: https://miro.com/app/board/uXjVI-g_6Q8=/

Sprint 2025-6 goals:

• Start columnstore in special mode without allowing user queries temporarily to complete upgrade process (partially done)
• Hooks for upgrading syscat. (done but needs review/testing)
• downgrade syscat hooks. (done but needs review/testing)
• post upgrade/install health check hooks (in progress)
• Upgrade UI ? (in progress)
  Talk with drrtuy to define hooks/format and considerations

Sprint 2025-7 goals:
New/Continued Development

• continue special mode development between change versions (7d)
• post upgrade/install health check hooks (5d)
• change version file management (1d)
• Upgrade UI / terminal output (3d)
  Testing/Review
• Hooks for upgrading syscat
• downgrade syscat hooks

Sprint 2025-8 goals:
Health Check Development & Testing

• Health check (extent map checker) 5d (moved to MCOL 6153)
• Retest Debian/Ubuntu and other testing - 5d+ ( done everythings thats found so far - alan.mologorsky will comment what bugs/issue he fixed already - to track if regressions occur)
• * special mode upgrade/downgrade debian issues - some partially solved. Nothing to do until binary for downgrade/upgrade syscat directly from roman/leonid (MCOL-6154)
• Aleksei testing