⚙️ Implementation: How to implement dual-layer layout persistence for unified-b...

📋 Decision Context

Question:

How to implement dual-layer layout persistence for unified-builder?

Task: Session 38: Implement dual-layer layout persistence for unified-builder

🎯 Decision Made

Chosen:

autoFlashState with global preferences and per-universe overrides

Options Considered:

1. Single flat persistence
2. Per-universe only persistence
3. Global + per-universe dual-layer persistence
4. External storage service

💭 Reasoning

Used autoFlashState pattern consistent with existing state management. Created two layers: (1) _globalLayoutPreferences for user's default layout settings with 90-day TTL, (2) _universeOverrides keyed by universeId for universe-specific customizations with 60-day TTL. Added effectiveLayoutPreferences computed signal that merges global with overrides. This approach allows users to have a default layout across all universes while customizing specific universes differently.

📁 Files Involved

• libs/libs-space/unified-builder/src/lib/services/unified-builder-state.service.ts

🔗 Related

• Decision ID: dev_1768074665996_zrmkz29
• Session: 35
• Workspace: editor2

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