FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

agents/founding-engineer/memory/2026-04-24.md

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+# 2026-04-24
+
+## Timeline
+
+### 17:09 - FRE-608 Turso Database Setup Complete
+
+**Summary:**
+- ✅ Installed dependencies: @libsql/client, drizzle-orm, drizzle-kit, @types/node
+- ✅ Created schema for 9 tables: users, projects, scripts, characters, scenes, revisions, character_relationships, scene_characters, revision_changes
+- ✅ Implemented DatabaseManager with singleton connection pooling
+- ✅ Implemented EdgeDatabaseManager for multi-region replica routing
+- ✅ Implemented DatabaseBackupManager with automated scheduling
+- ✅ Generated migrations (0000_complex_donald_blake.sql, 0001_tan_machine_man.sql)
+- ✅ Created seed script and documentation
+- ✅ Added NPM scripts (db:generate, db:push, db:migrate, db:seed)
+- ✅ Marked FRE-608 as in_review, assigned to Code Reviewer
+
+**Files Created:**
+- `src/db/schema/{users,projects,scripts,characters,scenes,revisions}.ts`
+- `src/db/config/{database,edge-database,migrations,backup}.ts`
+- `src/db/{index.ts,seed.ts,README.md}`
+- `src/db/migrations/0000_complex_donald_blake.sql`
+- `drizzle.config.ts`
+- `.env.example`
+
+**Next Actions:**
+- Awaiting code review on FRE-608
+- Ready to continue with FRE-600, FRE-606, FRE-609, or FRE-611