refactor: drive monitor to use postgres instead of json

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+# Drive Monitor Refactor - Task Status
+
+## Summary
+Unify DriveMonitor file state tracking from JSON to PostgreSQL database table `drive_files`.
+
+## Status: COMPLETED
+
+---
+
+## Completed ✅
+
+### 1. Migration
+- Created `migrations/6.3.1-01-drive-files/up.sql` with table schema
+- Indexes: bot_id, file_type, indexed, fail_count
+- Migration data from kb_documents for backwards compatibility
+
+### 2. Schema  
+- Created `src/core/shared/schema/drive.rs` with:
+  - `DriveFile` (Queryable)
+  - `NewDriveFile` (Insertable)  
+  - `DriveFileUpdate` (AsChangeset)
+  - diesel table! macro
+
+### 3. Repository
+- Created `src/drive/drive_files.rs` with `DriveFileRepository`
+- Methods: get_file_state, upsert_file, mark_indexed, mark_failed, get_max_fail_count, get_files_to_index, delete_file, get_all_files_for_bot, get_files_by_type
+
+---
+
+## Working Environment
+
+```bash
+# Access production logs
+ssh administrator@63.141.255.9
+sudo incus exec system -- tail -f /opt/gbo/logs/err.log | grep -i "drive\|error"
+
+# Check CI logs  
+ssh administrator@63.141.255.9
+sudo incus exec alm-ci -- tail -f /opt/gbo/logs/*.log
+
+# Health endpoint
+https://system.pragmatismo.com.br/api/health
+```
+
+---
+
+## Testing Playbook
+
+1. **Rendering**
+   - Navigate: https://chat.pragmatismo.com.br/salesianos
+   - Send "oi", verify HTML response
+
+2. **Direct Tool Execution**
+   - Click "cartas" button
+   - Ask about cartas
+
+3. **KB Injection**
+   - Ask about cartas without clicking button
+   - Verify KB influences response
+
+4. **Parallel LLM**
+   - Start conversation in one window
+   - Verify start.bas doesn't lock other windows
+
+5. **Config Settings**
+   - Verify history-limit=3 in config.csv respected
+   - Toggle Table switch button
+   - Verify prompt injection
+
+---
+
+## Critical Rules
+
+- Never stop - YOLO loop
+- Push to ALM after each fix
+- Check health endpoint after deploy
+- Monitor err.log continuously
+- Work only in ~/src/gb
+- Push all submodules to ALM
+
+---
+
+## Database Access
+
+```bash
+# Get credentials from Vault
+ssh administrator@63.141.255.9 "sudo incus exec system -- curl -s --cacert /opt/gbo/conf/system/certificates/ca/ca.crt -H 'X-Vault-Token: <SECRET>' https://10.157.134.250:8200/v1/secret/data/gbo/tables 2>/dev/null"
+```
+
+---
+
+## Container Layout
+- `system` - BotServer (port 8080)
+- `tables` - PostgreSQL (port 5432)  
+- `vault` - Vault (port 8200)
+- `directory` - Zitadel (port 8080/9000)
+- `drive` - MinIO (port 9100)
+- `cache` - Valkey (port 6379)
+- `llm` - llama.cpp (port 8081)
+- `vector_db` - Qdrant (port 6333)
+- `alm-ci` - CI runner
+
+---
+
+## Current Status
+
+- DriveMonitor refatorado para usar database (JSON removido)
+- FileState struct removido
+- Métodos load/save_file_states removidos
+- Repository pattern implementado
+- Compilação verificada: OK
+
+---
+
+## Next Steps
+
+1. Push para ALM todos os submódulos
+2. Aguardar CI build
+3. Testar com Playwright
+4. Verificar health endpoint
+5. Monitorar err.log
+6. Reportar status e continuar YOLO