Doc/RUNTIME_FIXES_SUMMARY.md

# Runtime Fixes Summary

## Overview
This document summarizes the complete fixes applied to resolve runtime errors in the Legal Dashboard OCR application, specifically addressing:

1. **SQLite Database Path Issues** (`sqlite3.OperationalError: unable to open database file`)
2. **Hugging Face Transformers Cache Permissions** (`/.cache` not writable)

## 🔧 Complete Fixes Applied

### 1. SQLite Database Path Fix

**File Modified:** `app/services/database_service.py`

**Changes:**
- Updated default database path to `/app/data/legal_dashboard.db`
- Added directory creation with `os.makedirs(os.path.dirname(self.db_path), exist_ok=True)`
- Added `check_same_thread=False` parameter for better thread safety

**Code Changes:**
```python
def __init__(self, db_path: str = "/app/data/legal_dashboard.db"):
    self.db_path = db_path
    self.connection = None
    # Create directory if it doesn't exist
    os.makedirs(os.path.dirname(self.db_path), exist_ok=True)
    self._init_database()

def _init_database(self):
    """Initialize database and create tables"""
    try:
        self.connection = sqlite3.connect(self.db_path, check_same_thread=False)
        # ... rest of initialization
```

### 2. Hugging Face Cache Permissions Fix

**File Modified:** `app/main.py`

**Changes:**
- Added directory creation for both `/app/cache` and `/app/data`
- Set environment variable `TRANSFORMERS_CACHE` to `/app/cache`
- Ensured directories are created before any imports

**Code Changes:**
```python
# Create directories and set environment variables
os.makedirs("/app/cache", exist_ok=True)
os.makedirs("/app/data", exist_ok=True)
os.environ["TRANSFORMERS_CACHE"] = "/app/cache"
```

### 3. Dockerfile Complete Updates

**File Modified:** `Dockerfile`

**Changes:**
- Added directory creation for `/app/data` and `/app/cache`
- Set proper permissions (777) for both directories
- Added environment variables `TRANSFORMERS_CACHE` and `HF_HOME`
- Ensured directories are created before copying application files

**Code Changes:**
```dockerfile
# Create volume-safe directories with proper permissions
RUN mkdir -p /app/data /app/cache && chmod -R 777 /app/data /app/cache

# Set environment variables for Hugging Face cache
ENV TRANSFORMERS_CACHE=/app/cache
ENV HF_HOME=/app/cache
```

### 4. Docker Ignore Updates

**File Modified:** `.dockerignore`

**Changes:**
- Added cache directory exclusions to prevent permission issues
- Preserved data directory for database persistence
- Excluded old database files while allowing new structure

**Code Changes:**
```
# Cache directories (exclude to prevent permission issues)
cache/
/app/cache/
```

## 🎯 Expected Results

After applying these complete fixes, the application should:

1. **Database Operations:**
   - Successfully create and access SQLite database at `/app/data/legal_dashboard.db`
   - No more `sqlite3.OperationalError: unable to open database file` errors
   - Database persists across container restarts

2. **Hugging Face Models:**
   - Successfully download and cache models in `/app/cache`
   - No more cache permission errors
   - Models load correctly on first run
   - Environment variables properly set for HF cache

3. **Container Deployment:**
   - Builds successfully on Hugging Face Docker SDK
   - Runs without permission-related runtime errors
   - Maintains data persistence in volume-safe directories
   - FastAPI boots without SQLite errors

## 🧪 Validation

A comprehensive validation script has been created (`validate_fixes.py`) that tests:

- Database path creation and access
- Cache directory setup and permissions
- Dockerfile configuration with environment variables
- Main.py updates for directory creation
- Docker ignore settings

Run the validation script to verify all fixes are working:

```bash
cd legal_dashboard_ocr
python validate_fixes.py
```

## 📁 Directory Structure

After fixes, the container will have this structure:

```
/app/
├── data/           # Database storage (persistent)
│   └── legal_dashboard.db
├── cache/          # HF model cache (persistent)
│   └── transformers/
├── app/            # Application code
├── frontend/       # Frontend files
└── requirements.txt
```

## 🔒 Security Considerations

- Database and cache directories have 777 permissions for container compatibility
- In production, consider more restrictive permissions if security is a concern
- Database files are stored in persistent volumes
- Cache can be cleared without affecting application functionality

## 🚀 Deployment

The application is now ready for deployment on Hugging Face Spaces with:

1. **No database initialization errors**
2. **No cache permission errors**
3. **Persistent data storage**
4. **Proper model caching**
5. **Environment variables properly configured**
6. **FastAPI boots successfully on port 7860**

All runtime errors related to file permissions, database access, and Hugging Face cache should be completely resolved.

## ✅ Complete Fix Checklist

- [x] SQLite database path updated to `/app/data/legal_dashboard.db`
- [x] Database directory creation with proper permissions
- [x] Hugging Face cache directory set to `/app/cache`
- [x] Environment variables `TRANSFORMERS_CACHE` and `HF_HOME` configured
- [x] Dockerfile updated with directory creation and environment variables
- [x] Main.py updated with directory creation and environment setup
- [x] Docker ignore updated to exclude cache directories
- [x] Validation script created to test all fixes
- [x] Documentation updated with complete fix summary