Update backup system and settings UI

- Improved backup path handling for Docker environments
- Changed default backup type to data-only for scheduled backups
- Updated settings.html with enhanced backup management UI
- Replaced 'Drop Table' with 'Truncate Table' functionality
  - Clear data while preserving structure and triggers
  - Changed from danger zone styling (red) to caution styling (orange)
  - Added clear confirmation dialog with table name verification
- Added upload backup file functionality
- Improved backup schedule management with edit/toggle/delete
- Updated styling and dark mode support
- Removed old backup metadata files

py_app/app/database_backup.py

@@ -78,14 +78,21 @@ class DatabaseBackupManager:
             return None
     
     def _get_backup_path(self):
-        """Get backup path from environment or use default"""
-        # Check environment variable (set in docker-compose)
-        backup_path = os.environ.get('BACKUP_PATH', '/srv/quality_app/backups')
+        """Get backup path - use container path when in Docker"""
+        # When running in Docker container, use the mounted container path
+        # The volume is always mounted at /srv/quality_app/backups in the container
+        # regardless of the host path specified in BACKUP_PATH env var
+        if os.path.exists('/.dockerenv') or os.environ.get('DOCKER_CONTAINER'):
+            # Running in Docker - use container path
+            backup_path = '/srv/quality_app/backups'
+        else:
+            # Running on host - use environment variable or default
+            backup_path = os.environ.get('BACKUP_PATH', '/srv/quality_app/backups')
         
-        # Check if custom path is set in config
+        # Check if custom path is set in config (host deployments)
         try:
             settings_file = os.path.join(current_app.instance_path, 'external_server.conf')
-            if os.path.exists(settings_file):
+            if os.path.exists(settings_file) and not (os.path.exists('/.dockerenv') or os.environ.get('DOCKER_CONTAINER')):
                 with open(settings_file, 'r') as f:
                     for line in f:
                         if line.startswith('backup_path='):
@@ -672,7 +679,7 @@ class DatabaseBackupManager:
                 'enabled': False,
                 'time': '02:00',  # 2 AM
                 'frequency': 'daily',  # daily, weekly, monthly
-                'backup_type': 'full',  # full or data-only
+                'backup_type': 'data-only',  # full or data-only
                 'retention_days': 30  # Keep backups for 30 days
             }