Fix config file parsing and improve backup/restore functionality

- Fix external_server.conf parsing to skip comment lines and empty lines
- Update routes.py get_db_connection() to handle comments
- Update settings.py get_external_db_connection() to handle comments
- Improve restore_backup() to use mariadb command instead of Python parsing
- Remove SQLite database creation (MariaDB only)
- Add environment detection for dump command (mariadb-dump vs mysqldump)
- Add conditional SSL flag based on Docker environment
- Fix database restore to handle MariaDB sandbox mode comments

py_app/app/database_backup.py

@@ -415,7 +415,7 @@ class DatabaseBackupManager:
     
     def restore_backup(self, filename):
         """
-        Restore database from a backup file
+        Restore database from a backup file using mariadb command
         
         Args:
             filename (str): Name of the backup file to restore
@@ -439,43 +439,51 @@ class DatabaseBackupManager:
                     'message': 'Backup file not found'
                 }
             
-            # Read SQL file and execute using Python mariadb library
-            import mariadb
-            
+            # Use mariadb command to restore (more reliable than Python parsing)
+            # First, read the file and skip problematic first line if needed
             with open(file_path, 'r') as f:
                 sql_content = f.read()
             
-            # Connect to database
-            conn = mariadb.connect(
-                user=self.config['user'],
-                password=self.config['password'],
-                host=self.config['host'],
-                port=int(self.config['port']),
-                database=self.config['database']
+            # Remove problematic MariaDB sandbox mode comment from first line
+            lines = sql_content.split('\n')
+            if lines and lines[0].startswith('/*M!999999'):
+                sql_content = '\n'.join(lines[1:])
+            
+            # Build mariadb restore command
+            cmd = [
+                'mariadb',
+                f"--host={self.config['host']}",
+                f"--port={self.config['port']}",
+                f"--user={self.config['user']}",
+                f"--password={self.config['password']}",
+            ]
+            
+            # Add SSL args if needed (Docker environment)
+            cmd.extend(self._get_ssl_args())
+            
+            # Add database name
+            cmd.append(self.config['database'])
+            
+            # Execute restore with stdin
+            result = subprocess.run(
+                cmd,
+                input=sql_content,
+                capture_output=True,
+                text=True
             )
             
-            cursor = conn.cursor()
-            
-            # Split SQL into statements and execute
-            statements = sql_content.split(';')
-            executed = 0
-            
-            for statement in statements:
-                statement = statement.strip()
-                if statement:
-                    try:
-                        cursor.execute(statement)
-                        executed += 1
-                    except Exception as stmt_error:
-                        print(f"Warning executing statement: {stmt_error}")
-            
-            conn.commit()
-            conn.close()
-            
-            return {
-                'success': True,
-                'message': f'Database restored successfully from {filename} ({executed} statements executed)'
-            }
+            if result.returncode == 0:
+                return {
+                    'success': True,
+                    'message': f'Database restored successfully from {filename}'
+                }
+            else:
+                error_msg = result.stderr
+                print(f"Restore error: {error_msg}")
+                return {
+                    'success': False,
+                    'message': f'Restore failed: {error_msg}'
+                }
         
         except Exception as e:
             print(f"Exception during restore: {e}")