Fix duplicate default model insertion

- Modified init_db to check for existing default model before inserting
- Prevents multiple insertions of the same model

vidai/database.py

@@ -561,11 +561,9 @@ def init_db(conn) -> None:
 
     # Insert default model if not exist
     default_model_name = 'Qwen/Qwen2.5-VL-7B-Instruct'
-    if config['type'] == 'mysql':
-        cursor.execute('INSERT IGNORE INTO models (name, type, path, vram_estimate) VALUES (?, ?, ?, ?)',
-                       ('Qwen 2.5 VL 7B Instruct', 'huggingface', default_model_name, 16))
-    else:
-        cursor.execute('INSERT OR IGNORE INTO models (name, type, path, vram_estimate) VALUES (?, ?, ?, ?)',
+    cursor.execute('SELECT id FROM models WHERE path = ?', (default_model_name,))
+    if not cursor.fetchone():
+        cursor.execute('INSERT INTO models (name, type, path, vram_estimate) VALUES (?, ?, ?, ?)',
                        ('Qwen 2.5 VL 7B Instruct', 'huggingface', default_model_name, 16))
 
     # Add data column to sessions table if it doesn't exist