Add unique constraint on models path and cleanup duplicates

- Added UNIQUE constraint on path column in models table
- Added cleanup query to remove duplicate models, keeping only one per path

vidai/database.py

@@ -540,7 +540,7 @@ def init_db(conn) -> None:
                 id INT AUTO_INCREMENT PRIMARY KEY,
                 name VARCHAR(255) NOT NULL,
                 type VARCHAR(50) NOT NULL,
-                path TEXT NOT NULL,
+                path TEXT NOT NULL UNIQUE,
                 vram_estimate INT DEFAULT 0,
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                 updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
@@ -552,13 +552,30 @@ def init_db(conn) -> None:
                 id INTEGER PRIMARY KEY,
                 name TEXT NOT NULL,
                 type TEXT NOT NULL,
-                path TEXT NOT NULL,
+                path TEXT NOT NULL UNIQUE,
                 vram_estimate INTEGER DEFAULT 0,
                 created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                 updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
             )
         ''')
 
+    # Clean up duplicate models (keep only the first one for each path)
+    if config['type'] == 'mysql':
+        cursor.execute('''
+            DELETE t1 FROM models t1
+            INNER JOIN models t2
+            WHERE t1.id > t2.id AND t1.path = t2.path
+        ''')
+    else:
+        cursor.execute('''
+            DELETE FROM models
+            WHERE id NOT IN (
+                SELECT MIN(id)
+                FROM models
+                GROUP BY path
+            )
+        ''')
+
     # Insert default model if not exist
     default_model_name = 'Qwen/Qwen2.5-VL-7B-Instruct'
     cursor.execute('SELECT id FROM models WHERE path = ?', (default_model_name,))