Adding model deletion feature from database

src/database/db_manager.py

@@ -201,6 +201,28 @@ class DatabaseManager:
         finally:
             conn.close()
 
+    def delete_model(self, model_id: int) -> bool:
+        """Delete a model from the database.
+
+        Note: detections referencing this model are deleted automatically via
+        the `detections.model_id` foreign key (ON DELETE CASCADE).
+
+        Args:
+            model_id: ID of the model to delete.
+
+        Returns:
+            True if a model row was deleted, False otherwise.
+        """
+
+        conn = self.get_connection()
+        try:
+            cursor = conn.cursor()
+            cursor.execute("DELETE FROM models WHERE id = ?", (model_id,))
+            conn.commit()
+            return cursor.rowcount > 0
+        finally:
+            conn.close()
+
     # ==================== Image Operations ====================
 
     def add_image(