Update metadata structure

utils/models.py

@@ -0,0 +1,36 @@
+from dataclasses import dataclass, asdict
+from typing import Dict, Optional
+from datetime import datetime
+
+@dataclass
+class LoraMetadata:
+    """Represents the metadata structure for a Lora model"""
+    file_name: str              # The filename without extension of the lora
+    model_name: str             # The lora's name defined by the creator, initially same as file_name
+    file_path: str              # Full path to the safetensors file
+    size: int                   # File size in bytes
+    modified: float             # Last modified timestamp
+    sha256: str                 # SHA256 hash of the file
+    base_model: str             # Base model (SD1.5/SD2.1/SDXL/etc.)
+    preview_url: str            # Preview image URL
+    civitai: Optional[Dict] = None  # Civitai API data if available
+
+    @classmethod
+    def from_dict(cls, data: Dict) -> 'LoraMetadata':
+        """Create LoraMetadata instance from dictionary"""
+        # Create a copy of the data to avoid modifying the input
+        data_copy = data.copy()
+        return cls(**data_copy)
+
+    def to_dict(self) -> Dict:
+        """Convert to dictionary for JSON serialization"""
+        return asdict(self)
+
+    @property
+    def modified_datetime(self) -> datetime:
+        """Convert modified timestamp to datetime object"""
+        return datetime.fromtimestamp(self.modified)
+
+    def update_civitai_info(self, civitai_data: Dict) -> None:
+        """Update Civitai information"""
+        self.civitai = civitai_data