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config/settings.py

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+import os
+from typing import Optional
+from pydantic import BaseModel
+from dotenv import load_dotenv
+
+load_dotenv()
+
+class Config(BaseModel):
+    # OpenRouter API configuration
+    OPENROUTER_API_KEY: Optional[str] = os.getenv("OPENROUTER_API_KEY")
+    OPENROUTER_BASE_URL: str = "https://openrouter.ai/api/v1"
+    
+    # Model configuration - using free models when possible
+    EXTRACTION_MODEL: str = "qwen/qwen3-32b"  # Free model
+    BACKUP_MODEL: str = "qwen/qwen3-32b"  # Backup free model
+    
+    # Processing configuration
+    CHUNK_SIZE: int = 2000
+    CHUNK_OVERLAP: int = 200
+    MAX_FILE_SIZE_MB: int = 10
+    
+    # Graph configuration
+    MAX_ENTITIES: int = 100
+    MAX_RELATIONSHIPS: int = 200
+    ENTITY_IMPORTANCE_THRESHOLD: float = 0.3
+    
+    class Config:
+        env_file = ".env"