backend/config.py

from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    # Modal inference (all models run on Modal GPU — nothing loaded locally)
    MODAL_APP_NAME: str = "finsight-ai"

    # FAISS vector store (local, persisted to disk)
    FAISS_DATA_DIR: str = "./data/faiss"

    # RAG settings
    TOP_K: int = 6
    CHUNK_SIZE: int = 512
    CHUNK_OVERLAP: int = 64
    HYBRID_ALPHA: float = 0.6

    # Ingestion — keep large PDF uploads fast (Modal chart OCR is slow per page)
    CHART_OCR_MAX_PAGES: int = 3
    CHART_OCR_MAX_TEXT_CHARS: int = 1200
    EMBED_BATCH_SIZE: int = 32

    # SQLite chat sessions
    CHAT_DB_PATH: str = "./data/chat_sessions.db"


settings = Settings()