database.py

from sqlalchemy import create_engine, Column, String, Integer, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import datetime
import json

SQLALCHEMY_DATABASE_URL = "sqlite:///./app_database.db"

engine = create_engine(
    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class User(Base):
    __tablename__ = "users"

    user_id = Column(String, primary_key=True, index=True)
    favorite_artists_json = Column(String, default="[]")
    favorite_genres_json = Column(String, default="[]")
    default_tags_json = Column(String, default="[]") # ["k-pop", "korean"]

    def set_preferences(self, artists, genres, tags):
        self.favorite_artists_json = json.dumps(artists)
        self.favorite_genres_json = json.dumps(genres)
        self.default_tags_json = json.dumps(tags)

class ListeningHistory(Base):
    __tablename__ = "history"

    id = Column(Integer, primary_key=True, index=True, autoincrement=True)
    user_id = Column(String, index=True)
    track_title = Column(String)
    track_artist = Column(String)
    track_url = Column(String)
    duration = Column(Integer, default=0)
    emotion_state = Column(String) # "Sadness"
    action = Column(String) # "liked", "completed", "skipped"
    timestamp = Column(DateTime, default=datetime.datetime.utcnow)

Base.metadata.create_all(bind=engine)

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()