app/models/sync.py

from sqlalchemy import Column, String, DateTime, JSON, Boolean, Integer
from datetime import datetime
import uuid
from app.database import Base

class B2SyncQueue(Base):
    __tablename__ = "b2_sync_queue"

    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
    file_key = Column(String, nullable=False)
    file_url = Column(String, nullable=False)
    sync_type = Column(String, nullable=False) # "device" o "group"
    target_id = Column(String, nullable=False) # userId o groupId
    pending_recipients = Column(JSON, nullable=False) # lista de IDs de dispositivos o usuarios
    created_at = Column(DateTime, default=datetime.utcnow)
    
    is_uploaded = Column(Boolean, default=True)
    uploading_by = Column(String, nullable=True, default=None)
    uploading_claimed_at = Column(DateTime, nullable=True, default=None)
    missing_stems = Column(JSON, nullable=True, default=None) # JSON: {"recipient_id": ["vocals", "drums"]}

class MigrationBackup(Base):
    __tablename__ = "migration_backups"

    id = Column(String, primary_key=True, default=lambda: str(uuid.uuid4()))
    user_id = Column(Integer, nullable=False, index=True)
    created_at = Column(DateTime, default=datetime.utcnow)
    expires_at = Column(DateTime, nullable=False)
    status = Column(String, default="pending") # "pending", "completed", "restored", "expired"
    metadata_json = Column(JSON, nullable=True) # Mapa de metadatos locales
    files_info = Column(JSON, nullable=True, default=[]) # Lista de stems respaldados: [{"task_id": "...", "stem_name": "..."}]