from sqlalchemy import Column, Integer, String, UniqueConstraint
from database import Base

class Counter(Base):
    __tablename__ = "counters"
    id = Column(Integer, primary_key=True, index=True)
    namespace = Column(String, index=True, nullable=False)
    application = Column(String, index=True, nullable=False)
    version = Column(String, index=True, nullable=False)
    value = Column(Integer, default=0, nullable=False)

    __table_args__ = (
        UniqueConstraint('namespace', 'application', 'version', name='_namespace_application_version_uc'),
    )