from __future__ import annotations

from datetime import datetime

from sqlalchemy import DateTime, Text, func
from sqlalchemy.orm import Mapped, mapped_column

from . import Base


class Setting(Base):
    """A single persisted key/value setting. Values are JSON-encoded text; the
    typed defaults + metadata live in the code registry (thoughtsync.settings), so
    an empty table means "all defaults" (rule 26)."""

    __tablename__ = "settings"

    key: Mapped[str] = mapped_column(Text(), primary_key=True)
    value: Mapped[str] = mapped_column(Text(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
    )