persistence/predicate.py

Provides a backend‑neutral predicate tree for building query filters in a storage‑agnostic way.

# Source: https://github.com/EverMind-AI/EverOS | License: Apache-2.0 | Copyright You must retain, in the Source form of any Derivative Works
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"""Backend-neutral predicate tree for rebuildable derived indexes.

Application and memory code construct these nodes.  A storage adapter owns
the rendering into its physical query language, so backend syntax never leaks
above :mod:`everos.infra.persistence`.
"""

from __future__ import annotations

import datetime as dt
from dataclasses import dataclass
from typing import Literal

type Scalar = str | int | float | bool | dt.datetime
type ComparisonOperator = Literal["eq", "ne", "gt", "gte", "lt", "lte"]


class Predicate:
    """Marker base class for derived-index predicates."""


@data

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