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symfonic.memory.backends.procedural_seal

procedural_seal

Preserve committed procedure review evidence across generic node updates.

guard_update 

guard_update(node: Any, updates: dict[str, Any]) -> None

Validate the effective update while the backend holds its writer lock.

Source code in src/symfonic/memory/backends/procedural_seal.py 
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def guard_update(node: Any, updates: dict[str, Any]) -> None:
    """Validate the effective update while the backend holds its writer lock."""
    if node.layer != MemoryLayer.PROCEDURAL or not procedure_is_sealed_terminal(
        node.properties
    ):
        return
    if updates.get("layer", node.layer) != node.layer:
        raise NodeWriteConflict("reviewed procedure layer is immutable")
    proposed = dict(node.properties)
    for key, value in updates.items():
        if key == "scope_path":
            continue
        if key == "properties":
            if not isinstance(value, dict):
                raise NodeWriteConflict("reviewed procedure requires property object")
            proposed = dict(value)
        elif not hasattr(node, key):
            proposed[key] = value
    if _seal(node.properties) != _seal(proposed):
        raise NodeWriteConflict("generic update conflicts with committed procedure review")