{"files":{"main.py":"from core import run\nfrom policy import POLICY\n\n\ndef evaluate(payload):\n    return run(payload, POLICY)\n","core.py":"from helpers import merge_fields, normalize_id\n\n\ndef run(payload, policy):\n    events = payload['events'] if isinstance(payload, dict) else payload\n    selected = {}\n    for original_index, event in enumerate(events):\n        normalized_id = normalize_id(event['id'], policy)\n        if not normalized_id:\n            if policy['empty_id'] == 'error':\n                raise ValueError('Empty normalized id')\n            continue\n        version = event['version']\n        if version < policy['version_floor']:\n            continue\n        key = (normalized_id, version)\n        if key not in selected or policy['duplicate_policy'] == 'last':\n            selected[key] = (original_index, event)\n\n    ordered = sorted(selected.items(), key=lambda item: (item[0][1], item[1][0]))\n    records = {}\n    tombstones = set()\n    first_processed = {}\n    audit = []\n    for processed_index, ((normalized_id, version), (_, event)) in enumerate(ordered):\n        first_processed.setdefault(normalized_id, processed_index)\n        if event['deleted']:\n            existed = normalized_id in records\n            new_tombstone = policy['tombstone_wins'] and normalized_id not in tombstones\n            applied = existed or new_tombstone\n            records.pop(normalized_id, None)\n            if policy['tombstone_wins']:\n                tombstones.add(normalized_id)\n        elif policy['tombstone_wins'] and normalized_id in tombstones:\n            applied = False\n        else:\n            fields = event['fields']\n            if policy['unknown_fields'] == 'drop':\n                fields = {key: value for key, value in fields.items() if key in ('name', 'tags', 'meta')}\n            current = records.setdefault(normalized_id, {})\n            merge_fields(current, fields, policy)\n            applied = True\n        if policy['audit_all'] or applied:\n            status = 'applied' if applied else 'blocked'\n            audit.append(f'{normalized_id}:{version}:{status}')\n\n    if policy['order'] == 'id':\n        ids = sorted(records)\n    else:\n        ids = sorted(records, key=lambda normalized_id: (first_processed[normalized_id], normalized_id))\n    return {\n        'records': [{'id': normalized_id, 'fields': records[normalized_id]} for normalized_id in ids],\n        'audit': audit,\n    }\n","policy.py":"POLICY = {\n    'duplicate_policy': 'first',\n    'fold_case': True,\n    'trim_ids': True,\n    'tombstone_wins': True,\n    'null_mode': 'ignore',\n    'nested_merge': True,\n    'list_merge': 'replace',\n    'version_floor': 2,\n    'order': 'id',\n    'unknown_fields': 'keep',\n    'empty_id': 'skip',\n    'audit_all': True,\n}\n","helpers.py":"from copy import deepcopy\n\n\n_ASCII_FOLD = str.maketrans('ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')\n\n\ndef normalize_id(value, policy):\n    if policy['trim_ids']:\n        value = value.strip()\n    if policy['fold_case']:\n        value = value.translate(_ASCII_FOLD)\n    return value\n\n\ndef json_equal(left, right):\n    if left is None or right is None:\n        return left is None and right is None\n    if isinstance(left, bool) or isinstance(right, bool):\n        return isinstance(left, bool) and isinstance(right, bool) and left == right\n    if isinstance(left, (int, float)) and isinstance(right, (int, float)):\n        return left == right\n    if isinstance(left, dict) and isinstance(right, dict):\n        return left.keys() == right.keys() and all(json_equal(left[key], right[key]) for key in left)\n    if isinstance(left, list) and isinstance(right, list):\n        return len(left) == len(right) and all(json_equal(a, b) for a, b in zip(left, right))\n    return type(left) is type(right) and left == right\n\n\ndef merge_fields(target, incoming, policy):\n    for key, value in incoming.items():\n        if value is None:\n            if policy['null_mode'] == 'delete':\n                target.pop(key, None)\n            continue\n        old = target.get(key)\n        if policy['nested_merge'] and isinstance(old, dict) and isinstance(value, dict):\n            merge_fields(old, value, policy)\n        elif isinstance(old, list) and isinstance(value, list) and policy['list_merge'] == 'unique':\n            additions = [deepcopy(item) for item in value if not any(json_equal(item, existing) for existing in old)]\n            target[key] = old + additions\n        else:\n            target[key] = deepcopy(value)\n"}}