{"files": {"main.py": "from core import run\nfrom policy import POLICY\ndef evaluate(payload):\n    return run(payload, POLICY)\n", "core.py": "from copy import deepcopy\nfrom helpers import merge_fields, normalize_id\n\ndef run(payload, policy):\n    events = payload.get('events', []) if isinstance(payload, dict) else []\n    trim_ids = bool(policy.get('trim_ids', False))\n    fold_case = bool(policy.get('fold_case', False))\n    empty_id = policy.get('empty_id', 'error')\n    version_floor = policy.get('version_floor')\n    duplicate_policy = policy.get('duplicate_policy', 'first')\n    deduped = {}\n    for original_index, event in enumerate(events):\n        normalized_id = normalize_id(event.get('id', ''), trim_ids, fold_case)\n        if normalized_id == '':\n            if empty_id == 'skip':\n                continue\n            raise ValueError('empty id')\n        version = event.get('version')\n        if version_floor is not None and version < version_floor:\n            continue\n        key = (normalized_id, version)\n        selected = {'id': normalized_id, 'version': version, 'deleted': bool(event.get('deleted', False)), 'fields': event.get('fields') or {}, 'original_index': original_index}\n        if key not in deduped or duplicate_policy == 'last':\n            deduped[key] = selected\n    processed = sorted(deduped.values(), key=lambda item: (item['version'], item['original_index']))\n    records = {}\n    tombstones = set()\n    first_processed = {}\n    audit = []\n    tombstone_wins = bool(policy.get('tombstone_wins', False))\n    audit_all = bool(policy.get('audit_all', False))\n    unknown_fields = policy.get('unknown_fields', 'keep')\n    allowed = {'name', 'tags', 'meta'}\n    for processed_index, event in enumerate(processed):\n        normalized_id = event['id']\n        if normalized_id not in first_processed:\n            first_processed[normalized_id] = processed_index\n        applied = False\n        if event['deleted']:\n            if normalized_id in records:\n                del records[normalized_id]\n                applied = True\n                if tombstone_wins:\n                    tombstones.add(normalized_id)\n            elif tombstone_wins and normalized_id not in tombstones:\n                tombstones.add(normalized_id)\n                applied = True\n            else:\n                applied = False\n        else:\n            if tombstone_wins and normalized_id in tombstones:\n                applied = False\n            else:\n                if normalized_id not in records:\n                    records[normalized_id] = {}\n                source = event['fields']\n                if unknown_fields == 'drop':\n                    source = {key: value for key, value in source.items() if key in allowed}\n                merge_fields(records[normalized_id], source, policy)\n                applied = True\n        if audit_all or applied:\n            status = 'applied' if applied else 'blocked'\n            audit.append(f\"{normalized_id}:{event['version']}:{status}\")\n    items = list(records.items())\n    if policy.get('order') == 'id':\n        items.sort(key=lambda item: item[0])\n    else:\n        items.sort(key=lambda item: (first_processed.get(item[0], 0), item[0]))\n    return {'records': [{'id': normalized_id, 'fields': deepcopy(fields)} for normalized_id, fields in items], 'audit': audit}\n", "policy.py": "POLICY = {\"audit_all\": false, \"duplicate_policy\": \"last\", \"empty_id\": \"error\", \"fold_case\": false, \"list_merge\": \"unique\", \"nested_merge\": false, \"null_mode\": \"delete\", \"order\": \"input\", \"tombstone_wins\": false, \"trim_ids\": false, \"unknown_fields\": \"drop\", \"version_floor\": 3}\n", "helpers.py": "from copy import deepcopy\n\ndef normalize_id(value, trim_ids=False, fold_case=False):\n    result = value.strip() if trim_ids else value\n    if fold_case:\n        result = ''.join(chr(ord(char) + 32) if 'A' <= char <= 'Z' else char for char in result)\n    return result\n\ndef json_equal(left, right):\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, dict) and isinstance(right, dict):\n        if set(left.keys()) != set(right.keys()):\n            return False\n        return 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    if isinstance(left, (dict, list)) or isinstance(right, (dict, list)):\n        return False\n    return left == right\n\ndef merge_fields(target, source, policy):\n    null_mode = policy.get('null_mode', 'delete')\n    nested_merge = bool(policy.get('nested_merge', False))\n    list_merge = policy.get('list_merge', 'replace')\n    for key, value in source.items():\n        if value is None:\n            if null_mode == 'delete':\n                target.pop(key, None)\n            continue\n        existing = target.get(key)\n        if nested_merge and isinstance(existing, dict) and isinstance(value, dict):\n            merge_fields(existing, value, policy)\n        elif isinstance(existing, list) and isinstance(value, list):\n            if list_merge == 'unique':\n                additions = [deepcopy(item) for item in value if not any(json_equal(item, old) for old in existing)]\n                target[key] = list(existing) + additions\n            else:\n                target[key] = deepcopy(value)\n        else:\n            target[key] = deepcopy(value)\n    return target\n"}}