{"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_into, normalize_id\n\nALLOWED_FIELDS = {\"name\", \"tags\", \"meta\"}\n\ndef run(payload, policy):\n    if isinstance(payload, dict):\n        events = payload.get(\"events\", [])\n    else:\n        events = payload\n    if events is None:\n        events = []\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\", \"skip\")\n    version_floor = policy.get(\"version_floor\", 0)\n    duplicate_policy = policy.get(\"duplicate_policy\", \"first\")\n    deduped = {}\n    for original_index, event in enumerate(events):\n        if not isinstance(event, dict):\n            continue\n        raw_id = event.get(\"id\", \"\")\n        if not isinstance(raw_id, str):\n            raw_id = str(raw_id)\n        normalized_id = normalize_id(raw_id, trim_ids, fold_case)\n        if normalized_id == \"\":\n            if empty_id == \"raise\":\n                raise ValueError(\"empty id\")\n            continue\n        version = event.get(\"version\", 0)\n        if version < version_floor:\n            continue\n        key = (normalized_id, version)\n        if key not in deduped:\n            deduped[key] = (normalized_id, version, original_index, event)\n        elif duplicate_policy == \"last\":\n            deduped[key] = (normalized_id, version, original_index, event)\n    processed = sorted(deduped.values(), key=lambda item: (item[1], item[2]))\n    records_map = {}\n    tombstones = set()\n    first_processed = {}\n    audit = []\n    audit_all = bool(policy.get(\"audit_all\", False))\n    tombstone_wins = bool(policy.get(\"tombstone_wins\", False))\n    unknown_fields = policy.get(\"unknown_fields\", \"keep\")\n    for processed_index, (normalized_id, version, original_index, event) in enumerate(processed):\n        if normalized_id not in first_processed:\n            first_processed[normalized_id] = processed_index\n        deleted = bool(event.get(\"deleted\", False))\n        applied = False\n        if deleted:\n            if normalized_id in records_map:\n                del records_map[normalized_id]\n                if tombstone_wins:\n                    tombstones.add(normalized_id)\n                applied = True\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                fields = event.get(\"fields\", {})\n                if not isinstance(fields, dict):\n                    fields = {}\n                if unknown_fields == \"drop\":\n                    fields = {k: v for k, v in fields.items() if k in ALLOWED_FIELDS}\n                if normalized_id not in records_map:\n                    records_map[normalized_id] = {}\n                merge_into(records_map[normalized_id], fields, policy)\n                applied = True\n        if audit_all or applied:\n            status = \"applied\" if applied else \"blocked\"\n            audit.append(f\"{normalized_id}:{version}:{status}\")\n    if policy.get(\"order\", \"id\") == \"id\":\n        ordered_ids = sorted(records_map.keys())\n    else:\n        ordered_ids = sorted(records_map.keys(), key=lambda rid: (first_processed.get(rid, 0), rid))\n    records = [{\"id\": rid, \"fields\": deepcopy(records_map[rid])} for rid in ordered_ids]\n    return {\"records\": records, \"audit\": audit}\n", "policy.py": "POLICY = {\"audit_all\": True, \"duplicate_policy\": \"first\", \"empty_id\": \"skip\", \"fold_case\": True, \"list_merge\": \"replace\", \"nested_merge\": True, \"null_mode\": \"ignore\", \"order\": \"id\", \"tombstone_wins\": True, \"trim_ids\": True, \"unknown_fields\": \"keep\", \"version_floor\": 2}\n", "helpers.py": "from copy import deepcopy\n\ndef ascii_fold(value):\n    result = []\n    for ch in value:\n        code = ord(ch)\n        if 65 <= code <= 90:\n            result.append(chr(code + 32))\n        else:\n            result.append(ch)\n    return \"\".join(result)\n\ndef normalize_id(value, trim_ids, fold_case):\n    normalized = value\n    if trim_ids:\n        normalized = normalized.strip()\n    if fold_case:\n        normalized = ascii_fold(normalized)\n    return normalized\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, (int, float)) and isinstance(right, (int, float)):\n        return left == right\n    if type(left) is not type(right):\n        return False\n    if isinstance(left, dict):\n        if set(left.keys()) != set(right.keys()):\n            return False\n        return all(json_equal(left[k], right[k]) for k in left)\n    if isinstance(left, list):\n        if len(left) != len(right):\n            return False\n        return all(json_equal(a, b) for a, b in zip(left, right))\n    return left == right\n\ndef merge_into(target, source, policy):\n    null_mode = policy.get(\"null_mode\", \"ignore\")\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(value, dict) and isinstance(existing, dict):\n            merge_into(existing, value, policy)\n        elif isinstance(value, list) and isinstance(existing, list):\n            if list_merge == \"unique\":\n                old_items = list(existing)\n                additions = [deepcopy(item) for item in value if not any(json_equal(item, old_item) for old_item in old_items)]\n                target[key] = deepcopy(old_items) + additions\n            else:\n                target[key] = deepcopy(value)\n        else:\n            target[key] = deepcopy(value)\n    return target\n"}}