{"files":{"main.py":"from core import run\nfrom policy import POLICY\ndef evaluate(payload):\n    return run(payload, POLICY)\n","policy.py":"POLICY = {\n    'duplicate_policy': 'last',\n    'fold_case': False,\n    'tombstone_wins': False,\n    'trim_ids': False,\n    'list_merge': 'unique',\n    'nested_merge': False,\n    'null_mode': 'delete',\n    'version_floor': 3,\n    'audit_all': False,\n    'empty_id': 'error',\n    'order': 'input',\n    'unknown_fields': 'drop',\n}\n","helpers.py":"import copy\n\n\ndef jeq(a, b):\n    if isinstance(a, bool) or isinstance(b, bool):\n        return isinstance(a, bool) and isinstance(b, bool) and a == b\n    if isinstance(a, dict):\n        if not isinstance(b, dict) or set(a) != set(b):\n            return False\n        return all(jeq(a[k], b[k]) for k in a)\n    if isinstance(a, list):\n        if not isinstance(b, list) or len(a) != len(b):\n            return False\n        return all(jeq(x, y) for x, y in zip(a, b))\n    if isinstance(b, (dict, list)) or isinstance(b, bool):\n        return False\n    return type(a) in (int, float) and type(b) in (int, float) and a == b or (a == b and type(a) == type(b))\n\n\ndef fold(s):\n    return ''.join(chr(ord(c) + 32) if 'A' <= c <= 'Z' else c for c in s)\n\n\ndef merge(old, new, policy):\n    res = old\n    for k, v in new.items():\n        if v is None:\n            if policy['null_mode'] == 'delete':\n                res.pop(k, None)\n            continue\n        cur = res.get(k)\n        if policy['nested_merge'] and isinstance(cur, dict) and isinstance(v, dict):\n            res[k] = merge(cur, v, policy)\n        elif policy['list_merge'] == 'unique' and isinstance(cur, list) and isinstance(v, list):\n            add = [copy.deepcopy(x) for x in v if not any(jeq(x, o) for o in cur)]\n            res[k] = cur + add\n        else:\n            res[k] = copy.deepcopy(v)\n    return res\n","core.py":"import copy\nfrom helpers import fold, merge\n\nKNOWN = ('name', 'tags', 'meta')\n\n\ndef run(payload, policy):\n    if isinstance(payload, dict):\n        events = payload.get('events', [])\n    else:\n        events = payload\n    groups = {}\n    order_keys = []\n    for idx, ev in enumerate(events):\n        nid = ev.get('id')\n        nid = '' if nid is None else str(nid)\n        if policy['trim_ids']:\n            nid = nid.strip()\n        if policy['fold_case']:\n            nid = fold(nid)\n        if nid == '':\n            if policy['empty_id'] == 'error':\n                raise ValueError('empty id')\n            continue\n        if ev['version'] < policy['version_floor']:\n            continue\n        key = (nid, ev['version'])\n        if key not in groups:\n            groups[key] = idx\n            order_keys.append(key)\n        elif policy['duplicate_policy'] == 'last':\n            groups[key] = idx\n    sel = [(k[1], groups[k], k[0]) for k in order_keys]\n    sel.sort(key=lambda t: (t[0], t[1]))\n    records = {}\n    tomb = set()\n    first = {}\n    audit = []\n    for seq, (ver, idx, nid) in enumerate(sel):\n        ev = events[idx]\n        if nid not in first:\n            first[nid] = seq\n        applied = False\n        if ev.get('deleted'):\n            if nid in records:\n                del records[nid]\n                applied = True\n                if policy['tombstone_wins']:\n                    tomb.add(nid)\n            elif policy['tombstone_wins'] and nid not in tomb:\n                tomb.add(nid)\n                applied = True\n        elif nid in tomb:\n            applied = False\n        else:\n            fields = ev.get('fields') or {}\n            if policy['unknown_fields'] == 'drop':\n                fields = {k: v for k, v in fields.items() if k in KNOWN}\n            base = records.get(nid)\n            base = copy.deepcopy(base) if base is not None else {}\n            records[nid] = merge(base, fields, policy)\n            applied = True\n        if applied or policy['audit_all']:\n            audit.append('%s:%d:%s' % (nid, ver, 'applied' if applied else 'blocked'))\n    if policy['order'] == 'id':\n        ids = sorted(records)\n    else:\n        ids = sorted(records, key=lambda n: (first[n], n))\n    return {'records': [{'id': n, 'fields': copy.deepcopy(records[n])} for n in ids], 'audit': audit}\n"}}