{"abstract":"Renewals on the lock expiry day lose the locked price.","category":"Subscription proration billing","checks":8,"contract":"Input {last_paid, list_price, locked|None, lock_until, renewal_day, cap_pct}. While the lock is active (renewal_day <= lock_until) the target is min(list_price, locked); otherwise list_price. The renewal price is min(target, last_paid*(100+cap_pct)//100). Return cents.","contract_signature":"x","evaluation_group":"w2-subscription-proration-renewal-price-lock","failed_approach":"The attempt honors the lock one day past its expiry.","family":"w2-subscription-proration-renewal-price-lock-lock-expiry-day","id":"FA-59796","implementations":{"attempt":{"sha256":"c95dd8cde9780f60e915d3b5ab3a234039bd32108acc39f2d1e2e3791f4a92c2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    if x['locked'] is not None and x['renewal_day'] <= x['lock_until'] + 1:\n        target = min(x['list_price'], x['locked'])\n    else:\n        target = x['list_price']\n    ceiling = x['last_paid'] * (100 + x['cap_pct']) // 100\n    return min(target, ceiling)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression', {'last_paid': 6548, 'list_price': 6483, 'locked': 6448, 'lock_until': 196, 'renewal_day': 196, 'cap_pct': 5}, 6448), ('regression', {'last_paid': 2000, 'list_price': 3042, 'locked': 1900, 'lock_until': 55, 'renewal_day': 55, 'cap_pct': 5}, 1900), ('partial-repair probe', {'last_paid': 2000, 'list_price': 3442, 'locked': 2000, 'lock_until': 83, 'renewal_day': 84, 'cap_pct': 5}, 2100), ('partial-repair probe', {'last_paid': 2000, 'list_price': 4561, 'locked': 1900, 'lock_until': 96, 'renewal_day': 97, 'cap_pct': 20}, 2400), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1500, 'lock_until': 328, 'renewal_day': 201, 'cap_pct': 20}, 1000), ('normal control', {'last_paid': 2000, 'list_price': 3312, 'locked': 2500, 'lock_until': 173, 'renewal_day': 173, 'cap_pct': 20}, 2400), ('normal control', {'last_paid': 4900, 'list_price': 4900, 'locked': None, 'lock_until': 83, 'renewal_day': 100, 'cap_pct': 20}, 4900), ('normal control', {'last_paid': 222, 'list_price': 222, 'locked': 222, 'lock_until': 231, 'renewal_day': 231, 'cap_pct': 5}, 222)], [('regression', {'last_paid': 2000, 'list_price': 3042, 'locked': 1900, 'lock_until': 55, 'renewal_day': 55, 'cap_pct': 5}, 1900), ('regression', {'last_paid': 5437, 'list_price': 5507, 'locked': 5337, 'lock_until': 225, 'renewal_day': 225, 'cap_pct': 5}, 5337), ('partial-repair probe', {'last_paid': 4984, 'list_price': 7349, 'locked': 4984, 'lock_until': 94, 'renewal_day': 95, 'cap_pct': 20}, 5980), ('partial-repair probe', {'last_paid': 7649, 'list_price': 7649, 'locked': 7549, 'lock_until': 183, 'renewal_day': 184, 'cap_pct': 10}, 7649), ('normal control', {'last_paid': 4217, 'list_price': 4172, 'locked': 4217, 'lock_until': 1, 'renewal_day': 2, 'cap_pct': 0}, 4172), ('normal control', {'last_paid': 4900, 'list_price': 4441, 'locked': 4900, 'lock_until': 309, 'renewal_day': 310, 'cap_pct': 0}, 4441), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': 2000, 'lock_until': 91, 'renewal_day': 92, 'cap_pct': 5}, 2000), ('normal control', {'last_paid': 4900, 'list_price': 4900, 'locked': 4900, 'lock_until': 26, 'renewal_day': 27, 'cap_pct': 5}, 4900)], [('regression', {'last_paid': 5437, 'list_price': 5507, 'locked': 5337, 'lock_until': 225, 'renewal_day': 225, 'cap_pct': 5}, 5337), ('regression', {'last_paid': 2000, 'list_price': 3888, 'locked': 2000, 'lock_until': 333, 'renewal_day': 333, 'cap_pct': 10}, 2000), ('partial-repair probe', {'last_paid': 2000, 'list_price': 2000, 'locked': 1900, 'lock_until': 374, 'renewal_day': 375, 'cap_pct': 0}, 2000), ('partial-repair probe', {'last_paid': 4900, 'list_price': 5949, 'locked': 4900, 'lock_until': 379, 'renewal_day': 380, 'cap_pct': 10}, 5390), ('normal control', {'last_paid': 4900, 'list_price': 7407, 'locked': None, 'lock_until': 112, 'renewal_day': 113, 'cap_pct': 5}, 5145), ('normal control', {'last_paid': 485, 'list_price': 654, 'locked': None, 'lock_until': 58, 'renewal_day': 58, 'cap_pct': 20}, 582), ('normal control', {'last_paid': 1219, 'list_price': 1057, 'locked': 1119, 'lock_until': 293, 'renewal_day': 294, 'cap_pct': 10}, 1057), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1000, 'lock_until': 85, 'renewal_day': 85, 'cap_pct': 20}, 1000)], [('regression', {'last_paid': 2000, 'list_price': 3888, 'locked': 2000, 'lock_until': 333, 'renewal_day': 333, 'cap_pct': 10}, 2000), ('regression', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 392, 'renewal_day': 392, 'cap_pct': 5}, 900), ('partial-repair probe', {'last_paid': 7896, 'list_price': 8057, 'locked': 7896, 'lock_until': 71, 'renewal_day': 72, 'cap_pct': 20}, 8057), ('partial-repair probe', {'last_paid': 4900, 'list_price': 5888, 'locked': 5400, 'lock_until': 13, 'renewal_day': 14, 'cap_pct': 20}, 5880), ('normal control', {'last_paid': 2000, 'list_price': 3222, 'locked': 2500, 'lock_until': 57, 'renewal_day': 260, 'cap_pct': 0}, 2000), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1500, 'lock_until': 110, 'renewal_day': 262, 'cap_pct': 10}, 1000), ('normal control', {'last_paid': 7522, 'list_price': 7059, 'locked': 8022, 'lock_until': 19, 'renewal_day': 388, 'cap_pct': 20}, 7059), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': None, 'lock_until': 285, 'renewal_day': 285, 'cap_pct': 20}, 2000)], [('regression', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 392, 'renewal_day': 392, 'cap_pct': 5}, 900), ('regression', {'last_paid': 3101, 'list_price': 3101, 'locked': 3001, 'lock_until': 113, 'renewal_day': 113, 'cap_pct': 10}, 3001), ('partial-repair probe', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 109, 'renewal_day': 110, 'cap_pct': 5}, 1000), ('partial-repair probe', {'last_paid': 8551, 'list_price': 8551, 'locked': 8451, 'lock_until': 130, 'renewal_day': 131, 'cap_pct': 0}, 8551), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': None, 'lock_until': 173, 'renewal_day': 263, 'cap_pct': 5}, 2000), ('normal control', {'last_paid': 4105, 'list_price': 4394, 'locked': 4005, 'lock_until': 133, 'renewal_day': 322, 'cap_pct': 20}, 4394), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': 2500, 'lock_until': 167, 'renewal_day': 167, 'cap_pct': 10}, 2000), ('normal control', {'last_paid': 4900, 'list_price': 5180, 'locked': 4900, 'lock_until': 0, 'renewal_day': 66, 'cap_pct': 20}, 5180)]]\nfor i, (label, args, expected) in enumerate(fixtures[N-1]):\n    check(\"%s %d\" % (label, i), solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"3024e28af4edf0ce484f5793799c65ba7bbf1522c792273043f1bbbf4c3e5eb3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(x):\n    if x['locked'] is not None and x['renewal_day'] < x['lock_until']:\n        target = min(x['list_price'], x['locked'])\n    else:\n        target = x['list_price']\n    ceiling = x['last_paid'] * (100 + x['cap_pct']) // 100\n    return min(target, ceiling)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nfixtures = [[('regression', {'last_paid': 6548, 'list_price': 6483, 'locked': 6448, 'lock_until': 196, 'renewal_day': 196, 'cap_pct': 5}, 6448), ('regression', {'last_paid': 2000, 'list_price': 3042, 'locked': 1900, 'lock_until': 55, 'renewal_day': 55, 'cap_pct': 5}, 1900), ('partial-repair probe', {'last_paid': 2000, 'list_price': 3442, 'locked': 2000, 'lock_until': 83, 'renewal_day': 84, 'cap_pct': 5}, 2100), ('partial-repair probe', {'last_paid': 2000, 'list_price': 4561, 'locked': 1900, 'lock_until': 96, 'renewal_day': 97, 'cap_pct': 20}, 2400), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1500, 'lock_until': 328, 'renewal_day': 201, 'cap_pct': 20}, 1000), ('normal control', {'last_paid': 2000, 'list_price': 3312, 'locked': 2500, 'lock_until': 173, 'renewal_day': 173, 'cap_pct': 20}, 2400), ('normal control', {'last_paid': 4900, 'list_price': 4900, 'locked': None, 'lock_until': 83, 'renewal_day': 100, 'cap_pct': 20}, 4900), ('normal control', {'last_paid': 222, 'list_price': 222, 'locked': 222, 'lock_until': 231, 'renewal_day': 231, 'cap_pct': 5}, 222)], [('regression', {'last_paid': 2000, 'list_price': 3042, 'locked': 1900, 'lock_until': 55, 'renewal_day': 55, 'cap_pct': 5}, 1900), ('regression', {'last_paid': 5437, 'list_price': 5507, 'locked': 5337, 'lock_until': 225, 'renewal_day': 225, 'cap_pct': 5}, 5337), ('partial-repair probe', {'last_paid': 4984, 'list_price': 7349, 'locked': 4984, 'lock_until': 94, 'renewal_day': 95, 'cap_pct': 20}, 5980), ('partial-repair probe', {'last_paid': 7649, 'list_price': 7649, 'locked': 7549, 'lock_until': 183, 'renewal_day': 184, 'cap_pct': 10}, 7649), ('normal control', {'last_paid': 4217, 'list_price': 4172, 'locked': 4217, 'lock_until': 1, 'renewal_day': 2, 'cap_pct': 0}, 4172), ('normal control', {'last_paid': 4900, 'list_price': 4441, 'locked': 4900, 'lock_until': 309, 'renewal_day': 310, 'cap_pct': 0}, 4441), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': 2000, 'lock_until': 91, 'renewal_day': 92, 'cap_pct': 5}, 2000), ('normal control', {'last_paid': 4900, 'list_price': 4900, 'locked': 4900, 'lock_until': 26, 'renewal_day': 27, 'cap_pct': 5}, 4900)], [('regression', {'last_paid': 5437, 'list_price': 5507, 'locked': 5337, 'lock_until': 225, 'renewal_day': 225, 'cap_pct': 5}, 5337), ('regression', {'last_paid': 2000, 'list_price': 3888, 'locked': 2000, 'lock_until': 333, 'renewal_day': 333, 'cap_pct': 10}, 2000), ('partial-repair probe', {'last_paid': 2000, 'list_price': 2000, 'locked': 1900, 'lock_until': 374, 'renewal_day': 375, 'cap_pct': 0}, 2000), ('partial-repair probe', {'last_paid': 4900, 'list_price': 5949, 'locked': 4900, 'lock_until': 379, 'renewal_day': 380, 'cap_pct': 10}, 5390), ('normal control', {'last_paid': 4900, 'list_price': 7407, 'locked': None, 'lock_until': 112, 'renewal_day': 113, 'cap_pct': 5}, 5145), ('normal control', {'last_paid': 485, 'list_price': 654, 'locked': None, 'lock_until': 58, 'renewal_day': 58, 'cap_pct': 20}, 582), ('normal control', {'last_paid': 1219, 'list_price': 1057, 'locked': 1119, 'lock_until': 293, 'renewal_day': 294, 'cap_pct': 10}, 1057), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1000, 'lock_until': 85, 'renewal_day': 85, 'cap_pct': 20}, 1000)], [('regression', {'last_paid': 2000, 'list_price': 3888, 'locked': 2000, 'lock_until': 333, 'renewal_day': 333, 'cap_pct': 10}, 2000), ('regression', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 392, 'renewal_day': 392, 'cap_pct': 5}, 900), ('partial-repair probe', {'last_paid': 7896, 'list_price': 8057, 'locked': 7896, 'lock_until': 71, 'renewal_day': 72, 'cap_pct': 20}, 8057), ('partial-repair probe', {'last_paid': 4900, 'list_price': 5888, 'locked': 5400, 'lock_until': 13, 'renewal_day': 14, 'cap_pct': 20}, 5880), ('normal control', {'last_paid': 2000, 'list_price': 3222, 'locked': 2500, 'lock_until': 57, 'renewal_day': 260, 'cap_pct': 0}, 2000), ('normal control', {'last_paid': 1000, 'list_price': 1000, 'locked': 1500, 'lock_until': 110, 'renewal_day': 262, 'cap_pct': 10}, 1000), ('normal control', {'last_paid': 7522, 'list_price': 7059, 'locked': 8022, 'lock_until': 19, 'renewal_day': 388, 'cap_pct': 20}, 7059), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': None, 'lock_until': 285, 'renewal_day': 285, 'cap_pct': 20}, 2000)], [('regression', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 392, 'renewal_day': 392, 'cap_pct': 5}, 900), ('regression', {'last_paid': 3101, 'list_price': 3101, 'locked': 3001, 'lock_until': 113, 'renewal_day': 113, 'cap_pct': 10}, 3001), ('partial-repair probe', {'last_paid': 1000, 'list_price': 1000, 'locked': 900, 'lock_until': 109, 'renewal_day': 110, 'cap_pct': 5}, 1000), ('partial-repair probe', {'last_paid': 8551, 'list_price': 8551, 'locked': 8451, 'lock_until': 130, 'renewal_day': 131, 'cap_pct': 0}, 8551), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': None, 'lock_until': 173, 'renewal_day': 263, 'cap_pct': 5}, 2000), ('normal control', {'last_paid': 4105, 'list_price': 4394, 'locked': 4005, 'lock_until': 133, 'renewal_day': 322, 'cap_pct': 20}, 4394), ('normal control', {'last_paid': 2000, 'list_price': 2000, 'locked': 2500, 'lock_until': 167, 'renewal_day': 167, 'cap_pct': 10}, 2000), ('normal control', {'last_paid': 4900, 'list_price': 5180, 'locked': 4900, 'lock_until': 0, 'renewal_day': 66, 'cap_pct': 20}, 5180)]]\nfor i, (label, args, expected) in enumerate(fixtures[N-1]):\n    check(\"%s %d\" % (label, i), solve(args), expected)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"A deterministic teaching model of a stipulated billing rule. It makes no claim to reproduce any billing provider's exact behaviour and is not billing software. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w2-subscription-proration-renewal-price-lock-lock-expiry-day","generated_at":"2026-09-29T14:46:39.628223+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Grandfathered prices and increase caps protect renewing subscribers; their interplay sets the renewal amount.","root_cause":"The lock is treated as expired on its last valid day.","sha256":"475f8e58529adddf149f566b8268996d9da9885f362eb90f9e258374e9cfa3c7","title":"Renewal price with lock and increase cap: lock expiry day · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.765,"exit_code":1,"observations":[{"actual":6448,"check":"regression 0","expected":6448,"passed":true},{"actual":1900,"check":"regression 1","expected":1900,"passed":true},{"actual":2000,"check":"partial-repair probe 2","expected":2100,"passed":false},{"actual":1900,"check":"partial-repair probe 3","expected":2400,"passed":false},{"actual":1000,"check":"normal control 4","expected":1000,"passed":true},{"actual":2400,"check":"normal control 5","expected":2400,"passed":true},{"actual":4900,"check":"normal control 6","expected":4900,"passed":true},{"actual":222,"check":"normal control 7","expected":222,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression 0\", \"actual\": 6448, \"expected\": 6448, \"passed\": true}, {\"check\": \"regression 1\", \"actual\": 1900, \"expected\": 1900, \"passed\": true}, {\"check\": \"partial-repair probe 2\", \"actual\": 2000, \"expected\": 2100, \"passed\": false}, {\"check\": \"partial-repair probe 3\", \"actual\": 1900, \"expected\": 2400, \"passed\": false}, {\"check\": \"normal control 4\", \"actual\": 1000, \"expected\": 1000, \"passed\": true}, {\"check\": \"normal control 5\", \"actual\": 2400, \"expected\": 2400, \"passed\": true}, {\"check\": \"normal control 6\", \"actual\": 4900, \"expected\": 4900, \"passed\": true}, {\"check\": \"normal control 7\", \"actual\": 222, \"expected\": 222, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":41.777,"exit_code":1,"observations":[{"actual":6483,"check":"regression 0","expected":6448,"passed":false},{"actual":2100,"check":"regression 1","expected":1900,"passed":false},{"actual":2100,"check":"partial-repair probe 2","expected":2100,"passed":true},{"actual":2400,"check":"partial-repair probe 3","expected":2400,"passed":true},{"actual":1000,"check":"normal control 4","expected":1000,"passed":true},{"actual":2400,"check":"normal control 5","expected":2400,"passed":true},{"actual":4900,"check":"normal control 6","expected":4900,"passed":true},{"actual":222,"check":"normal control 7","expected":222,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"regression 0\", \"actual\": 6483, \"expected\": 6448, \"passed\": false}, {\"check\": \"regression 1\", \"actual\": 2100, \"expected\": 1900, \"passed\": false}, {\"check\": \"partial-repair probe 2\", \"actual\": 2100, \"expected\": 2100, \"passed\": true}, {\"check\": \"partial-repair probe 3\", \"actual\": 2400, \"expected\": 2400, \"passed\": true}, {\"check\": \"normal control 4\", \"actual\": 1000, \"expected\": 1000, \"passed\": true}, {\"check\": \"normal control 5\", \"actual\": 2400, \"expected\": 2400, \"passed\": true}, {\"check\": \"normal control 6\", \"actual\": 4900, \"expected\": 4900, \"passed\": true}, {\"check\": \"normal control 7\", \"actual\": 222, \"expected\": 222, \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}