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FA-92946 / EV charging session scheduling / Open access

Charging profile stack resolution: relative schedule origin · case 01

Relative profiles step through their periods on the wall clock instead of session elapsed time.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Relative profiles are anchored at their validity start rather than the session start.

THE FAILURE

Relative profiles are anchored at their validity start rather than the session start.

Unsuccessful approach: Taking the later of session start and validity start still misanchors sessions that began later than validity.

Case contract

Each profile has purpose max/default/tx, stack level, validity [valid_from, valid_to) (valid_to None = open), kind absolute (origin valid_from) or relative (origin session_start; skipped when no session) and periods [[offset, amps]] in any order. A profile yields the amps of the last period with offset <= t-origin, or nothing before its first period. Per purpose the highest stack wins (ties: earlier profile). tx replaces default. Effective limit is the minimum of max, tx-or-default and hw_max, ties resolved in that order. Return [amps, source].

Why this case matters

Depot, workplace and public EV chargers schedule sessions against prices, circuit limits and departure deadlines; a wrong decision silently strands a driver or overloads a feeder.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(profiles, t, session_start, hw_max):
    best = {}
    for p in profiles:
        if not (p['valid_from'] <= t and (p['valid_to'] is None or t < p['valid_to'])):
            continue
        if p['kind'] == 'relative':
            if session_start is None:
                continue
            origin = p['valid_from']
        else:
            origin = p['valid_from']
        el = t - origin
        lim = None
        for off, val in sorted(p['periods']):
            if off <= el:
                lim = val
        if lim is None:
            continue
        cur = best.get(p['purpose'])
        if cur is None or p['stack'] > cur[0]:
            best[p['purpose']] = [p['stack'], lim]
    cands = []
    if 'max' in best:
        cands.append(['max', best['max'][1]])
    if 'tx' in best:
        cands.append(['tx', best['tx'][1]])
    elif 'default' in best:
        cands.append(['default', best['default'][1]])
    cands.append(['hw', hw_max])
    win = cands[0]
    for c in cands[1:]:
        if c[1] < win[1]:
            win = c
    return [win[1], win[0]]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 6,
      'valid_to': 42,
      'kind': 'relative',
      'periods': [[0, 20], [10, 16]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 59,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 32]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[10, 32], [0, 6]]}],
    12, 0, 24],
   [16, 'tx']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 49,
      'valid_to': 55,
      'kind': 'relative',
      'periods': [[30, 20], [10, 10], [0, 20]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 51,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[30, 32], [0, 6], [0, 10]]}],
    59, 20, 16],
   [16, 'hw']],
  ['control 1',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 44,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 10], [0, 10], [5, 10]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 7,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 10], [30, 20]]}],
    3, None, 24],
   [24, 'hw']],
  ['control 2',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 11,
      'valid_to': 21,
      'kind': 'relative',
      'periods': [[30, 32], [10, 20], [45, 6]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 14,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 19,
      'valid_to': 56,
      'kind': 'absolute',
      'periods': [[0, 6], [45, 10], [20, 16]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 53,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 10], [0, 32], [0, 20]]}],
    97, None, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 60,
      'valid_to': 79,
      'kind': 'relative',
      'periods': [[0, 6], [30, 32], [5, 16]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 21,
      'valid_to': 94,
      'kind': 'relative',
      'periods': [[5, 6], [30, 16], [0, 20]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 56,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32], [10, 6]]}],
    30, 58, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 39,
      'valid_to': 113,
      'kind': 'relative',
      'periods': [[30, 10], [20, 32]]}],
    54, 7, 16],
   [10, 'max']],
  ['control 1',
   [[{'purpose': 'default',
      'stack': 2,
      'valid_from': 20,
      'valid_to': 56,
      'kind': 'relative',
      'periods': [[20, 10], [10, 20]]}],
    53, 38, 24],
   [20, 'default']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 43,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 44,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[45, 32], [45, 6], [20, 20]]}],
    88, 57, 24],
   [24, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 30,
      'valid_to': 93,
      'kind': 'absolute',
      'periods': [[20, 6], [45, 10]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 14,
      'valid_to': 89,
      'kind': 'relative',
      'periods': [[10, 16], [45, 20]]}],
    43, 36, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 22,
      'valid_to': 86,
      'kind': 'relative',
      'periods': [[30, 10], [10, 20], [45, 32]]}],
    51, 2, 24],
   [24, 'hw']],
  ['control 1',
   [[{'purpose': 'tx',
      'stack': 2,
      'valid_from': 29,
      'valid_to': 52,
      'kind': 'absolute',
      'periods': [[30, 16], [45, 32], [0, 16]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 13,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6], [0, 10], [45, 16]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 58,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 16]]}],
    74, None, 24],
   [16, 'max']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6], [10, 6], [20, 32]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 59,
      'valid_to': 85,
      'kind': 'absolute',
      'periods': [[5, 6], [5, 20], [30, 20]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 29,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 10], [30, 10]]}],
    15, 48, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 34,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 16], [0, 32]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 25,
      'valid_to': 27,
      'kind': 'relative',
      'periods': [[20, 32], [0, 20], [45, 16]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 19,
      'valid_to': 59,
      'kind': 'relative',
      'periods': [[45, 16], [45, 32], [0, 6]]}],
    23, 45, 24],
   [24, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 0,
      'valid_from': 9,
      'valid_to': 26,
      'kind': 'absolute',
      'periods': [[30, 6]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 36,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6], [10, 32], [10, 10]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 54,
      'valid_to': 130,
      'kind': 'relative',
      'periods': [[30, 32], [10, 10], [30, 6]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 29,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6], [20, 20], [5, 32]]}],
    81, 13, 32],
   [32, 'tx']],
  ['control 1',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 22,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[30, 6]]},
     {'purpose': 'default',
      'stack': 0,
      'valid_from': 34,
      'valid_to': 106,
      'kind': 'absolute',
      'periods': [[30, 16], [30, 10]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 11,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[10, 6], [30, 20]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 26,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 6], [5, 6], [45, 10]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 12,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 32], [20, 6]]}],
    77, None, 24],
   [20, 'tx']],
  ['control 2',
   [[{'purpose': 'default',
      'stack': 2,
      'valid_from': 55,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[5, 10], [30, 10]]}],
    25, 14, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 16], [10, 20]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 12,
      'valid_to': 24,
      'kind': 'relative',
      'periods': [[0, 10]]}],
    30, 54, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 24,
      'valid_to': 74,
      'kind': 'relative',
      'periods': [[45, 10]]},
     {'purpose': 'max',
      'stack': 2,
      'valid_from': 43,
      'valid_to': 81,
      'kind': 'relative',
      'periods': [[20, 10]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 3,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 16], [20, 20]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 20,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[45, 20], [5, 32]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 5,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 32], [30, 16], [0, 20]]}],
    56, 8, 16],
   [10, 'max']],
  ['control 1',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6]]}],
    71, 15, 16],
   [6, 'tx']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 2,
      'valid_from': 39,
      'valid_to': 108,
      'kind': 'absolute',
      'periods': [[20, 16], [30, 32], [20, 20]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 45,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 20]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 21,
      'valid_to': 46,
      'kind': 'absolute',
      'periods': [[5, 20]]}],
    34, None, 24],
   [20, 'default']]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
boundary: profile expires at t[32, 'hw'][32, 'hw']Passed
boundary: relative profile without session[32, 'hw'][32, 'hw']Passed
boundary: tx overrides lower default[20, 'tx'][20, 'tx']Passed
regression: relative schedule origin[20, 'tx'][16, 'tx']Failed
regression: relative schedule origin (partial repair)[10, 'tx'][16, 'hw']Failed
control 1[24, 'hw'][24, 'hw']Passed
control 2[16, 'hw'][16, 'hw']Passed

SHA-256 / 893b0e57aa79d8119d4b937965459372be38c4edde0a4febd3ffdc547b444615

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(profiles, t, session_start, hw_max):
    best = {}
    for p in profiles:
        if not (p['valid_from'] <= t and (p['valid_to'] is None or t < p['valid_to'])):
            continue
        if p['kind'] == 'relative':
            if session_start is None:
                continue
            origin = max(session_start, p['valid_from'])
        else:
            origin = p['valid_from']
        el = t - origin
        lim = None
        for off, val in sorted(p['periods']):
            if off <= el:
                lim = val
        if lim is None:
            continue
        cur = best.get(p['purpose'])
        if cur is None or p['stack'] > cur[0]:
            best[p['purpose']] = [p['stack'], lim]
    cands = []
    if 'max' in best:
        cands.append(['max', best['max'][1]])
    if 'tx' in best:
        cands.append(['tx', best['tx'][1]])
    elif 'default' in best:
        cands.append(['default', best['default'][1]])
    cands.append(['hw', hw_max])
    win = cands[0]
    for c in cands[1:]:
        if c[1] < win[1]:
            win = c
    return [win[1], win[0]]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 6,
      'valid_to': 42,
      'kind': 'relative',
      'periods': [[0, 20], [10, 16]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 59,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 32]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[10, 32], [0, 6]]}],
    12, 0, 24],
   [16, 'tx']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 49,
      'valid_to': 55,
      'kind': 'relative',
      'periods': [[30, 20], [10, 10], [0, 20]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 51,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[30, 32], [0, 6], [0, 10]]}],
    59, 20, 16],
   [16, 'hw']],
  ['control 1',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 44,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 10], [0, 10], [5, 10]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 7,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 10], [30, 20]]}],
    3, None, 24],
   [24, 'hw']],
  ['control 2',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 11,
      'valid_to': 21,
      'kind': 'relative',
      'periods': [[30, 32], [10, 20], [45, 6]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 14,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 19,
      'valid_to': 56,
      'kind': 'absolute',
      'periods': [[0, 6], [45, 10], [20, 16]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 53,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 10], [0, 32], [0, 20]]}],
    97, None, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 60,
      'valid_to': 79,
      'kind': 'relative',
      'periods': [[0, 6], [30, 32], [5, 16]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 21,
      'valid_to': 94,
      'kind': 'relative',
      'periods': [[5, 6], [30, 16], [0, 20]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 56,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32], [10, 6]]}],
    30, 58, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 39,
      'valid_to': 113,
      'kind': 'relative',
      'periods': [[30, 10], [20, 32]]}],
    54, 7, 16],
   [10, 'max']],
  ['control 1',
   [[{'purpose': 'default',
      'stack': 2,
      'valid_from': 20,
      'valid_to': 56,
      'kind': 'relative',
      'periods': [[20, 10], [10, 20]]}],
    53, 38, 24],
   [20, 'default']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 43,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 32]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 44,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[45, 32], [45, 6], [20, 20]]}],
    88, 57, 24],
   [24, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 30,
      'valid_to': 93,
      'kind': 'absolute',
      'periods': [[20, 6], [45, 10]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 14,
      'valid_to': 89,
      'kind': 'relative',
      'periods': [[10, 16], [45, 20]]}],
    43, 36, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 22,
      'valid_to': 86,
      'kind': 'relative',
      'periods': [[30, 10], [10, 20], [45, 32]]}],
    51, 2, 24],
   [24, 'hw']],
  ['control 1',
   [[{'purpose': 'tx',
      'stack': 2,
      'valid_from': 29,
      'valid_to': 52,
      'kind': 'absolute',
      'periods': [[30, 16], [45, 32], [0, 16]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 13,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6], [0, 10], [45, 16]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 58,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[10, 16]]}],
    74, None, 24],
   [16, 'max']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6], [10, 6], [20, 32]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 59,
      'valid_to': 85,
      'kind': 'absolute',
      'periods': [[5, 6], [5, 20], [30, 20]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 29,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 10], [30, 10]]}],
    15, 48, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 34,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 16], [0, 32]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 25,
      'valid_to': 27,
      'kind': 'relative',
      'periods': [[20, 32], [0, 20], [45, 16]]},
     {'purpose': 'max',
      'stack': 1,
      'valid_from': 19,
      'valid_to': 59,
      'kind': 'relative',
      'periods': [[45, 16], [45, 32], [0, 6]]}],
    23, 45, 24],
   [24, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 0,
      'valid_from': 9,
      'valid_to': 26,
      'kind': 'absolute',
      'periods': [[30, 6]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 36,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6], [10, 32], [10, 10]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 54,
      'valid_to': 130,
      'kind': 'relative',
      'periods': [[30, 32], [10, 10], [30, 6]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 29,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6], [20, 20], [5, 32]]}],
    81, 13, 32],
   [32, 'tx']],
  ['control 1',
   [[{'purpose': 'max',
      'stack': 2,
      'valid_from': 22,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[30, 6]]},
     {'purpose': 'default',
      'stack': 0,
      'valid_from': 34,
      'valid_to': 106,
      'kind': 'absolute',
      'periods': [[30, 16], [30, 10]]},
     {'purpose': 'tx',
      'stack': 2,
      'valid_from': 11,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[10, 6], [30, 20]]},
     {'purpose': 'default',
      'stack': 2,
      'valid_from': 26,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 6], [5, 6], [45, 10]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 12,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[20, 32], [20, 6]]}],
    77, None, 24],
   [20, 'tx']],
  ['control 2',
   [[{'purpose': 'default',
      'stack': 2,
      'valid_from': 55,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[5, 10], [30, 10]]}],
    25, 14, 16],
   [16, 'hw']]],
 [['boundary: profile expires at t',
   [[{'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': 30,
      'kind': 'absolute',
      'periods': [[0, 10]]}],
    30, None, 32],
   [32, 'hw']],
  ['boundary: relative profile without session',
   [[{'purpose': 'default',
      'stack': 1,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 8]]}],
    20, None, 32],
   [32, 'hw']],
  ['boundary: tx overrides lower default',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 6]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[0, 20]]}],
    5, 0, 32],
   [20, 'tx']],
  ['regression: relative schedule origin',
   [[{'purpose': 'default',
      'stack': 0,
      'valid_from': 0,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 16], [10, 20]]},
     {'purpose': 'tx',
      'stack': 0,
      'valid_from': 12,
      'valid_to': 24,
      'kind': 'relative',
      'periods': [[0, 10]]}],
    30, 54, 32],
   [32, 'hw']],
  ['regression: relative schedule origin (partial repair)',
   [[{'purpose': 'max',
      'stack': 1,
      'valid_from': 24,
      'valid_to': 74,
      'kind': 'relative',
      'periods': [[45, 10]]},
     {'purpose': 'max',
      'stack': 2,
      'valid_from': 43,
      'valid_to': 81,
      'kind': 'relative',
      'periods': [[20, 10]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 3,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 16], [20, 20]]},
     {'purpose': 'tx',
      'stack': 1,
      'valid_from': 20,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[45, 20], [5, 32]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 5,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[0, 32], [30, 16], [0, 20]]}],
    56, 8, 16],
   [10, 'max']],
  ['control 1',
   [[{'purpose': 'tx',
      'stack': 1,
      'valid_from': 8,
      'valid_to': None,
      'kind': 'absolute',
      'periods': [[30, 6]]}],
    71, 15, 16],
   [6, 'tx']],
  ['control 2',
   [[{'purpose': 'tx',
      'stack': 2,
      'valid_from': 39,
      'valid_to': 108,
      'kind': 'absolute',
      'periods': [[20, 16], [30, 32], [20, 20]]},
     {'purpose': 'max',
      'stack': 0,
      'valid_from': 45,
      'valid_to': None,
      'kind': 'relative',
      'periods': [[5, 20]]},
     {'purpose': 'default',
      'stack': 1,
      'valid_from': 21,
      'valid_to': 46,
      'kind': 'absolute',
      'periods': [[5, 20]]}],
    34, None, 24],
   [20, 'default']]]]
for label, args, expected in fixtures[N-1]:
    check(label, solve(*args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
boundary: profile expires at t[32, 'hw'][32, 'hw']Passed
boundary: relative profile without session[32, 'hw'][32, 'hw']Passed
boundary: tx overrides lower default[20, 'tx'][20, 'tx']Passed
regression: relative schedule origin[20, 'tx'][16, 'tx']Failed
regression: relative schedule origin (partial repair)[10, 'tx'][16, 'hw']Failed
control 1[24, 'hw'][24, 'hw']Passed
control 2[16, 'hw'][16, 'hw']Passed

SHA-256 / abcda29735b1bf60ce772ffa4c314ec219d1a092d392633f2fe8e1aaac63f493

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

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Verification & scope

Deterministic stipulated toy contract for teaching; no claim of conformance with any standard, vendor protocol or production controller. 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.

Observations recorded using Python 3.12.14 at 2026-09-29T14:51:50.563740+00:00.

Case digest / 56429235b0a288e5fda953682a1dc98d1556b34b410fac1f16de71abebeda542