Add feedback-aligned material efficiency KPI

README.md

@@ -249,9 +249,128 @@ semantics. `feedback_timestamp` is preserved exactly, including a naive timezone
 It represents the latest ERP feedback, and the ERP export is delayed relative to
 live process data; the adapter makes no freshness inference.
 
-This milestone adds no kg/m² or material-efficiency calculation, ERP-to-ENLYZE
-order mapping, persistence, polling, CLI, or Grafana integration. Automated ERP
-tests use mocks and require no live connectivity.
+Automated ERP tests use mocks and require no live connectivity.
+
+## ERP context normalization
+
+Two pure helpers in `production_analytics.context` prepare context for later KPIs:
+
+- `build_enlyze_production_order(erp_production_order, format_template) -> str`
+  uses an explicit template configured by the caller per machine/workplace.
+  The template requires exactly one literal `{production_order}` placeholder and
+  no other braces; invalid templates raise `ValueError`.
+  Outer ERP-order whitespace is stripped and the
+  remaining order must contain only ASCII digits. Leading zeros are preserved.
+  Empty/invalid orders raise `ValueError`. There is no default machine rule.
+- `extract_nominal_width_m(article_description: str | None) -> float | None`
+  is generic across machines and conservatively reads a single
+  `<width> x <length> m` pair, accepting decimal
+  comma/point and variable whitespace. For example, `Stex R 1501 C (PR) 5,80 x 50 m`
+  yields `5.8`. Earlier article numbers and trailing descriptive text are ignored.
+  Missing, malformed, multiple or chained dimension patterns return `None`, as do
+  non-positive/non-finite dimensions. Signed/scientific notation and other units
+  are deliberately unsupported; both dimensions must be positive plain numbers.
+
+K7 currently uses the explicit template `K 7-{production_order}`:
+
+```python
+k7_order_template = "K 7-{production_order}"
+enlyze_order = build_enlyze_production_order("12026000815", k7_order_template)
+# "K 7-12026000815"
+```
+
+Future machines may supply different verified templates without changing the
+generic helper. Template selection belongs to machine/workplace configuration
+or adapters; the helper contains no workplace lookup or machine-specific branch.
+No other machine rule is introduced here.
+
+ENLYZE production-order identifiers remain opaque everywhere else, with exact
+comparison. These helpers never reverse-parse or split ENLYZE orders, including
+combined identifiers such as `K 7-12025000074-K 7-12025000075`; passing such an
+identifier to the ERP mapping function is rejected.
+
+Nominal finished-product width currently comes from ERP article-description
+parsing because neither verified DWH view (`dbo.GRAFANA_WORKPLACE_STATUS` and
+`dbo.GRAFANA_PRODUCTION_CONFIRMATION`) has a dedicated width column. ENLYZE
+`wLg1MeasuringWidth` (`Produktbreite`) is explicitly not used as K7 nominal
+finished-product width:
+it belongs to the MAHLO measurement system and observed values differ from nominal
+article widths. Structured ERP product master data would be preferred when available.
+
+These helpers are independent of database access. The service below composes them
+for material efficiency; no background processing is attached.
+
+## Feedback-aligned material efficiency
+
+`MaterialEfficiencyService` in `service.material_efficiency` combines ERP good area
+with cumulative material consumption for one exact production order. Its
+`evaluate_current()` reads the existing ERP workplace adapter once; `evaluate(status)`
+evaluates an already supplied `CurrentWorkplaceStatus`. Both return an immutable
+`MaterialEfficiencySnapshot` or `None` when inputs are unavailable.
+
+`PostgresMaterialSnapshotRepository(settings).latest_at_or_before(...)` in
+`service.postgres_material` takes keyword arguments `calculation_id`, `machine_id`,
+`production_order`, and an aware `timestamp`. A parameterized query selects the
+latest snapshot **at or before ERP feedback time**, matching calculation, machine,
+and mapped order exactly. It returns `MaterialConsumptionSnapshot` or `None`.
+Run IDs do not restrict this lookup: stored consumption is already cumulative
+across the order's runs. The service neither reintegrates nor sums snapshots and
+does not bridge run boundaries.
+
+The result includes workplace/machine/calculation identifiers, both order identifiers,
+article context, nominal width, both original source timestamps, good area, aligned
+consumption, `material_consumption_kg_per_m2 = consumption_kg / good_quantity_m2`,
+and `material_consumption_g_per_m2 = material_consumption_kg_per_m2 * 1000`.
+Nominal width comes from generic ERP description parsing and is context only;
+ERP good square metres remain authoritative even when width cannot be parsed.
+
+Missing ERP status, missing aligned material, missing/non-positive/non-finite good
+area, invalid consumption (negative or non-finite), or non-finite computed ratios
+produce `None`. Zero consumption is valid. Configuration errors, invalid timestamp
+alignment, and database failures raise rather than masquerading as missing data.
+
+All machine/workplace settings are supplied explicitly. Example using the existing
+K7 material calculation (with previously constructed ERP gateway and PG settings):
+
+```python
+from zoneinfo import ZoneInfo
+
+from production_analytics.service.material_efficiency import MaterialEfficiencyService
+from production_analytics.service.postgres_material import PostgresMaterialSnapshotRepository
+
+service = MaterialEfficiencyService(
+    erp_gateway, PostgresMaterialSnapshotRepository(postgres_settings),
+    workplace="K7",
+    machine_id="c220f95c-a65e-4cb7-99b7-0626d6c7508c",
+    calculation_id="k7-fiber-consumption",
+    format_template="K 7-{production_order}",
+    # Supply only after verifying the ERP timestamp's source timezone:
+    erp_timezone=ZoneInfo("Europe/Berlin"),
+)
+result = service.evaluate_current()
+```
+
+Aware ERP timestamps are compared as UTC instants. Naive ERP timestamps require
+explicit `erp_timezone`; there is no inferred system/database timezone. Ambiguous
+or nonexistent local times during DST transitions are rejected. The original ERP
+timestamp (including naivety) and selected material timestamp are preserved in the
+result; retain the source timezone configuration alongside it for interpretation.
+
+This alignment avoids knowingly including future material consumption, but does
+not eliminate ERP roll-feedback timing uncertainty (feedback may be roughly one
+roll ahead or otherwise offset). Live values are plausibility indicators; final
+production-order values are more meaningful as relative timing error diminishes.
+There is no interpolation, lag correction, smoothing, freshness threshold, or
+estimated timestamp. Historical bootstrap snapshots are usable only when their
+stored timestamps satisfy the cutoff; a later cumulative total cannot reconstruct
+an earlier value. Reliable final evaluation requires retaining final ERP feedback;
+the current-workplace adapter alone does not provide historical completed orders.
+
+Call on changed ERP feedback; no new runner or polling loop is provided. Results
+are returned in memory without modifying earlier results or material snapshots.
+No schema, Grafana, or timeseries changes are needed. Daily per-machine 24h reporting
+and aggregation remain future work. Repository SQL selection tests use an in-memory
+SQLite fixture with driver transport adaptation; they require no live PostgreSQL.
 
 ## Peak-cycle detection
 

src/production_analytics/context/__init__.py

@@ -0,0 +1,62 @@
+"""Deterministic ERP context helpers, independent of database and timeseries access."""
+
+import math
+import re
+
+__all__ = ["build_enlyze_production_order", "extract_nominal_width_m"]
+
+# Capture malformed numeric tokens too, so a valid-looking suffix cannot become width.
+_NUMBER_TOKEN = r"[+-]?(?:[0-9]+(?:[.,][0-9]+)*|inf(?:inity)?|nan)(?:[eE][+-]?[0-9]+)?"
+_DIMENSIONS = re.compile(
+    rf"(?<![\w.,+\-/])(?P<width>{_NUMBER_TOKEN})\s*x\s*"
+    rf"(?P<length>{_NUMBER_TOKEN})\s*m(?![\w/²³^])",
+    re.IGNORECASE,
+)
+_PLAIN_NUMBER = re.compile(r"[0-9]+(?:[.,][0-9]+)?")
+
+
+def build_enlyze_production_order(erp_production_order: str, format_template: str) -> str:
+    """Format a single ERP order using explicit caller-supplied configuration.
+
+    The template must contain exactly one literal {production_order} placeholder
+    and no other braces. Outer order whitespace is stripped; the order
+    must otherwise contain ASCII digits only (leading zeros are preserved).
+    This is not a parser for ENLYZE identifiers, combined or otherwise.
+    """
+    order = erp_production_order.strip()
+    if not order or not order.isascii() or not order.isdigit():
+        raise ValueError("ERP production order must be a non-empty ASCII digit string")
+    placeholder = "{production_order}"
+    literal = format_template.replace(placeholder, "")
+    if format_template.count(placeholder) != 1 or "{" in literal or "}" in literal:
+        raise ValueError("Format template must contain exactly one {production_order} placeholder")
+    return format_template.replace(placeholder, order)
+
+
+def extract_nominal_width_m(article_description: str | None) -> float | None:
+    """Read one unambiguous positive '<width> x <length> m' pair from ERP text.
+
+    Decimal comma/point and variable whitespace are supported. Multiple pairs,
+    dimension chains, signed/scientific notation and invalid dimensions fail
+    closed.
+    """
+    if article_description is None:
+        return None
+    matches = list(_DIMENSIONS.finditer(article_description))
+    if len(matches) != 1:
+        return None
+    match = matches[0]
+    # Do not mistake the tail of a three-dimensional expression for a width pair.
+    if re.search(r"[x×]\s*$", article_description[:match.start()], re.IGNORECASE):
+        return None
+    if re.match(r"\s*[x×]", article_description[match.end():], re.IGNORECASE):
+        return None
+    values = []
+    for token in (match["width"], match["length"]):
+        if _PLAIN_NUMBER.fullmatch(token) is None:
+            return None
+        value = float(token.replace(",", "."))
+        if not math.isfinite(value) or value <= 0:
+            return None
+        values.append(value)
+    return values[0]

src/production_analytics/service/material_efficiency.py

@@ -0,0 +1,116 @@
+"""Feedback-aligned, machine-independent production-order material efficiency."""
+
+from dataclasses import dataclass
+from datetime import UTC, datetime
+from math import isfinite
+from typing import Protocol
+from zoneinfo import ZoneInfo
+
+from production_analytics.context import build_enlyze_production_order, extract_nominal_width_m
+from production_analytics.erp import CurrentWorkplaceStatus
+from production_analytics.service.postgres_material import MaterialSnapshotRepository
+
+
+class WorkplaceStatusReader(Protocol):
+    def get_current_workplace_status(self, workplace: str) -> CurrentWorkplaceStatus | None: ...
+
+
+@dataclass(frozen=True, slots=True)
+class MaterialEfficiencySnapshot:
+    workplace: str
+    machine_id: str
+    calculation_id: str
+    erp_production_order: str
+    enlyze_production_order: str
+    article_number: str | None
+    article_description: str | None
+    nominal_width_m: float | None
+    erp_feedback_timestamp: datetime
+    material_snapshot_timestamp: datetime
+    good_quantity_m2: float
+    material_consumption_kg: float
+    material_consumption_kg_per_m2: float
+    material_consumption_g_per_m2: float
+
+
+class MaterialEfficiencyService:
+    def __init__(
+        self, erp: WorkplaceStatusReader, materials: MaterialSnapshotRepository, *,
+        workplace: str, machine_id: str, calculation_id: str, format_template: str,
+        erp_timezone: ZoneInfo | None = None,
+    ) -> None:
+        self.erp = erp
+        self.materials = materials
+        self.workplace = workplace
+        self.machine_id = machine_id
+        self.calculation_id = calculation_id
+        self.format_template = format_template
+        self.erp_timezone = erp_timezone
+
+    def evaluate_current(self) -> MaterialEfficiencySnapshot | None:
+        """Read current ERP feedback once; no scheduling or mutable KPI history."""
+        status = self.erp.get_current_workplace_status(self.workplace)
+        return None if status is None else self.evaluate(status)
+
+    def evaluate(self, status: CurrentWorkplaceStatus) -> MaterialEfficiencySnapshot | None:
+        """Evaluate supplied feedback; missing/invalid numeric inputs yield None.
+
+        Configuration, timestamp and adapter contract errors raise ValueError.
+        Database failures propagate, rather than being treated as missing data.
+        """
+        if status.workplace != self.workplace:
+            raise ValueError("ERP workplace does not match configured workplace")
+        order = build_enlyze_production_order(status.production_order, self.format_template)
+        quantity = status.good_quantity_m2
+        if quantity is None or not isfinite(quantity) or quantity <= 0:
+            return None
+        cutoff = _feedback_instant(status.feedback_timestamp, self.erp_timezone)
+        material = self.materials.latest_at_or_before(
+            calculation_id=self.calculation_id, machine_id=self.machine_id,
+            production_order=order, timestamp=cutoff,
+        )
+        if material is None:
+            return None
+        if (
+            material.calculation_id != self.calculation_id
+            or material.machine_id != self.machine_id
+            or material.production_order != order
+            or material.timestamp.utcoffset() is None
+            or material.timestamp > cutoff
+        ):
+            raise ValueError("Material repository returned an unaligned snapshot")
+        consumption = material.consumption_kg
+        if not isfinite(consumption) or consumption < 0:
+            return None
+        kg_per_m2 = consumption / quantity
+        g_per_m2 = kg_per_m2 * 1000
+        if not isfinite(kg_per_m2) or not isfinite(g_per_m2):
+            return None
+        return MaterialEfficiencySnapshot(
+            workplace=status.workplace, machine_id=self.machine_id,
+            calculation_id=self.calculation_id, erp_production_order=status.production_order,
+            enlyze_production_order=order, article_number=status.article_number,
+            article_description=status.article_description,
+            nominal_width_m=extract_nominal_width_m(status.article_description),
+            erp_feedback_timestamp=status.feedback_timestamp,
+            material_snapshot_timestamp=material.timestamp,
+            good_quantity_m2=quantity, material_consumption_kg=consumption,
+            material_consumption_kg_per_m2=kg_per_m2,
+            material_consumption_g_per_m2=g_per_m2,
+        )
+
+
+def _feedback_instant(timestamp: datetime, timezone: ZoneInfo | None) -> datetime:
+    if timestamp.utcoffset() is not None:
+        return timestamp.astimezone(UTC)
+    if timezone is None:
+        raise ValueError("Naive ERP feedback timestamp requires explicit erp_timezone")
+    # Round trips reject DST gaps; two distinct instants indicate a DST overlap.
+    instants = set()
+    for fold in (0, 1):
+        instant = timestamp.replace(tzinfo=timezone, fold=fold).astimezone(UTC)
+        if instant.astimezone(timezone).replace(tzinfo=None) == timestamp:
+            instants.add(instant)
+    if len(instants) != 1:
+        raise ValueError("ERP feedback timestamp is ambiguous or nonexistent in erp_timezone")
+    return instants.pop()

src/production_analytics/service/postgres_material.py

@@ -1,4 +1,4 @@
-"""PostgreSQL settings and derived material snapshot inserts."""
+"""PostgreSQL settings and derived material snapshot reads/writes."""
 
 from collections.abc import Mapping
 from dataclasses import dataclass, field
@@ -41,6 +41,54 @@ class MaterialSnapshotWriter(Protocol):
     ) -> None: ...
 
 
+@dataclass(frozen=True, slots=True)
+class MaterialConsumptionSnapshot:
+    timestamp: datetime
+    calculation_id: str
+    machine_id: str
+    production_order: str
+    run_id: str
+    consumption_kg: float
+
+
+class MaterialSnapshotRepository(Protocol):
+    def latest_at_or_before(
+        self, *, calculation_id: str, machine_id: str, production_order: str,
+        timestamp: datetime,
+    ) -> MaterialConsumptionSnapshot | None: ...
+
+
+class PostgresMaterialSnapshotRepository:
+    def __init__(self, settings: PostgresSettings) -> None:
+        self.settings = settings
+
+    def latest_at_or_before(
+        self, *, calculation_id: str, machine_id: str, production_order: str,
+        timestamp: datetime,
+    ) -> MaterialConsumptionSnapshot | None:
+        """Read one exact-order cumulative snapshot, never later than the aware cutoff."""
+        if timestamp.utcoffset() is None:
+            raise ValueError("Material snapshot cutoff must be timezone-aware")
+        import psycopg
+
+        with psycopg.connect(
+            host=self.settings.host, port=self.settings.port, dbname=self.settings.dbname,
+            user=self.settings.user, password=self.settings.password, connect_timeout=10,
+            options='-c statement_timeout=10000',
+        ) as connection:
+            row = connection.execute(
+                """SELECT timestamp, calculation_id, machine_id, production_order,
+                          run_id, consumption_kg
+                   FROM material_consumption_snapshots
+                   WHERE calculation_id = %s AND machine_id = %s
+                     AND production_order = %s AND timestamp <= %s
+                   ORDER BY timestamp DESC
+                   LIMIT 1""",
+                (calculation_id, machine_id, production_order, timestamp),
+            ).fetchone()
+        return None if row is None else MaterialConsumptionSnapshot(*row)
+
+
 class PostgresMaterialSnapshotWriter:
     def __init__(self, settings: PostgresSettings) -> None:
         self.settings = settings

tests/test_context.py

@@ -0,0 +1,75 @@
+import pytest
+
+from production_analytics.context import (
+    build_enlyze_production_order,
+    extract_nominal_width_m,
+)
+
+K7_ORDER_TEMPLATE = "K 7-{production_order}"
+
+
+@pytest.mark.parametrize("order, expected", [
+    ("12026000815", "K 7-12026000815"),
+    (" \t12026000815\n", "K 7-12026000815"),
+    ("00123", "K 7-00123"),
+])
+def test_k7_mapping(order, expected):
+    assert build_enlyze_production_order(order, K7_ORDER_TEMPLATE) == expected
+
+
+@pytest.mark.parametrize("order", [
+    "", " \t", "K 7-12026000815", "K 7-12025000074-K 7-12025000075",
+    "12025000074-12025000075", "prefix12026000815", "12026000815suffix",
+    "12026 000815", "１２３", "-123",
+])
+def test_mapping_rejects_non_erp_identifiers(order):
+    with pytest.raises(ValueError, match="ERP production order"):
+        build_enlyze_production_order(order, K7_ORDER_TEMPLATE)
+
+
+@pytest.mark.parametrize("template, expected", [
+    ("EXAMPLE/{production_order}/finished", "EXAMPLE/00123/finished"),
+    ("{production_order}", "00123"),
+    ("{production_order}-example", "00123-example"),
+])
+def test_mapping_uses_explicit_template(template, expected):
+    assert build_enlyze_production_order(" 00123 ", template) == expected
+
+
+@pytest.mark.parametrize("template", [
+    "", "fixed-order", "{order}", "{production_order}-{production_order}",
+    "{production_order:>20}", "{production_order!r}", "{production_order}{unknown}",
+    "{{production_order}}",
+])
+def test_mapping_rejects_invalid_template(template):
+    with pytest.raises(ValueError, match="Format template"):
+        build_enlyze_production_order("12026000815", template)
+
+
+@pytest.mark.parametrize("description, expected", [
+    ("Stex R 1501  C (PR)   5,80 x  50 m", 5.8),
+    ("Stex R 401, 6,00 x 90 m", 6.0),
+    ("Stex R 1501 5.80 x 50 m", 5.8),
+    ("5,80x50 m", 5.8),
+    ("5,80x50m", 5.8),
+    ("Article 212520 grade 1501 5,80\t x\t50 m", 5.8),
+    ("5,80 x 50 m coated (batch 42)", 5.8),
+    ("(5,80 x 50 m), coated", 5.8),
+    ("6 x 90 m", 6.0),
+])
+def test_width(description, expected):
+    assert extract_nominal_width_m(description) == expected
+
+
+@pytest.mark.parametrize("description", [
+    None, "", "Stex R 1501", "5,80 m", "5,80 x 50", "5,80 x 50 cm",
+    "5,80 x 50 mm", "5,80 x 50 m²", "5,80 x 50 m2", "5,80 x 50 m/min",
+    "5,80 x 50 metres", "5,80,2 x 50 m", "5.80.2 x 50 m",
+    "5,80 x ? m", "5,80 x 50 m or 6,00 x 90 m", "2 x 5,80 x 50 m",
+    "5,80 x 50 m x 2", "0 x 50 m", "-5,80 x 50 m", "+5,80 x 50 m",
+    "nan x 50 m", "inf x 50 m", "Infinity x 50 m", "1e309 x 50 m",
+    "9" * 400 + " x 50 m", "5,80 x 0 m", "5,80 x -50 m", "5,80 x nan m",
+    "1/5,80 x 50 m", "abc5,80 x 50 m",
+])
+def test_width_fails_safely(description):
+    assert extract_nominal_width_m(description) is None

tests/test_material_efficiency.py

@@ -0,0 +1,184 @@
+from dataclasses import FrozenInstanceError, replace
+from datetime import UTC, datetime
+from unittest.mock import Mock
+from zoneinfo import ZoneInfo
+
+import pytest
+
+from production_analytics.erp import CurrentWorkplaceStatus
+from production_analytics.service.material_efficiency import MaterialEfficiencyService
+from production_analytics.service.postgres_material import MaterialConsumptionSnapshot
+
+CALC = 'k7-fiber-consumption'
+MACHINE = 'c220f95c-a65e-4cb7-99b7-0626d6c7508c'
+START = datetime(2026, 9, 4, 10, tzinfo=UTC)
+FEEDBACK = START.replace(minute=5)
+STATUS = CurrentWorkplaceStatus(
+    'K7', '12026000815', '212520', 'Stex R 1501 C (PR) 5,80 x 50 m',
+    FEEDBACK, None, 800, None, None, None,
+)
+MATERIAL = MaterialConsumptionSnapshot(START, CALC, MACHINE, 'K 7-12026000815', 'run', 1000)
+
+
+def service(repository=None, **config):
+    return MaterialEfficiencyService(
+        Mock(get_current_workplace_status=Mock(return_value=STATUS)),
+        repository if repository is not None else Mock(latest_at_or_before=Mock(
+            return_value=MATERIAL,
+        )),
+        **dict(workplace='K7', machine_id=MACHINE, calculation_id=CALC,
+               format_template='K 7-{production_order}', **config),
+    )
+
+
+def test_valid_current_feedback():
+    subject = service()
+    result = subject.evaluate_current()
+    assert result.material_consumption_kg_per_m2 == 1.25
+    assert result.material_consumption_g_per_m2 == 1250
+    assert result.nominal_width_m == 5.8
+    assert result.good_quantity_m2 == 800
+    assert result.material_consumption_kg == 1000
+    assert result.erp_feedback_timestamp == FEEDBACK
+    assert result.material_snapshot_timestamp == START
+    assert (result.workplace, result.machine_id, result.calculation_id) == ('K7', MACHINE, CALC)
+    assert (result.erp_production_order, result.enlyze_production_order) == (
+        '12026000815', 'K 7-12026000815',
+    )
+    assert (result.article_number, result.article_description) == (
+        STATUS.article_number, STATUS.article_description,
+    )
+    subject.erp.get_current_workplace_status.assert_called_once_with('K7')
+    subject.materials.latest_at_or_before.assert_called_once_with(
+        calculation_id=CALC, machine_id=MACHINE, production_order='K 7-12026000815',
+        timestamp=FEEDBACK,
+    )
+    with pytest.raises(FrozenInstanceError):
+        result.good_quantity_m2 = 5
+
+
+@pytest.mark.parametrize('quantity', [None, 0, -1, float('nan'), float('inf'), -float('inf')])
+def test_invalid_quantity(quantity):
+    subject = service()
+    assert subject.evaluate(replace(STATUS, good_quantity_m2=quantity)) is None
+    subject.materials.latest_at_or_before.assert_not_called()
+
+
+@pytest.mark.parametrize('description', [None, 'unstructured article'])
+def test_width_is_optional_context(description):
+    result = service().evaluate(replace(STATUS, article_description=description))
+    assert result.nominal_width_m is None
+    assert result.material_consumption_kg_per_m2 == 1.25
+
+
+def test_unavailable_sources():
+    subject = service()
+    subject.erp.get_current_workplace_status.return_value = None
+    assert subject.evaluate_current() is None
+    subject.materials.latest_at_or_before.return_value = None
+    assert subject.evaluate(STATUS) is None
+
+
+@pytest.mark.parametrize('consumption, quantity', [
+    (float('nan'), 800), (float('inf'), 800), (-1, 800),
+    (1e308, 1e-308), (1e308, 1),
+])
+def test_invalid_consumption_and_overflow(consumption, quantity):
+    subject = service()
+    subject.materials.latest_at_or_before.return_value = replace(
+        MATERIAL, consumption_kg=consumption,
+    )
+    assert subject.evaluate(replace(STATUS, good_quantity_m2=quantity)) is None
+
+
+def test_zero_consumption_is_valid():
+    subject = service()
+    subject.materials.latest_at_or_before.return_value = replace(MATERIAL, consumption_kg=0)
+    assert subject.evaluate(STATUS).material_consumption_kg_per_m2 == 0
+
+
+@pytest.mark.parametrize('changes', [
+    dict(timestamp=START.replace(minute=10)), dict(timestamp=START.replace(tzinfo=None)),
+    dict(production_order='K 7-12026000815-K 7-12026000816'),
+    dict(machine_id='other'), dict(calculation_id='other'),
+])
+def test_repository_contract_is_checked(changes):
+    subject = service()
+    subject.materials.latest_at_or_before.return_value = replace(MATERIAL, **changes)
+    with pytest.raises(ValueError, match='unaligned'):
+        subject.evaluate(STATUS)
+
+
+def test_other_explicit_configuration():
+    repository = Mock()
+    repository.latest_at_or_before.return_value = replace(
+        MATERIAL, machine_id='example-machine', production_order='ORDER/00123',
+    )
+    subject = MaterialEfficiencyService(
+        Mock(), repository, workplace='example', machine_id='example-machine',
+        calculation_id=CALC, format_template='ORDER/{production_order}',
+    )
+    result = subject.evaluate(replace(STATUS, workplace='example', production_order=' 00123 '))
+    assert result.enlyze_production_order == 'ORDER/00123'
+
+
+def test_wrong_workplace_and_combined_order_rejected():
+    with pytest.raises(ValueError, match='workplace'):
+        service().evaluate(replace(STATUS, workplace='other'))
+    with pytest.raises(ValueError, match='ERP production order'):
+        service().evaluate(replace(STATUS, production_order='K 7-123-K 7-456'))
+
+
+def test_temporal_regression_and_successive_feedback():
+    later = replace(
+        MATERIAL, timestamp=START.replace(minute=10), consumption_kg=1100, run_id='run2',
+    )
+    repository = Mock()
+    repository.latest_at_or_before.side_effect = lambda **kw: max(
+        (row for row in [MATERIAL, later] if row.timestamp <= kw['timestamp']),
+        key=lambda row: row.timestamp, default=None,
+    )
+    subject = service(repository)
+    first = subject.evaluate(STATUS)
+    second = subject.evaluate(replace(
+        STATUS, feedback_timestamp=later.timestamp, good_quantity_m2=1000,
+    ))
+    assert first.material_snapshot_timestamp == START
+    assert first.material_consumption_kg == 1000
+    assert first.material_consumption_kg_per_m2 == 1.25
+    assert second.material_snapshot_timestamp == later.timestamp
+    assert second.material_consumption_kg == 1100
+    assert second.material_consumption_kg_per_m2 == 1.1
+    assert first.good_quantity_m2 == 800
+
+
+def test_naive_feedback_requires_explicit_timezone_and_preserves_source():
+    naive = datetime(2026, 9, 4, 12, 5)
+    status = replace(STATUS, feedback_timestamp=naive)
+    with pytest.raises(ValueError, match='explicit erp_timezone'):
+        service().evaluate(status)
+    subject = service(erp_timezone=ZoneInfo('Europe/Berlin'))
+    result = subject.evaluate(status)
+    assert result.erp_feedback_timestamp == naive
+    assert subject.materials.latest_at_or_before.call_args.kwargs['timestamp'] == FEEDBACK
+
+
+@pytest.mark.parametrize('timestamp', [datetime(2026, 3, 29, 2, 30), datetime(2026, 10, 25, 2, 30)])
+def test_dst_gap_and_overlap_rejected(timestamp):
+    with pytest.raises(ValueError, match='ambiguous or nonexistent'):
+        service(erp_timezone=ZoneInfo('Europe/Berlin')).evaluate(
+            replace(STATUS, feedback_timestamp=timestamp),
+        )
+
+
+def test_aware_feedback_preserves_offset():
+    timestamp = FEEDBACK.astimezone(ZoneInfo('Europe/Berlin'))
+    result = service().evaluate(replace(STATUS, feedback_timestamp=timestamp))
+    assert result.erp_feedback_timestamp is timestamp
+
+
+def test_database_failure_propagates():
+    subject = service()
+    subject.materials.latest_at_or_before.side_effect = RuntimeError('unavailable')
+    with pytest.raises(RuntimeError, match='unavailable'):
+        subject.evaluate(STATUS)

tests/test_material_snapshot_repository.py

@@ -0,0 +1,101 @@
+import sqlite3
+import sys
+from datetime import UTC, datetime
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from production_analytics.service.postgres_material import (
+    PostgresMaterialSnapshotRepository,
+    PostgresSettings,
+)
+
+START = datetime(2026, 9, 4, 10, tzinfo=UTC)
+ORDER = " K 7-123'; -- "
+SETTINGS = PostgresSettings('localhost', 5432, 'analytics', 'reader', 'secret')
+
+
+@pytest.fixture
+def database():
+    # Execute the actual portable SELECT in SQLite; only adapt driver placeholders
+    # and datetime transport. This tests SQL semantics without a live PostgreSQL server.
+    with sqlite3.connect(':memory:') as database:
+        database.execute('''CREATE TABLE material_consumption_snapshots (
+            timestamp TEXT, calculation_id TEXT, machine_id TEXT, production_order TEXT,
+            run_id TEXT, consumption_kg REAL
+        )''')
+        rows = [
+            (START.isoformat(), 'calc', 'machine', ORDER, 'run1', 1000),
+            (START.replace(minute=10).isoformat(), 'calc', 'machine', ORDER, 'run2', 1100),
+            (START.replace(minute=4).isoformat(), 'other', 'machine', ORDER, 'run', 9999),
+            (START.replace(minute=4).isoformat(), 'calc', 'other', ORDER, 'run', 9999),
+            (START.replace(minute=4).isoformat(), 'calc', 'machine', ORDER.strip(), 'run', 9999),
+            (START.replace(minute=4).isoformat(), 'calc', 'machine', ORDER + '-other', 'run', 9999),
+        ]
+        database.executemany(
+            'INSERT INTO material_consumption_snapshots VALUES (?,?,?,?,?,?)', rows,
+        )
+        yield database
+
+
+@pytest.mark.parametrize('minute, expected_minute, consumption', [
+    (-1, None, None), (0, 0, 1000), (5, 0, 1000), (10, 10, 1100), (15, 10, 1100),
+])
+def test_aligned_lookup_sql(database, minute, expected_minute, consumption):
+    cutoff = START.replace(minute=minute) if minute >= 0 else START.replace(hour=9, minute=59)
+    driver = MagicMock()
+    connection = driver.connect.return_value.__enter__.return_value
+
+    def execute(sql, parameters):
+        assert parameters == ('calc', 'machine', ORDER, cutoff)
+        assert sql.count('%s') == 4
+        assert ORDER not in sql
+        assert 'ORDER BY timestamp DESC' in sql
+        assert 'LIMIT 1' in sql
+        row = database.execute(
+            sql.replace('%s', '?'), (*parameters[:3], parameters[3].isoformat()),
+        ).fetchone()
+        if row is not None:
+            row = (datetime.fromisoformat(row[0]), *row[1:])
+        return MagicMock(fetchone=MagicMock(return_value=row))
+
+    connection.execute.side_effect = execute
+    with patch.dict(sys.modules, psycopg=driver):
+        result = PostgresMaterialSnapshotRepository(SETTINGS).latest_at_or_before(
+            calculation_id='calc', machine_id='machine', production_order=ORDER, timestamp=cutoff,
+        )
+    if expected_minute is None:
+        assert result is None
+    else:
+        assert result.timestamp == START.replace(minute=expected_minute)
+        assert result.timestamp <= cutoff
+        assert result.consumption_kg == consumption
+        assert (result.calculation_id, result.machine_id, result.production_order) == (
+            'calc', 'machine', ORDER,
+        )
+        assert result.run_id == ('run1' if expected_minute == 0 else 'run2')
+    connection.execute.assert_called_once()
+    driver.connect.assert_called_once_with(
+        host='localhost', port=5432, dbname='analytics', user='reader', password='secret',
+        connect_timeout=10, options='-c statement_timeout=10000',
+    )
+    driver.connect.return_value.__exit__.assert_called_once_with(None, None, None)
+
+
+def test_naive_cutoff_rejected_before_connection():
+    driver = MagicMock()
+    with patch.dict(sys.modules, psycopg=driver), pytest.raises(ValueError, match='timezone-aware'):
+        PostgresMaterialSnapshotRepository(SETTINGS).latest_at_or_before(
+            calculation_id='calc', machine_id='machine', production_order=ORDER,
+            timestamp=START.replace(tzinfo=None),
+        )
+    driver.connect.assert_not_called()
+
+
+def test_database_failure_propagates():
+    driver = MagicMock()
+    driver.connect.side_effect = RuntimeError('connection unavailable')
+    with patch.dict(sys.modules, psycopg=driver), pytest.raises(RuntimeError):
+        PostgresMaterialSnapshotRepository(SETTINGS).latest_at_or_before(
+            calculation_id='calc', machine_id='machine', production_order=ORDER, timestamp=START,
+        )