feat(logs): Maschinenstunden pro Reisetag und Verbrauch pro Stunde

Maschinenstunden sind im Journal erfassbar; der Kraftstoffverbrauch pro Maschinenstunde wird aus Tagesverbrauch und Maschinenstunden berechnet und in Journal sowie Statistik als Read-only angezeigt.

Co-authored-by: Cursor <cursoragent@cursor.com>

client/src/App.css

@@ -2660,6 +2660,13 @@ html.theme-cupertino .events-scroll-container {
   color: var(--app-text-muted);
 }
 
+.stats-section-subtitle {
+  margin: 0 0 12px;
+  font-size: 14px;
+  font-weight: 600;
+  color: var(--app-text-primary);
+}
+
 .stats-route-chain {
   margin: 0;
   font-size: 15px;
@@ -2762,6 +2769,14 @@ html.theme-cupertino .events-scroll-container {
   background: linear-gradient(180deg, #38bdf8, #0284c7);
 }
 
+.stats-bar--motor-hours {
+  background: linear-gradient(180deg, #a78bfa, #7c3aed);
+}
+
+.stats-bar--fuel-per-hour {
+  background: linear-gradient(180deg, #fb923c, #ea580c);
+}
+
 .stats-bar-label {
   margin-top: 8px;
   font-size: 11px;

client/src/components/LogEntryEditor.tsx

@@ -37,6 +37,7 @@ import {
   type SavedTrack
 } from '../services/trackUpload.js'
 import { computeTrackStats, formatTrackStats } from '../utils/trackStats.js'
+import { computeFuelPerMotorHour, formatFuelPerMotorHour } from '../utils/fuelStats.js'
 import { useRegisterUnsavedChanges } from '../context/UnsavedChangesContext.tsx'
 
 function emptyTankLevels() {
@@ -49,6 +50,7 @@ function fingerprintFromStoredEntry(decrypted: Record<string, unknown>): string
   const trackDistance = decrypted.trackDistanceNm
   const trackSpeedMax = decrypted.trackSpeedMaxKn
   const trackSpeedAvg = decrypted.trackSpeedAvgKn
+  const motorHoursRaw = decrypted.motorHours
 
   const payload = buildLogEntryPayload({
     date: String(decrypted.date || ''),
@@ -79,6 +81,10 @@ function fingerprintFromStoredEntry(decrypted: Record<string, unknown>): string
       trackSpeedAvg != null && trackSpeedAvg !== ''
         ? parseFloat(String(trackSpeedAvg))
         : undefined,
+    motorHours:
+      motorHoursRaw != null && motorHoursRaw !== ''
+        ? parseFloat(String(motorHoursRaw))
+        : undefined,
     events: (decrypted.events as LogEventPayload[]) || []
   })
 
@@ -149,6 +155,9 @@ export default function LogEntryEditor({
   const [trackSpeedMaxKn, setTrackSpeedMaxKn] = useState('')
   const [trackSpeedAvgKn, setTrackSpeedAvgKn] = useState('')
 
+  // Motor hours under engine propulsion (per travel day)
+  const [motorHours, setMotorHours] = useState('')
+
   // Events list state
   const [events, setEvents] = useState<LogEvent[]>([])
 
@@ -209,6 +218,11 @@ export default function LogEntryEditor({
     if (entry?.trackSpeedAvgKn != null && entry.trackSpeedAvgKn !== '') {
       setTrackSpeedAvgKn(String(entry.trackSpeedAvgKn))
     }
+    if (entry?.motorHours != null && entry.motorHours !== '') {
+      setMotorHours(String(entry.motorHours))
+    } else {
+      setMotorHours('')
+    }
   }
 
   const buildPayloadForSigning = useCallback((eventsOverride?: LogEvent[]) => {
@@ -232,16 +246,22 @@ export default function LogEntryEditor({
       trackDistanceNm: trackDistanceNm.trim() ? parseFloat(trackDistanceNm) : undefined,
       trackSpeedMaxKn: trackSpeedMaxKn.trim() ? parseFloat(trackSpeedMaxKn) : undefined,
       trackSpeedAvgKn: trackSpeedAvgKn.trim() ? parseFloat(trackSpeedAvgKn) : undefined,
+      motorHours: motorHours.trim() ? parseFloat(motorHours) : undefined,
       events: eventsOverride ?? events
     })
   }, [
     date, dayOfTravel, departure, destination,
     fwMorning, fwRefilled, fwEvening, fwConsumption,
     fuelMorning, fuelRefilled, fuelEvening, fuelConsumption,
-    trackDistanceNm, trackSpeedMaxKn, trackSpeedAvgKn,
+    trackDistanceNm, trackSpeedMaxKn, trackSpeedAvgKn, motorHours,
     events
   ])
 
+  const fuelPerMotorHour = useMemo(
+    () => computeFuelPerMotorHour(parseFloat(fuelConsumption) || 0, parseFloat(motorHours) || 0),
+    [fuelConsumption, motorHours]
+  )
+
   const currentFingerprint = useMemo(() => {
     const payload = buildPayloadForSigning()
     return JSON.stringify({
@@ -1109,6 +1129,20 @@ export default function LogEntryEditor({
                 disabled={saving || readOnly}
               />
             </div>
+
+            <div className="input-group">
+              <label>{t('logs.motor_hours')}</label>
+              <input
+                type="number"
+                className="input-text"
+                value={motorHours}
+                onChange={(e) => setMotorHours(e.target.value)}
+                disabled={saving || readOnly}
+                min="0"
+                step="0.1"
+                placeholder="0"
+              />
+            </div>
           </div>
         </div>
 
@@ -1219,6 +1253,22 @@ export default function LogEntryEditor({
                   aria-readonly="true"
                 />
               </div>
+
+              <div className="input-group">
+                <label>{t('logs.fuel_per_motor_hour')}</label>
+                <input
+                  type="text"
+                  className="input-text consumption-value"
+                  value={
+                    fuelPerMotorHour != null
+                      ? `${formatFuelPerMotorHour(fuelPerMotorHour)} L/h`
+                      : '—'
+                  }
+                  readOnly
+                  tabIndex={-1}
+                  aria-readonly="true"
+                />
+              </div>
             </div>
           </div>
         </div>

client/src/components/StatsDashboard.tsx

@@ -1,9 +1,10 @@
 import { useCallback, useEffect, useMemo, useState, type ReactNode } from 'react'
 import { useTranslation } from 'react-i18next'
-import { BarChart2, Anchor, Droplets, Fuel, Sailboat, Gauge } from 'lucide-react'
+import { BarChart2, Anchor, Droplets, Fuel, Sailboat, Gauge, Timer } from 'lucide-react'
 import MultiTrackMap from './MultiTrackMap.tsx'
 import {
   formatLiters,
+  formatHours,
   formatNm,
   loadAccountStats,
   loadLogbookStats,
@@ -12,6 +13,7 @@ import {
   type TravelDayStats
 } from '../services/statsAggregation.js'
 import { compareTravelDaysChronological } from '../utils/logEntryTankLevels.js'
+import { formatFuelPerMotorHour } from '../utils/fuelStats.js'
 
 interface StatsDashboardProps {
   logbookId: string
@@ -78,12 +80,26 @@ function TotalsGrid({ totals }: { totals: StatsTotals }) {
         value={formatNm(totals.motorDistanceNm)}
         unit={t('stats.unit_nm')}
       />
+      <KpiCard
+        icon={<Timer size={20} />}
+        label={t('stats.motor_hours_total')}
+        value={formatHours(totals.totalMotorHours)}
+        unit={t('stats.unit_h')}
+      />
       <KpiCard
         icon={<Fuel size={20} />}
         label={t('stats.fuel_total')}
         value={formatLiters(totals.totalFuelL)}
         unit={t('stats.unit_l')}
       />
+      {totals.fuelPerMotorHourL != null && (
+        <KpiCard
+          icon={<Timer size={20} />}
+          label={t('stats.fuel_per_motor_hour')}
+          value={formatFuelPerMotorHour(totals.fuelPerMotorHourL)}
+          unit={`${t('stats.unit_l')}/${t('stats.unit_h')}`}
+        />
+      )}
       <KpiCard
         icon={<Droplets size={20} />}
         label={t('stats.water_total')}
@@ -247,6 +263,36 @@ function LogbookScopeView({ summary }: { summary: LogbookStatsSummary }) {
         />
       </div>
 
+      <div className="member-editor-card glass mt-6">
+        <h3 className="stats-section-title">{t('stats.daily_motor_hours')}</h3>
+        <p className="stats-section-sub">
+          {t('stats.avg_motor_hours')}: {formatHours(totals.avgMotorHoursPerDay)} {t('stats.unit_h')}
+          {totals.fuelPerMotorHourL != null && (
+            <>
+              {' · '}
+              {t('stats.fuel_per_motor_hour')}: {formatFuelPerMotorHour(totals.fuelPerMotorHourL)} {t('stats.unit_l')}/{t('stats.unit_h')}
+            </>
+          )}
+        </p>
+        <DailyBarChart
+          days={travelDays}
+          valueFn={(d) => d.motorHours}
+          barClass="stats-bar--motor-hours"
+          formatValue={formatHours}
+        />
+        {travelDays.some((d) => d.fuelPerMotorHourL != null) && (
+          <>
+            <h4 className="stats-section-subtitle mt-4">{t('stats.daily_fuel_per_motor_hour')}</h4>
+            <DailyBarChart
+              days={travelDays}
+              valueFn={(d) => d.fuelPerMotorHourL ?? 0}
+              barClass="stats-bar--fuel-per-hour"
+              formatValue={(v) => formatFuelPerMotorHour(v > 0 ? v : null)}
+            />
+          </>
+        )}
+      </div>
+
       <div className="member-editor-card glass mt-6">
         <h3 className="stats-section-title">{t('stats.daily_consumption')}</h3>
         <p className="stats-section-sub">
@@ -256,6 +302,9 @@ function LogbookScopeView({ summary }: { summary: LogbookStatsSummary }) {
           {totals.fuelPerNmL != null && (
             <> · {t('stats.fuel_per_nm')}: {totals.fuelPerNmL} {t('stats.unit_l')}/{t('stats.unit_nm')}</>
           )}
+          {totals.fuelPerMotorHourL != null && (
+            <> · {t('stats.fuel_per_motor_hour')}: {formatFuelPerMotorHour(totals.fuelPerMotorHourL)} {t('stats.unit_l')}/{t('stats.unit_h')}</>
+          )}
         </p>
         <ConsumptionChart days={travelDays} />
       </div>
@@ -367,6 +416,7 @@ export default function StatsDashboard({ logbookId, logbookTitle }: StatsDashboa
                         <th>{t('stats.travel_days')}</th>
                         <th>{t('stats.total_distance')}</th>
                         <th>{t('stats.fuel_total')}</th>
+                        <th>{t('stats.motor_hours_total')}</th>
                         <th>{t('stats.water_total')}</th>
                       </tr>
                     </thead>
@@ -377,6 +427,7 @@ export default function StatsDashboard({ logbookId, logbookTitle }: StatsDashboa
                           <td>{lb.totals.travelDayCount}</td>
                           <td>{formatNm(lb.totals.totalDistanceNm)} {t('stats.unit_nm')}</td>
                           <td>{formatLiters(lb.totals.totalFuelL)} {t('stats.unit_l')}</td>
+                          <td>{formatHours(lb.totals.totalMotorHours)} {t('stats.unit_h')}</td>
                           <td>{formatLiters(lb.totals.totalFreshwaterL)} {t('stats.unit_l')}</td>
                         </tr>
                       ))}
@@ -397,8 +448,39 @@ export default function StatsDashboard({ logbookId, logbookTitle }: StatsDashboa
                     />
                   </div>
 
+                  <div className="member-editor-card glass mt-6">
+                    <h3 className="stats-section-title">{t('stats.daily_motor_hours')}</h3>
+                    {accountStats.totals.fuelPerMotorHourL != null && (
+                      <p className="stats-section-sub">
+                        {t('stats.fuel_per_motor_hour')}: {formatFuelPerMotorHour(accountStats.totals.fuelPerMotorHourL)} {t('stats.unit_l')}/{t('stats.unit_h')}
+                      </p>
+                    )}
+                    <DailyBarChart
+                      days={allAccountDays}
+                      valueFn={(d) => d.motorHours}
+                      barClass="stats-bar--motor-hours"
+                      formatValue={formatHours}
+                    />
+                    {allAccountDays.some((d) => d.fuelPerMotorHourL != null) && (
+                      <>
+                        <h4 className="stats-section-subtitle mt-4">{t('stats.daily_fuel_per_motor_hour')}</h4>
+                        <DailyBarChart
+                          days={allAccountDays}
+                          valueFn={(d) => d.fuelPerMotorHourL ?? 0}
+                          barClass="stats-bar--fuel-per-hour"
+                          formatValue={(v) => formatFuelPerMotorHour(v > 0 ? v : null)}
+                        />
+                      </>
+                    )}
+                  </div>
+
                   <div className="member-editor-card glass mt-6">
                     <h3 className="stats-section-title">{t('stats.daily_consumption')}</h3>
+                    {accountStats.totals.fuelPerMotorHourL != null && (
+                      <p className="stats-section-sub">
+                        {t('stats.fuel_per_motor_hour')}: {formatFuelPerMotorHour(accountStats.totals.fuelPerMotorHourL)} {t('stats.unit_l')}/{t('stats.unit_h')}
+                      </p>
+                    )}
                     <ConsumptionChart days={allAccountDays} />
                   </div>
 

client/src/i18n/locales/de.json

@@ -205,6 +205,8 @@
       "event_heel": "Krängung (°)",
       "event_sails": "Segelführung / Motor",
       "motor_propulsion": "Maschinenfahrt",
+      "motor_hours": "Maschinenstunden (gesamt)",
+      "fuel_per_motor_hour": "Verbrauch pro Maschinenstunde",
       "event_distance": "Distanz (sm)",
       "export_csv": "CSV herunterladen",
       "share_csv": "CSV teilen",
@@ -479,6 +481,9 @@
       "travel_days": "Reisetage",
       "sail_distance": "Unter Segel",
       "motor_distance": "Maschinenfahrt",
+      "motor_hours_total": "Maschinenstunden gesamt",
+      "daily_motor_hours": "Maschinenstunden pro Reisetag",
+      "avg_motor_hours": "Ø Maschinenstunden pro Reisetag",
       "unknown_propulsion": "Unbekannt",
       "fuel_total": "Kraftstoff gesamt",
       "water_total": "Wasser gesamt",
@@ -492,9 +497,12 @@
       "avg_fuel": "Ø Kraftstoff",
       "avg_water": "Ø Wasser",
       "fuel_per_nm": "Kraftstoff pro sm",
+      "fuel_per_motor_hour": "Kraftstoff pro Maschinenstunde",
+      "daily_fuel_per_motor_hour": "Kraftstoffverbrauch pro Maschinenstunde je Reisetag",
       "fuel_legend": "Kraftstoff",
       "water_legend": "Wasser",
       "unit_nm": "sm",
+      "unit_h": "h",
       "unit_l": "L",
       "day_label": "Tag {{day}}",
       "account_logbooks": "Logbücher im Überblick",

client/src/i18n/locales/en.json

@@ -205,6 +205,8 @@
       "event_heel": "Heel Angle (°)",
       "event_sails": "Sails / Motor Status",
       "motor_propulsion": "Engine Propulsion",
+      "motor_hours": "Engine hours (total)",
+      "fuel_per_motor_hour": "Consumption per engine hour",
       "event_distance": "Distance (nm)",
       "export_csv": "Download CSV",
       "share_csv": "Share CSV",
@@ -479,6 +481,9 @@
       "travel_days": "Travel days",
       "sail_distance": "Under sail",
       "motor_distance": "Engine",
+      "motor_hours_total": "Total engine hours",
+      "daily_motor_hours": "Engine hours per travel day",
+      "avg_motor_hours": "Avg. engine hours per travel day",
       "unknown_propulsion": "Unknown",
       "fuel_total": "Total fuel",
       "water_total": "Total water",
@@ -492,9 +497,12 @@
       "avg_fuel": "Avg. fuel",
       "avg_water": "Avg. water",
       "fuel_per_nm": "Fuel per nm",
+      "fuel_per_motor_hour": "Fuel per engine hour",
+      "daily_fuel_per_motor_hour": "Fuel consumption per engine hour by travel day",
       "fuel_legend": "Fuel",
       "water_legend": "Water",
       "unit_nm": "nm",
+      "unit_h": "h",
       "unit_l": "L",
       "day_label": "Day {{day}}",
       "account_logbooks": "Logbooks overview",

client/src/services/csvExport.ts

@@ -80,7 +80,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
   const headers = [
     'Date', 'Day of Travel', 'Departure Port', 'Destination Port',
     'Skipper Signature', 'Crew Signature',
-    'Track Distance (nm)', 'Track Max Speed (kn)', 'Track Avg Speed (kn)',
+    'Track Distance (nm)', 'Track Max Speed (kn)', 'Track Avg Speed (kn)', 'Motor Hours (h)',
     'Event Time', 'MgK Course', 'RwK Course',
     'Wind Dir', 'Wind Str', 'Barometer (hPa)', 'Sea State',
     'Current', 'Heel Angle', 'Sails/Motor', 'Log (nm)', 'Distance (nm)',
@@ -113,6 +113,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
     const trackDist = entry.trackDistanceNm ?? '';
     const trackMax = entry.trackSpeedMaxKn ?? '';
     const trackAvg = entry.trackSpeedAvgKn ?? '';
+    const motorH = entry.motorHours ?? '';
     const fwM = entry.freshwater?.morning ?? '';
     const fwR = entry.freshwater?.refilled ?? '';
     const fwE = entry.freshwater?.evening ?? '';
@@ -128,7 +129,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
       rows.push([
         dateVal, travelDay, dep, dest,
         signS, signC,
-        trackDist, trackMax, trackAvg,
+        trackDist, trackMax, trackAvg, motorH,
         '', '', '',
         '', '', '', '',
         '', '', '', '', '',
@@ -144,7 +145,7 @@ export async function exportLogbookToCsv(logbookId: string, preloadedData?: { ya
         rows.push([
           dateVal, travelDay, dep, dest,
           signS, signC,
-          trackDist, trackMax, trackAvg,
+          trackDist, trackMax, trackAvg, motorH,
           ev.time || '', ev.mgk || '', ev.rwk || '',
           ev.windDirection || '', ev.windStrength || '', ev.windPressure || '', ev.seaState || '',
           ev.current || '', ev.heel || '', ev.sailsOrMotor || '', ev.logReading || '', ev.distance || '',

client/src/services/demoLogbookData.ts

@@ -26,6 +26,7 @@ export interface DemoDaySpec {
   filename: string
   freshwater: { morning: number; refilled: number; evening: number; consumption: number }
   fuel: { morning: number; refilled: number; evening: number; consumption: number }
+  motorHours?: number
   events: Array<Record<string, string>>
 }
 
@@ -100,6 +101,7 @@ export function buildDemoDays(): DemoDaySpec[] {
       filename: 'laboe-damp.gpx',
       freshwater: { morning: 105, refilled: 25, evening: 110, consumption: 20 },
       fuel: { morning: 78, refilled: 0, evening: 70, consumption: 8 },
+      motorHours: 1.5,
       events: [
         {
           time: '09:00',
@@ -247,6 +249,9 @@ export function buildPublicDemoFixture(): PublicDemoFixture {
       entryPayload.trackSpeedMaxKn = stats.speedMaxKn
       entryPayload.trackSpeedAvgKn = stats.speedAvgKn
     }
+    if (day.motorHours != null && day.motorHours > 0) {
+      entryPayload.motorHours = day.motorHours
+    }
 
     entries.push(entryPayload as PublicDemoFixture['entries'][number])
 
@@ -303,6 +308,9 @@ export function buildDemoEntryPayloads(): Array<{
       entryPayload.trackSpeedMaxKn = stats.speedMaxKn
       entryPayload.trackSpeedAvgKn = stats.speedAvgKn
     }
+    if (day.motorHours != null && day.motorHours > 0) {
+      entryPayload.motorHours = day.motorHours
+    }
 
     return {
       entryId,

client/src/services/statsAggregation.ts

@@ -10,6 +10,7 @@ import {
   parseEventDistanceNm,
   splitDistanceByPropulsion
 } from '../utils/propulsionStats.js'
+import { computeFuelPerMotorHour } from '../utils/fuelStats.js'
 
 export type DistanceSource = 'gps' | 'events' | 'none'
 
@@ -27,6 +28,8 @@ export interface TravelDayStats {
   sailDistanceNm: number
   motorDistanceNm: number
   unknownPropulsionNm: number
+  motorHours: number
+  fuelPerMotorHourL: number | null
   hasGpsTrack: boolean
 }
 
@@ -59,12 +62,15 @@ export interface StatsTotals {
   sailDistanceNm: number
   motorDistanceNm: number
   unknownPropulsionNm: number
+  totalMotorHours: number
   totalFuelL: number
   totalFreshwaterL: number
   avgDistancePerDayNm: number
+  avgMotorHoursPerDay: number
   avgFuelPerDayL: number
   avgFreshwaterPerDayL: number
   fuelPerNmL: number | null
+  fuelPerMotorHourL: number | null
 }
 
 const TRACK_COLORS = [
@@ -102,6 +108,7 @@ function buildTotals(days: TravelDayStats[]): StatsTotals {
   const sailDistanceNm = days.reduce((sum, d) => sum + d.sailDistanceNm, 0)
   const motorDistanceNm = days.reduce((sum, d) => sum + d.motorDistanceNm, 0)
   const unknownPropulsionNm = days.reduce((sum, d) => sum + d.unknownPropulsionNm, 0)
+  const totalMotorHours = days.reduce((sum, d) => sum + d.motorHours, 0)
   const totalFuelL = days.reduce((sum, d) => sum + d.fuelConsumptionL, 0)
   const totalFreshwaterL = days.reduce((sum, d) => sum + d.freshwaterConsumptionL, 0)
 
@@ -112,10 +119,13 @@ function buildTotals(days: TravelDayStats[]): StatsTotals {
     sailDistanceNm: Number(sailDistanceNm.toFixed(2)),
     motorDistanceNm: Number(motorDistanceNm.toFixed(2)),
     unknownPropulsionNm: Number(unknownPropulsionNm.toFixed(2)),
+    totalMotorHours: Number(totalMotorHours.toFixed(1)),
     totalFuelL: Number(totalFuelL.toFixed(1)),
     totalFreshwaterL: Number(totalFreshwaterL.toFixed(1)),
     avgDistancePerDayNm:
       travelDayCount > 0 ? Number((totalDistanceNm / travelDayCount).toFixed(2)) : 0,
+    avgMotorHoursPerDay:
+      travelDayCount > 0 ? Number((totalMotorHours / travelDayCount).toFixed(1)) : 0,
     avgFuelPerDayL:
       travelDayCount > 0 ? Number((totalFuelL / travelDayCount).toFixed(1)) : 0,
     avgFreshwaterPerDayL:
@@ -123,7 +133,8 @@ function buildTotals(days: TravelDayStats[]): StatsTotals {
     fuelPerNmL:
       totalDistanceNm > 0 && totalFuelL > 0
         ? Number((totalFuelL / totalDistanceNm).toFixed(2))
-        : null
+        : null,
+    fuelPerMotorHourL: computeFuelPerMotorHour(totalFuelL, totalMotorHours)
   }
 }
 
@@ -180,6 +191,9 @@ async function loadTravelDaysForLogbook(
       hasGpsTrack = !!(await db.gpsTracks.get(entry.payloadId))
     }
 
+    const fuelConsumptionL = Number(payload.fuel?.consumption) || 0
+    const motorHours = Number(payload.motorHours) || 0
+
     days.push({
       entryId: entry.payloadId,
       logbookId,
@@ -189,11 +203,13 @@ async function loadTravelDaysForLogbook(
       destination: payload.destination || '',
       distanceNm,
       distanceSource,
-      fuelConsumptionL: Number(payload.fuel?.consumption) || 0,
+      fuelConsumptionL,
       freshwaterConsumptionL: Number(payload.freshwater?.consumption) || 0,
       sailDistanceNm: propulsion.sailDistanceNm,
       motorDistanceNm: propulsion.motorDistanceNm,
       unknownPropulsionNm: propulsion.unknownPropulsionNm,
+      motorHours,
+      fuelPerMotorHourL: computeFuelPerMotorHour(fuelConsumptionL, motorHours),
       hasGpsTrack
     })
   }
@@ -249,3 +265,7 @@ export function formatNm(value: number): string {
 export function formatLiters(value: number): string {
   return Number.isInteger(value) ? String(value) : value.toFixed(1)
 }
+
+export function formatHours(value: number): string {
+  return Number.isInteger(value) ? String(value) : value.toFixed(1)
+}

client/src/utils/fuelStats.ts

@@ -0,0 +1,13 @@
+/** Liters per motor hour from daily fuel consumption and motor hours. */
+export function computeFuelPerMotorHour(
+  fuelConsumptionL: number,
+  motorHours: number
+): number | null {
+  if (motorHours <= 0) return null
+  return Number((fuelConsumptionL / motorHours).toFixed(2))
+}
+
+export function formatFuelPerMotorHour(value: number | null | undefined): string {
+  if (value == null) return '—'
+  return Number.isInteger(value) ? String(value) : value.toFixed(2)
+}

client/src/utils/logEntryPayload.ts

@@ -71,6 +71,7 @@ export interface LogEntryPayloadInput {
   trackDistanceNm?: number
   trackSpeedMaxKn?: number
   trackSpeedAvgKn?: number
+  motorHours?: number
   events: LogEventPayload[]
 }
 
@@ -88,6 +89,9 @@ export function buildLogEntryPayload(input: LogEntryPayloadInput): Record<string
   if (input.trackDistanceNm !== undefined) payload.trackDistanceNm = input.trackDistanceNm
   if (input.trackSpeedMaxKn !== undefined) payload.trackSpeedMaxKn = input.trackSpeedMaxKn
   if (input.trackSpeedAvgKn !== undefined) payload.trackSpeedAvgKn = input.trackSpeedAvgKn
+  if (input.motorHours !== undefined && input.motorHours > 0) {
+    payload.motorHours = Number(input.motorHours.toFixed(2))
+  }
 
   return payload
 }