Add dashboard historian persistence

src/main/java/com/litoralregas/backend/acquisition/scheduler/AcquisitionSchedulerService.java

@@ -2,6 +2,7 @@ package com.litoralregas.backend.acquisition.scheduler;
 
 import com.litoralregas.backend.acquisition.polling.AcquisitionPollResult;
 import com.litoralregas.backend.acquisition.block.BlockPollingService;
+import com.litoralregas.backend.websocket.dashboard.DashboardOverviewWebSocketPublisher;
 import com.litoralregas.backend.websocket.telemetry.TelemetryWebSocketPublisher;
 import jakarta.annotation.PostConstruct;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -18,6 +19,7 @@ public class AcquisitionSchedulerService {
     private final AcquisitionSchedulerProperties properties;
     private final TaskScheduler taskScheduler;
     private final TelemetryWebSocketPublisher telemetryWebSocketPublisher;
+    private final DashboardOverviewWebSocketPublisher dashboardOverviewWebSocketPublisher;
 
     private final AcquisitionRuntimeStatus runtimeStatus = new AcquisitionRuntimeStatus();
 
@@ -27,12 +29,14 @@ public class AcquisitionSchedulerService {
             BlockPollingService blockPollingService,
             AcquisitionSchedulerProperties properties,
             @Qualifier("acquisitionTaskScheduler") TaskScheduler taskScheduler,
-            TelemetryWebSocketPublisher telemetryWebSocketPublisher
+            TelemetryWebSocketPublisher telemetryWebSocketPublisher,
+            DashboardOverviewWebSocketPublisher dashboardOverviewWebSocketPublisher
     ) {
         this.blockPollingService = blockPollingService;
         this.properties = properties;
         this.taskScheduler = taskScheduler;
         this.telemetryWebSocketPublisher = telemetryWebSocketPublisher;
+        this.dashboardOverviewWebSocketPublisher = dashboardOverviewWebSocketPublisher;
     }
 
     @PostConstruct
@@ -71,6 +75,7 @@ public class AcquisitionSchedulerService {
             runtimeStatus.setLastFailedReads(result.failedReads());
 
             telemetryWebSocketPublisher.publishLatestTelemetry();
+            dashboardOverviewWebSocketPublisher.publishOverview();
 
         } catch (Exception exception) {
             runtimeStatus.setLastError(exception.getMessage());

src/main/java/com/litoralregas/backend/dashboard/DashboardController.java

@@ -0,0 +1,19 @@
+package com.litoralregas.backend.dashboard;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class DashboardController {
+
+    private final DashboardOverviewService dashboardOverviewService;
+
+    public DashboardController(DashboardOverviewService dashboardOverviewService) {
+        this.dashboardOverviewService = dashboardOverviewService;
+    }
+
+    @GetMapping("/api/dashboard/overview")
+    public DashboardOverviewResponse getOverview() {
+        return dashboardOverviewService.getOverview();
+    }
+}

src/main/java/com/litoralregas/backend/dashboard/DashboardOverviewResponse.java

@@ -0,0 +1,50 @@
+package com.litoralregas.backend.dashboard;
+
+import java.time.Instant;
+import java.util.List;
+
+public record DashboardOverviewResponse(
+        Instant timestamp,
+        MeteoOverview meteo,
+        ClimateOverview climate,
+        IrrigationOverview irrigation,
+        LightingOverview lighting
+) {
+    public record MeteoOverview(
+            Double exteriorTemperature,
+            Double exteriorHumidity,
+            Double radiation,
+            Double windSpeed,
+            Double windDirection,
+            Boolean raining
+    ) {}
+
+    public record ClimateOverview(
+            Integer zoneCount,
+            List<ClimateZoneOverview> zones
+    ) {}
+
+    public record ClimateZoneOverview(
+            Integer zoneNumber,
+            Double temperature,
+            Double humidity,
+            Double co2,
+            Boolean fansOn,
+            Boolean extractorsOn,
+            Double zenitalLeftPercent,
+            Double zenitalRightPercent,
+            Double lateralLeftPercent,
+            Double lateralRightPercent
+    ) {}
+
+    public record IrrigationOverview(
+            Integer controllerCount,
+            Integer activeValveCount,
+            Integer activePumpCount
+    ) {}
+
+    public record LightingOverview(
+            Integer sectorCount,
+            Integer activeSectorCount
+    ) {}
+}

src/main/java/com/litoralregas/backend/dashboard/DashboardOverviewService.java

@@ -0,0 +1,286 @@
+package com.litoralregas.backend.dashboard;
+
+import com.litoralregas.backend.acquisition.telemetry.TelemetryCache;
+import com.litoralregas.backend.acquisition.telemetry.TelemetrySnapshot;
+import org.springframework.stereotype.Service;
+
+import java.time.Instant;
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class DashboardOverviewService {
+
+    private final TelemetryCache telemetryCache;
+
+    public DashboardOverviewService(TelemetryCache telemetryCache) {
+        this.telemetryCache = telemetryCache;
+    }
+
+    public DashboardOverviewResponse getOverview() {
+        Collection<TelemetrySnapshot> snapshots = telemetryCache.getAll();
+        System.out.println("DashboardOverview snapshot count = " + snapshots.size());
+
+        snapshots.stream()
+                .limit(20)
+                .forEach(snapshot ->
+                        System.out.println(
+                                snapshot.sensorId() + " | " +
+                                        snapshot.name() + " | " +
+                                        snapshot.modbusAddress() + " | " +
+                                        snapshot.value()
+                        )
+                );
+        return new DashboardOverviewResponse(
+                Instant.now(),
+                buildMeteo(snapshots),
+                buildClimate(snapshots),
+                buildIrrigation(snapshots),
+                buildLighting(snapshots)
+        );
+    }
+
+    private DashboardOverviewResponse.MeteoOverview buildMeteo(
+            Collection<TelemetrySnapshot> snapshots
+    ) {
+        return new DashboardOverviewResponse.MeteoOverview(
+                numberByNameContains(snapshots, "Temperatura exterior"),
+                numberByNameContains(snapshots, "Humidade exterior"),
+                numberByNameContains(snapshots, "Radiacao"),
+                numberByNameContains(snapshots, "Velocidade Vento"),
+                numberByNameContains(snapshots, "Direcao Vento"),
+                booleanByNameContains(snapshots, "Chuva")
+        );
+    }
+
+    private DashboardOverviewResponse.ClimateOverview buildClimate(Collection<TelemetrySnapshot> snapshots) {
+        List<DashboardOverviewResponse.ClimateZoneOverview> zones =
+                java.util.stream.IntStream.rangeClosed(1, 6)
+                        .mapToObj(zone -> buildClimateZone(snapshots, zone))
+                        .toList();
+
+        return new DashboardOverviewResponse.ClimateOverview(
+                zones.size(),
+                zones
+        );
+    }
+
+    private DashboardOverviewResponse.ClimateZoneOverview buildClimateZone(
+            Collection<TelemetrySnapshot> snapshots,
+            int zone
+    ) {
+        int base = 100 + ((zone - 1) * 40);
+
+        return new DashboardOverviewResponse.ClimateZoneOverview(
+                zone,
+
+                validTemperature(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base,
+                                "Temperatura estufa " + zone
+                        )
+                ),
+
+                validHumidity(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 1,
+                                "Humidade estufa " + zone
+                        )
+                ),
+
+                validCo2(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 12,
+                                "CO2 estufa " + zone
+                        )
+                ),
+
+                booleanByAddressAndBit(snapshots, base + 15, 0),
+                booleanByAddressAndBit(snapshots, base + 15, 1),
+
+                validPercent(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 16,
+                                "Zenital E E" + zone
+                        )
+                ),
+
+                validPercent(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 17,
+                                "Zenital D E" + zone
+                        )
+                ),
+
+                validPercent(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 18,
+                                "Lateral E E" + zone
+                        )
+                ),
+
+                validPercent(
+                        numberByAddressAndNameContains(
+                                snapshots,
+                                base + 19,
+                                "Lateral D E" + zone
+                        )
+                )
+        );
+    }
+
+    private DashboardOverviewResponse.IrrigationOverview buildIrrigation(Collection<TelemetrySnapshot> snapshots) {
+        long activeValves = snapshots.stream()
+                .filter(snapshot -> snapshot.name() != null && snapshot.name().matches("V\\d+ C\\d+"))
+                .filter(snapshot -> Boolean.TRUE.equals(snapshot.value()))
+                .count();
+
+        long activePumps = snapshots.stream()
+                .filter(snapshot -> snapshot.name() != null && snapshot.name().toLowerCase().contains("bomba"))
+                .filter(snapshot -> Boolean.TRUE.equals(snapshot.value()))
+                .count();
+
+        return new DashboardOverviewResponse.IrrigationOverview(
+                3,
+                Math.toIntExact(activeValves),
+                Math.toIntExact(activePumps)
+        );
+    }
+
+    private DashboardOverviewResponse.LightingOverview buildLighting(Collection<TelemetrySnapshot> snapshots) {
+        List<TelemetrySnapshot> lightingSectors = snapshots.stream()
+                .filter(snapshot -> snapshot.name() != null && snapshot.name().startsWith("IL Setor"))
+                .toList();
+
+        long activeSectors = lightingSectors.stream()
+                .filter(snapshot -> Boolean.TRUE.equals(snapshot.value()))
+                .count();
+
+        return new DashboardOverviewResponse.LightingOverview(
+                lightingSectors.size(),
+                Math.toIntExact(activeSectors)
+        );
+    }
+
+    private Double numberByAddress(Collection<TelemetrySnapshot> snapshots, int modbusAddress) {
+        return snapshots.stream()
+                .filter(snapshot -> snapshot.modbusAddress() != null)
+                .filter(snapshot -> snapshot.modbusAddress() == modbusAddress)
+                .map(TelemetrySnapshot::value)
+                .filter(Number.class::isInstance)
+                .map(Number.class::cast)
+                .map(Number::doubleValue)
+                .findFirst()
+                .orElse(null);
+    }
+
+    private Double numberByAddressAndNameContains(
+            Collection<TelemetrySnapshot> snapshots,
+            int modbusAddress,
+            String namePart
+    ) {
+        return snapshots.stream()
+                .filter(snapshot -> snapshot.modbusAddress() != null)
+                .filter(snapshot -> snapshot.modbusAddress() == modbusAddress)
+                .filter(snapshot -> snapshot.name() != null)
+                .filter(snapshot -> snapshot.name().toLowerCase().contains(namePart.toLowerCase()))
+                .map(TelemetrySnapshot::value)
+                .filter(Number.class::isInstance)
+                .map(Number.class::cast)
+                .map(Number::doubleValue)
+                .findFirst()
+                .orElse(null);
+    }
+
+    private Boolean booleanByAddress(Collection<TelemetrySnapshot> snapshots, int modbusAddress) {
+        return snapshots.stream()
+                .filter(snapshot -> snapshot.modbusAddress() != null)
+                .filter(snapshot -> snapshot.modbusAddress() == modbusAddress)
+                .map(TelemetrySnapshot::value)
+                .findFirst()
+                .map(value -> {
+                    if (value instanceof Boolean bool) return bool;
+                    if (value instanceof Number number) return number.doubleValue() > 0;
+                    return null;
+                })
+                .orElse(null);
+    }
+
+    private Boolean booleanByAddressAndBit(Collection<TelemetrySnapshot> snapshots, int modbusAddress, int bitOffset) {
+        Optional<TelemetrySnapshot> snapshot = snapshots.stream()
+                .filter(item -> item.modbusAddress() != null && item.modbusAddress() == modbusAddress)
+                .filter(item -> item.bitOffset() != null && item.bitOffset() == bitOffset)
+                .findFirst();
+
+        return snapshot
+                .map(TelemetrySnapshot::value)
+                .filter(Boolean.class::isInstance)
+                .map(Boolean.class::cast)
+                .orElse(null);
+    }
+
+    private Double validTemperature(Double value) {
+        if (value == null || value <= 0 || value > 80) return null;
+        return value;
+    }
+
+    private Double validHumidity(Double value) {
+        if (value == null || value <= 0 || value > 100) return null;
+        return value;
+    }
+
+    private Double validCo2(Double value) {
+        if (value == null || value < 0 || value > 5000) return null;
+        return value;
+    }
+
+    private Double validPercent(Double value) {
+        if (value == null || value < 0 || value > 100) return null;
+        return value;
+    }
+
+    private Double numberByNameContains(
+            Collection<TelemetrySnapshot> snapshots,
+            String namePart
+    ) {
+        return snapshots.stream()
+                .filter(snapshot -> snapshot.name() != null)
+                .filter(snapshot ->
+                        snapshot.name().toLowerCase()
+                                .contains(namePart.toLowerCase())
+                )
+                .map(TelemetrySnapshot::value)
+                .filter(Number.class::isInstance)
+                .map(Number.class::cast)
+                .map(Number::doubleValue)
+                .findFirst()
+                .orElse(null);
+    }
+
+    private Boolean booleanByNameContains(
+            Collection<TelemetrySnapshot> snapshots,
+            String namePart
+    ) {
+        return snapshots.stream()
+                .filter(snapshot -> snapshot.name() != null)
+                .filter(snapshot ->
+                        snapshot.name().toLowerCase()
+                                .contains(namePart.toLowerCase())
+                )
+                .map(TelemetrySnapshot::value)
+                .findFirst()
+                .map(value -> {
+                    if (value instanceof Boolean bool) return bool;
+                    if (value instanceof Number number) return number.doubleValue() > 0;
+                    return null;
+                })
+                .orElse(null);
+    }
+}

src/main/java/com/litoralregas/backend/historian/HistorianController.java

@@ -0,0 +1,49 @@
+package com.litoralregas.backend.historian;
+
+import org.springframework.format.annotation.DateTimeFormat;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.time.Instant;
+import java.util.List;
+
+@RestController
+public class HistorianController {
+
+    private final HistorianService historianService;
+
+    public HistorianController(HistorianService historianService) {
+        this.historianService = historianService;
+    }
+
+    @GetMapping("/api/historian/series")
+    public List<HistorianSeriesPoint> getSeries(
+            @RequestParam String key,
+
+            @RequestParam
+            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+            Instant from,
+
+            @RequestParam
+            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+            Instant to
+    ) {
+        return historianService.getSeries(key, from, to);
+    }
+
+    @GetMapping("/api/historian/dashboard")
+    public HistorianDashboardResponse getDashboardHistory(
+            @RequestParam List<String> keys,
+
+            @RequestParam
+            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+            Instant from,
+
+            @RequestParam
+            @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
+            Instant to
+    ) {
+        return historianService.getDashboardHistory(keys, from, to);
+    }
+}

src/main/java/com/litoralregas/backend/historian/HistorianDashboardResponse.java

@@ -0,0 +1,12 @@
+package com.litoralregas.backend.historian;
+
+import java.time.Instant;
+import java.util.List;
+import java.util.Map;
+
+public record HistorianDashboardResponse(
+        Instant from,
+        Instant to,
+        Map<String, List<HistorianSeriesPoint>> series
+) {
+}

src/main/java/com/litoralregas/backend/historian/HistorianSample.java

@@ -0,0 +1,125 @@
+package com.litoralregas.backend.historian;
+
+import jakarta.persistence.*;
+
+import java.time.Instant;
+
+@Entity
+@Table(
+        name = "historian_sample",
+        indexes = {
+                @Index(
+                        name = "idx_historian_sample_key_sampled_at",
+                        columnList = "key_name, sampled_at"
+                ),
+                @Index(
+                        name = "idx_historian_sample_sampled_at",
+                        columnList = "sampled_at"
+                )
+        }
+)
+public class HistorianSample {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+
+    @Column(name = "sampled_at", nullable = false)
+    private Instant sampledAt;
+
+    @Column(name = "key_name", nullable = false)
+    private String keyName;
+
+    @Column(name = "numeric_value")
+    private Double numericValue;
+
+    @Column(name = "boolean_value")
+    private Boolean booleanValue;
+
+    @Column(name = "text_value")
+    private String textValue;
+
+    @Column(name = "unit")
+    private String unit;
+
+    @Column(name = "source", nullable = false)
+    private String source;
+
+    @Column(name = "created_at", nullable = false, updatable = false)
+    private Instant createdAt;
+
+    @PrePersist
+    public void onCreate() {
+        if (createdAt == null) {
+            createdAt = Instant.now();
+        }
+
+        if (sampledAt == null) {
+            sampledAt = Instant.now();
+        }
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public Instant getSampledAt() {
+        return sampledAt;
+    }
+
+    public void setSampledAt(Instant sampledAt) {
+        this.sampledAt = sampledAt;
+    }
+
+    public String getKeyName() {
+        return keyName;
+    }
+
+    public void setKeyName(String keyName) {
+        this.keyName = keyName;
+    }
+
+    public Double getNumericValue() {
+        return numericValue;
+    }
+
+    public void setNumericValue(Double numericValue) {
+        this.numericValue = numericValue;
+    }
+
+    public Boolean getBooleanValue() {
+        return booleanValue;
+    }
+
+    public void setBooleanValue(Boolean booleanValue) {
+        this.booleanValue = booleanValue;
+    }
+
+    public String getTextValue() {
+        return textValue;
+    }
+
+    public void setTextValue(String textValue) {
+        this.textValue = textValue;
+    }
+
+    public String getUnit() {
+        return unit;
+    }
+
+    public void setUnit(String unit) {
+        this.unit = unit;
+    }
+
+    public String getSource() {
+        return source;
+    }
+
+    public void setSource(String source) {
+        this.source = source;
+    }
+
+    public Instant getCreatedAt() {
+        return createdAt;
+    }
+}

src/main/java/com/litoralregas/backend/historian/HistorianSampleRepository.java

@@ -0,0 +1,22 @@
+package com.litoralregas.backend.historian;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.time.Instant;
+import java.util.Collection;
+import java.util.List;
+
+public interface HistorianSampleRepository extends JpaRepository<HistorianSample, Long> {
+
+    List<HistorianSample> findByKeyNameAndSampledAtBetweenOrderBySampledAtAsc(
+            String keyName,
+            Instant from,
+            Instant to
+    );
+
+    List<HistorianSample> findByKeyNameInAndSampledAtBetweenOrderBySampledAtAsc(
+            Collection<String> keyNames,
+            Instant from,
+            Instant to
+    );
+}

src/main/java/com/litoralregas/backend/historian/HistorianSeriesPoint.java

@@ -0,0 +1,11 @@
+package com.litoralregas.backend.historian;
+
+import java.time.Instant;
+
+public record HistorianSeriesPoint(
+        Instant timestamp,
+        Double numericValue,
+        Boolean booleanValue,
+        String textValue
+) {
+}

src/main/java/com/litoralregas/backend/historian/HistorianService.java

@@ -0,0 +1,153 @@
+package com.litoralregas.backend.historian;
+
+import com.litoralregas.backend.dashboard.DashboardOverviewResponse;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.Instant;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+@Service
+public class HistorianService {
+
+    private static final String SOURCE_DASHBOARD_OVERVIEW = "DASHBOARD_OVERVIEW";
+
+    private final HistorianSampleRepository historianSampleRepository;
+
+    public HistorianService(HistorianSampleRepository historianSampleRepository) {
+        this.historianSampleRepository = historianSampleRepository;
+    }
+
+    @Transactional
+    public void recordDashboardOverview(DashboardOverviewResponse overview) {
+        System.out.println("Historian recording overview at " + overview.timestamp());
+        Instant sampledAt = overview.timestamp();
+
+        System.out.println("Meteo object = " + overview.meteo());
+
+        if (overview.climate() != null && !overview.climate().zones().isEmpty()) {
+            System.out.println(
+                    "Zone 1 temp = " +
+                            overview.climate().zones().get(0).temperature()
+            );
+        }
+        recordNumber(sampledAt, "meteo.exterior_temperature", overview.meteo().exteriorTemperature(), "°C");
+        recordNumber(sampledAt, "meteo.exterior_humidity", overview.meteo().exteriorHumidity(), "%");
+        recordNumber(sampledAt, "meteo.radiation", overview.meteo().radiation(), "W/m²");
+        recordNumber(sampledAt, "meteo.wind_speed", overview.meteo().windSpeed(), "Km/h");
+        recordNumber(sampledAt, "meteo.wind_direction", overview.meteo().windDirection(), "°");
+        recordBoolean(sampledAt, "meteo.raining", overview.meteo().raining());
+
+        if (overview.climate() != null && overview.climate().zones() != null) {
+            for (DashboardOverviewResponse.ClimateZoneOverview zone : overview.climate().zones()) {
+                String prefix = "climate.zone_" + zone.zoneNumber();
+
+                recordNumber(sampledAt, prefix + ".temperature", zone.temperature(), "°C");
+                recordNumber(sampledAt, prefix + ".humidity", zone.humidity(), "%");
+                recordNumber(sampledAt, prefix + ".co2", zone.co2(), "ppm");
+
+                recordBoolean(sampledAt, prefix + ".fans_on", zone.fansOn());
+                recordBoolean(sampledAt, prefix + ".extractors_on", zone.extractorsOn());
+
+                recordNumber(sampledAt, prefix + ".zenital_left_percent", zone.zenitalLeftPercent(), "%");
+                recordNumber(sampledAt, prefix + ".zenital_right_percent", zone.zenitalRightPercent(), "%");
+                recordNumber(sampledAt, prefix + ".lateral_left_percent", zone.lateralLeftPercent(), "%");
+                recordNumber(sampledAt, prefix + ".lateral_right_percent", zone.lateralRightPercent(), "%");
+            }
+        }
+
+        if (overview.irrigation() != null) {
+            recordNumber(
+                    sampledAt,
+                    "irrigation.active_valve_count",
+                    overview.irrigation().activeValveCount(),
+                    "valves"
+            );
+
+            recordNumber(
+                    sampledAt,
+                    "irrigation.active_pump_count",
+                    overview.irrigation().activePumpCount(),
+                    "pumps"
+            );
+        }
+
+        if (overview.lighting() != null) {
+            recordNumber(
+                    sampledAt,
+                    "lighting.active_sector_count",
+                    overview.lighting().activeSectorCount(),
+                    "sectors"
+            );
+        }
+    }
+
+    @Transactional(readOnly = true)
+    public List<HistorianSeriesPoint> getSeries(String keyName, Instant from, Instant to) {
+        return historianSampleRepository
+                .findByKeyNameAndSampledAtBetweenOrderBySampledAtAsc(keyName, from, to)
+                .stream()
+                .map(this::toSeriesPoint)
+                .toList();
+    }
+
+    @Transactional(readOnly = true)
+    public HistorianDashboardResponse getDashboardHistory(
+            List<String> keyNames,
+            Instant from,
+            Instant to
+    ) {
+        List<HistorianSample> samples = historianSampleRepository
+                .findByKeyNameInAndSampledAtBetweenOrderBySampledAtAsc(keyNames, from, to);
+
+        Map<String, List<HistorianSeriesPoint>> grouped = new LinkedHashMap<>();
+
+        for (String keyName : keyNames) {
+            grouped.put(
+                    keyName,
+                    samples.stream()
+                            .filter(sample -> sample.getKeyName().equals(keyName))
+                            .map(this::toSeriesPoint)
+                            .toList()
+            );
+        }
+
+        return new HistorianDashboardResponse(from, to, grouped);
+    }
+
+    private void recordNumber(Instant sampledAt, String keyName, Number value, String unit) {
+        if (value == null) return;
+
+        HistorianSample sample = new HistorianSample();
+        sample.setSampledAt(sampledAt);
+        sample.setKeyName(keyName);
+        sample.setNumericValue(value.doubleValue());
+        sample.setUnit(unit);
+        sample.setSource(SOURCE_DASHBOARD_OVERVIEW);
+        System.out.println("Saving historian sample: " + keyName + " = " + value);
+        historianSampleRepository.save(sample);
+    }
+
+    private void recordBoolean(Instant sampledAt, String keyName, Boolean value) {
+        if (value == null) return;
+
+        HistorianSample sample = new HistorianSample();
+        sample.setSampledAt(sampledAt);
+        sample.setKeyName(keyName);
+        sample.setBooleanValue(value);
+        sample.setSource(SOURCE_DASHBOARD_OVERVIEW);
+
+        historianSampleRepository.save(sample);
+    }
+
+    private HistorianSeriesPoint toSeriesPoint(HistorianSample sample) {
+        return new HistorianSeriesPoint(
+                sample.getSampledAt(),
+                sample.getNumericValue(),
+                sample.getBooleanValue(),
+                sample.getTextValue()
+        );
+    }
+}

src/main/java/com/litoralregas/backend/websocket/dashboard/DashboardOverviewWebSocketPublisher.java

@@ -0,0 +1,37 @@
+package com.litoralregas.backend.websocket.dashboard;
+
+import com.litoralregas.backend.dashboard.DashboardOverviewResponse;
+import com.litoralregas.backend.dashboard.DashboardOverviewService;
+import com.litoralregas.backend.historian.HistorianService;
+import org.springframework.messaging.simp.SimpMessagingTemplate;
+import org.springframework.stereotype.Service;
+
+@Service
+public class DashboardOverviewWebSocketPublisher {
+
+    private static final String DESTINATION = "/topic/dashboard/overview";
+
+    private final SimpMessagingTemplate messagingTemplate;
+    private final DashboardOverviewService dashboardOverviewService;
+    private final HistorianService historianService;
+
+    public DashboardOverviewWebSocketPublisher(
+            SimpMessagingTemplate messagingTemplate,
+            DashboardOverviewService dashboardOverviewService,
+            HistorianService historianService
+    ) {
+        this.messagingTemplate = messagingTemplate;
+        this.dashboardOverviewService = dashboardOverviewService;
+        this.historianService = historianService;
+    }
+
+    public void publishOverview() {
+        DashboardOverviewResponse overview = dashboardOverviewService.getOverview();
+
+        System.out.println("Publishing dashboard overview at " + overview.timestamp());
+
+        historianService.recordDashboardOverview(overview);
+
+        messagingTemplate.convertAndSend(DESTINATION, overview);
+    }
+}

src/main/java/com/litoralregas/backend/websocket/telemetry/TelemetryWebSocketPublisher.java

@@ -1,10 +1,12 @@
 package com.litoralregas.backend.websocket.telemetry;
 
 import com.litoralregas.backend.acquisition.telemetry.TelemetryCache;
+import com.litoralregas.backend.acquisition.telemetry.TelemetrySnapshot;
 import org.springframework.messaging.simp.SimpMessagingTemplate;
 import org.springframework.stereotype.Service;
 
 import java.time.Instant;
+import java.util.Collection;
 
 @Service
 public class TelemetryWebSocketPublisher {
@@ -23,15 +25,14 @@ public class TelemetryWebSocketPublisher {
     }
 
     public void publishLatestTelemetry() {
+        Collection<TelemetrySnapshot> snapshots = telemetryCache.getAll();
+
         TelemetryBroadcastMessage message = new TelemetryBroadcastMessage(
                 Instant.now(),
-                telemetryCache.getAll().size(),
+                snapshots.size(),
-                telemetryCache.getAll()
+                snapshots
         );
 
-        messagingTemplate.convertAndSend(
+        messagingTemplate.convertAndSend(DESTINATION, message);
-                DESTINATION,
-                message
-        );
     }
 }

src/main/resources/db/migration/V4__create_historian_sample.sql

@@ -0,0 +1,21 @@
+CREATE TABLE historian_sample (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+
+    sampled_at TIMESTAMP NOT NULL,
+    key_name VARCHAR(160) NOT NULL,
+
+    numeric_value REAL,
+    boolean_value BOOLEAN,
+    text_value VARCHAR(255),
+
+    unit VARCHAR(32),
+    source VARCHAR(50) NOT NULL,
+
+    created_at TIMESTAMP NOT NULL
+);
+
+CREATE INDEX idx_historian_sample_key_sampled_at
+    ON historian_sample (key_name, sampled_at);
+
+CREATE INDEX idx_historian_sample_sampled_at
+    ON historian_sample (sampled_at);