go mod tidy

BREAKING: Migrate opendtu to opendtu_address
Add authentication capability for locked-down opendtu's.
Updated setup examples with new variables.

Dockerfile

@@ -1,5 +1,5 @@
 # Use buildx for multi-architecture support
-FROM --platform=${BUILDPLATFORM} golang:1.22 AS builder
+FROM --platform=${BUILDPLATFORM} golang:1.23 AS builder
 
 WORKDIR /app
 
@@ -11,7 +11,10 @@ RUN go mod download
 COPY . .
 
 # Build the application for the specified target architecture
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -o opendtu-logger .
+# https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/
+# Declare TARGETOS and TARGETARCH in the local scope so they can be used in the build stage.
+ARG TARGETOS TARGETARCH
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o opendtu-logger .
 
 # Create a minimal runtime image
 FROM --platform=${TARGETPLATFORM} scratch

docker/compose.with-database-grafana.yml

@@ -22,13 +22,17 @@ services:
       retries: 20
 
   opendtu-logger:
-    image: git.hollander.online/energy/opendtu-logger:main
+    image: git.hollander.online/energy/opendtu-logger:latest
     restart: always
     environment:
       DB_URL: ${DB_URL}
-      REMOTE_URL: ${REMOTE_URL}
+      OPENDTU_ADDRESS: ${OPENDTU_ADDRESS}
+      OPENDTU_AUTH: ${OPENDTU_AUTH}
+      OPENDTU_USERNAME: ${OPENDTU_USERNAME}
+      OPENDTU_PASSWORD: ${OPENDTU_PASSWORD}
       TIMESCALEDB_ENABLED: ${TIMESCALEDB_ENABLED}
       TZ: ${TZ}
+      LOG_LEVEL: ${LOG_LEVEL}
     depends_on:
       timescaledb:
         condition: service_healthy

docker/compose.with-database.yml

@@ -23,12 +23,17 @@ services:
 
   opendtu-logger:
     restart: always
-    image: git.hollander.online/energy/opendtu-logger:main
+    image: git.hollander.online/energy/opendtu-logger:latest
     environment:
       DB_URL: ${DB_URL}
-      REMOTE_URL: ${REMOTE_URL}
+      OPENDTU_ADDRESS: ${OPENDTU_ADDRESS}
+      OPENDTU_AUTH: ${OPENDTU_AUTH}
+      OPENDTU_USERNAME: ${OPENDTU_USERNAME}
+      OPENDTU_PASSWORD: ${OPENDTU_PASSWORD}
       TIMESCALEDB_ENABLED: ${TIMESCALEDB_ENABLED}
       TZ: ${TZ}
+      LOG_LEVEL: ${LOG_LEVEL}
+
     depends_on:
       timescaledb:
         condition: service_healthy

docker/compose.yml

@@ -2,12 +2,16 @@ version: '3.8'
 services:
   opendtu-logger:
     restart: always
-    image: git.hollander.online/energy/opendtu-logger:main
+    image: git.hollander.online/energy/opendtu-logger:latest
     environment:
       DB_URL: ${DB_URL}
-      REMOTE_URL: ${REMOTE_URL}
+      OPENDTU_ADDRESS: ${OPENDTU_ADDRESS}
+      OPENDTU_AUTH: ${OPENDTU_AUTH}
+      OPENDTU_USERNAME: ${OPENDTU_USERNAME}
+      OPENDTU_PASSWORD: ${OPENDTU_PASSWORD}
       TIMESCALEDB_ENABLED: ${TIMESCALEDB_ENABLED}
       TZ: ${TZ}
+      LOG_LEVEL: ${LOG_LEVEL}
     depends_on:
       timescaledb:
         condition: service_healthy

docker/example.env

@@ -0,0 +1,11 @@
+# OpenDTU
+OPENDTU_ADDRESS="192.168.1.89:80"
+OPENDTU_AUTH=false
+OPENDTU_USERNAME=admin
+OPENDTU_PASSWORD=
+
+# OpenDTU Logger
+DB_URL="host=timescaledb port=5432 user=postgres password=secret dbname=opendtu_logger sslmode=disable"
+TIMESCALEDB_ENABLED=true
+TZ="Europe/Amsterdam"
+LOG_LEVEL=INFO"

docker/example.with-database.env

@@ -1,9 +1,16 @@
+# OpenDTU
+OPENDTU_ADDRESS="192.168.1.89:80"
+OPENDTU_AUTH=false
+OPENDTU_USERNAME=admin
+OPENDTU_PASSWORD=
+
 # OpenDTU Logger
-REMOTE_URL="192.168.1.89:80"
 DB_URL="host=timescaledb port=5432 user=postgres password=secret dbname=opendtu_logger sslmode=disable"
 TIMESCALEDB_ENABLED=true
 TZ="Europe/Amsterdam"
+LOG_LEVEL=INFO"
+
 # Database configuration
 PG_USER=postgres
 PG_PASSWORD=
-PG_DB=opendtu_logger
+PG_DB=opendtu_logger

go.mod

@@ -1,10 +1,16 @@
 module git.hollander.online/energy/opendtu-logger
 
-go 1.22
+go 1.23
 
 require (
-	github.com/gorilla/websocket v1.5.1
+	github.com/gorilla/websocket v1.5.3
 	github.com/lib/pq v1.10.9
+	github.com/pressly/goose/v3 v3.22.0
 )
 
-require golang.org/x/net v0.17.0 // indirect
+require (
+	github.com/mfridman/interpolate v0.0.2 // indirect
+	github.com/sethvargo/go-retry v0.3.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+)

go.sum

@@ -1,6 +1,50 @@
-github.com/gorilla/websocket v1.5.1 h1:gmztn0JnHVt9JZquRuzLw3g4wouNVzKL15iLr/zn/QY=
-github.com/gorilla/websocket v1.5.1/go.mod h1:x3kM2JMyaluk02fnUJpQuwD2dCS5NDG2ZHL0uE0tcaY=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
+github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
 github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
 github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
-golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
-golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
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+github.com/mfridman/interpolate v0.0.2 h1:pnuTK7MQIxxFz1Gr+rjSIx9u7qVjf5VOoM/u6BbAxPY=
+github.com/mfridman/interpolate v0.0.2/go.mod h1:p+7uk6oE07mpE/Ik1b8EckO0O4ZXiGAfshKBWLUM9Xg=
+github.com/ncruces/go-strftime v0.1.9 h1:bY0MQC28UADQmHmaF5dgpLmImcShSi2kHU9XLdhx/f4=
+github.com/ncruces/go-strftime v0.1.9/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/pressly/goose/v3 v3.22.0 h1:wd/7kNiPTuNAztWun7iaB98DrhulbWPrzMAaw2DEZNw=
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+github.com/sethvargo/go-retry v0.3.0 h1:EEt31A35QhrcRZtrYFDTBg91cqZVnFL2navjDrah2SE=
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+modernc.org/libc v1.55.3 h1:AzcW1mhlPNrRtjS5sS+eW2ISCgSOLLNyFzRh/V3Qj/U=
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+modernc.org/memory v1.8.0 h1:IqGTL6eFMaDZZhEWwcREgeMXYwmW83LYW8cROZYkg+E=
+modernc.org/memory v1.8.0/go.mod h1:XPZ936zp5OMKGWPqbD3JShgd/ZoQ7899TUuQqxY+peU=
+modernc.org/sqlite v1.32.0 h1:6BM4uGza7bWypsw4fdLRsLxut6bHe4c58VeqjRgST8s=
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+modernc.org/strutil v1.2.0 h1:agBi9dp1I+eOnxXeiZawM8F4LawKv4NzGWSaLfyeNZA=
+modernc.org/strutil v1.2.0/go.mod h1:/mdcBmfOibveCTBxUl5B5l6W+TTH1FXPLHZE6bTosX0=
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main.go

@@ -1,16 +1,18 @@
 // TODO: Storage optimisation: Map inverter serial to shorter serial. Use that for referring.
-// TODO: Use username and password provided using Basic Authentication.
 // TODO: Record Inverter struct data only on-change.
 // Idea: Make a full admin / config GUI and only configure through this utility.
 // Idea: Gather settings only on start-up.
 // TODO: Only update meter readings such as yieldday, yieldtotal on-change.
-// TODO: Implement proper DB migrations.
+// TODO: Add a health check endpoint, potentially log to it.
+// TODO: Add support for monitoring multiple OpenDTU's at once.
 package main
 
 import (
 	"database/sql"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"io/fs"
 	"log"
 	"log/slog"
 	"net/http"
@@ -19,8 +21,10 @@ import (
 	"time"
 	_ "time/tzdata"
 
+	"git.hollander.online/energy/opendtu-logger/migrations"
 	"github.com/gorilla/websocket"
 	_ "github.com/lib/pq"
+	"github.com/pressly/goose/v3"
 )
 
 // VUD contains three variables used for most metrics sent by OpenDTU:
@@ -146,10 +150,14 @@ type InverterSettingsData struct {
 
 // Config settings struct
 type Config struct {
-	DB          string `json:"db"`
-	OpenDTU     string `json:"opendtu"`
-	TimescaleDB bool   `json:"timescaledb"`
-	TZ          string `json:"tz"`
+	DB              string `json:"db"`
+	OpenDTUAddress  string `json:"opendtu_address"`
+	OpenDTUAuth     bool   `json:"opendtu_auth"`
+	OpenDTUUser     string `json:"opendtu_username"`
+	OpenDTUPassword string `json:"opendtu_password"`
+	TimescaleDB     bool   `json:"timescaledb"`
+	TZ              string `json:"tz"`
+	LogLevel        string `json:"log_level"`
 }
 
 var logger = slog.New(slog.NewJSONHandler(os.Stdout, nil))
@@ -170,15 +178,50 @@ func loadConfig() Config {
 		if err != nil {
 			log.Fatalf("Error parsing config file: %v", err)
 		}
+		if config.DB == "" {
+			log.Fatal("db connection settings are not set")
+		}
+		if config.OpenDTUAddress == "" {
+			log.Fatal("opendtu_address is not set")
+		}
+		if config.OpenDTUAuth {
+			if config.OpenDTUUser == "" {
+				log.Fatal("opendtu_username is not set, while opendtu_auth is set to enabled. Set opendtu_auth to false or set username")
+			}
+			if config.OpenDTUPassword == "" {
+				log.Fatal("opendtu_password is not set, while opendtu_auth is set to enabled. Set opendtu_auth to false or set password")
+			}
+		}
 	} else {
+		logger.Info("JSON config file not found. Falling back to environment variables.")
 		// Fallback to environment variables
 		config.DB = os.Getenv("DB_URL")
 		if config.DB == "" {
 			log.Fatal("DB_URL environment variable is not set.")
 		}
-		config.OpenDTU = os.Getenv("REMOTE_URL")
-		if config.OpenDTU == "" {
-			log.Fatal("REMOTE_URL environment variable is not set.")
+		config.OpenDTUAddress = os.Getenv("OPENDTU_ADDRESS")
+		if config.OpenDTUAddress == "" {
+			log.Fatal("OPENDTU_ADDRESS environment variable is not set.")
+		}
+
+		openDTUAuthStr := os.Getenv("OPENDTU_AUTH")
+		if openDTUAuthStr != "" {
+			openDTUAuth, err := strconv.ParseBool(openDTUAuthStr)
+			if err != nil {
+				log.Fatalf("Error parsing OPENDTU_AUTH: %v", err)
+			}
+			config.OpenDTUAuth = openDTUAuth
+		}
+		if config.OpenDTUAuth {
+			config.OpenDTUUser = os.Getenv("OPENDTU_USERNAME")
+			if config.OpenDTUUser == "" {
+				log.Fatal("OPENDTU_USERNAME environment variable is not set.")
+			}
+			config.OpenDTUPassword = os.Getenv("OPENDTU_PASSWORD")
+			if config.OpenDTUPassword == "" {
+				log.Fatal("OPENDTU_PASSWORD environment variable is not set.")
+			}
+
 		}
 
 		timescaleDBStr := os.Getenv("TIMESCALEDB_ENABLED")
@@ -190,11 +233,40 @@ func loadConfig() Config {
 			config.TimescaleDB = timescaleDB
 		}
 		config.TZ = os.Getenv("TZ")
+		config.LogLevel = os.Getenv("LOG_LEVEL")
+	}
+	_, err = time.LoadLocation(config.TZ)
+	if err != nil {
+		logger.Warn("invalid timezone")
 	}
 
 	return config
 }
 
+// Helper function to map environment variable to slog.Level
+func getLogLevel(defaultLevel slog.Level) slog.Level {
+	logLevelStr := config.LogLevel
+	switch logLevelStr {
+	case "DEBUG":
+		return slog.LevelDebug
+	case "INFO":
+		return slog.LevelInfo
+	case "WARN":
+		return slog.LevelWarn
+	case "ERROR":
+		return slog.LevelError
+	default:
+		return defaultLevel
+	}
+}
+
+// Function to create a new logger with a specified log level
+func createLoggerWithLevel(level slog.Level) *slog.Logger {
+	return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
+		Level: level,
+	}))
+}
+
 // Main program
 func main() {
 	// Initial logger setup
@@ -203,6 +275,10 @@ func main() {
 	// Load the configuration
 	config := loadConfig()
 
+	// Set the logLevel
+	logLevel := getLogLevel(slog.LevelInfo) // Default to info level
+	logger = createLoggerWithLevel(logLevel)
+
 	dbConnStr := config.DB
 	// Connect to PostgreSQL
 	db, err := sql.Open("postgres", dbConnStr)
@@ -212,13 +288,21 @@ func main() {
 	defer db.Close()
 
 	// Create tables if they don't exist
-	createTables(db)
+	migrateDB(db)
 
 	// Create WebSocket URL from config variable
-	wsURL := "ws://" + config.OpenDTU + "/livedata"
+	wsURL := "ws://" + config.OpenDTUAddress + "/livedata"
+
+	logger.Debug(wsURL)
+
+	// Create headers with optional Basic Auth
+	headers := http.Header{}
+	if config.OpenDTUAuth {
+		headers.Set("Authorization", basicAuth(config.OpenDTUUser, config.OpenDTUPassword))
+	}
 
 	// Establish WebSocket connection
-	c, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
+	c, _, err := websocket.DefaultDialer.Dial(wsURL, headers)
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -287,122 +371,14 @@ func handleMessage(message []byte, db *sql.DB) {
 	}
 }
 
-func createTables(db *sql.DB) {
-	// Execute SQL statements to create tables if they don't exist
-	// inverter_serial is TEXT as some non-Hoymiles inverters use non-numeric serial numbers.
-	// An additional advantage is that it makes plotting in Grafana easier.
+func migrateDB(db *sql.DB) {
 	// TODO: Foreign keys commented out as TimescaleDB hypertables don't support them.
-	createTableSQL := `
-	CREATE TABLE IF NOT EXISTS opendtu_log (
-		timestamp TIMESTAMPTZ UNIQUE DEFAULT CURRENT_TIMESTAMP,
-		power NUMERIC,
-		yieldday NUMERIC,
-		yieldtotal NUMERIC
-	);
-	
-	CREATE TABLE IF NOT EXISTS opendtu_inverters (
-		timestamp TIMESTAMPTZ,
-		-- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
-		inverter_serial TEXT,
-		name TEXT,
-		producing BOOL,
-		limit_relative NUMERIC,
-		limit_absolute NUMERIC
-	);
-	
-	CREATE TABLE IF NOT EXISTS opendtu_inverters_ac (
-		timestamp TIMESTAMPTZ,
-		-- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
-		inverter_serial TEXT,
-		ac_number INT,
-		power NUMERIC,
-		voltage NUMERIC,
-		current NUMERIC,
-		frequency NUMERIC,
-		powerfactor NUMERIC,
-		reactivepower NUMERIC
-	);
-	
-	CREATE TABLE IF NOT EXISTS opendtu_inverters_dc (
-		-- id SERIAL PRIMARY KEY,
-		timestamp TIMESTAMPTZ,
-		-- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
-		inverter_serial TEXT,
-     	dc_number INT,
-		name TEXT,
-		power NUMERIC,
-		voltage NUMERIC,
-		current NUMERIC,
-		yieldday NUMERIC,
-		yieldtotal NUMERIC,
-		irradiation NUMERIC
-	);
-	
-	CREATE TABLE IF NOT EXISTS opendtu_inverters_inv (
-		-- id SERIAL PRIMARY KEY,
-		timestamp TIMESTAMPTZ,
-		-- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
-		inverter_serial TEXT,
-		temperature NUMERIC,
-		power_dc NUMERIC,
-		yieldday NUMERIC,
-		yieldtotal NUMERIC,
-		efficiency NUMERIC
-	);
 
-	CREATE TABLE IF NOT EXISTS opendtu_events (
-		-- id SERIAL PRIMARY KEY,
-		timestamp TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
-		inverter_serial TEXT,
-		message_id INT,
-		message TEXT,
-		start_time INT,
-		end_time INT
-	);
+	// Perform DB migrations
+	err := migrateFS(db, migrations.FS, ".")
 
-	DO $$
-	BEGIN
-		-- Check if start_timestamp column exists
-		IF NOT EXISTS (SELECT 1 FROM information_schema.columns 
-					WHERE table_name='opendtu_events' 
-					AND column_name='start_timestamp') THEN
-			-- Add start_timestamp column
-			ALTER TABLE opendtu_events 
-			ADD COLUMN start_timestamp TIMESTAMPTZ;
-		END IF;
-
-		-- Check if end_timestamp column exists
-		IF NOT EXISTS (SELECT 1 FROM information_schema.columns 
-					WHERE table_name='opendtu_events' 
-					AND column_name='end_timestamp') THEN
-			-- Add end_timestamp column
-			ALTER TABLE opendtu_events 
-			ADD COLUMN end_timestamp TIMESTAMPTZ;
-		END IF;
-	END $$;
-
-	CREATE TABLE IF NOT EXISTS opendtu_hints (
-		-- id SERIAL PRIMARY KEY,
-		timestamp TIMESTAMPTZ,
-		-- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
-		time_sync BOOL,
-		radio_problem BOOL,
-		default_password BOOL
-	);
-	
-	CREATE INDEX IF NOT EXISTS opendtu_log_timestamp_idx ON opendtu_log (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_inverters_timestamp_idx ON opendtu_inverters (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_inverters_ac_timestamp_idx ON opendtu_inverters_ac (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_inverters_dc_timestamp_idx ON opendtu_inverters_dc (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_inverters_inv_timestamp_idx ON opendtu_inverters_inv (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_events_timestamp_idx ON opendtu_events (timestamp);
-	CREATE INDEX IF NOT EXISTS opendtu_hints_timestamp_idx ON opendtu_hints (timestamp);
-
-	`
-
-	_, err := db.Exec(createTableSQL)
 	if err != nil {
-		log.Fatal("Error creating tables: ", err)
+		log.Fatal("Error performing database migrations: ", err)
 	}
 	timescaleEnabled := config.TimescaleDB
 
@@ -502,16 +478,60 @@ func insertLiveData(db *sql.DB, inverter Inverter, total Total, hints Hints) {
 
 }
 
-func queryEventsEndpoint(inverterSerial string) (*EventsResponse, error) {
-	remoteURL := config.OpenDTU
-	endpoint := fmt.Sprintf("http://"+remoteURL+"/api/eventlog/status?inv=%s", inverterSerial)
+func migrate(db *sql.DB, dir string) error {
+	err := goose.SetDialect("postgres")
+	if err != nil {
+		return fmt.Errorf("migrate: %w", err)
+	}
+	err = goose.Up(db, dir)
+	if err != nil {
+		return fmt.Errorf("migrate: %w", err)
+	}
+	return nil
 
-	resp, err := http.Get(endpoint)
+}
+
+func migrateFS(db *sql.DB, migrationFS fs.FS, dir string) error {
+	// In case the dir is an empty string, they probably meant the current directory and goose wants a period for that.
+	if dir == "" {
+		dir = "."
+	}
+	goose.SetBaseFS(migrationFS)
+	defer func() {
+		// Ensure that we remove the FS on the off chance some other part of our app uses goose for migrations and doesn't want to use our FS.
+		goose.SetBaseFS(nil)
+	}()
+	return migrate(db, dir)
+}
+
+func queryEventsEndpoint(inverterSerial string) (*EventsResponse, error) {
+	endpoint := fmt.Sprintf("http://"+config.OpenDTUAddress+"/api/eventlog/status?inv=%s", inverterSerial)
+
+	// Create a new HTTP request
+	req, err := http.NewRequest("GET", endpoint, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if config.OpenDTUAuth {
+		// Add Basic Auth header
+		req.Header.Add("Authorization", basicAuth(config.OpenDTUUser, config.OpenDTUPassword))
+	}
+
+	// Send the request
+	client := &http.Client{}
+	resp, err := client.Do(req)
 	if err != nil {
 		return nil, err
 	}
 	defer resp.Body.Close()
 
+	// Check for HTTP errors
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("HTTP request failed with status: %s", resp.Status)
+	}
+
+	// Decode the response
 	var eventsResponse EventsResponse
 	if err := json.NewDecoder(resp.Body).Decode(&eventsResponse); err != nil {
 		return nil, err
@@ -544,7 +564,9 @@ func getPreviousEventsCount(db *sql.DB, inverterSerial string) int {
 }
 
 func insertEvents(db *sql.DB, inverterSerial string, events *EventsResponse) {
-	timestamp := time.Now()
+	timeZone := config.TZ
+	loc, _ := time.LoadLocation(timeZone)
+	timestamp := time.Now().In(loc)
 
 	for _, event := range events.Events {
 		// Insert events data into the events table
@@ -587,6 +609,12 @@ func updateEvents(db *sql.DB, inverterSerial string, events *EventsResponse) {
 	}
 }
 
+// basicAuth generates the Basic Auth header value
+func basicAuth(username, password string) string {
+	credentials := username + ":" + password
+	return "Basic " + base64.StdEncoding.EncodeToString([]byte(credentials))
+}
+
 // TODO: finish this function.
 // func updateInverterConfig(db *sql.DB) {
 // 	// Periodically query the /api/inverter/list
@@ -605,8 +633,8 @@ func updateEvents(db *sql.DB, inverterSerial string, events *EventsResponse) {
 // }
 
 // func queryConfigEndpoint() (*InverterSettingsData, error) {
-// 	remoteURL := os.Getenv("REMOTE_URL")
-// 	endpoint := fmt.Sprintf("http://" + remoteURL + "/api/inverter/list")
+// 	openDTUAddress := os.Getenv("OPENDTU_ADDRESS")
+// 	endpoint := fmt.Sprintf("http://" + openDTUAddress + "/api/inverter/list")
 
 // 	resp, err := http.Get(endpoint)
 // 	if err != nil {

migrations/00001_log.sql

@@ -0,0 +1,14 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_log (
+    timestamp TIMESTAMPTZ UNIQUE DEFAULT CURRENT_TIMESTAMP,
+    power NUMERIC,
+    yieldday NUMERIC,
+    yieldtotal NUMERIC
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_log_timestamp_idx ON opendtu_log (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00002_inverters.sql

@@ -0,0 +1,19 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_inverters (
+    timestamp TIMESTAMPTZ,
+    -- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
+    -- 	inverter_serial is TEXT as some non-Hoymiles inverters use non-numeric serial numbers.
+    -- 	An additional advantage is that it makes plotting in Grafana easier.
+    inverter_serial TEXT,
+    name TEXT,
+    producing BOOL,
+    limit_relative NUMERIC,
+    limit_absolute NUMERIC
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_inverters_timestamp_idx ON opendtu_inverters (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00003_inverters_ac.sql

@@ -0,0 +1,20 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_inverters_ac (
+    timestamp TIMESTAMPTZ,
+    -- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
+    inverter_serial TEXT,
+    ac_number INT,
+    power NUMERIC,
+    voltage NUMERIC,
+    current NUMERIC,
+    frequency NUMERIC,
+    powerfactor NUMERIC,
+    reactivepower NUMERIC
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_inverters_ac_timestamp_idx ON opendtu_inverters_ac (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00004_inverters_dc.sql

@@ -0,0 +1,22 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_inverters_dc (
+    -- id SERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ,
+    -- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
+    inverter_serial TEXT,
+    dc_number INT,
+    name TEXT,
+    power NUMERIC,
+    voltage NUMERIC,
+    current NUMERIC,
+    yieldday NUMERIC,
+    yieldtotal NUMERIC,
+    irradiation NUMERIC
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_inverters_dc_timestamp_idx ON opendtu_inverters_dc (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00005_inverters_inv.sql

@@ -0,0 +1,19 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_inverters_inv (
+    -- id SERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ,
+    -- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
+    inverter_serial TEXT,
+    temperature NUMERIC,
+    power_dc NUMERIC,
+    yieldday NUMERIC,
+    yieldtotal NUMERIC,
+    efficiency NUMERIC
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_inverters_inv_timestamp_idx ON opendtu_inverters_inv (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00006_events.sql

@@ -0,0 +1,17 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_events (
+	-- id SERIAL PRIMARY KEY,
+	timestamp TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
+	inverter_serial TEXT,
+	message_id INT,
+	message TEXT,
+	start_time INT,
+	end_time INT
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_events_timestamp_idx ON opendtu_events (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00007_events.sql

@@ -0,0 +1,26 @@
+-- +goose Up
+-- +goose StatementBegin
+DO $$
+BEGIN
+    -- Check if start_timestamp column exists
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns 
+                WHERE table_name='opendtu_events' 
+                AND column_name='start_timestamp') THEN
+        -- Add start_timestamp column
+        ALTER TABLE opendtu_events 
+        ADD COLUMN start_timestamp TIMESTAMPTZ;
+    END IF;
+
+    -- Check if end_timestamp column exists
+    IF NOT EXISTS (SELECT 1 FROM information_schema.columns 
+                WHERE table_name='opendtu_events' 
+                AND column_name='end_timestamp') THEN
+        -- Add end_timestamp column
+        ALTER TABLE opendtu_events 
+        ADD COLUMN end_timestamp TIMESTAMPTZ;
+    END IF;
+END $$;
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/00008_hints.sql

@@ -0,0 +1,16 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS opendtu_hints (
+    -- id SERIAL PRIMARY KEY,
+    timestamp TIMESTAMPTZ,
+    -- FOREIGN KEY (timestamp) REFERENCES opendtu_log(timestamp),
+    time_sync BOOL,
+    radio_problem BOOL,
+    default_password BOOL
+);
+
+CREATE INDEX IF NOT EXISTS opendtu_hints_timestamp_idx ON opendtu_hints (timestamp);
+-- +goose StatementEnd
+-- +goose Down
+-- +goose StatementBegin
+-- +goose StatementEnd

migrations/fs.go

@@ -0,0 +1,6 @@
+package migrations
+
+import "embed"
+
+//go:embed *.sql
+var FS embed.FS

systemd/opendtu-logger.service

@@ -16,10 +16,15 @@ Type=simple
 User=opendtu-logger
 Group=opendtu-logger
 
-Environment="REMOTE_URL=opendtu.local:80"
+Environment="OPENDTU_ADDRESS=opendtu.local:80"
+Environment="OPENDTU_AUTH=false"
+Environment="OPENDTU_USERNAME=admin"
+Environment="OPENDTU_PASSWORD=your_super_secret_password"
 Environment="DB_URL=host=localhost port=5432 user=postgres password=secret dbname=dtu sslmode=disable"
 Environment="TIMESCALEDB_ENABLED=true"
 Environment="TZ=Europe/Amsterdam"
+Environment="LOG_LEVEL=INFO"
+
 
 WorkingDirectory=/opt/opendtu-logger/
 ExecStart=/opt/opendtu-logger/opendtu-logger