feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

config/database/database.go

@@ -0,0 +1,80 @@
+// Package database provides database initialization and access for RSMon.
+package database
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+
+	"rsgit.ru/rsmon/rsmon/app/models"
+	_ "rsgit.ru/rsmon/rsmon/config/env" // Import to ensure .env is loaded before reading env vars
+)
+
+// db Gorm DB
+var db *gorm.DB
+
+// Logger provides functionality.
+var Logger logger.Interface
+
+func envOrDefault(key, fallbackKey, defaultVal string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	if fallbackKey != "" {
+		if v := os.Getenv(fallbackKey); v != "" {
+			return v
+		}
+	}
+	return defaultVal
+}
+
+// Init provides functionality.
+func Init() {
+	host := envOrDefault("DATABASE_HOST", "POSTGRES_HOST", "localhost")
+	portStr := envOrDefault("DATABASE_PORT", "POSTGRES_PORT", "5432")
+	user := envOrDefault("DATABASE_USER", "POSTGRES_USER", "rsmon")
+	pass := envOrDefault("DATABASE_PASSWORD", "POSTGRES_PASSWORD", "rsmon")
+	dbname := envOrDefault("DATABASE_NAME", "POSTGRES_DB", "rsmon_development")
+	dbLog := envOrDefault("DATABASE_LOG", "", "false")
+
+	port := 5432
+	_, _ = fmt.Sscanf(portStr, "%d", &port)
+
+	connstr := fmt.Sprintf("host=%s port=%d user=%s password=%s dbname=%s sslmode=disable",
+		host, port, user, pass, dbname)
+
+	logMode := logger.Silent
+	if dbLog == "true" || dbLog == "1" {
+		logMode = logger.Info
+	}
+
+	cfg := &gorm.Config{
+		Logger: logger.Default.LogMode(logMode),
+	}
+
+	pg := postgres.Open(connstr)
+	var err error
+	db, err = gorm.Open(pg, cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	sqlDB, err := db.DB()
+	if err != nil {
+		panic(err)
+	}
+	sqlDB.SetMaxIdleConns(10)
+	sqlDB.SetMaxOpenConns(10)
+	sqlDB.SetConnMaxLifetime(time.Hour)
+
+	models.RegisterCallbacks(db)
+	db = db.Set("gorm:association_autoupdate", false)
+	models.SetDB(db)
+
+	log.Printf("Database connected: %s@%s:%d/%s (log=%s)", user, host, port, dbname, dbLog)
+}