Added possibility deploy with k3s

backend/migrations/000001-create-pg-cron-extension.down.sql

@@ -0,0 +1 @@
+DROP EXTENSION pg_cron;

backend/migrations/000001-create-pg-cron-extension.up.sql

@@ -0,0 +1 @@
+CREATE EXTENSION IF NOT EXISTS pg_cron;

backend/src/config/config.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"errors"
+	"fmt"
 	"os"
 	"strings"
 
@@ -33,7 +34,6 @@ func Load() (Config, error) {
 	mode := os.Getenv("RUN_MODE")
 	debugMode := os.Getenv("DEBUG_MODE") == "true"
 	botToken := os.Getenv("BOT_TOKEN")
-	dbConnectionString := os.Getenv("DB_PATH")
 	ocrTokenPath := os.Getenv("GOOGLE_APPLICATION_CREDENTIALS")
 	apiPort := os.Getenv("API_PORT")
 	apiHost := os.Getenv("API_HOST")
@@ -42,6 +42,7 @@ func Load() (Config, error) {
 	openAPIEndpoint := os.Getenv("OPEN_API_ENDPOINT")
 
 	runMode, err := ParseRunMode(mode)
+	dbConnectionString := buildConnectionString()
 	if err != nil {
 		warnings = append(warnings, err.Error())
 	}
@@ -61,9 +62,6 @@ func Load() (Config, error) {
 		if apiSecret == "" {
 			warnings = append(warnings, "Missing required environment variable: API_SECRET")
 		}
-		if dbConnectionString == "" {
-			dbConnectionString = "sqlite://data/app.db"
-		}
 		if apiHost == "" {
 			apiHost = "localhost"
 		}
@@ -92,3 +90,30 @@ func Load() (Config, error) {
 		TelegramApi:        "https://api.telegram.org",
 	}, nil
 }
+
+func buildConnectionString() string {
+	// если задана готовая строка — используем её (удобно для локальной разработки через .env)
+	if dsn := os.Getenv("DB_PATH"); dsn != "" {
+		return dsn
+	}
+
+	// собираем из отдельных переменных (для Kubernetes)
+	host := os.Getenv("DB_HOST")
+	port := os.Getenv("DB_PORT")
+	user := os.Getenv("DB_USER")
+	password := os.Getenv("DB_PASSWORD")
+	dbName := os.Getenv("DB_NAME")
+
+	if host == "" || user == "" || password == "" || dbName == "" {
+		return ""
+	}
+
+	if port == "" {
+		port = "5432"
+	}
+
+	return fmt.Sprintf(
+		"postgres://%s:%s@%s:%s/%s?sslmode=disable",
+		user, password, host, port, dbName,
+	)
+}