change db from sqlite3 to postgresql

cmd/frontend/main.go

@@ -3,13 +3,11 @@ package main
 import (
 	"crowsnest/internal/model/database"
 	"database/sql"
-	"errors"
 	"log"
 	"net/http"
 	"os"
 
 	_ "github.com/lib/pq"
-	_ "github.com/mattn/go-sqlite3"
 )
 
 type App struct {
@@ -19,24 +17,17 @@ type App struct {
 func main() {
 	// collect environement variables
 	databaseURL := os.Getenv("DB_URL")
-	dbDriver := os.Getenv("DB_DRIVER")
 
 	// connect to database
-	var db *sql.DB
-	var err error
-	switch {
-	case dbDriver == "sqlite3":
-		db, err = sql.Open("sqlite3", databaseURL)
-		if err != nil {
-			log.Fatal(err)
-		}
-	default:
-		log.Fatal(errors.New("given DB_DRIVER is not supported"))
+	db, err := sql.Open("postgres", databaseURL)
+	if err != nil {
+		log.Fatal(err)
 	}
+	defer db.Close()
 
 	// define app
 	app := &App{
-		articles: &database.ArticleModel{DB: db, DbDriver: dbDriver},
+		articles: &database.ArticleModel{DB: db},
 	}
 
 	// start web server