chore: coded post req for create posts on db

backend/internal/storage/db.go

@@ -12,24 +12,21 @@ var db_path = os.Getenv(
 	"DB_PATH",
 ) + "?_journal_mode=WAL&_busy_timeout=5000&_synchronous=NORMAL&_cache_size=2000&_foreign_keys=ON"
 
-func CreateTables() error {
+func CreateTables(db *sql.DB) error {
 	logger := logger.New(false)
-	db, err := sql.Open("sqlite", db_path)
-	if err != nil {
-		logger.Error(err.Error())
-		return err
-	}
-	_, err = db.Exec(Migrations)
+	_, err := db.Exec(Migrations)
 	if err != nil {
 		logger.Error(err.Error())
 		return err
 	}
 
-	defer func() {
-		err = db.Close()
-		if err != nil {
-			logger.Error(err.Error())
-		}
-	}()
 	return nil
 }
+
+func OpenSession() (*sql.DB, error) {
+	db, err := sql.Open("sqlite", db_path)
+	if err != nil {
+		return nil, err
+	}
+	return db, nil
+}