Add settings persistance on backend

backend/internal/db/settings.go

@@ -0,0 +1,38 @@
+package db
+
+import (
+	"database/sql"
+	"encoding/json"
+
+	"novamd/internal/models"
+)
+
+func (db *DB) GetSettings(userID int) (models.Settings, error) {
+	var settings models.Settings
+	var settingsJSON string
+
+	err := db.QueryRow("SELECT user_id, settings FROM settings WHERE user_id = ?", userID).Scan(&settings.UserID, &settingsJSON)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return settings, nil
+		}
+		return settings, err
+	}
+
+	err = json.Unmarshal([]byte(settingsJSON), &settings.Settings)
+	if err != nil {
+		return settings, err
+	}
+
+	return settings, nil
+}
+
+func (db *DB) SaveSettings(settings models.Settings) error {
+	settingsJSON, err := json.Marshal(settings.Settings)
+	if err != nil {
+		return err
+	}
+
+	_, err = db.Exec("INSERT OR REPLACE INTO settings (user_id, settings) VALUES (?, ?)", settings.UserID, string(settingsJSON))
+	return err
+}