Improve SQLite

- Now the cache isn't cleared and fetched from zero each update, but only when there's missing information for a day
- Fixed a bug that prevented new users from saving changes in the config

NOTE: Turns out that HomeAssistant's API only returns data for the last 10 days. Looks like we will have to improve the caching system to work around this.

config.go

@@ -64,6 +64,21 @@ func formatURL(url string) (string, error) {
 
 func loadConfig() (config Config, err error, isFirstRun bool) {
 
+	db, err := sql.Open("sqlite3", "./database.db")
+	if err != nil {
+		return Config{}, err, false
+	}
+
+	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS "cache" (
+		"time"	NUMERIC NOT NULL,
+		"green_energy_percentage"	REAL NOT NULL,
+		"energy_consumption"	REAL NOT NULL,
+		PRIMARY KEY("time")
+	);`)
+	if err != nil {
+		return Config{}, err, false
+	}
+
 	var defaultConfig = Config{}
 	defaultConfig.Dashboard.Theme = "default"
 	defaultConfig.Dashboard.Name = "EcoDash"
@@ -76,6 +91,7 @@ func loadConfig() (config Config, err error, isFirstRun bool) {
 		NewTab:      true,
 		Primary:     true,
 	})
+	defaultConfig.db = db
 
 	data, err := os.ReadFile("config.json")
 	if err != nil {
@@ -96,23 +112,8 @@ func loadConfig() (config Config, err error, isFirstRun bool) {
 	if err != nil {
 		return Config{}, err, false
 	}
-
-	db, err := sql.Open("sqlite3", "./database.db")
-	if err != nil {
-		return Config{}, err, false
-	}
 	conf.db = db
 
-	_, err = db.Exec(`CREATE TABLE IF NOT EXISTS "cache" (
-		"time"	NUMERIC NOT NULL,
-		"green_energy_percentage"	REAL NOT NULL,
-		"energy_consumption"	REAL NOT NULL,
-		PRIMARY KEY("time")
-	);`)
-	if err != nil {
-		return Config{}, err, false
-	}
-
 	return conf, nil, false
 
 }