SQLite Initial Implementation

This is the first, most basic implementation of a SQLite database for caching.
Future commits will make it much more optimized and able to efficiently store data for periods longer than 8 days.

config.go

@@ -2,10 +2,12 @@ package main
 
 import (
 	"crypto/sha256"
+	"database/sql"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"github.com/gofiber/fiber/v2"
+	_ "github.com/mattn/go-sqlite3"
 	"os"
 	"regexp"
 	"strings"
@@ -13,6 +15,7 @@ import (
 )
 
 type Config struct {
+	db            *sql.DB
 	HomeAssistant HomeAssistant `json:"home_assistant"`
 	Sensors       Sensors       `json:"sensors"`
 	Administrator Administrator `json:"administrator"`
@@ -94,6 +97,22 @@ func loadConfig() (config Config, err error, isFirstRun bool) {
 		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
 
 }