Rewrite electricity-logger to use an sqlite3 database

include/solar/logger/database.hpp

@@ -0,0 +1,25 @@
+#pragma once
+#include <cstdint>
+#include <sqlite3.h>
+#include <string>
+
+struct Row
+{
+    time_t epochTime;
+    std::int32_t watt;
+    double kilowattPerHour;
+};
+
+class Database {
+private:
+    sqlite3 * connectionPtr;
+
+    std::string ToSqlInsertStatement(Row const & row) const;
+    std::string ToSqlUpsertStatement(Row const & row) const;
+
+public:
+    bool Insert(Row & row);
+
+    Database(std::string const & databasePath);
+    ~Database();
+};