Revert "Removes internal directory"

This reverts commit 5005186cd3.

internal/database/database.go

@@ -0,0 +1,38 @@
+package database
+
+import (
+	"embed"
+	"fmt"
+
+	"github.com/jmoiron/sqlx"
+	_ "github.com/mattn/go-sqlite3"
+	migrate "github.com/rubenv/sql-migrate"
+)
+
+var DB *sqlx.DB
+
+//go:embed migrations/*
+var dbMigrations embed.FS
+
+func Connect(filename string) error {
+	DB, err := sqlx.Open("sqlite3", filename)
+
+	if err != nil {
+		return err
+	}
+
+	migrations := migrate.EmbedFileSystemMigrationSource{
+		FileSystem: dbMigrations,
+		Root:       "migrations",
+	}
+
+	n, err := migrate.Exec(DB.DB, "sqlite3", migrations, migrate.Up)
+
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Applied %d migrations - Database is ready!\n", n)
+
+	return nil
+}

internal/database/migrations/1_initial.sql

@@ -0,0 +1,8 @@
+-- +migrate Up
+CREATE table users (
+  id INTEGER PRIMARY KEY,
+  name text NOT NULL
+);
+
+-- +migrate Down
+DROP TABLE users;