feat: Update project structure and configuration files

backend/database/database.go

@@ -0,0 +1,44 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+	"fmt"
+
+	"github.com/go-jet/jet/v2/qrm"
+)
+
+//go:embed migrations/*
+var MigrationFS embed.FS
+
+type CtxDB struct{}
+
+func FromContext(ctx context.Context, db *sql.DB) qrm.DB {
+	if tx, ok := ctx.Value(CtxDB{}).(*sql.Tx); ok {
+		return tx
+	}
+	return db
+}
+
+func Truncate(ctx context.Context, db *sql.DB, tableName ...string) error {
+	for _, name := range tableName {
+		sql := fmt.Sprintf("TRUNCATE TABLE %s RESTART IDENTITY", name)
+		if _, err := db.ExecContext(ctx, sql); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func WrapLike(v string) string {
+	return "%" + v + "%"
+}
+
+func WrapLikeLeft(v string) string {
+	return "%" + v
+}
+
+func WrapLikeRight(v string) string {
+	return "%" + v
+}