How easy is it to update all links to a site?

Question

Search Engine Optimization

Good afternoon! There is one old site with TIC 10, about 200 pages in the search. I want to rewrite it using a modern framework, and this raises the question of indexing - after all, the index contains old urls, with a not very convenient look, if I rewrite the site, then all these urls will become irrelevant. I'm afraid that the site will sag in the search, how to correctly solve this problem?

Answer 1

Make a 301 redirect

Answer 2

Write a script for transferring pages to a new database and save the old URL in a separate field, then check if this field is filled in the new database, if it is, do a php redirect from the old to the current one.