Remove index

[Oxiang]

Problem

Now that the production database uses urls_combined_weighted_search_idx, urls_weighted_search_idx is obsolete and can be deleted.

The previous db migration script that was meant to create urls_combined_weighted_search_idx is unused as sequelize handles the index creation. The script can be remove as well.

Solution

• New db_migration script to delete urls_weighted_search_idx index
• Remove 20201202_add_combined_search_index migration script from codebase

[LoneRifle]

we don't usually remove scripts for migrations. lgtm otherwise.

[Oxiang]

we don't usually remove scripts for migrations. lgtm otherwise.

In this case we did not use the migration script at all, would leaving it in cause confusion?

[LoneRifle]

Ah, that's true. let me change it.