## Description In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157481+ we added the new columns to the `packages_conan_metadata` table to save package settings. Afterwards it was noticed that conan package might have custom package settings that an user wants to save. ## Solution - Delete existing columns `os`, `architecture`, `build_type`, `compiler`, `compiler_version`, `compiler_libcxx` and `compiler_cppstd`. - Add new column `conan_info` of type [`jsonb`](https://www.postgresql.org/docs/current/datatype-json.html) to the `packages_conan_metadata` table in order to be able to save standard as well as custom package settings. - Add constraint to limit the length of column to `20_000` chars. This is what we already do for `packages_npm_metadata` [link](https://gitlab.com/gitlab-org/gitlab/-/blob/master/db/structure.sql#L14818). We can tweak the limit if necessary in the future.