Add entity stats fields (#41)

[kacperzuk-neti]

GitHub keywords to close any associated issues

Motivation

Why we should merge these changes. If using GitHub keywords to close issues, this is optional as the motivation can be read on the issue page.

Changelog

Enhancements

Things you added that don't break anything. Regression tests for Bug Fixes count as Enhancements.

Bug Fixes

Things you changed that fix bugs. If it fixes a bug but, in so doing, adds a new requirement, removes code, or requires a database reset and reindex, the breaking part of the change should also be added to "Incompatible Changes" below.

Incompatible Changes

Things you broke while doing Enhancements and Bug Fixes. Breaking changes include (1) adding new requirements and (2) removing code. Renaming counts as (2) because a rename is a removal followed by an add.

Upgrading

If you have any Incompatible Changes in the above Changelog, outline how users of prior versions can upgrade once this PR lands or when reviewers are testing locally. A common upgrading step is "Database reset and re-index required".

Checklist for your Pull Request (PR)

• I verified this PR does not break any public APIs, contracts, or interfaces that external consumers depend on.
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I updated documentation if needed:
  • General docs: submitted PR to docs repository.
  • ENV vars: updated env vars list and set version parameter to master.
  • Deprecated vars: added to deprecated env vars list.
• If I modified API endpoints, I updated the Swagger/OpenAPI schemas accordingly and checked that schemas are asserted in tests.
• If I added new DB indices, I checked, that they are not redundant, with PGHero or other tools.
• If I added/removed chain type, I modified the Github CI matrix and PR labels accordingly.