Deprecate reference based metadata store

[draftcode]

It's been a while since we migrated to a file-base metadata storage. We
can drop this refmeta code.

[aviator-app]

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Stack

1. 👉 Deprecate reference based metadata store #620 👈 (this pr)

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[aviator-app]

✅ FlexReview Status

Common Owner: aviator-co/engineering (expert-load-balance assignment)
Owner and Assignment:

• ✅ aviator-co/engineering (expert-load-balance assignment)
  • Slack: #av-slack-testing
  • Assigned: simsinght, tulioz
  Owned Files

  • 🔒 cmd/av/helpers.go
  • 🔒 internal/meta/refmeta/branch.go
  • 🔒 internal/meta/refmeta/import.go
  • 🔒 internal/meta/refmeta/repository.go

Review SLO: 7 business hours if PR size is <= 200 LOC for the first response.

[gemini-code-assist]

Summary of Changes

Hello @draftcode, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request finalizes the deprecation of the reference-based metadata storage system by completely removing the refmeta package and all associated migration logic. The project has successfully transitioned to a file-based metadata storage, making the old system obsolete. This change simplifies the codebase, removes dead code, and cleans up dependencies related to the legacy metadata handling.

Highlights

• Deprecation of refmeta package: The entire internal/meta/refmeta package, which was responsible for managing metadata stored directly within Git references, has been completely removed. This includes branch.go, import.go, and repository.go.
• Simplified Metadata Initialization: The getOrCreateDB function in cmd/av/helpers.go has been streamlined. It no longer contains the legacy logic for migrating metadata from the old repo-metadata.json (reference-based) to the current av.db (file-based) system, directly opening the jsonfiledb.
• Codebase Cleanup: Unused imports, specifically os (which was only needed for file system checks related to the old migration logic) and the refmeta package itself, have been removed from cmd/av/helpers.go.

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[gemini-code-assist]

Code Review

This pull request effectively removes the deprecated reference-based metadata store (refmeta). The changes are primarily deletions, which simplifies the codebase by removing the old migration logic from getOrCreateDB and the entire internal/meta/refmeta package. This is a good cleanup that improves maintainability. The changes are straightforward and correctly implement the goal of the pull request. I have no concerns with the proposed changes.