perf: add external_id index on users table

[v0idpwn]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro

Run ID: 6ea988fa-bd17-4b01-99f5-6140aa2836cf

📥 Commits

Reviewing files that changed from the base of the PR and between be386e7 and 91f6563.

📒 Files selected for processing (1)

• priv/repo/migrations/20260307125522_add_users_tenant_external_id_index.exs

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Database optimization: Added indexing to enhance query performance and improve system efficiency.

Walkthrough

A new Ecto migration module is introduced that creates a concurrent index on the tenant_external_id column of the users table in the _supavisor schema. The migration uses create_if_not_exists to ensure idempotency, disables default DDL transaction handling, and executes with the concurrently: true option to avoid locking during index creation.

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