⚡ Bolt: Add db indexes to optimize db queries

[thalesraymond]

What: Add missing db indexes.
Why: Prevent O(N) queries during high volume webhook bursts.
Impact: Queries use O(1) indexes.
Measurement: verify with explain plan.

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PR created automatically by Jules for task 13279910847911701755 started by @thalesraymond

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[gemini-code-assist]

Code Review

This pull request implements MongoDB indexes for the release_items, mobile_releases, and release_calendars collections to optimize query performance and updates the project's learning documentation. The review identifies a potential race condition where the database instance is exposed before indexes are fully built and suggests refactoring custom id fields to use MongoDB's native _id for better consistency.

[gemini-code-assist]

The use of a custom id field as a primary identifier violates the general rule of using MongoDB's native _id field. While adding a unique index here improves performance, the architecture should ideally be refactored to use _id for consistency and to leverage MongoDB's default indexing. This also applies to the id indexes on lines 55 and 61.

References

1. When mapping a MongoDB document to an entity, use doc._id for the primary key, not doc.id, to align with MongoDB conventions.

[gemini-code-assist]

There is a race condition in the database initialization. Since this.db is assigned before this Promise.all (at line 40), subsequent calls to getDb() will return the database instance immediately. This allows queries to be executed against the collections before these indexes are finished building, potentially causing performance issues during the initial burst of webhooks. Consider ensuring indexes are created before the database instance is made available to other components.