Bam Writer Service, Kobe API: Remove metrics table

[aoikurokawa]

No description provided.

[Copilot]

Pull request overview

This PR removes the BAM epoch metrics persistence and exposure from the codebase, eliminating the associated DB model/table usage and the public API endpoint that served it.

Changes:

• Removed the bam_epoch_metrics DB model/store from kobe_core and stopped writing epoch metrics from bam-writer-service.
• Deleted the BAM delegation criteria module (and its tests) that depended on epoch metrics history.
• Removed the /api/v1/bam_epoch_metrics API route, request/response schema, and resolver logic from kobe_api.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
core/src/db_models/mod.rs	Stops exporting the removed bam_epoch_metrics DB model module.
core/src/db_models/bam_epoch_metrics.rs	Deletes the epoch metrics model + MongoDB store implementation.
bam-writer-service/src/lib.rs	Removes epoch metrics persistence/allocation calculations; keeps only BAM validator upsert + datapoints.
bam-writer-service/src/bam_delegation_criteria.rs	Deletes the delegation allocation logic and unit tests that relied on epoch metrics.
api/src/schemas/mod.rs	Stops exporting the removed BAM epoch metrics schema module.
api/src/schemas/bam_epoch_metrics.rs	Deletes request/response schema for the removed endpoint.
api/src/resolvers/query_resolver.rs	Removes the cached wrapper + resolver method + store field for BAM epoch metrics.
api/src/main.rs	Removes the /api/v1/bam_epoch_metrics handler and route wiring.

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