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glm-5.1 2b63cda1c7 Setup repo: migrate architecture specs, code stubs, and tasks from alkhub_ts

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document-mappings-valid-shapes

Document Valid Column Combinations for Mappings Table

completed

narrow

medium

component

implementation

Description

W20: The mappings table stores three conceptually different relationships in one table: session→spoke, session→parent session, session→task. All nullable FKs allow any combination, including invalid ones. The table name mappings doesn't convey what's mapped.

Document the valid column combinations (polymorphic association shapes): sessionId always NOT NULL; taskId only for task-scoped mappings; parentSessionId only for coordinator children. This makes it a polymorphic association table with documented shapes.

Acceptance Criteria

coordination.md documents valid column combinations (mapping shapes)
Shape 1: Session→Spoke (sessionId + spokeId, no taskId/parentSessionId)
Shape 2: Session→Parent (sessionId + parentSessionId, no taskId)
Shape 3: Session→Task (sessionId + taskId, no parentSessionId)
Invalid combinations documented (e.g., taskId + parentSessionId on same row)
sessionId noted as always NOT NULL for any mapping

References

docs/reviews/storage-architecture-review-2026-04-21.md#W20
docs/architecture/storage/coordination.md:10-27

Notes

To be filled by implementation agent

Summary

To be filled on completion

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