Boot ran SeedPlans before Backfill, so the fresh (self_hosted, professional)
seed row was inserted before pass 3 tried to rename the legacy self_hosted TIER
row into it — colliding on deployment_tier_unique and failing boot.
The plan re-key moves to MigrateLegacyPlans, called before SeedPlans so the
rename lands first and the seed no-ops on it. It is also self-healing: on a
database a crashed boot already seeded (self_hosted, professional) into, the
legacy row can no longer be renamed onto it, so it is dropped instead — its
instances are re-tiered and re-entitled from the surviving professional row.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
mrhid6andClaude Opus 5
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