Merge branch 'worktree-agent-acdb74a3'

packages/db/prisma/migrations/20260409_assignment_composite_indexes.sql

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+-- Migration: Add composite indexes on Assignment for capacity range queries
+
+CREATE INDEX IF NOT EXISTS "assignments_resourceId_status_endDate_idx" ON "assignments"("resourceId", "status", "endDate");
+CREATE INDEX IF NOT EXISTS "assignments_projectId_status_endDate_idx" ON "assignments"("projectId", "status", "endDate");

packages/db/prisma/migrations/20260409_assignment_demand_requirement_cascade.sql

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+-- Migration: Add SetNull cascade on Assignment → DemandRequirement FK
+-- When a DemandRequirement is deleted, assignments lose their reference but are not deleted.
+
+ALTER TABLE "assignments" DROP CONSTRAINT IF EXISTS "assignments_demandRequirementId_fkey";
+ALTER TABLE "assignments" ADD CONSTRAINT "assignments_demandRequirementId_fkey"
+  FOREIGN KEY ("demandRequirementId") REFERENCES "demand_requirements"("id")
+  ON DELETE SET NULL ON UPDATE CASCADE;