feat(api): add M5 coverage controls and frontend spec

backend/command-api/sql/v2/007_v2_staff_blocks_and_benefit_history.sql

@@ -0,0 +1,41 @@
+CREATE TABLE IF NOT EXISTS staff_blocks (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+  business_id UUID NOT NULL REFERENCES businesses(id) ON DELETE CASCADE,
+  staff_id UUID NOT NULL REFERENCES staffs(id) ON DELETE CASCADE,
+  created_by_user_id TEXT REFERENCES users(id) ON DELETE SET NULL,
+  reason TEXT,
+  issue_flags JSONB NOT NULL DEFAULT '[]'::jsonb,
+  metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS idx_staff_blocks_business_staff
+  ON staff_blocks (business_id, staff_id);
+
+CREATE INDEX IF NOT EXISTS idx_staff_blocks_business_created_at
+  ON staff_blocks (business_id, created_at DESC);
+
+CREATE TABLE IF NOT EXISTS staff_benefit_history (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  tenant_id UUID NOT NULL REFERENCES tenants(id) ON DELETE CASCADE,
+  staff_id UUID NOT NULL REFERENCES staffs(id) ON DELETE CASCADE,
+  benefit_id UUID REFERENCES staff_benefits(id) ON DELETE SET NULL,
+  benefit_type TEXT NOT NULL,
+  title TEXT NOT NULL,
+  status TEXT NOT NULL DEFAULT 'ACTIVE',
+  effective_at TIMESTAMPTZ NOT NULL,
+  ended_at TIMESTAMPTZ,
+  tracked_hours INTEGER NOT NULL DEFAULT 0,
+  target_hours INTEGER,
+  notes TEXT,
+  metadata JSONB NOT NULL DEFAULT '{}'::jsonb,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+CREATE INDEX IF NOT EXISTS idx_staff_benefit_history_staff_effective_at
+  ON staff_benefit_history (staff_id, effective_at DESC);
+
+CREATE INDEX IF NOT EXISTS idx_staff_benefit_history_tenant_benefit_type
+  ON staff_benefit_history (tenant_id, benefit_type, effective_at DESC);