-- ============================================================
-- B8: 选择强度链接线 —— seedling/planting 挂 seed_lot_id（规格 §3.13）
-- ------------------------------------------------------------
-- 幂等。bre_seed_lot 表已由 bre_tables.sql 建好。
-- 链：seed_lot.seed_count → used_count(seedling 按出苗数累加) →
--     COUNT(seedling WHERE seed_lot_id) → COUNT(tree WHERE planting.seed_lot_id)
--     → COUNT(selection_result 入选)
-- ============================================================

ALTER TABLE bre_seedling ADD COLUMN IF NOT EXISTS seed_lot_id integer REFERENCES bre_seed_lot(id);
CREATE INDEX IF NOT EXISTS ix_bre_seedling_seed_lot_id ON bre_seedling (seed_lot_id);

ALTER TABLE bre_planting ADD COLUMN IF NOT EXISTS seed_lot_id integer REFERENCES bre_seed_lot(id);
CREATE INDEX IF NOT EXISTS ix_bre_planting_seed_lot_id ON bre_planting (seed_lot_id);