adjust employee

internal/database/migrations/20260309085123_alter_table_employee_kandangs.up.sql

@@ -0,0 +1,41 @@
+BEGIN;
+
+ALTER TABLE employee_kandangs
+    DROP CONSTRAINT IF EXISTS fk_employee_kandangs_kandang;
+
+ALTER TABLE employee_kandangs
+    DROP CONSTRAINT IF EXISTS uq_employee_kandangs;
+
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1
+        FROM employee_kandangs ek
+        LEFT JOIN kandangs k ON k.id = ek.kandang_id
+        WHERE k.kandang_group_id IS NULL
+    ) THEN
+        RAISE EXCEPTION 'Cannot migrate employee_kandangs: kandang_id has no kandang_group_id mapping';
+    END IF;
+END $$;
+
+UPDATE employee_kandangs ek
+SET kandang_id = k.kandang_group_id,
+    updated_at = NOW()
+FROM kandangs k
+WHERE k.id = ek.kandang_id;
+
+DELETE FROM employee_kandangs ek1
+USING employee_kandangs ek2
+WHERE ek1.id > ek2.id
+  AND ek1.employee_id = ek2.employee_id
+  AND ek1.kandang_id = ek2.kandang_id;
+
+ALTER TABLE employee_kandangs
+    ADD CONSTRAINT fk_employee_kandangs_kandang
+        FOREIGN KEY (kandang_id) REFERENCES kandang_groups (id)
+            ON DELETE CASCADE;
+
+ALTER TABLE employee_kandangs
+    ADD CONSTRAINT uq_employee_kandangs UNIQUE (employee_id, kandang_id);
+
+COMMIT;