init add function command for create seed depretitaion standard

internal/database/migrations/20260531213223_add_project_flock_id_to_house_depreciation_standards.down.sql

@@ -0,0 +1,15 @@
+-- Hapus baris per-flock dulu supaya unique lama (house_type, day, effective_date)
+-- bisa dipulihkan tanpa konflik duplikat antar-flock.
+DELETE FROM house_depreciation_standards WHERE project_flock_id IS NOT NULL;
+
+DROP INDEX IF EXISTS idx_hds_project_flock_id;
+
+ALTER TABLE house_depreciation_standards
+    DROP CONSTRAINT house_depreciation_standards_htype_day_eff_pf_unique;
+
+ALTER TABLE house_depreciation_standards
+    DROP COLUMN project_flock_id;
+
+ALTER TABLE house_depreciation_standards
+    ADD CONSTRAINT house_depreciation_standards_house_type_day_eff_unique
+    UNIQUE (house_type, day, effective_date);

internal/database/migrations/20260531213223_add_project_flock_id_to_house_depreciation_standards.up.sql

@@ -0,0 +1,18 @@
+-- Tambah dimensi per-project-flock ke standar depresiasi.
+-- Baris dengan project_flock_id NON-NULL = kurva khusus flock tsb.
+-- Baris dengan project_flock_id NULL = kurva global default (fallback).
+ALTER TABLE house_depreciation_standards
+    ADD COLUMN project_flock_id BIGINT NULL REFERENCES project_flocks(id);
+
+-- Unique lama (house_type, day, effective_date) tidak bisa membedakan baris per-flock.
+-- Ganti agar menyertakan project_flock_id (NULL dianggap distinct di PostgreSQL,
+-- sehingga baris global lama tidak konflik dengan baris per-flock baru).
+ALTER TABLE house_depreciation_standards
+    DROP CONSTRAINT house_depreciation_standards_house_type_day_eff_unique;
+
+ALTER TABLE house_depreciation_standards
+    ADD CONSTRAINT house_depreciation_standards_htype_day_eff_pf_unique
+    UNIQUE (house_type, day, effective_date, project_flock_id);
+
+CREATE INDEX idx_hds_project_flock_id
+    ON house_depreciation_standards (project_flock_id);