feat: add invoice and alternative_componen management functionality

db/queries/alternative_component.sql

@@ -0,0 +1,35 @@
+-- name: GetAlternativeComponentByID :one
+SELECT * FROM alternative_components
+WHERE id = sqlc.arg(id);
+
+-- name: ListAlternativeComponents :many
+SELECT * FROM alternative_components;
+
+-- name: CreateAlternativeComponent :one
+INSERT INTO alternative_components (invoice_config_item_id, alternative_component_id, conversion_ratio, priority, note, metadata)
+VALUES (
+    sqlc.arg(invoice_config_item_id),
+    sqlc.arg(alternative_component_id),
+    sqlc.arg(conversion_ratio),
+    sqlc.arg(priority),
+    sqlc.arg(note),
+    sqlc.arg(metadata)
+)
+RETURNING *;
+
+-- name: UpdateAlternativeComponent :one
+UPDATE alternative_components
+SET invoice_config_item_id = coalesce(sqlc.arg(invoice_config_item_id), invoice_config_item_id),
+    alternative_component_id = coalesce(sqlc.arg(alternative_component_id), alternative_component_id),
+    conversion_ratio = coalesce(sqlc.arg(conversion_ratio), conversion_ratio),
+    priority = coalesce(sqlc.arg(priority), priority),
+    note = coalesce(sqlc.arg(note), note),
+    metadata = coalesce(sqlc.arg(metadata), metadata)
+WHERE id = sqlc.arg(id)
+RETURNING *;
+
+-- name: DeleteAlternativeComponent :execrows
+DELETE FROM alternative_components
+WHERE id = sqlc.arg(id);
+
+