feat: add components management functionality

db/queries/component.sql

@@ -0,0 +1,36 @@
+-- name: GetComponentByID :one
+SELECT * FROM components
+WHERE id = sqlc.arg(id);
+
+-- name: ListComponents :many
+SELECT * FROM components
+ORDER BY created_at DESC;
+
+-- name: CreateComponent :one
+INSERT INTO components (component_type_id,name, description,unit,min_quantity,metadata, created_at)
+VALUES (
+    sqlc.arg(component_type_id),
+    sqlc.arg(name),
+    sqlc.arg(description),
+    sqlc.arg(unit),
+    sqlc.arg(min_quantity),
+    sqlc.arg(metadata),
+    sqlc.arg(created_at)
+)
+RETURNING *;
+
+-- name: UpdateComponent :one
+UPDATE components
+SET name = CASE WHEN sqlc.arg(name) = '' THEN name ELSE sqlc.arg(name) END,
+    component_type_id = coalesce(sqlc.arg(component_type_id), component_type_id),
+    description = coalesce(sqlc.arg(description), description),
+    unit = coalesce(sqlc.arg(unit), unit),
+    min_quantity = coalesce(sqlc.arg(min_quantity), min_quantity),
+    metadata = coalesce(sqlc.arg(metadata), metadata),
+    updated_at = sqlc.arg(updated_at)
+WHERE id = sqlc.arg(id)
+RETURNING *;
+
+-- name: DeleteComponent :execrows
+DELETE FROM components
+WHERE id = sqlc.arg(id);