feat: add container management functionality

db/queries/container.sql

@@ -0,0 +1,35 @@
+-- name: GetContainerByID :one
+SELECT * FROM containers
+WHERE id = sqlc.arg(id);
+
+-- name: ListContainers :many
+SELECT * FROM containers
+ORDER BY created_at DESC;
+
+-- name: CreateContainer :one
+INSERT INTO containers (shelf_id,name,container_type, description,max_capacity,metadata, created_at)
+VALUES (
+    sqlc.arg(shelf_id),
+    sqlc.arg(name),
+    sqlc.arg(container_type),
+    sqlc.arg(description),
+    sqlc.arg(max_capacity),
+    sqlc.arg(metadata),
+    sqlc.arg(created_at)
+)
+RETURNING *;
+
+-- name: UpdateContainer :one
+UPDATE containers
+SET name = CASE WHEN sqlc.arg(name) = '' THEN name ELSE sqlc.arg(name) END,
+    description = coalesce(sqlc.arg(description), description),
+    container_type = coalesce(sqlc.narg(container_type), container_type),
+    max_capacity = coalesce(sqlc.arg(max_capacity), max_capacity),
+    metadata = coalesce(sqlc.arg(metadata), metadata),
+    updated_at = sqlc.arg(updated_at)
+WHERE id = sqlc.arg(id)
+RETURNING *;
+
+-- name: DeleteContainer :execrows
+DELETE FROM containers
+WHERE id = sqlc.arg(id);