fix vfs_db and add metadata_db

lib/vfs/vfs_db/model_directory_test.v

@@ -0,0 +1,136 @@
+module vfs_db
+
+import freeflowuniverse.herolib.vfs
+
+fn test_directory_get_metadata() {
+	// Create a directory with metadata
+	metadata := vfs.Metadata{
+		id: 1
+		name: 'test_dir'
+		file_type: .directory
+		size: 0
+		mode: 0o755
+		owner: 'user'
+		group: 'user'
+		created: 0
+		modified: 0
+	}
+	
+	dir := Directory{
+		metadata: metadata
+		children: []
+		parent_id: 0
+	}
+	
+	// Test get_metadata
+	retrieved_metadata := dir.get_metadata()
+	assert retrieved_metadata.id == 1
+	assert retrieved_metadata.name == 'test_dir'
+	assert retrieved_metadata.file_type == .directory
+	assert retrieved_metadata.size == 0
+	assert retrieved_metadata.mode == 0o755
+	assert retrieved_metadata.owner == 'user'
+	assert retrieved_metadata.group == 'user'
+}
+
+fn test_directory_get_path() {
+	// Create a directory with metadata
+	metadata := vfs.Metadata{
+		id: 1
+		name: 'test_dir'
+		file_type: .directory
+		size: 0
+		mode: 0o755
+		owner: 'user'
+		group: 'user'
+		created: 0
+		modified: 0
+	}
+	
+	dir := Directory{
+		metadata: metadata
+		children: []
+		parent_id: 0
+	}
+	
+	// Test get_path
+	path := dir.get_path()
+	assert path == 'test_dir'
+}
+
+fn test_directory_is_dir() {
+	// Create a directory with metadata
+	metadata := vfs.Metadata{
+		id: 1
+		name: 'test_dir'
+		file_type: .directory
+		size: 0
+		mode: 0o755
+		owner: 'user'
+		group: 'user'
+		created: 0
+		modified: 0
+	}
+	
+	dir := Directory{
+		metadata: metadata
+		children: []
+		parent_id: 0
+	}
+	
+	// Test is_dir
+	assert dir.is_dir() == true
+	assert dir.is_file() == false
+	assert dir.is_symlink() == false
+}
+
+fn test_directory_with_children() {
+	// Create a directory with children
+	metadata := vfs.Metadata{
+		id: 1
+		name: 'parent_dir'
+		file_type: .directory
+		size: 0
+		mode: 0o755
+		owner: 'user'
+		group: 'user'
+		created: 0
+		modified: 0
+	}
+	
+	dir := Directory{
+		metadata: metadata
+		children: [u32(2), 3, 4]
+		parent_id: 0
+	}
+	
+	// Test children
+	assert dir.children.len == 3
+	assert dir.children[0] == 2
+	assert dir.children[1] == 3
+	assert dir.children[2] == 4
+}
+
+fn test_directory_with_parent() {
+	// Create a directory with a parent
+	metadata := vfs.Metadata{
+		id: 2
+		name: 'child_dir'
+		file_type: .directory
+		size: 0
+		mode: 0o755
+		owner: 'user'
+		group: 'user'
+		created: 0
+		modified: 0
+	}
+	
+	dir := Directory{
+		metadata: metadata
+		children: []
+		parent_id: 1
+	}
+	
+	// Test parent_id
+	assert dir.parent_id == 1
+}