list warrens + explore nested folders

backend/migrations/20250712021357_create_warren_table.sql

@@ -0,0 +1,7 @@
+CREATE TABLE warrens (
+	id UUID PRIMARY KEY DEFAULT GEN_RANDOM_UUID(),
+	path VARCHAR NOT NULL,
+	created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP 
+);
+
+CREATE INDEX idx_warrens_path ON warrens(path);