user permissions

backend/migrations/20250718180903_create_user_warren_table.sql

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+CREATE TABLE user_warrens (
+	user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	warren_id UUID NOT NULL REFERENCES warrens(id) ON DELETE CASCADE,
+	can_create_children BOOLEAN NOT NULL,
+	can_list_files BOOLEAN NOT NULL,
+	can_read_files BOOLEAN NOT NULL,
+	can_modify_files BOOLEAN NOT NULL,
+	can_delete_files BOOLEAN NOT NULL,
+	can_delete_warren BOOLEAN NOT NULL,
+	PRIMARY KEY(user_id, warren_id)
+);