fix(webdav): RFC 4918 litmus compliance

migrations/20260825000000_webdav_dead_properties.sql

@@ -0,0 +1,20 @@
+-- WebDAV dead properties storage (RFC 4918 §9.2).
+-- Stores arbitrary user-defined XML properties set via PROPPATCH.
+-- Keyed by (resource_path, user_id, namespace, local_name) — the
+-- same property on different resources or for different users is
+-- a distinct row.
+
+CREATE TABLE IF NOT EXISTS storage.webdav_dead_properties (
+    id           UUID        NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+    resource_path TEXT       NOT NULL,
+    user_id      UUID        NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    namespace    TEXT        NOT NULL DEFAULT '',
+    local_name   TEXT        NOT NULL,
+    value        TEXT,
+    created_at   TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at   TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE (resource_path, user_id, namespace, local_name)
+);
+
+CREATE INDEX IF NOT EXISTS idx_webdav_dead_properties_path_user
+    ON storage.webdav_dead_properties (resource_path, user_id);