🏗️(caldav) migrate from davical to sabre/dav

docker/sabredav/sql/pgsql.propertystorage.sql

@@ -0,0 +1,13 @@
+CREATE TABLE propertystorage (
+    id SERIAL NOT NULL,
+    path VARCHAR(1024) NOT NULL,
+    name VARCHAR(100) NOT NULL,
+    valuetype INT,
+    value BYTEA
+);
+
+ALTER TABLE ONLY propertystorage
+    ADD CONSTRAINT propertystorage_pkey PRIMARY KEY (id);
+
+CREATE UNIQUE INDEX propertystorage_ukey
+    ON propertystorage (path, name);