(TP-111) feat: add indexes to favourites table

Author: Kattsyn

rentplace/src/main/resources/db/migration/V202505090054__favourites_init.sql

@@ -5,4 +5,7 @@ create table favourites
     PRIMARY KEY (user_id, property_id),
     FOREIGN KEY (user_id) references users (user_id) ON DELETE CASCADE,
     FOREIGN KEY (property_id) references properties (property_id) ON DELETE CASCADE
-)
+);
+
+CREATE INDEX idx_favourites_property ON favourites (property_id);
+CREATE INDEX idx_favourites_user ON favourites (user_id);