server: WIP tantivy integration

server/sql/threads-from-uid.sql

@@ -0,0 +1,13 @@
+SELECT
+    site,
+    date,
+    is_read,
+    title,
+    uid,
+    name
+FROM
+    post p
+    JOIN feed f ON p.site = f.slug
+WHERE
+    uid = ANY ($1)
+;