feat: implement feed agg and browse

sql/queries/feeds.sql

@@ -1,18 +1,28 @@
 -- name: CreateFeed :one
-INSERT INTO feeds (id, created_at, updated_at, name, url, user_id)
+INSERT INTO feeds (id, created_at, updated_at, name, url, user_id, last_fetched_at)
 VALUES (
   $1,
   $2,
   $3,
   $4,
   $5,
-  $6
+  $6,
+  $7
 )
 RETURNING *;
 
 -- name: GetAllFeeds :many
-SELECT id, created_at, updated_at, name, url, user_id FROM feeds;
+SELECT id, created_at, updated_at, name, url, user_id, last_fetched_at FROM feeds;
 
 -- name: GetFeedByUrl :one
-SELECT id, created_at, updated_at, name, url, user_id FROM feeds
+SELECT id, created_at, updated_at, name, url, user_id, last_fetched_at FROM feeds
 WHERE url = $1;
+
+-- name: GetNextFeedToFetch :one
+SELECT id, created_at, updated_at, name, url, user_id, last_fetched_at FROM feeds
+ORDER BY last_fetched_at ASC NULLS FIRST;
+
+-- name: MarkFeedAsFetched :exec
+UPDATE feeds
+SET last_fetched_at = $1
+WHERE feeds.id = $2;