feat: implement feed agg and browse

sql/schema/004_lastfetchedat.sql

@@ -0,0 +1,8 @@
+-- +goose Up
+ALTER TABLE feeds
+ADD COLUMN last_fetched_at TIMESTAMP NULL;
+
+-- +goose Down
+ALTER TABLE feeds
+DROP COLUMN last_fetched_at;
+

sql/schema/005_posts.sql

@@ -0,0 +1,16 @@
+-- +goose Up
+CREATE TABLE posts (
+  id UUID PRIMARY KEY,
+  created_at TIMESTAMP NOT NULL,
+  updated_at TIMESTAMP NOT NULL,
+  title TEXT NOT NULL,
+  url TEXT NOT NULL,
+  description TEXT NOT NULL,
+  published_at TIMESTAMP NULL,
+  feed_id UUID NOT NULL,
+  FOREIGN KEY(feed_id) REFERENCES feeds(id) ON DELETE CASCADE,
+  CONSTRAINT unique_url UNIQUE(url)
+);
+
+-- +goose Down
+DROP TABLE posts;