Implement catchup mode

Show original/delivered To if no xinu.tv addresses in To/CC fields

server/src/graphql.rs

@@ -310,6 +310,40 @@ impl QueryRoot {
         info!("count {newsreader_query:?} newsreader count {newsreader_count} notmuch count {notmuch_count} tantivy count {tantivy_count} total {total}");
         Ok(total)
     }
+    async fn catchup<'ctx>(
+        &self,
+        ctx: &Context<'ctx>,
+        query: String,
+    ) -> Result<Vec<String>, Error> {
+        let nm = ctx.data_unchecked::<Notmuch>();
+        let pool = ctx.data_unchecked::<PgPool>();
+        let query: Query = query.parse()?;
+        // TODO: implement optimized versions of fetching just IDs
+        let newsreader_fut = newsreader_search(pool, None, None, None, None, &query);
+        let notmuch_fut = notmuch_search(nm, None, None, None, None, &query);
+        let (newsreader_results, notmuch_results) = join!(newsreader_fut, notmuch_fut);
+
+        let newsreader_results = newsreader_results?;
+        let notmuch_results = notmuch_results?;
+        info!(
+            "newsreader_results ({}) notmuch_results ({})",
+            newsreader_results.len(),
+            notmuch_results.len(),
+        );
+
+        let results: Vec<_> = newsreader_results
+            .into_iter()
+            .chain(notmuch_results)
+            .collect();
+        let ids = results
+            .into_iter()
+            .map(|r| match r {
+                ThreadSummaryCursor::Newsreader(_, ts) => ts.thread,
+                ThreadSummaryCursor::Notmuch(_, ts) => ts.thread,
+            })
+            .collect();
+        Ok(ids)
+    }
 
     // TODO: this function doesn't get parallelism, possibly because notmuch is sync and blocks,
     // rewrite that with tokio::process:Command