chore: add twt_mentions table

feed.go

@@ -605,14 +605,25 @@ func chunk(args []any, qry func(int) (string, int), maxArgs int) iter.Seq2[strin
 }
 
 func refreshLastTwt(ctx context.Context, db db) error {
-	_, err := db.ExecContext(ctx, `
+	qry := `
+	delete from last_twt_on;
 	insert into last_twt_on
 		select
 			feed_id,
 			max(strftime('%Y-%m-%dT%H:%M:%fZ', (substring(text, 1, instr(text, '	')-1)))) last_twt_on
 		from twts
 		group by feed_id
-	on conflict do update set last_twt_on = excluded.last_twt_on;
-`)
+	on conflict(feed_id) do update set last_twt_on = excluded.last_twt_on;
+	delete from twt_mentions;
+	insert into twt_mentions select ulid, unhex(replace(trim(value,'{}'),'-','')) feed_id from twts, json_each(mentions);
+	`
+	var err error
+	for _, stmt := range strings.Split(qry, ";") {
+		_, err = db.ExecContext(ctx, stmt)
+		if err != nil {
+			return err
+		}
+	}
+
 	return err
 }

init.sql

@@ -31,3 +31,11 @@ create table if not exists last_twt_on(
 ); 
 
 CREATE INDEX if not exists twt_time on twts (ulid asc);
+
+create table if not exists twt_mentions(
+	feed_id blob,
+	ulid blob,
+	primary key (feed_id)
+); 
+
+CREATE INDEX if not exists twt_mention on twt_mentions (ulid asc);