added filter handling to query.go and sort "created_by" descending

storage/postgresql/init.go

@@ -39,7 +39,7 @@ CREATE TABLE IF NOT EXISTS event (
 
 CREATE UNIQUE INDEX IF NOT EXISTS ididx ON event USING btree (id text_pattern_ops);
 CREATE INDEX IF NOT EXISTS pubkeyprefix ON event USING btree (pubkey text_pattern_ops);
-CREATE INDEX IF NOT EXISTS timeidx ON event (created_at);
+CREATE INDEX IF NOT EXISTS timeidx ON event (created_at DESC);
 CREATE INDEX IF NOT EXISTS kindidx ON event (kind);
 CREATE INDEX IF NOT EXISTS arbitrarytagvalues ON event USING gin (tagvalues);
     `)

storage/postgresql/query.go

@@ -128,11 +128,17 @@ func (b PostgresBackend) QueryEvents(filter *nostr.Filter) (events []nostr.Event
 		conditions = append(conditions, "true")
 	}
 
+	if filter.Limit < 1 || filter.Limit > 100 {
+		params = append(params, 100)
+	} else {
+		params = append(params, filter.Limit)
+	}
+
 	query := b.DB.Rebind(`SELECT
       id, pubkey, created_at, kind, tags, content, sig
     FROM event WHERE ` +
 		strings.Join(conditions, " AND ") +
-		" ORDER BY created_at LIMIT 100")
+		" ORDER BY created_at DESC LIMIT ?")
 
 	rows, err := b.DB.Query(query, params...)
 	if err != nil && err != sql.ErrNoRows {