feat: add POST /notes/feed endpoint for multi-DID filtering

src/data/db.ts

@@ -49,6 +49,23 @@ export const getNotesByDid = (did: string, cursor?: string, limit = 20) => {
   };
 };
 
+export const getNotesByDids = (dids: string[], cursor?: string, limit = 20) => {
+  if (dids.length === 0) return { notes: [] };
+  const placeholders = dids.map(() => "?").join(", ");
+  const notes = cursor
+    ? db.prepare(
+      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) AND rkey < ? ORDER BY rkey DESC LIMIT ?`,
+    ).all<NoteRow>(...dids, cursor, limit)
+    : db.prepare(
+      `SELECT did, rkey, title, publishedAt, createdAt, language FROM note WHERE discoverable = 1 AND did IN (${placeholders}) ORDER BY rkey DESC LIMIT ?`,
+    ).all<NoteRow>(...dids, limit);
+
+  return {
+    notes,
+    cursor: notes.length === limit ? notes[notes.length - 1].rkey : undefined,
+  };
+};
+
 export const deleteNote = ({ did, rkey }: { did: string; rkey: string }) => {
   db.exec("DELETE FROM note WHERE did = ? AND rkey = ?", did, rkey);
 };