generate and save facts

database/lowdb.ts

@@ -7,6 +7,14 @@ export type Conversation = {
   userId: string;
 };
 
+export type Fact = {
+  id: string;
+  userId: string;
+  sourceMessageId: string;
+  content: string;
+  createdAt: string;
+};
+
 type DB = {
   conversations: Array<Conversation>;
   messages: Array<{
@@ -18,11 +26,13 @@ type DB = {
     createdAt: string;
     runningSummary?: string;
   }>;
+  facts: Array<Fact>;
 };
 
 export const db = new Low<DB>(new JSONFile("db.json"), {
   conversations: [],
   messages: [],
+  facts: [],
 });
 /** Initialize the database. Sets `db.data` to the default state if the file doesn't exist. */
 await db.read();