feat(repos): agents (+ tokens + caps), conversations, messages

lib/db/repos/messages.js

@@ -0,0 +1,18 @@
+import { pool } from '../pool.js';
+
+export async function append(conversation_id, { role, body, agent_id, metadata }) {
+  const { rows: [r] } = await pool.query(
+    `INSERT INTO messages(conversation_id, role, body, agent_id, metadata)
+     VALUES($1,$2,$3,$4,$5) RETURNING *`,
+    [conversation_id, role, body, agent_id || null, metadata || {}]
+  );
+  return r;
+}
+
+export async function listByConversation(conversation_id, { limit = 1000 } = {}) {
+  const { rows } = await pool.query(
+    `SELECT * FROM messages WHERE conversation_id=$1 ORDER BY created_at LIMIT $2`,
+    [conversation_id, limit]
+  );
+  return rows;
+}