Give every user their own bot face

A bot's face and status line live in bot_user_faces, one row per bot and
user, set by jobs for the user whose conversation they're in. Needs-you
and working only show to that user; every bot read overlays the viewer's
face (botFaceSql) and pushes go to the user a face change is for.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/functions/backend/db/bots-queue/grab-job-user-id.ts

@@ -0,0 +1,22 @@
+import BunSQLite from "@moduletrace/bun-sqlite";
+import type { BUN_SQLITE_COBBLE_BOTS_QUEUE } from "@/db/types/db";
+import jobSessionId from "./job-session-id";
+
+type Params = {
+    job: Pick<BUN_SQLITE_COBBLE_BOTS_QUEUE, "session_id">;
+};
+
+/**
+ * The user a job works for: the one whose conversation it's in. Null once
+ * that conversation is gone.
+ */
+export default async function grabJobUserId({ job }: Params) {
+    const user_id = (
+        await BunSQLite.sql<{ user_id: number }>({
+            sql: `SELECT user_id FROM bot_sessions WHERE id = ? LIMIT 1`,
+            values: [jobSessionId({ job })],
+        })
+    ).payload?.[0]?.user_id;
+
+    return user_id ? Number(user_id) : null;
+}