feat: make Kafka projector the Workbench realtime authority

internal/db/runtime-store-postgres-notify.test.ts

@@ -0,0 +1,26 @@
+import assert from "node:assert/strict";
+import { EventEmitter } from "node:events";
+import { test } from "bun:test";
+
+import { subscribeWorkbenchProjectionCommits, WORKBENCH_PROJECTION_CHANNEL } from "./runtime-store-postgres-notify.ts";
+
+test("Postgres LISTEN fans committed projection scope out and releases its dedicated connection", async () => {
+  const queries = [];
+  let released = 0;
+  const client = new EventEmitter();
+  client.query = async (sql) => { queries.push(sql); return { rows: [] }; };
+  client.release = () => { released += 1; };
+  const pool = { async connect() { return client; } };
+  const store = { async getQueryClient() { return pool; }, logger: null };
+  const signals = [];
+
+  const unsubscribe = await subscribeWorkbenchProjectionCommits(store, (signal) => signals.push(signal));
+  assert.deepEqual(queries, [`LISTEN ${WORKBENCH_PROJECTION_CHANNEL}`]);
+
+  client.emit("notification", { channel: WORKBENCH_PROJECTION_CHANNEL, payload: JSON.stringify({ sessionId: "ses_notify", traceId: "trc_notify", outboxSeq: 12 }) });
+  assert.deepEqual(signals, [{ sessionId: "ses_notify", traceId: "trc_notify", outboxSeq: 12, valuesRedacted: true }]);
+
+  await unsubscribe();
+  assert.equal(queries.at(-1), `UNLISTEN ${WORKBENCH_PROJECTION_CHANNEL}`);
+  assert.equal(released, 1);
+});