Move app to apps/web-react in pnpm workspace layout

apps/web-react/app/db/write-tracker.ts

@@ -0,0 +1,41 @@
+import type {
+	KyselyPlugin,
+	PluginTransformQueryArgs,
+	PluginTransformResultArgs,
+	QueryResult,
+	RootOperationNode,
+	UnknownRow,
+} from "kysely";
+
+let dirty = false;
+
+/**
+ * Records whether anything has been written to the database, so that a caller can
+ * react to writes it did not make itself: the vitest teardown wipes only when a
+ * test wrote something, and an e2e worker flushes the app server's caches only
+ * when its factories wrote something.
+ */
+export class WriteTrackerPlugin implements KyselyPlugin {
+	transformQuery(args: PluginTransformQueryArgs): RootOperationNode {
+		if (args.node.kind !== "SelectQueryNode") {
+			dirty = true;
+		}
+
+		return args.node;
+	}
+
+	async transformResult(
+		args: PluginTransformResultArgs,
+	): Promise<QueryResult<UnknownRow>> {
+		return args.result;
+	}
+}
+
+/** Whether the database has been written to since the last {@link markDatabaseClean}. */
+export function isDatabaseDirty() {
+	return dirty;
+}
+
+export function markDatabaseClean() {
+	dirty = false;
+}