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

apps/web-react/app/db/empty-values-noop-plugin.ts

@@ -0,0 +1,58 @@
+import {
+	type InsertQueryNode,
+	type KyselyPlugin,
+	type PluginTransformQueryArgs,
+	type PluginTransformResultArgs,
+	type QueryResult,
+	RawNode,
+	type RootOperationNode,
+	SelectionNode,
+	SelectQueryNode,
+	type UnknownRow,
+	ValuesNode,
+	WhereNode,
+} from "kysely";
+
+/**
+ * Makes inserting an empty array of values a no-op instead of a syntax error.
+ * Kysely compiles `.values([])` into invalid SQL, so without this plugin every
+ * dynamic multi-row insert would need a length check before it. The empty
+ * insert is rewritten into `INSERT INTO "T" SELECT * FROM "T" WHERE 0` which
+ * inserts zero rows and returns zero rows for any `returning` clause.
+ */
+export class EmptyValuesNoopPlugin implements KyselyPlugin {
+	transformQuery(args: PluginTransformQueryArgs): RootOperationNode {
+		if (args.node.kind !== "InsertQueryNode" || !isEmptyInsert(args.node)) {
+			return args.node;
+		}
+
+		const { columns: _columns, ...node } = args.node;
+
+		return Object.freeze({
+			...node,
+			values: selectNothingFrom(args.node),
+		});
+	}
+
+	async transformResult(
+		args: PluginTransformResultArgs,
+	): Promise<QueryResult<UnknownRow>> {
+		return args.result;
+	}
+}
+
+function isEmptyInsert(node: InsertQueryNode) {
+	return (
+		node.values !== undefined &&
+		ValuesNode.is(node.values) &&
+		node.values.values.length === 0
+	);
+}
+
+function selectNothingFrom(node: InsertQueryNode): SelectQueryNode {
+	return Object.freeze({
+		...SelectQueryNode.createFrom([node.into!]),
+		selections: Object.freeze([SelectionNode.createSelectAll()]),
+		where: WhereNode.create(RawNode.createWithSql("0")),
+	});
+}