fix(core): Update data table delete row endpoint to accept filter as string (no-changelog) (#19673)

packages/@n8n/api-types/src/dto/data-store/delete-data-table-rows.dto.ts

@@ -1,11 +1,64 @@
+import { jsonParse } from 'n8n-workflow';
 import { z } from 'zod';
 import { Z } from 'zod-class';
 
 import { dataTableFilterSchema } from '../../schemas/data-table-filter.schema';
 
+const dataTableFilterQueryValidator = z.string().transform((val, ctx) => {
+	if (!val) {
+		ctx.addIssue({
+			code: z.ZodIssueCode.custom,
+			message: 'Filter is required for delete operations',
+			path: ['filter'],
+		});
+		return z.NEVER;
+	}
+	try {
+		const parsed: unknown = jsonParse(val);
+		try {
+			// Parse with the schema which applies defaults
+			const result = dataTableFilterSchema.parse(parsed);
+			// Ensure filters array is not empty
+			if (!result.filters || result.filters.length === 0) {
+				ctx.addIssue({
+					code: z.ZodIssueCode.custom,
+					message: 'At least one filter condition is required for delete operations',
+					path: ['filter'],
+				});
+				return z.NEVER;
+			}
+			return result;
+		} catch (e) {
+			ctx.addIssue({
+				code: z.ZodIssueCode.custom,
+				message: 'Invalid filter fields',
+				path: ['filter'],
+			});
+			return z.NEVER;
+		}
+	} catch (e) {
+		ctx.addIssue({
+			code: z.ZodIssueCode.custom,
+			message: 'Invalid filter format',
+			path: ['filter'],
+		});
+		return z.NEVER;
+	}
+});
+
+const returnDataValidator = z
+	.union([z.string(), z.boolean()])
+	.optional()
+	.transform((val) => {
+		if (typeof val === 'string') {
+			return val === 'true';
+		}
+		return val ?? false;
+	});
+
 const deleteDataTableRowsShape = {
-	filter: dataTableFilterSchema.optional(),
-	returnData: z.boolean().optional().default(false),
+	filter: dataTableFilterQueryValidator,
+	returnData: returnDataValidator,
 };
 
 export class DeleteDataTableRowsDto extends Z.class(deleteDataTableRowsShape) {}