feat: Enforce data-stores limits (no-changelog) (#19116)

Co-authored-by: Charlie Kolb <charlie@n8n.io>

packages/@n8n/config/src/configs/data-table.config.ts

@@ -0,0 +1,22 @@
+import { Config, Env } from '../decorators';
+
+@Config
+export class DataTableConfig {
+	/** Specifies the maximum allowed size (in bytes) for data tables. */
+	@Env('N8N_DATA_TABLES_MAX_SIZE_BYTES')
+	maxSize: number = 100 * 1024 * 1024;
+
+	/**
+	 * The percentage threshold at which a warning is triggered for data tables.
+	 * When the usage of a data table reaches or exceeds this value, a warning is issued.
+	 */
+	@Env('N8N_DATA_TABLES_WARNING_THRESHOLD_BYTES')
+	warningThreshold: number = 95 * 1024 * 1024;
+
+	/**
+	 * The duration in milliseconds for which the data table size is cached.
+	 * This prevents excessive database queries for size validation.
+	 */
+	@Env('N8N_DATA_TABLES_SIZE_CHECK_CACHE_DURATION_MS')
+	sizeCheckCacheDuration: number = 5 * 1000;
+}