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

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

packages/@n8n/api-types/src/frontend-settings.ts

@@ -81,6 +81,10 @@ export interface FrontendSettings {
 		disableSessionRecording: boolean;
 		debug: boolean;
 	};
+	dataTables: {
+		maxSize: number;
+		warningThreshold: number;
+	};
 	personalizationSurveyEnabled: boolean;
 	defaultLocale: string;
 	userManagement: IUserManagementSettings;

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;
+}

packages/@n8n/config/src/index.ts

@@ -5,6 +5,7 @@ import { AiConfig } from './configs/ai.config';
 import { AuthConfig } from './configs/auth.config';
 import { CacheConfig } from './configs/cache.config';
 import { CredentialsConfig } from './configs/credentials.config';
+import { DataTableConfig } from './configs/data-table.config';
 import { DatabaseConfig } from './configs/database.config';
 import { DeploymentConfig } from './configs/deployment.config';
 import { DiagnosticsConfig } from './configs/diagnostics.config';
@@ -209,4 +210,7 @@ export class GlobalConfig {
 
 	@Nested
 	ai: AiConfig;
+
+	@Nested
+	dataTable: DataTableConfig;
 }

packages/@n8n/config/test/config.test.ts

@@ -52,6 +52,11 @@ describe('GlobalConfig', () => {
 		ssl_key: '',
 		ssl_cert: '',
 		editorBaseUrl: '',
+		dataTable: {
+			maxSize: 100 * 1024 * 1024,
+			warningThreshold: 95 * 1024 * 1024,
+			sizeCheckCacheDuration: 5000,
+		},
 		database: {
 			logging: {
 				enabled: false,