fix(core): Coerce BinaryDataConfig dbMaxFileSizeSchema to a number

packages/core/src/binary-data/__tests__/binary-data.config.test.ts

@@ -57,4 +57,42 @@ describe('BinaryDataConfig', () => {
 			expect.stringContaining('Invalid value for N8N_DEFAULT_BINARY_DATA_MODE'),
 		);
 	});
+
+	describe('dbMaxFileSize', () => {
+		it('should coerce string env variable to number', () => {
+			process.env.N8N_BINARY_DATA_DATABASE_MAX_FILE_SIZE = '1024';
+
+			const config = Container.get(BinaryDataConfig);
+
+			expect(config.dbMaxFileSize).toBe(1024);
+		});
+
+		it('should use default value when env variable is not set', () => {
+			const config = Container.get(BinaryDataConfig);
+
+			expect(config.dbMaxFileSize).toBe(512);
+		});
+
+		it('should fallback to default for invalid value', () => {
+			process.env.N8N_BINARY_DATA_DATABASE_MAX_FILE_SIZE = 'not-a-number';
+
+			const config = Container.get(BinaryDataConfig);
+
+			expect(config.dbMaxFileSize).toBe(512);
+			expect(console.warn).toHaveBeenCalledWith(
+				expect.stringContaining('Invalid value for N8N_BINARY_DATA_DATABASE_MAX_FILE_SIZE'),
+			);
+		});
+
+		it('should fallback to default when value exceeds maximum', () => {
+			process.env.N8N_BINARY_DATA_DATABASE_MAX_FILE_SIZE = '2048';
+
+			const config = Container.get(BinaryDataConfig);
+
+			expect(config.dbMaxFileSize).toBe(512);
+			expect(console.warn).toHaveBeenCalledWith(
+				expect.stringContaining('Invalid value for N8N_BINARY_DATA_DATABASE_MAX_FILE_SIZE'),
+			);
+		});
+	});
 });

packages/core/src/binary-data/binary-data.config.ts

@@ -14,7 +14,7 @@ const availableModesSchema = z
 	.transform((value) => value.split(','))
 	.pipe(binaryDataModesSchema.array());
 
-const dbMaxFileSizeSchema = z
+const dbMaxFileSizeSchema = z.coerce
 	.number()
 	.max(1024, 'Binary data max file size in `database` mode cannot exceed 1024 MiB'); // because of Postgres BYTEA hard limit