feat(core): Add mysql pool size and increase it for CI (no-changelog) (#19347)

packages/@n8n/config/src/configs/database.config.ts

@@ -113,6 +113,10 @@ class MysqlConfig {
 	/** MySQL database user */
 	@Env('DB_MYSQLDB_USER')
 	user: string = 'root';
+
+	/** MySQL connection pool size */
+	@Env('DB_MYSQLDB_POOL_SIZE')
+	poolSize: number = 10;
 }
 
 @Config

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

@@ -69,6 +69,7 @@ describe('GlobalConfig', () => {
 				password: '',
 				port: 3306,
 				user: 'root',
+				poolSize: 10,
 			},
 			postgresdb: {
 				database: 'n8n',

packages/@n8n/db/src/connection/__tests__/db-connection-options.test.ts

@@ -157,6 +157,7 @@ describe('DbConnectionOptions', () => {
 					port: 3306,
 					user: 'root',
 					password: 'password',
+					poolSize: 10,
 				};
 			});
 
@@ -175,6 +176,7 @@ describe('DbConnectionOptions', () => {
 					password: 'password',
 					migrations: mysqlMigrations,
 					timezone: 'Z',
+					poolSize: 10,
 				});
 			});
 
@@ -193,6 +195,7 @@ describe('DbConnectionOptions', () => {
 					password: 'password',
 					migrations: mysqlMigrations,
 					timezone: 'Z',
+					poolSize: 10,
 				});
 			});
 		});

packages/@n8n/db/src/connection/db-connection-options.ts

@@ -135,10 +135,12 @@ export class DbConnectionOptions {
 	}
 
 	private getMysqlConnectionOptions(dbType: 'mariadb' | 'mysqldb'): MysqlConnectionOptions {
+		const { mysqldb: mysqlConfig } = this.config;
 		return {
 			type: dbType === 'mysqldb' ? 'mysql' : 'mariadb',
 			...this.getCommonOptions(),
 			...this.getOverrides('mysqldb'),
+			poolSize: mysqlConfig.poolSize,
 			migrations: mysqlMigrations,
 			timezone: 'Z', // set UTC as default
 		};