fix: dispose races, tunnel guards, retry on stale

test/unit/db/mysql.test.ts

@@ -84,6 +84,7 @@ vi.mock('mysql2/promise', () => ({
 }))
 
 import type { ConnectionConfig } from '../../../src/config/types.js'
+import { DriverDisposedError } from '../../../src/db/driver.js'
 import { createMysqlDriver } from '../../../src/db/mysql.js'
 
 const config = (extra: Partial<ConnectionConfig> = {}): ConnectionConfig => ({
@@ -314,4 +315,22 @@ describe('createMysqlDriver', () => {
         await driver.dispose()
         expect(mysqlState.state.pools.every((pool) => pool.ended)).toBe(true)
     })
+
+    it('rejects queries after dispose with DriverDisposedError', async () => {
+        const driver = createMysqlDriver(target())
+        await driver.query({ sql: 'select 1', rowLimit: 1 })
+        await driver.dispose()
+        await expect(driver.query({ sql: 'select 1', rowLimit: 1 })).rejects.toBeInstanceOf(
+            DriverDisposedError
+        )
+    })
+
+    it('dispose racing a query creates no new pool into the cleared map', async () => {
+        const driver = createMysqlDriver(target())
+        const disposing = driver.dispose()
+        const racing = driver.query({ sql: 'select 1', database: 'late', rowLimit: 1 })
+        await disposing
+        await expect(racing).rejects.toBeInstanceOf(DriverDisposedError)
+        expect(mysqlState.state.pools).toHaveLength(0)
+    })
 })