feat: Auto-migrations on startup, worker exit location, proxy improvements

- Add auto-migration system that runs SQL files from migrations/ on server startup
- Track applied migrations in schema_migrations table
- Show proxy exit location in Workers dashboard
- Add "Cleanup Stale" button to remove old workers
- Add remove button for individual workers
- Include proxy location (city, state, country) in worker heartbeats
- Update Proxy interface with location fields
- Re-enable bulk proxy import without ON CONFLICT

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/routes/proxies.ts

@@ -2,7 +2,7 @@ import { Router } from 'express';
 import { authMiddleware, requireRole } from '../auth/middleware';
 import { pool } from '../db/pool';
 import { testProxy, addProxy, addProxiesFromList } from '../services/proxy';
-import { createProxyTestJob, getProxyTestJob, getActiveProxyTestJob, cancelProxyTestJob } from '../services/proxyTestQueue';
+import { createProxyTestJob, getProxyTestJob, getActiveProxyTestJob, cancelProxyTestJob, ProxyTestMode } from '../services/proxyTestQueue';
 
 const router = Router();
 router.use(authMiddleware);
@@ -11,9 +11,10 @@ router.use(authMiddleware);
 router.get('/', async (req, res) => {
   try {
     const result = await pool.query(`
-      SELECT id, host, port, protocol, active, is_anonymous,
+      SELECT id, host, port, protocol, username, password, active, is_anonymous,
              last_tested_at, test_result, response_time_ms, created_at,
-             city, state, country, country_code, location_updated_at
+             city, state, country, country_code, location_updated_at,
+             COALESCE(max_connections, 1) as max_connections
       FROM proxies
       ORDER BY created_at DESC
     `);
@@ -166,13 +167,39 @@ router.post('/:id/test', requireRole('superadmin', 'admin'), async (req, res) =>
 });
 
 // Start proxy test job
+// Query params: mode=all|failed|inactive, concurrency=10
 router.post('/test-all', requireRole('superadmin', 'admin'), async (req, res) => {
   try {
-    const jobId = await createProxyTestJob();
-    res.json({ jobId, message: 'Proxy test job started' });
-  } catch (error) {
+    const mode = (req.query.mode as ProxyTestMode) || 'all';
+    const concurrency = parseInt(req.query.concurrency as string) || 10;
+
+    // Validate mode
+    if (!['all', 'failed', 'inactive'].includes(mode)) {
+      return res.status(400).json({ error: 'Invalid mode. Use: all, failed, or inactive' });
+    }
+
+    // Validate concurrency (1-50)
+    if (concurrency < 1 || concurrency > 50) {
+      return res.status(400).json({ error: 'Concurrency must be between 1 and 50' });
+    }
+
+    const jobId = await createProxyTestJob(mode, concurrency);
+    res.json({ jobId, mode, concurrency, message: `Proxy test job started (mode: ${mode}, concurrency: ${concurrency})` });
+  } catch (error: any) {
     console.error('Error starting proxy test job:', error);
-    res.status(500).json({ error: 'Failed to start proxy test job' });
+    res.status(500).json({ error: error.message || 'Failed to start proxy test job' });
+  }
+});
+
+// Convenience endpoint: Test only failed proxies
+router.post('/test-failed', requireRole('superadmin', 'admin'), async (req, res) => {
+  try {
+    const concurrency = parseInt(req.query.concurrency as string) || 10;
+    const jobId = await createProxyTestJob('failed', concurrency);
+    res.json({ jobId, mode: 'failed', concurrency, message: 'Retesting failed proxies...' });
+  } catch (error: any) {
+    console.error('Error starting failed proxy test:', error);
+    res.status(500).json({ error: error.message || 'Failed to start proxy test job' });
   }
 });
 
@@ -197,8 +224,8 @@ router.post('/test-job/:jobId/cancel', requireRole('superadmin', 'admin'), async
 router.put('/:id', requireRole('superadmin', 'admin'), async (req, res) => {
   try {
     const { id } = req.params;
-    const { host, port, protocol, username, password, active } = req.body;
-    
+    const { host, port, protocol, username, password, active, max_connections } = req.body;
+
     const result = await pool.query(`
       UPDATE proxies
       SET host = COALESCE($1, host),
@@ -207,10 +234,11 @@ router.put('/:id', requireRole('superadmin', 'admin'), async (req, res) => {
           username = COALESCE($4, username),
           password = COALESCE($5, password),
           active = COALESCE($6, active),
+          max_connections = COALESCE($7, max_connections),
           updated_at = CURRENT_TIMESTAMP
-      WHERE id = $7
+      WHERE id = $8
       RETURNING *
-    `, [host, port, protocol, username, password, active, id]);
+    `, [host, port, protocol, username, password, active, max_connections, id]);
     
     if (result.rows.length === 0) {
       return res.status(404).json({ error: 'Proxy not found' });