fix(bot): lead race condition — INSERT OR IGNORE + reselect on UNIQUE conflict

- getOrCreateLead: INSERT OR IGNORE prevents UNIQUE constraint race (parallel messages creating same telegram_id lead)
- On changes=0, reselect existing lead instead of failing

src/services/leadService.js

@@ -47,7 +47,7 @@ export async function getOrCreateLead({ telegramId, username, name }) {
         }
 
         const result = await db.runAsync(
-            `INSERT INTO leads (telegram_id, telegram, name, status, verification, custom_fields, created_at, updated_at)
+            `INSERT OR IGNORE INTO leads (telegram_id, telegram, name, status, verification, custom_fields, created_at, updated_at)
              VALUES (?, ?, ?, 'new', 'pending', '{}', datetime('now'), datetime('now'))`,
             [
                 tid,
@@ -55,6 +55,13 @@ export async function getOrCreateLead({ telegramId, username, name }) {
                 name || null,
             ]
         );
+        if (result.changes === 0) {
+            // Конфликт: лид создан параллельным запросом — перечитываем
+            const row = await db.getAsync('SELECT id FROM leads WHERE telegram_id = ?', [tid]);
+            if (row) {
+                return { id: row.id, isNew: false };
+            }
+        }
         logger.info({ telegramId: tid, leadId: result.lastInsertRowid }, 'Lead created from bot interaction');
         return { id: Number(result.lastInsertRowid), isNew: true };
     } catch (err) {