Jul 2nd - Optimized code 6

Claude.md

@@ -510,6 +510,8 @@ Migrations live in `migrations/versions/`. The chain is:
                     └── 004_widen_system_setting_value — system_settings.value VARCHAR(500) → TEXT
                           └── 005_add_watchers_and_time_entries — creates ticket_watchers
                                                                    and time_entries tables
+                                └── 006_add_sla_breach_notified — adds tickets.sla_breach_notified;
+                                                                   retires sla_notified_tickets setting
 ```
 
 **Rules:**
@@ -845,6 +847,7 @@ When an error is reported:
 | `003_render_comments` | Backfill comment bodies to HTML; widen `alembic_version.version_num` to `VARCHAR(64)` |
 | `004_widen_system_setting_value` | Widen `system_settings.value` from `VARCHAR(500)` to `TEXT` |
 | `005_add_watchers_and_time_entries` | Create `ticket_watchers` (UniqueConstraint + index) and `time_entries` (index) tables |
+| `006_add_sla_breach_notified` | Add `tickets.sla_breach_notified` boolean; backfill from and retire the `sla_notified_tickets` SystemSetting |
 
 ## 21. Browser Tab Notification Counter (added 2026-04-17)