feat(workbench): persist operational workflows and events

app/infra/db/postgresql/task_alerts.py

@@ -6,6 +6,7 @@ from contextlib import asynccontextmanager
 from psycopg import AsyncConnection
 from psycopg.errors import UndefinedTable
 from psycopg.types.json import Jsonb
+from uuid import uuid4
 
 from app.domain.domain_errors import DomainError
 
@@ -86,3 +87,21 @@ class TaskAlertRepository:
                 Jsonb({key: value for key, value in state.items() if key != "revision"}),
             ),
         )
+
+    async def append_changed_event(self, state: dict) -> None:
+        cursor = await self.connection.execute(
+            """INSERT INTO workbench.domain_event_log
+               (project_id,event_id,topic,aggregate_type,aggregate_id,
+                aggregate_revision,occurred_at,metadata)
+               VALUES (%s,%s,'workbench.alert.changed','workbench_alert',%s,%s,%s,%s)
+               RETURNING event_seq""",
+            (
+                self.project_id, uuid4(), state["alert_id"], state["revision"],
+                state["updated_at"], Jsonb({"alert_id": state["alert_id"]}),
+            ),
+        )
+        row = await cursor.fetchone()
+        await self.connection.execute(
+            "SELECT pg_notify('workbench_events', %s)",
+            (f'{self.project_id}:{row["event_seq"]}',),
+        )