feat: add event watcher

backend/src/utils/db/models.py

@@ -2,7 +2,7 @@ from datetime import datetime
 from enum import StrEnum
 from typing import Any
 
-from sqlalchemy import BigInteger, Column, DateTime, LargeBinary, func
+from sqlalchemy import BigInteger, Column, DateTime, LargeBinary, Text, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlmodel import Field, SQLModel
 
@@ -471,6 +471,7 @@ class Alert(SQLModel, table=True):
         default_factory=dict, sa_column=Column(JSONB, nullable=False)
     )
     seen: bool = False
+    dedup_key: str | None = Field(default=None, sa_column=Column(Text, nullable=True))
     created_at: datetime = Field(
         sa_column=Column(
             DateTime(timezone=True), nullable=False, server_default=func.now()