Add SNMP monitor collection

worker/app/models.py

@@ -1,6 +1,6 @@
 from datetime import datetime
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, Integer, JSON, String, Text, func
+from sqlalchemy import Boolean, DateTime, Float, ForeignKey, Integer, JSON, String, Text, func
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
 
 
@@ -43,6 +43,27 @@ class CheckResult(Base):
     observed_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
 
 
+class Metric(Base):
+    __tablename__ = "metrics"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    monitor_id: Mapped[int] = mapped_column(ForeignKey("monitors.id", ondelete="CASCADE"))
+    name: Mapped[str] = mapped_column(String(120))
+    value: Mapped[float] = mapped_column(Float)
+    unit: Mapped[str | None] = mapped_column(String(32), nullable=True)
+    observed_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
+
+
+class Credential(Base):
+    __tablename__ = "credentials"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True)
+    name: Mapped[str] = mapped_column(String(160))
+    credential_type: Mapped[str] = mapped_column(String(64))
+    encrypted_secret: Mapped[str | None] = mapped_column(Text, nullable=True)
+    extra: Mapped[dict] = mapped_column("metadata", JSON, default=dict)
+
+
 class AlertRule(Base):
     __tablename__ = "alert_rules"