feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/worker_log_event.go

@@ -0,0 +1,31 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/datatypes"
+
+	"rsgit.ru/rsmon/rsmon/app/models/concerns"
+)
+
+// WorkerLogEvent stores critical log events sent by worker nodes. The same
+// payload may also be forwarded to VictoriaLogs; Postgres keeps a compact audit
+// copy so the control plane can show recent critical events even if external log
+// storage is temporarily unavailable.
+type WorkerLogEvent struct {
+	concerns.Model
+
+	WorkerID     int64          `gorm:"type:bigint REFERENCES worker_nodes(id) ON DELETE SET NULL;index" json:"worker_id"`
+	WorkerNodeID string         `gorm:"size:100;not null;index" json:"worker_node_id"`
+	ServerID     *int64         `gorm:"type:bigint REFERENCES servers(id) ON DELETE SET NULL;index" json:"server_id,omitempty"`
+	Level        string         `gorm:"size:16;not null;index" json:"level"`
+	Message      string         `gorm:"type:text;not null" json:"message"`
+	Source       string         `gorm:"size:64" json:"source"`
+	Payload      datatypes.JSON `gorm:"type:jsonb;not null;default:'{}'::jsonb" json:"payload"`
+	OccurredAt   time.Time      `gorm:"not null;index" json:"occurred_at"`
+
+	concerns.Timestamped
+}
+
+// TableName provides functionality.
+func (WorkerLogEvent) TableName() string { return "worker_log_events" }