feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

app/models/message.go

@@ -0,0 +1,48 @@
+package models
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+
+	"rsgit.ru/rsmon/rsmon/app/models/concerns"
+)
+
+// Message info about performed notification
+type Message struct {
+	concerns.Model
+
+	NotificationID int64         `json:"notification_id"`
+	Notification   *Notification `json:"notification,omitempty"`
+
+	ContactID int64    `gorm:"index;type:bigint REFERENCES contacts(id)" json:"contact_id"`
+	Contact   *Contact `json:"contact,omitempty"`
+
+	// Events are for up/down messages
+	Events []Event `json:"events" gorm:"many2many:event_messages;"`
+
+	// Checks are for expires messages
+	CheckID *int64 `gorm:"index;type:bigint REFERENCES checks(id)" json:"check_id"`
+	Check   *Check `json:"check,omitempty"`
+
+	Kind     string  `json:"kind"`
+	State    string  `json:"state"`
+	Error    *string `json:"error"`
+	Response *string `json:"response"`
+	Tries    int     `json:"-"`
+
+	CreatedAt time.Time `json:"created_at"`
+	SentAt    time.Time `json:"sent_at"`
+}
+
+// MessageScope provides functionality.
+func MessageScope(q *gorm.DB) *gorm.DB {
+	return q.
+		Preload("Events").
+		Preload("Events.Checks").
+		Preload("Events.Monitor").
+		Preload("Notification").
+		Preload("Contact").
+		Preload("Check").
+		Preload("Check.Monitor")
+}