chore: commit workspace updates

backend/internal/model/cloud_agent.go

@@ -0,0 +1,39 @@
+package model
+
+import "time"
+
+// CloudAgentExecution checkpoints orchestration independently of billed tasks.
+type CloudAgentExecution struct {
+	ID       string `gorm:"primaryKey;size:80"`
+	UserID   string `gorm:"index;size:36"`
+	Status   string `gorm:"index;size:32"`
+	Revision int64
+	// Control fields remain writable even when the transcript cannot be decoded or saved.
+	CanvasID       string `gorm:"size:80"`
+	ActiveTaskID   string `gorm:"size:80"`
+	MediaTaskID    string `gorm:"size:80"`
+	CleanupPending bool   `gorm:"not null;default:false;index"`
+	FailureMessage string `gorm:"size:1000"`
+	StateJSON      string `gorm:"type:text"`
+	CreatedAt      time.Time
+	UpdatedAt      time.Time
+}
+
+// CloudAgentCanvasMutation records one atomic canvas change made by an Agent.
+// BeforeJSON is intentionally bounded by the application layer; mutations that
+// cannot retain a safe snapshot are marked not_undoable instead of truncating it.
+type CloudAgentCanvasMutation struct {
+	ID                 string     `json:"id" gorm:"primaryKey;size:80"`
+	RunID              string     `json:"runId" gorm:"index;size:80"`
+	UserID             string     `json:"userId" gorm:"index;size:36"`
+	CanvasID           string     `json:"canvasId" gorm:"index;size:80"`
+	StepID             string     `json:"stepId" gorm:"index;size:160"`
+	Operation          string     `json:"operation" gorm:"size:64"`
+	BeforeSnapshotHash string     `json:"beforeSnapshotHash" gorm:"size:64"`
+	AfterSnapshotHash  string     `json:"afterSnapshotHash" gorm:"size:64"`
+	BeforeJSON         string     `json:"-" gorm:"type:text"`
+	HasSubmittedTask   bool       `json:"hasSubmittedTask"`
+	Status             string     `json:"status" gorm:"index;size:24"`
+	CreatedAt          time.Time  `json:"createdAt" gorm:"index"`
+	UndoneAt           *time.Time `json:"undoneAt,omitempty"`
+}