feat(dataset-groups): CRUD, latest-in-group, group SLD with dataset fallback, CreateRasterFromFile

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

internal/domain/dataset_group.go

@@ -0,0 +1,23 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// DatasetGroup groups "одноимённые" datasets (the same indicator delivered for
+// different periods). The freshest dataset of a group is the one with the
+// greatest end_date. A group may carry a shared SLD style used as a fallback by
+// datasets that have none of their own.
+type DatasetGroup struct {
+	ID             uuid.UUID `json:"id"`
+	Code           string    `json:"code"`
+	Name           string    `json:"name"`
+	Description    string    `json:"description"`
+	SldStorageKey  *string   `json:"sld_storage_key"`
+	SldFilename    *string   `json:"sld_filename"`
+	SldContentType *string   `json:"sld_content_type"`
+	CreatedAt      time.Time `json:"created_at"`
+	UpdatedAt      time.Time `json:"updated_at"`
+}