graph(create annotation): add initial annotation_category table

pkg/services/sqlstore/migrations/annotation_category_mig.go

+package migrations
+
+import (
+	. "github.com/grafana/grafana/pkg/services/sqlstore/migrator"
+)
+
+func addAnnotationCategoryMig(mg *Migrator) {
+	category := Table{
+		Name: "annotation_category",
+		Columns: []*Column{
+			{Name: "id", Type: DB_BigInt, IsPrimaryKey: true, IsAutoIncrement: true},
+			{Name: "org_id", Type: DB_BigInt, Nullable: false},
+			{Name: "user_id", Type: DB_BigInt, Nullable: true},
+			{Name: "name", Type: DB_Text, Nullable: false},
+		},
+		Indices: []*Index{
+			{Cols: []string{"org_id", "name"}, Type: IndexType},
+		},
+	}
+
+	// create table
+	mg.AddMigration("create annotation_category table", NewAddTableMigration(category))
+
+	// create indices
+	mg.AddMigration("add index org_id & name", NewAddIndexMigration(category, category.Indices[0]))
+}

pkg/services/sqlstore/migrations/migrations.go

@@ -26,6 +26,7 @@ func AddMigrations(mg *Migrator) {
 	addAnnotationMig(mg)
 	addStatsMigrations(mg)
 	addTestDataMigrations(mg)
+	// addAnnotationCategoryMig(mg)
 }
 
 func addMigrationLogMigrations(mg *Migrator) {