Alerting: Add database migration for recording rule fields (#87012)

* Create recording rule fields in model

* Add migration

* Write to database, support in version table

* extend fingerprint

* Force fields to be empty on validate

* Another storage spot, tests for fingerprint

* Explicitly set defaults in provisioning API

* Tests for main API validation

* Add diff tests even though fields are unpopulated for now

* Use struct tag approach instead of FromDB/ToDB hooks as it better handles nulls when deserializing

* test for deser

* Backout RecordTo for now since it's not decided in the doc

* back out of migration too

* Drop datasourceref for now

* address linter complaints

* Try a single outer struct with all fields embedded

pkg/services/sqlstore/migrations/migrations.go

@@ -121,6 +121,8 @@ func (oss *OSSMigrations) AddMigration(mg *Migrator) {
 	accesscontrol.AddAlertingScopeRemovalMigration(mg)
 
 	accesscontrol.AddManagedFolderAlertingSilencesActionsMigrator(mg)
+
+	ualert.AddRecordingRuleColumns(mg)
 }
 
 func addStarMigrations(mg *Migrator) {

pkg/services/sqlstore/migrations/ualert/recording_rules_mig.go

@@ -0,0 +1,18 @@
+package ualert
+
+import "github.com/grafana/grafana/pkg/services/sqlstore/migrator"
+
+// AddRecordingRuleColumns adds columns to alert_rule to represent recording rules.
+func AddRecordingRuleColumns(mg *migrator.Migrator) {
+	mg.AddMigration("add record column to alert_rule table", migrator.NewAddColumnMigration(migrator.Table{Name: "alert_rule"}, &migrator.Column{
+		Name:     "record",
+		Type:     migrator.DB_Text, // Text, to allow for future growth, as this contains a JSON-ified struct.
+		Nullable: true,
+	}))
+
+	mg.AddMigration("add record column to alert_rule_version table", migrator.NewAddColumnMigration(migrator.Table{Name: "alert_rule_version"}, &migrator.Column{
+		Name:     "record",
+		Type:     migrator.DB_Text,
+		Nullable: true,
+	}))
+}