Alerting: Add compressed protobuf-based alert state storage (#99193)

pkg/services/sqlstore/migrations/migrations.go

@@ -143,4 +143,6 @@ func (oss *OSSMigrations) AddMigration(mg *Migrator) {
 	accesscontrol.AddReceiverCreateScopeMigration(mg)
 
 	ualert.AddAlertRuleUpdatedByMigration(mg)
+
+	ualert.AddAlertRuleStateTable(mg)
 }

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

@@ -0,0 +1,29 @@
+package ualert
+
+import "github.com/grafana/grafana/pkg/services/sqlstore/migrator"
+
+// AddAlertRuleStateTable adds column to store alert rule state data.
+func AddAlertRuleStateTable(mg *migrator.Migrator) {
+	alertStateTable := migrator.Table{
+		Name: "alert_rule_state",
+		Columns: []*migrator.Column{
+			{Name: "id", Type: migrator.DB_BigInt, IsPrimaryKey: true, IsAutoIncrement: true},
+			{Name: "org_id", Type: migrator.DB_BigInt, Nullable: false},
+			{Name: "rule_uid", Type: migrator.DB_NVarchar, Length: UIDMaxLength, Nullable: false},
+			{Name: "data", Type: migrator.DB_LongBlob, Nullable: false},
+			{Name: "updated_at", Type: migrator.DB_DateTime, Nullable: false},
+		},
+		Indices: []*migrator.Index{
+			{Cols: []string{"org_id", "rule_uid"}, Type: migrator.UniqueIndex},
+		},
+	}
+
+	mg.AddMigration(
+		"add alert_rule_state table",
+		migrator.NewAddTableMigration(alertStateTable),
+	)
+	mg.AddMigration(
+		"add index to alert_rule_state on org_id and rule_uid columns",
+		migrator.NewAddIndexMigration(alertStateTable, alertStateTable.Indices[0]),
+	)
+}