Revert "Alerting: Write and Delete multiple alert instances. (#54072)" (#54885)

This reverts commit 5e4fd94413.

pkg/services/ngalert/models/instance.go

@@ -7,8 +7,10 @@ import (
 
 // AlertInstance represents a single alert instance.
 type AlertInstance struct {
-	AlertInstanceKey  `xorm:"extends"`
+	RuleOrgID         int64  `xorm:"rule_org_id"`
+	RuleUID           string `xorm:"rule_uid"`
 	Labels            InstanceLabels
+	LabelsHash        string
 	CurrentState      InstanceStateType
 	CurrentReason     string
 	CurrentStateSince time.Time
@@ -16,12 +18,6 @@ type AlertInstance struct {
 	LastEvalTime      time.Time
 }
 
-type AlertInstanceKey struct {
-	RuleOrgID  int64  `xorm:"rule_org_id"`
-	RuleUID    string `xorm:"rule_uid"`
-	LabelsHash string
-}
-
 // InstanceStateType is an enum for instance states.
 type InstanceStateType string
 
@@ -48,6 +44,18 @@ func (i InstanceStateType) IsValid() bool {
 		i == InstanceStateError
 }
 
+// SaveAlertInstanceCommand is the query for saving a new alert instance.
+type SaveAlertInstanceCommand struct {
+	RuleOrgID         int64
+	RuleUID           string
+	Labels            InstanceLabels
+	State             InstanceStateType
+	StateReason       string
+	LastEvalTime      time.Time
+	CurrentStateSince time.Time
+	CurrentStateEnd   time.Time
+}
+
 // GetAlertInstanceQuery is the query for retrieving/deleting an alert definition by ID.
 // nolint:unused
 type GetAlertInstanceQuery struct {
@@ -70,7 +78,11 @@ type ListAlertInstancesQuery struct {
 
 // ValidateAlertInstance validates that the alert instance contains an alert rule id,
 // and state.
-func ValidateAlertInstance(alertInstance AlertInstance) error {
+func ValidateAlertInstance(alertInstance *AlertInstance) error {
+	if alertInstance == nil {
+		return fmt.Errorf("alert instance is invalid because it is nil")
+	}
+
 	if alertInstance.RuleOrgID == 0 {
 		return fmt.Errorf("alert instance is invalid due to missing alert rule organisation")
 	}