fix: make log alert delivery durable

internal/models/query.go

@@ -23,6 +23,9 @@ func InitData(db *gorm.DB) error {
 	if db == nil {
 		return nil
 	}
+	if err := backfillDispatchOutboxIDs(db); err != nil {
+		return err
+	}
 	if err := seedDefaultSyslogRules(db); err != nil {
 		return err
 	}
@@ -35,6 +38,52 @@ func InitData(db *gorm.DB) error {
 	return nil
 }
 
+func backfillDispatchOutboxIDs(db *gorm.DB) error {
+	const postgresUpdate = `
+WITH latest AS (
+    SELECT target_event.id AS log_event_id, current_outbox.id, current_outbox.status
+    FROM logs_events AS target_event
+    JOIN LATERAL (
+        SELECT id, status
+        FROM logs_alert_outbox
+        WHERE log_event_id = target_event.id
+        ORDER BY id DESC
+        LIMIT 1
+    ) AS current_outbox ON TRUE
+    WHERE target_event.dispatch_outbox_id = 0
+)
+UPDATE logs_events AS target_event
+SET dispatch_outbox_id = latest.id,
+    dispatch_status = CASE latest.status WHEN 'processing' THEN 'retrying' ELSE latest.status END,
+    alert_sent = CASE WHEN latest.status = 'sent' THEN TRUE ELSE FALSE END
+FROM latest
+WHERE target_event.id = latest.log_event_id
+  AND target_event.dispatch_outbox_id = 0`
+	const mysqlUpdate = `
+UPDATE logs_events AS target_event
+JOIN (
+    SELECT candidate.id AS log_event_id, MAX(outbox.id) AS id
+    FROM logs_events AS candidate
+    JOIN logs_alert_outbox AS outbox ON outbox.log_event_id = candidate.id
+    WHERE candidate.dispatch_outbox_id = 0
+    GROUP BY candidate.id
+) AS latest_id ON latest_id.log_event_id = target_event.id
+JOIN logs_alert_outbox AS latest ON latest.id = latest_id.id
+SET dispatch_outbox_id = latest.id,
+    dispatch_status = CASE latest.status WHEN 'processing' THEN 'retrying' ELSE latest.status END,
+    alert_sent = CASE WHEN latest.status = 'sent' THEN TRUE ELSE FALSE END
+WHERE target_event.dispatch_outbox_id = 0`
+
+	switch db.Dialector.Name() {
+	case "postgres":
+		return db.Exec(postgresUpdate).Error
+	case "mysql":
+		return db.Exec(mysqlUpdate).Error
+	default:
+		return gorm.ErrUnsupportedDriver
+	}
+}
+
 func seedDefaultSyslogRules(db *gorm.DB) error {
 	var cnt int64
 	if err := db.Model(&SyslogRule{}).Count(&cnt).Error; err != nil {