Reapply "Merge branch 'canary' into kucherenko/canary"

This reverts commit e6cb6454db.

apps/monitoring/database/cleanup.go

@@ -0,0 +1,52 @@
+package database
+
+import (
+	"database/sql"
+	"log"
+	"time"
+
+	"github.com/robfig/cron/v3"
+)
+
+// CleanupMetrics deletes metrics older than the retention period
+func CleanupMetrics(db *sql.DB, retentionDays int) error {
+	cutoffDate := time.Now().AddDate(0, 0, -retentionDays)
+	cutoffDateStr := cutoffDate.UTC().Format(time.RFC3339Nano)
+
+	containerQuery := `DELETE FROM container_metrics WHERE timestamp < ?`
+	_, err := db.Exec(containerQuery, cutoffDateStr)
+	if err != nil {
+		return err
+	}
+
+	serverQuery := `DELETE FROM server_metrics WHERE timestamp < ?`
+	_, err = db.Exec(serverQuery, cutoffDateStr)
+	if err != nil {
+		return err
+	}
+
+	log.Printf("Metrics deleted (older than %d days)", retentionDays)
+	log.Printf("Cutoff date for both tables: %s", cutoffDateStr)
+	return nil
+}
+
+// StartMetricsCleanup starts a cron job to periodically clean up metrics
+func StartMetricsCleanup(db *sql.DB, retentionDays int, cronExpression string) (*cron.Cron, error) {
+	c := cron.New()
+
+	_, err := c.AddFunc(cronExpression, func() {
+		if err := CleanupMetrics(db, retentionDays); err != nil {
+			log.Printf("Error during metrics cleanup: %v", err)
+		}
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	c.Start()
+	log.Printf("Started metrics cleanup job (retention: %d days, cron: %s)",
+		retentionDays, cronExpression)
+
+	return c, nil
+}